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Appendix J.3 - Master Hydrology ReportCORAL MOUNTAIN RESORT DRAFT EIR SCH# 2021020310 TECHNICAL APPENDICES Master Hydrology Report Appendix 3.3 June 2021 LII MASTER PLAN HYDROLOGY REPORT For Property Located In A Portion of Sections 27 & 28, Township 6 South, Range 7 East, SBM La Quinta, California CORAL MOUNTAIN RESORT Specific Plan January, 2021 Prepared for: CM Wave Development, L.L.C. 2440 Junction Place, Suite 200 Boulder, CO 80301 JN: 2553 MSA CONSULTING, INC.0 > PLANNING > CIVIL ENGINEERING LAND SURVEYING 342006ob Hope Drive, Rancho Mirage, CA 922'10 7603209811 mSaConsultinglnC.Com > PLANNING > CIVIL ENGINEERING > LAND SURVEYING Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com MASTER PLAN HYDROLOGY REPORT For Property Located In A Portion of Sections 27 & 28, Township 6 South, Range 7 East, SBM La Quinta, California CORAL MOUNTAIN RESORT Specific Plan January, 2021 Prepared for: CM Wave Development, L.L.C. 2440 Junction Place, Suite 200 Boulder, CO 80301 JN: 2553 MSA CONSULTING, INC.0 > PLANNING > CIVIL ENGINEERING LAND SURVEYING 342006ob Hope Drive, Rancho Mirage, CA 922'10 7603209811 mSaConsultinglnC.Com > PLANNING > CIVIL ENGINEERING > LAND SURVEYING Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com Coral Mountain Master Plan Hydrology Report TABLE OF CONTENTS PROJECT DESCRIPTION & LOCATION 1 EXISTING SITE CONDITIONS 1 Flood Rate Map 1 Existing Topography 1 PROPOSED FLOOD CONTROL REQUIREMENTS 1 HYDROLOGY ANALYSIS DESIGN CRITERIA 1 Hydrologic Soil Group 1 Antecedent Moisture Condition 2 Land Use Classifications and Runoff Index Numbers 2 Precipitation Frequency Estimates 2 Site Infiltration 2 Proposed Land Use Summaries 3 SUMMARY of SYNTHETIC UNIT (SHORTCUT METHOD) ANALYSES 3 Drainage Area 'A' 3 Drainage Area 'B' 3 Drainage Areas 'C' & 'F' 3 Drainage Area 'D' 3 Drainage Area 'E' 3 Drainage Area 'G' 3 Drainage Area 'H' 4 Drainage Area 'I' 4 Drainage Area 'Off -Site North' 4 Drainage Area 'Off -Site South' 4 PRELIMINARY WQMP ANALYSES 4 RESULTS AND CONCLUSIONS 4 LIST OF APPENDICES A. RIVERSIDE COUNTY TLMA VICINITY MAP B. NFIP FLOOD INSURANCE RATE MAP C. USDA NCSS HYDROLOGIC SOILS MAP D. NOAA ATLAS 14 & RCFCD REFERENCE PLATES E. LAND USE WORKSHEETS F. RCFCD SYNTHETIC UNIT HYDROGRAPH WORKSHEETS G. RIVERSIDE COUNTY WHITEWATER RIVER REGION WQMP WORKSHEETS H. HYDROLOGY EXHIBITS Coral Mountain Master Plan Hydrology Report PROJECT DESCRIPTION & LOCATION The project is proposed to consist of residential structures, a multi -story hotel complex, a wave lagoon and various outdoor amenities. The project site comprises approximately 377 acres with an additional 75 acres of offsite tributary area. The subject property is located on the southwest corner of Avenue 58 and Madison Street in the City of La Quinta and is situated in a portion of Sections 27 & 28, Township 6 South, Range 7 East, SBM. Existing dikes 2 & 4 along with the Coral Mountains border the property to the west and south. A vicinity map obtained from the Riverside TLMA website is included as Appendix A. EXISTING SITE CONDITIONS Flood Rate Map The proposed area is covered by FIRM Panel Number 06065C2900G, effective date of August 28, 2008, which indicates the subject property lies within Zone X (Shaded), defined as "Areas of 0.2% annual chance flood; areas of 1% annual chance flood with average depths of less than 1 foot or with drainage areas less than 1 square mile; and areas protected by levees from 1% annual chance flood. Insurance purchase is not required in these areas." Refer to the attached NFIP Flood Insurance Rate Map in Appendix B. Existing Topography The property is generally vacant and undeveloped with CVWD irrigation mains, numerous dirt road and hiking trails. Various desert vegetation is found throughout the site. The site is bounded to the east by Madison Street, to the north by 58th Avenue, existing levees and the Coral Mountains to the west and south, and 60th Avenue to the south. Groundwater was encountered at a depth of 47 feet for two of the borings. Site drainage appears to be controlled via sheet flow and surface infiltration generally from west to east. PROPOSED FLOOD CONTROL REQUIREMENTS The purpose of this report is to provide master plan basin analyses for the subject property. The drainage requirements for this project fall under the jurisdiction of the City of La Quinta. Storm flows are conveyed through the site via street flow to localized low points. All proposed pad elevations are set a minimum of 1 - foot above the high -side street elevation. HYDROLOGY ANALYSIS DESIGN CRITERIA Storm runoff volumes for the 100 -year event were obtained utilizing the Synthetic Unit Hydrograph as described in the RCFC&WCD Hydrology Manual. The hydrologic data used for the calculations are as follows: Hydrologic Soil Group The existing soil is categorized primarily as hydrologic soil groups "A" and "B" for the majority of the subject property with soil group "D" being assigned to the Coral Mountain rock out -cropping as shown per the attached National Cooperative Soil Survey exhibits in Appendix C. For the purposes of this report, Soil Group 'B' was assigned to the analyses with the exception of the rock out -cropping. Soil Group 'B' is defined by RCFCD as — "soils having moderate infiltration rates when thoroughly wetted and consisting chiefly of moderately deep to deep, moderately well to well drained soils with moderately fine to moderately coarse textures. These soils have a moderate rate of water transmission". Soil Group 'D' is defined by RCFCD as — "soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high- water table, soils that have a claypan or clay layer at or near the surface and soils that are shallow over nearly impervious material". 1 Coral Mountain Master Plan Hydrology Report Antecedent Moisture Condition AMC II — Moderate runoff potential, an intermediate condition. Per RCFC & WCD Hydrology Manual (Dated: April 1978): "For the purposes of design hydrology using District methods, AMC II should normally be assumed for both the 10 -year and 100 -year frequency storm". Land Use Classifications and Runoff Index Numbers Runoff Index Numbers were obtained from RCFCD Plates E6.1, E6.2 and E6.3 are summarized below: Commercial or Residential Landscaping (Soil Group B) 56 Rock Out -cropping (Soil Group D) 93 Existing Open Brush — Poor 76 Percent of Impervious Cover (RCFCD Plate E-6.3): Rock Out -cropping 5% Existing Open Brush — Poor Condition 5% Impervious Areas (Buildings, Pavement, Hardscape) 100% Water Features 100% Commercial Areas 90% SFR — Low Density 30% SFR — Medium Density 40% SFR — High Density 50% Open Space (Landscaping & Retention Basins) 10% Low Loss Rates: 85% Precipitation Frequency Estimates Precipitation depths were obtained from NOAA Atlas 14: 2 Year - 1 Hour Precipitation: 10 Year —1 Hour Precipitation: 10 Year —3 Hour Precipitation: 10 Year — 6 Hour Precipitation: 10 Year — 24 Hour Precipitation: 100 Year — 1 Hour Precipitation: 100 Year — 3 Hour Precipitation: 100 Year - 6 Hour Precipitation 100 Year — 24 Hour Precipitation 0.358 inches 0.711 inches 1.06 inches 1.36 inches 2.23 inches 1.44 inches 2.14 inches 2.76 inches 4.41 inches Slope of Intensity Duration Curve: 0.52 See Appendix D for the NOAA Atlas 14 Point Precipitation Frequency Estimates and respective RCFCD Plates. Site Infiltration No percolation tests have been performed at the current time, therefore, for the purposes of this report a design percolation rate of 1 in/hr was used in the basin sizing calculations. Prior to the final design submittal, percolation tests will be performed, and should the 1 inch/hour rate not be achieved, Maxwell drywells will be proposed to de -water the basins within the required time period as specified by Riverside County BMP requirements. 2 Coral Mountain Master Plan Hydrology Report Proposed Land Use Summaries Land uses for each of the drainage areas were analyzed based on the preliminary site plan. In addition, a reconciliation was performed to verify the hydrologic boundary corresponds to the existing property boundary accounting for any differences. Land use worksheets are included in Appendix E. SUMMARY of SYNTHETIC UNIT (SHORTCUT METHOD) ANALYSES The proposed retention basins for the associated drainage areas were sized to retain the 100 -year controlling storm event flood volumes and were analyzed utilizing the RCFCD Synthetic Unit (Shortcut Method). Per the manual, for areas of less than 100 — 200 acres, and lag times less than 7 — 8 minutes, the shortcut method is applicable. This method assumes that in a small watershed, response time to effective rainfall is very short. Therefore, runoff rates for a given period of time can be assumed to be directly proportional to effective rain. This method yields only approximate results (on the conservative side) and should be used only for watersheds meeting the criteria noted above. It should be noted that the peak flow for the 1 -hour storm is not necessarily representative for peak flow. Per RCFCD, peak discharges from the 3 -hour storm should normally compare well with rational peaks. The synthetic unit worksheets are included in Appendix F and are summarized on sheets 1 and 2 of the hydrology exhibits in Appendix H. Drainage Area 'A' This area is located on the westerly portion of the project and consists primarily of Dike Number 2, the Coral Mountains, a portion of Dike Number 4, the south-westerly portion of Planning Area IX and Planning Area X. Storm runoff (approximately 18.4 acre-feet) from this drainage sub -area is directed to the wave lagoon which provides over 69 acre-feet of retention. Shallow basins are proposed to retain 10 -year storm flows from drainage areas 'Al' & 'A3'. During the final design process, once a more detailed land plan is provided, first flush storm flows from drainage area `A2' will be captured and conveyed to an underground storage area prior to being discharged into the lagoon. Drainage Area 'B' Storm runoff of 4.2 acre-feet from this drainage area will be retained within the proposed lake, which provides storage of approximately 6.7 acre-feet. Drainage Areas 'C' & 'F' Storm runoff from these drainage areas will be conveyed to and retained in a retention basin located in Drainage Area 'F'. Drainage Area 'F' is a future low density planning area. The total flood volume is 4.8 acre- feet with 5.1 acre-feet of storage provided. Drainage Area 'D' Storm runoff of approximately 3.1 acre-feet for this drainage area will be conveyed to and retained in the proposed lake located within the "Farm". The lake provides approximately 3.8 acre-feet of storage. Drainage Area 'E' Storm runoff of approximately 5.7 acre-feet for this drainage area will be conveyed to and retained in a large basin located in along the southerly portion of Planning Area VIII (Area 5). The basin provides storage of roughly 27.9 acre-feet. This basin will also provide a discharge location for the lagoon. Drainage Area 'G' This area is a future low-density residential development. Flood volume of 3.2 acre feet will be retained in a retention basin providing 3.4 acre-feet of storage. 3 Coral Mountain Master Plan Hydrology Report Drainage Area 'H' This area is a future commercial development. Flood volume of 1.1 acre-feet will be contained in two retention basins providing 1.4 acre-feet of storage. Drainage Area 'I' This area is a future low-density residential development. Once developed it is anticipated approximately 4.7 acre-feet of retention will be required, which will be contained in a retention basin providing 5.4 acre-feet of storage. Drainage Area 'Off -Site North' This area consists of the south half of Avenue 58 and the northerly west half of Madison Street. The storm flows are captured by an existing catch basin and discharged into an existing basin which will remain when Drainage Area '1' is developed. The existing basin provides 2.9 acre-feet of storage to contain the 1.3 acre-feet of flood volume. Drainage Area 'Off -Site South' This area consists of the north half of Avenue 60 and the southerly west half of Madison Street. The storm flows are captured by an existing catch basin and discharged into an existing basin which will remain when Drainage Area 'E' is developed. The existing basin provides 5.0 acre-feet of storage to contain the 0.9 acre- feet of flood volume. PRELIMINARY WQMP ANALYSES Preliminary design volume and flow for BMP measures were based on Worksheets 1 and 2 from the Riverside County — Whitewater River Region Water Quality Management Plan. Impervious area for the drainage sub- areas are derived from the preliminary land use worksheets. A summary of the BMP results is presented on sheet 1 of the Hydrology Exhibits in Appendix H with the worksheets being included as Appendix G. RESULTS AND CONCLUSIONS As the above narrative and appendices confirm, the proposed retention basins are sufficiently sized to contain the flood volume from the controlling 100 -year storm. During the final design process, a more detailed hydrologic report will be submitted to the City for review and approval. 4 Coral Mountain Master Plan Hydrology Report Appendix A Riverside County TLMA Vicinity Map Coral Mountain Master Plan Hydrology Report Appendix B NFIP Flood Insurance Rate Map SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT Regulatory Floodway 0‹ oa J0 a W N 2a V)2 0.2% Annual Chance Flood Hazard, Areas I of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile zone X Future Conditions 1% Annual Chance Flood Hazard zone x 'W a Area with Reduced Flood Risk due to Levee. See Notes. zone x rAl Area with Flood Risk due to Levee Zone o WO OCC N ‹N 2 ao WO xLL 1-0 0 Area of Minimal Flood Hazard OTHER AREAS Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall J 2 2 W0 W U 02 - Profile Baseline Hydrographic Feature Digital Data Available No Digital Data Available MAP PANELS 116° 14'40.70"W 33°3619.61"N N N 2 33°36'49.57"N O O LO O O O SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT 33°37'35.63"N Regulatory Floodway O < oawJ 0 0< aQ Om (0 N WQ xx Q Q CC o xL 0 0 N 'O R x To et' O LL £ C OJ g • i R Q `w 0 K U 0 Area of Undetermined Flood Hazard Zone D OTHER AREAS Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall J c/) CC CC Wm W U CC Hydrographic Feature z Digital Data Available No Digital Data Available MAP PANELS 0 116°14'39.62"W 33°37'5.67"N M„L0'LL,9L09LL O O O O 10 N O SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT 33°37'53.05"N Q Regulatory Floodway W oa J a� W N as )nx 0.2% Annual Chance Flood Hazard, Areas I of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile zone X Future Conditions 1% Annual Chance Flood Hazard zone x 'W a Area with Reduced Flood Risk due to Levee. See Notes. zone x rAl Area with Flood Risk due to Levee Zone o U. 0a' N LU a CO < 0 W o xLL 0 0 Area of Minimal Flood Hazard D OTHER AREAS Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall - Profile Baseline Hydrographic Feature Digital Data Available No Digital Data Available MAP PANELS 116°14'40.22"W 33°37'23.10"N 0 0 0 0 0 0 0 0 N 0 ce LL o a © I Q MHB �7 51 LE 11O LJu 51 LI U tn tng 0 - .-'7%.. • Y .i. TTT 411 i' w EE 0 CO M 0. *•,N.•TTT ♦. W 0 N L() LL 0 0 0 DEFINITIONS OF FEMA FLOOD ZONE DESIGNATIONS Moderate to Low Risk Areas In communities that participate in the NFIP, flood insurance is available to all property owners and renters in these zones: ZONE DESCRIPTION X (Shaded) Areas of 0.2% annual chance flood; areas of 1% annual chance flood with average depths of less than 1 foot or with drainage areas less than 1 square mile; and areas protected by levees from 1% annual chance flood. Insurance purchase is not required in these zones. X Areas determined to be outside the 0.2% annual chance floodplain. High Risk Areas In communities that participate in the NFIP, mandatory flood insurance purchase requirements apply to all of these zones: ZONE DESCRIPTION A Areas with a 1% annual chance of flooding and a 26% chance of flooding over the life of a 30 -year mortgage. Because detailed analyses are not performed for such areas; no depths or base flood elevations are shown within these zones. AE Areas with a 1% annual chance of flooding and a 26% chance of flooding over the life of a 30 -year mortgage. In most instances, base flood elevations derived from detailed analyses are shown at selected intervals within these zones. AH Areas with a 1% annual chance of shallow flooding, usually in the form of a pond, with an average depth ranging from 1 to 3 feet. These areas have a 26% chance of flooding over the life of a 30 -year mortgage. Base flood elevations derived from detailed analyses are shown at selected intervals within these zones. AO River or stream flood hazard areas, and areas with a 1% or greater chance of shallow flooding each year, usually in the form of sheet flow, with an average depth ranging from 1 to 3 feet. These areas have a 26% chance of flooding over the life of a 30 -year mortgage. Average flood depths derived from detailed analyses are shown within these zones. For areas of alluvial fan flooding, velocities are also determined. AR Areas with a temporarily increased flood risk due to the building or restoration of a flood control system (such as a levee or a dam). Mandatory flood insurance purchase requirements will apply, but rates will not exceed the rates for unnumbered A zones if the structure is built or restored in compliance with Zone AR floodplain management regulations. A99 Areas with a 1% annual chance of flooding that will be protected by a Federal flood control system where construction has reached specified legal requirements. No depths or base flood elevations are shown within these zones. High Risk — Coastal Areas In communities that participate in the NFIP, mandatory flood insurance purchase requirements apply to all of these zones: ZONE DESCRIPTION V Coastal areas with a 1`)/0 or greater chance of flooding and an additional hazard associated with storm waves. These areas have a 26% chance of flooding over the life of a 30 -year mortgage. No base flood elevations are shown within these zones. VE Coastal areas with a 1`)/0 or greater chance of flooding and an additional hazard associated with storm waves. These areas have a 26% chance of flooding over the life of a 30 -year mortgage. Base flood elevations derived from detailed analyses are shown at selected intervals within these zones. Undetermined Risk Areas ZONE DESCRIPTION D Areas with possible but undetermined flood hazards. No flood hazard analysis has been conducted. Flood insurance rates are commensurate with the uncertainty of the flood risk. Coral Mountain Master Plan Hydrology Report Appendix C USDA NCSS Hydrologic Soils Map 33° 37'56"N 33° 36' 28" N 8 O) — r 568100 Hydrologic Soil Group—Riverside County, Coachella Valley Area, California (THE WAVE) 568400 568700 569060 `; • e r;.� Niti ENF 69300 569600 569900 A 1. no- Soil Map may not be valid at this scale. 1 1 1 1 568100 568400 568700 569000 569360 569660 569960 Map Scale: 1:13,200 if printed on A portrait (8.5" x 11") sheet. N Meters 0 150 300 600 900 0 500 1000 2000 3000Feet Map projection: Web Mercator Comer coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 8 8 8 a 9/18/2019 Page 1 of 4 33° 37 56" N 33° 36' 28" N 0 E .o0 0 0 0 Ts O (o a) L U (0 O U jj W U= CD a) 0 0 0 0 0) U 0) 0 0 a 2 MAP INFORMATION MAP LEGEND O a a) 01 E 0) a) 0 0 O a) N co. E roO U .L. > O 'o '5 c y o c Warning: Soil Map may not be valid at this scale. a a) 'oa) V) (I' '@ co O D OUO y i) U ? EO) U a) a) 0. as@ co coc E m ° O O C.LL O D_ 0 To aO o U as L o E y Q L-' O 0 > o o > a co L 0 CO O y E a O O L E N oa0as 00 a> 4j> E � E O U a> -a n m 14 ai 0 c - c O W E_ U ai o U (0 0 o U ❑ Not rated or not available ❑ ❑ 0 0 Soil Rating Polygons c m 0 m0 = co m a) N O co O O m co w :o E m as 0) 0) 0)) a a 3c 0 0. U U O Q N O co 0 C ci co O Q y y tco o co >a) a w a Q — O N 0 00 > a o > O M 'O as 0 LO w 0 f0 d) a (n al U coE L y • L L (O7 @ N Ce CO 0 0 y .LCD O„ .: C L O t/) N (7 O Z L N Z U O N V E N A a c ca °�� m Q o N 3 0 o �> co �j w �mEOE U @ c L2E L (0 D O a N 0 w a O N p N Q L a7 o U @ C O m 7 In N 0) a= >6 O O U >' O V `� O U O co O E Z. co E 0 2 Z a 0 0 al p To Q O .y0.. Q N E to 3 J O a 0 cll f0 N > > O Oa-.+ 0 Q @ Q O C O y co co O O N_ O L L U O Z ct E >O a ai al a) .O. al O 0 `� a •C L.. >.. > L f0 aI co a) f0 (0 cu E 0 a) ' O 00 0 m 3 (0 y 3 co y o Q w o o a Q 0 >E ��� E @ �•L 0 ama E I-2 Ooo o0OmO 00 Q ao m tc o w v L m > 0 > OQ r �rn 0 0 U '0 U C a O O O O O N O Q 0 0. 0 0 a) V y (n ° 0 :: N N E foo .� a E i Hydrologic Soil Group—Riverside County, Coachella Valley Area, California THE WAVE Hydrologic Soil Group USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 9/18/2019 Page 3 of 4 Map unit symbol Map unit name Rating Acres in AOI Percent of AOI CdC Carsitas gravelly sand, 0 to 9 percent slopes A 50.9 6.9% CpA Coachella fine sand, 0 to 2 percent slopes A 50.2 6.8% CsA Coachella fine sandy loam, 0 to 2 percent slopes A 46.2 6.3% GaB Gilman loamy fine sand, 0 to 5 percent slopes B 23.4 3.2% GbA Gilman fine sandy loam, 0 to 2 percent slopes B 78.0 10.6% GbB Gilman fine sandy loam, 2 to 5 percent slopes B 10.7 1.5% GcA Gilman fine sandy loam, wet, 0 to 2 percent slopes B 89.1 12.1% GfA Gilman silt loam, wet, 0 to 2 percent slopes B 0.0 0.0% Ip Indio fine sandy loam B 40.7 5.5% Ir Indio fine sandy loam, wet B 70.9 9.6% Is Indio very fine sandy loam B 46.3 6.3% It Indio very fine sandy loam, wet B 127.7 17.3% MaB Myoma fine sand, 0 to 5 percent slopes A 55.0 7.4% RO Rock outcrop 49.8 6.7% Totals for Area of Interest 739.0 100.0% USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 9/18/2019 Page 3 of 4 Hydrologic Soil Group—Riverside County, Coachella Valley Area, California THE WAVE Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff. None Specified Tie-break Rule: Higher USDA Natural Resources Web Soil Survey 9/18/2019 Conservation Service National Cooperative Soil Survey Page 4 of 4 Coral Mountain Master Plan Hydrology Report Appendix D NOAA Atlas 14 RCFCD Reference Plates 9/18/2019 Precipitation Frequency Data Server NOAA Atlas 14, Volume 6, Version 2 Location name: La Quinta, California, USA* Latitude: 33.6202°, Longitude: -116.2562° Elevation: -31.22 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey Bonnin, Daniel Brewer, Li -Chuan Chen, Tye Parzybok, John Yarchoan NOAA, National Weather Service, Silver Spring, Maryland PF tabular 1 PF graphical 1 Maps & aerials PF tabular PDS -based point precipitation frequency estimates with 90% confidence intervals (in inches)" Average recurrence interval (years) Duration 1 2 5 10 25 50 100 200 500 1000 5 -min 0.066 (0.056-0.080) 0.103 (0.086-0.124) 0.156 (0.130-0.189) 0.203 (0.168-0.249) 0.277 (0.221-0.350) 0.340 (0.265-0.440) 0.412 (0.313-0.547) 0.494 (0.365-0.675) 0.622 (0.440-0.887) 0.737 (0.504-1.09) 10 -min 0.095 (0.080-0.115) 0.147 (0.123-0.178) 0.223 (0.186-0.271) 0.292 (0.241-0.357) 0.397 (0.316-0.502) 0.488 (0.380-0.631) 0.590 (0.449-0.783) 0.708 (0.524-0.967) 0.891 (0.631-1.27) 1.06 (0.722-1.56) 15 -min 0.115 (0.096-0.139) 0.178 (0.148-0.215) 0.270 (0.225-0.327) 0.353 (0.291-0.432) 0.480 (0.382-0.607) 0.590 (0.460-0.763) 0.714 (0.543-0.947) 0.856 (0.633-1.17) 1.08 (0.763-1.54) 1.28 (0.873-1.89) 30 -min 0.165 (0.138-0.200) 0.255 (0.213-0.309) 0.387 (0.322-0.470) 0.506 (0.418-0.619) 0.688 (0.549-0.872) 0.846 (0.660-1.10) 1.02 (0.780-1.36) 1.23 (0.909-1.68) 1.55 (1.10-2.21) 1.83 (1.25-2.71) 60 -min 0.232 (0.194-0.280) 0.358 (0.299-0.433) 0.543 (0.452-0.660) 0.711 (0.586-0.870) 0.966 (0.771-1.22) 1.19 (0.927-1.54)I 1.44 (1.10-1.91) 1 1.73 (1.28-2.36) 2.17 (1.54-3.10) 2.57 (1.76-3.80) 2 -hr 0.322 (0.269-0.389) 0.473 (0.395-0.572) 0.698 (0.581-0.848) 0.906 (0.747-1.11) 1.23 (0.979-1.56) 1.51 (1.18-1.95) 1.83 1 (1.39-2.43) 2.20 (1.63-3.01) 2.77 (1.96-3.95) 3.28 (2.24-4.85) 3 -hr 0.388 (0.324-0.468) 0.559 (0.467-0.676) 0.818 (0.681-0.993) 1.06 (0.873-1.30) 1.43 (1.14-1.82) 1.76 (1.38-2.28) 2.14 (1.63-2.84) 2.58 (1.91-3.53) 3.26 (2.31-4.65) 3.87 (2.65-5.72) 6 -hr 0.508 (0.425-0.614) 0.726 (0.606-0.879) 1.06 (0.880-1.28) 1.36 (1.13-1.67) 1.84 (1.47-2.34) 2.27 (1.77-2.94) 2.76 I (2.10-3.66) 3.32 (2.46-4.54) 4.21 I (2.98-6.00) I 5.00 (3.42-7.38) 12 -hr 0.610 (0.509-0.737) 0.893 (0.745-1.08) 1.32 (1.10-1.60) 1.70 (1.41-2.08) 2.30 (1.83-2.91) 2.82 (2.20-3.65) 3.42 (2.60-4.53) 4.10 (3.03-5.60) 5.14 I (3.64-7.33) 6.07 (4.15-8.96) 24 -hr 0.759 (0.671-0.875) 1.15 (1.01-1.33) 1.72 (1.51-1.99) 2.23 (1.95-2.60) 3.00 (2.54-3.62) 3.67 (3.05-4.51) 4.41 (3.58-5.55) 5.25 (4.15-6.79) 6.53 (4.95-8.77) 7.63 (5.60-10.6)1 2 -day 0.871 (0.771-1.00) 1.34 (1.18-1.54) 2.01 (1.77-2.33) 2.61 (2.28-3.05) 3.51 (2.97-4.22) 4.27 (3.54-5.24) 5.11 (4.14-6.42) 1 6.04 (4.77-7.81) 7.44 (5.65-10.0) 8.63 (6.34-12.0) 3 -day 0.936 (0.828-1.08) 1.44 (1.28-1.67) 2.18 (1.92-2.52) 2.83 (2.47-3.30) 3.79 (3.21-4.57) 4.61 (3.83-5.66) 5.50 (4.46-6.92) 6.50 (5.13-8.40) 7.98 (6.06-10.7) 9.24 (6.79-12.9) 4 -day 0.994 (0.880-1.15) 1.54 (1.36-1.77) 2.31 (2.04-2.68) 3.00 (2.63-3.50) 4.02 (3.41-4.85) 4.88 (4.06-6.00) 5.83 (4.73-7.33) 6.88 (5.43-8.89) 8.43 (6.40-11.3) 9.76 (7.16-13.6) 7 -day 1.06 (0.935-1.22) 1.63 (1.44-1.88) 2.45 (2.16-2.83) 3.17 (2.77-3.70) 4.24 (3.59-5.11) 5.14 (4.26-6.31) 6.12 (4.96-7.69) 7.20 (5.69-9.30) 8.81 (6.68-11.8) 10.2 (7.46-14.1) 10 -day 1.09 1.67 (0.961-1.25) (1.48-1.93) 2.52 3.26 4.36 5.28 6.28 7.38 9.01 (2.22-2.91) (2.85-3.80) (3.69-5.25) (4.38-6.48) (5.09-7.90) (5.83-9.54) (6.84-12.1) 10.4 (7.62-14.4) 20 -day 1.17 (1.03-1.35) 1.82 (1.61-2.10) 2.75 (2.42-3.18) 3.57 (3.12-4.17) 4.78 (4.05-5.76) 5.79 (4.81-7.12) 6.89 8.09 (5.59-8.66) (6.39-10.4) 9.83 (7.46-13.2) 11.3 (8.29-15.7) 30 -day 1.24 (1.10-1.43) 1.96 (1.73-2.26) 2.99 (2.63-3.46) 3.90 (3.41-4.55) 5.24 (4.44-6.31) 6.35 (5.27-7.81) 7.55 8.86 (6.12-9.50) (6.99-11.4) 10.7 (8.16-14.5) 12.3 (9.04-17.1) 45 -day 1.34 2.15 (1.19-1.55) (1.90-2.49) 3.32 4.35 5.88 7.14 8.49 9.96 12.1 (2.93-3.85) (3.81-5.08) (4.98-7.08) (5.93-8.77) (6.89-10.7) (7.87-12.9) (9.16-16.2) 13.8 (10.1-19.2) 60 -day 1.42 2.31 (1.26-1.64) (2.04-2.67) 3.60 4.73 6.40 7.78 9.27 10.9 13.2 (3.17-4.17) (4.14-5.52) (5.42-7.71) (6.46-9.56) (7.52-11.7) i (8.58-14.0) (9.98-17.7) i 15.0 (11.0-20.9) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. PF graphical https://hdsc. nws.noaa.gov/hdsc/pfds/pfds_printpage.html?Iat=33.6202&Ion=-116.2562&data=depth&units=english&series=pds J F u 0 z Z Z W Z; O LL Z N re 05 LL ZQ,n',�~� LLINO(0z_ w Z = N m w a w J 2 2 H a < z F F w w w LLJ 0 000 Z aaCC aio C LO O O co V 7 CO 7 7 N L d) 1n CO 0 7 T C V P] N N— O O LO O O O M CV (0 N = n ul J LL ; O J 2 Q F N W N CO N 0 co Ln N co V0 (0 co (O O V01 co r --in 4 W d CV (('1 r-- CO 01 O O L— N N M V V (0 (0 (0 (o I-- n r co co 01 W IX Z w— 0 0 0 0 0 2 0 re LL == J J_ y d 0 Q (0 W 47 Co N (O M N V (o O V W (0 O 1-- M o r N N O CO W¢ g W Z t o (0 Co V N O CO. I. O LC, V V M N N N T- O O O O m J Z ((D 0 w C C i N N N N6 >00 1z >I:t Et - F W W iAZ Z CO Z Q w ~ Ol0 Ol0 Ol0 Ol0 Ol0 Ol0 Ol0 Ol0 Ol0 OIA OIAO F V1 Z Z s-,- N N CO CO V V ((1 (0 (0 (o N- r N co W 01 0 0 N Z 0 d U w 0 ti 1 0 RUNOFF INDEX NUMBERS OF HYDROLOGIC SOIL-COVER COMPLEXES FOR PERVIOUS AREAS-AMC II Cover Type (3) Quality of Cover (2) Soil Group I A B C D NATURAL COVERS - Barren 78 86 91 93 (Rockland, eroded and graded land) Chaparrel, Broadleaf Poor 53 70 80 85 (Manzonita, ceanothus and scrub oak) Fair 40 63 75 81 Good 31 57 71 78 Chaparrel, Narrowleaf Poor 71 82 88 91 (Chamise and redshank) Fair 55 72 81 86 Grass, Annual or Perennial Poor 67 78 86 89 Fair 50 69 79 84 Good 38 61 74 80 Meadows or Cienegas Poor 63 77 85 88 (Areas with seasonally high water table, Fair 51 70 80 84 principal vegetation is sod forming grass) Good 30 58 72 78 Open Brush Poor 62 76 84 88 (Soft wood shrubs - buckwheat, sage, etc.) Fair 46 66 77 83 Good 41 63 75 81 Woodland Poor 45 66 77 83 (Coniferous or broadleaf trees predominate. Fair 36 60 73 79 Canopy density is at least 50 percent) Good 28 55 70 77 Woodland, Grass Poor 57 73 82 86 (Coniferous or broadleaf trees with canopy Fair 44 65 77 82 density from 20 to 50 percent) Good 33 58 72 79 URBAN COVERS - Residential or Commercial Landscaping Good 32 56 69 75 (Lawn, shrubs, etc.) Turf Poor 58 74 83 87 (Irrigated and mowed grass) Fair 44 65 77 82 Good 33 58 72 79 AGRICULTURAL COVERS - Fallow 76 85 90 92 (Land plowed but not tilled or seeded) R C F C 8 W C D RUNOFF INDEX NUMBERS HYDROLOGY MANUAL FOR PERVIOUS AREAS PLATE E -6.I (I of 2) RUNOFF INDEX NUMBERS OF HYDROLOGIC SOIL -COVER COMPLEXES FOR PERVIOUS AREAS -AMC II Cover Type (3) Quality of Cover (2) Soil Group A B C D AGRICULTURAL COVERS (cont.) - Legumes, Close Seeded Poor 66 77 85 89 (Alfalfa, sweetclover, timothy, etc.) Good 58 72 81 85 Orchards, Deciduous See Note 4 (Apples, apricots, pears, walnuts, etc.) Orchards, Evergreen Poor 57 73 82 86 (Citrus, avocados, etc.) Fair 44 65 77 82 Good 33 58 72 79 Pasture, Dryland Poor 67 78 86 89 (Annual grasses) Fair 50 69 79 84 Good 38 61 74 80 Pasture, Irrigated Poor 58 74 83 87 (Legumes and perennial grass) Fair 44 65 77 82 Good 33 58 72 79 Row Crops Poor 72 81 88 91 (Field crops - tomatoes, sugar beets, etc.) Good 67 78 85 89 Small Grain Poor 65 76 84 88 (Wheat, oats, barley, etc.) Good 63 75 83 87 Vineyard See Note 1 4 1 1 Notes: 1. All runoff index (RI) numbers are for Antecedent Moisture Condition (AMC) II. 2. Quality of cover definitions: Poor -Heavily grazed or regularly burned areas. Less than 50 per- cent of the ground surface is protected by plant cover or brush and tree canopy. Fair -Moderate cover with 50 percent to 75 percent of the ground sur- face protected. Good -Heavy or dense cover with more than 75 percent of the ground surface protected. 3. See Plate C-2 for a detailed description of cover types. 4. Use runoff index numbers based on ground cover type. See discussion under "Cover Type Descriptions" on Plate C-2. 5. Reference Bibliography item 17. R C F C 8 W C D RUNOFF INDEX NUMBERS HYDROLOGY MANUALFOR PERVIOUS AREAS PLATE E -6.I (2of 2) RiTATIMIC >M 6- o Z E O e '- o. 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F. (1 Acre) Lots 20,000 S. F. (1/2 Acre) Lots 7,200 - 10,000 S. F. Lots Multiple Family Residential: Condominiums Apartments Mobile Home Park Commercial, Downtown Business or Industrial 0 - 10 10-25 30 - 45 45 - 55 45 - 70 65 - 90 60 - 85 80 -100 0 20 40 50 65 80 75 90 Notes: 1. Land use should be based on ultimate development of the watershed. Long range master plans for the County and incorporated cities should be reviewed to insure reasonable land use assumptions. 2. Recommended values are based on average conditions which may not apply to a particular study area. The percentage impervious may vary greatly even on comparable sized lots due to differences in dwelling size, improvements, etc. Landscape practices should also be considered as it is common in some areas to use ornamental grav- els underlain by impervious plastic materials in place of lawns and shrubs. A field investigation of a study area should always be made, and a review of aerial photos, where available may assist in estimat- ing the percentage of impervious cover in developed areas. 3. For typical horse ranch subdivisions increase impervious area 5 per- cent over the values recommended in the table above. RCFC & WCD HYDROLOGY MANUAL IMPERVIOUS COVER FOR DEVELOPED AREAS PLATE E-6.3 Coral Mountain Master Plan Hydrology Report Appendix E Preliminary Land Use Worksheets J w V 0 M N N - N 0 m N a N n'00. 7 10 O V <') n• U) 4 n O M V V ❑ W l0 a O NfO N'0N7m00OmNOn n 0) ❑ N w 7 O 2 v(0 NON m)0 W N � a a O 0 x N Q OP OW0.2 2 ❑ a N w 2 ❑ W Q OP a Z O w K ❑ 0 w 2 ❑ J (D -Z/7.-00(....,-2000020000° '0 `6.-0,-0,1 V O� M n N 0 0 0 0 N 0 0 0 0 11 U 0 t0N.0000 0 0 0 N K co cd O N NV N O d d O N O d O N 0 0 O O N O O N 0 0 0 0 N O O O N .2000000000000000 11 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a' 0 o 0 4 0 o 4 o 0 0 o 4 o o e 4 J w Q 0 0 n o n o 0 o n n p P M d 0� 0 0 � 1O W 0 M 0 0 w a Z n .-o"''00 Nn000Cio00C. 7 0 W❑ 2 0 0 •N 0 0 v 100 V N 0 0)0000) ❑ a N z w J � W N J aQ _ C w W 10 ` 14) 0 0 0 0'1 0 0.- 0 0 0 0 0 0 a W w i1 u n 7 0 0 0 R 0 0.- 0 0 0 0 1 Q C m vi. - o a oV o o 1. o? o oet1; 0 O 6 g 0 w m M O M O N 0 0 0 O O O O O O W N` m N 0 N 0 a 0 0 0 0 a 0 0 0 a f f II V� V O M OV 0 0 0 0V 0 0 0� g W R 00 0 O N O N 0 0 0 O N O O e LL W N 0 W 0 1'1) W 0, u)) 0 0 N n N - w 4) a a W J II V O'0 7'0 1I M M 0 7 • n 9,-_.`1 N 3 K` N� 0 0 0 0 1n N a a N M O W 0 n N 0 m m O n N M N V W V m O n 0 0 M = 0 N M 7 O O N N M O O 0 M M N N m N N 00 W r O n U) N O O O O M O O O O M O O O M co N ` O O O O O O O O O O O m II O O O O O O O O N O O O N LL W Q' v M 0 0 0 0 M O O O O M O O O M a 0 H z 0 7 Z V Y a M H N 0 0 0 0 N O 0 0 0 N O 0 0 N w 0 0 O1 o 0 0 0. 0 0 0 0 . 0 0 0 m w V R g p O O O O M O O O O M O O O M z 1- co 0 a 1- N 7 4 a Q Q O J 4w O U- 0 M - M m W Q Wce O 2 ZQ m 0 _}}}>-mm f m U ix Z Q r co Eco ZZO Q ZZZmZZLL2 M70 WamInw Z OJ Qp H N NJ NNO.c1 Q 0 0 0 O w❑❑0❑0www z 4 m ? 0 0 w w 7 , 4IxQce ,0v404 'n #❑ Dm<to(oQ0000zz<Q01=00 0..1-w nD1-ILL~SW2.w��=a}O<1m 0 H-0 D O0 QA�2 LLi1OOKOO N, WJLLLL, ww.. IMa F WNW FF Ix 1-2Q0. g0OceQ2FFw F-02 0 Q6W000000coo a-, f230 HYDROLOGIC SOIL GROUP B N N 7 W 7, O - 2 7 M o O N M F ▪ W Q 0 c p 2'oM co a> Z • N Ce ap x W J NQ a m 0 0 0 a z N V o o o 0 ww R' m o cc;o o co ay w re i 0 W O .1 to UI O O O O O • Z N V 0 0 0 0 0 O w K` 0 0 0 0 0 ay w ce J 0 W J N Qco m00000 y a z IIS o 0 0 0 0 >OLuiTaO0000 0 a N Q W J � W N J as zQ w m`! 0 N O O N a W W II O LIE-) O O N Q C` O N O O N 0 W freco u'OOO o'Of W O` O O O o 2 F F II V 0 0 0• WK` 0 0 0- 0 fq ▪ Y N` o N— o m W J II - 0 0 0 0 0 `O N O O N >> x N Mo�oM I— re co `co II M O W O N LLW K o O V O �.�j CL 0 Z YUO am ielocoi° O a. II • O N O r V a' A M O 0 M W << _ZW Q < ca 0 0 TTM 37815 - CORAL MOUNTAIN HYDROLOGIC SOIL GROUP A \co )§§§§§¥77§$ §[)#eaeeae7,-§ \ El; co (}}\jk)§I-. ": !)gif§$k§M8 $8s42 . \7wem=w2,,,m■m,�o kK [W(§!a%1R§4a00oom§ ±§`—=oc'r- 000.00.. ZI /§a co ,sCD0 010 §2§2§2§§§ i2 k& 94000.1. [f|W%aa\,�4;a4o m; foo)[§2(" a pƒ Wk , 0W &7p-020 00-0 00o §; )#w.a4adaawadaa6d 0 10 0' )0)0 00 00 0 o.© #0000 0 00 #a{m°266 ci dcd do §cts,,o,o, [9/Ib���;,,,,;a,,§ \/\}2§/§[x§\§722)6& /)/70000R0000R00 1§#}¥SSSS§GSSG0., 0, 0 2 30®x®0000 0CDCDw 0 00{k26666m6/00dd § 0 § « 0 LW -0 9g)LL§ a 0 uj0 W coc=§=c=_'aaa !k!klm±!!kk%\kk Coral Mountain Master Plan Hydrology Report Appendix F RCFCD Synthetic Unit Hydrograph Worksheets 0.031 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER March 30, 2020 DLS 1 CORAL MOUNTAIN 2553 10 YEAR BASIN DA -A1 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 11 D 12 B 2 B 3 B 1 B 6 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT EXISTING BARREN 34.384 X 93 0.09 0.05 EXISTING OPEN BRUSH - POOR 30.363 X 76 0.29 0.05 PAVING/HARDSCAPE 0.000 D 56 0.51 1.00 WATER FEATURE 0.000 D 56 0.51 1.00 COMMERCIAL 0.000 D 56 0.51 0.90 SF - HIGH DENSITY 0.000 D 56 0.51 0.50 LANDSCAPING 23.665 D 56 0.51 0.10 LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION 1,180ft 590 ft 960.0 ft 461.0 ft 10 85% 14 0.71 in 1.06 in 1.36 in 2.23 in ELEVATION AREA 459.0 ft 65,765 sf 460.0 ft 77,310 sf 461.0 ft 89,480 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rlIVL21 1 W 1�1u �%NIIIIIL%d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 3/30/20 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 340,193 209,809 10 YEAR BASIN [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -A1 [3] AREA - ACRES 0.39 88.412 [4] L -FEET 147,065 3.38 1180 [5] L -MILES 90,475 2.08 0.223 [6] La -FEET 113,286 2.60 1.37 590.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.112 [8] ELEVATION OF HEADWATER n/a 960 [9] ELEVATION OF CONCENTRATION POINT 7.64 461 [10] H -FEET 460.50 1.50 499 [11] S-FEET/MILE LOWEST FLOW LINE ELEVATION DIFFERENCE (ft) 2232.8 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 47.25 [13] L*LCA/S^0.5 0.001 [14] AVERAGE MANNINGS'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.03 [15] LAG TIME -HOURS 1.0 0.04 [16] LAG TIME -MINUTES 2.5 [17] 100% OF LAG -MINUTES 2.5 [18] 200% OF LAG -MINUTES 4.9 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 10 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 0.71 in 3 -HOUR 1.06 in 6 -HOUR 1.36 in 24-HOUR 2.23 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 228,186 81,121 340,193 209,809 436,474 309,926 715,689 625,214 EFFECTIVE RAIN (in) 0.46 0.41 0.39 0.28 FLOOD VOLUME (cu -ft) (acre -ft) 147,065 3.38 130,384 2.99 126,548 2.91 90,475 2.08 _ REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 140,938 3.24 1.10 113,286 2.60 1.37 95,565 2.19 1.62 19,645 0.45 7.88 STORAGE PROVIDED (cu -ft) (acre -ft) 154,781 3.55 PEAK FLOW (cfs) n/a 70.45 58.94 7.64 MAXIMUM WSEL (ft) DEPTH (ft) 460.83 1.83 460.50 1.50 460.29 1.29 459.27 0.27 LOWEST FLOW LINE ELEVATION DIFFERENCE (ft) LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 1.0 0.9 1.0 1.0 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE OO o o) LO M 0 O 666666 0 0 0 O O 0 0 0 0 O 0.2195 0.8786 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00234 (24-(T/60))^1.55 + 0.13 in/hr Undeveloped Condition: Low Loss = 90% II L 0 y J O 3 O J II J H ° o E 2 m ce oJy m N .. >- 'R Du)oa C G .L+ > y G m LL O LOW LOSS RATE PER RCFC/2322 0.9000 0.9000 0.1000 0.1000 0.1800 0.5000 0.8200 LOW LOSS CONDITION UNDEVELOPED UNDEVELOPED DEVELOPED _ DEVELOPED DEVELOPED DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0334 0.0951 0.0000 0.0000 0.0000 0.0000 0.1242 N O AREA WEIGHTED AVERAGE 0.389 0.343 0.000 0.000 0.000 0.000 0.268 (n U CC Q V coo m M .0000 CD 000o 0 0 CD CD 0 0 23.665 N W SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) o co O N O O 0.05 0.05 9Z'0 01'0 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 5% 5% 0 0 O O 00 . N 0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] W W O N O O 0.51 0.51 0.51 0.51 In O RI NUMBER [Plate E-6.1] M co Q) N. co co U() co co LO (f7 co (fl LAND USE EXISTING BARREN EXISTING OPEN BRUSH - POOR PAVING/HARDSCAPE WATER FEATURE COMMERCIAL SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL=. [I ULM SOIL GROUP [Plate C-1] CI 03 03 03 03 03 03 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J W m _ 459.01 459.05 459.09 459.13 459.19 459.27 459.37 459.53 459.84 460.72 460.82 460.83 CO C 0.02 0.08 d- N N 0 0 x- ..- M V 0 0 n CO CO 0 0 1.39 3.02 V N N M M N F 4i C U 0 FO.' m M W ).j 6,175 9,444 N 0 Cei o 26,517 37,740 60,348 131,713 139,635 140,938 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 458 461 464 468 473 479 487 500 525 599 607 608 458 461 464 468 473 479 487 500 525 599 n 0 0 0 O 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 0 N 0 CO 0 M O 0 O 0 66,838 67,366 68,042 68,938 70,128 71,943 75,600 86,198 87,356 87,547 Basin Volume cu -ft 1,455 3,820 O 0) 14,093 19,639 27,004 38,240 M N M M 140,241 141,546 2 C j 1 00 1,455 2,824 3,280 3,736 0 0 00 7 CO 7,844 11,723 23,132 71,964 N 06/ a0 - Flood Hydrograph Flow cfs 4 CO a 7 0 10.93 12.45 15.50 20.06 .- o N M .— ° Of r N 28.43 6.37 U) > CL 6 0 5 W 8'- 0 0 V 0 0 0.17 0.23 0.29 0.44 0.86 2.69 N n 0 0 0 Loss Rate in/hr Max 1 Low n N M O O 0.33 0.34 0.37 0.42 0.48 0.61 0.98 2.59 0.50 0.28 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 Storm Rain in/hr CO co O O 0.38 0.39 co co O O 0 0.- O O N N M O O RCFC & WCD G 7DGi0O1. Wf NIG1Gfl. IMIL DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 203.6 TOTAL ADJUSTED STORM RAIN -INCHES 0.71 CONSTANT LOSS RATE-in/hr 0.25 LOW LOSS RATE - PERCENT 87.86% Pattern Percent (Plate E-5.9) 3.6 4.2 4.4 4.6 0 0 66 6.4 8.1 13.1 34.5 n co 6M Time Minutes Hours co N. O 0 0 N co N CO 0 0 0.42 0.50 co n LO 0 0 0 NMN n CO 0 0 0 O) O 0 0 oO Lr, N 25 30 35 40 45 50 55 _ 60 Unit Time Period - N M 0 6 0 n 0 0 0`- N C 0 03 =0005000 C_ U N } n w. N 0M W W0 o2Mcq Q U 0EU Csi N co 0 .17 N 0 u) W 2 7 J O W G Q O w O z J 0 LL W W W ~ Z W 00 (OJ R J z W W O O WB O O ZLU f • m i v`ni >>> W W w o m 0 O W » 3 m JWOO 0OY FQ 1-U- 1: 03 Wdd2a PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm Wco ci) x 00 459.00 459.00 459.00 459.00 459.01 459.01 459.01 459.02 459.02 459.02 459.03 459.03 459.03 459.04 Oi Qi vv 459.06 459.09 459.10 459.13 459.18 459.23 459.26 459.31 459.35 O (6 C To N 0.00 0.00 O O O O O 0.01 0.02 0.02 0.03 0.03 0.04 0.04 0.05 c0(O O O O O 0.07 0.06 O(0 O O co N O O 0.30 0.37 0.43 0.50 0.58 Om @ U 80 159 156 318 480 765 oc �CV co r- 7(4e 00 1,858 2,142 2,406 2,670 2,934 2,518 NN -4:(O 0 00, rCO 12,994 16,304 18,931 21,895 25,195 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 457 457 457 458 CO CO O O V 7 458 459 459 459 459 460 460 460 461 460 462 464 465 467 472 476 478 482 486 457 457 1 457 458 458 458 458 459 459 459 459 460 460 460 461 460 462 464 465 467 472 476 478 482 486 65,852 65,865 65,864 65,890 0(MO 0)0) 0 0 O O 65,989 66,035 66,081 66,107 Cr, W _A. O O O O 66,228 66,271 66,313 66,246 ON 10 CO O O CO O 66,978 67,294 67,940 68,476 O W cr CO CO 0 ( 0 Oi O CO O CO SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Basin Volume cu -ft _ 537 _ 617 a 000 Or O)N 1,385 1,670 1,955 2,116 I,- CV C00 N N 2,866 3,130 0) CO (h 0) C6 N 4,603 6,566 O0 10 V I: 05 (NO� 7 t` N u5 19,409 22,377 25,681 Volume In cu -ft 537 537 454 620 620 743 620 743 743 620 661 743 724 724 724 44 0 10 O N O V N N 1,405 2,425 4,466 3,786 3,106 3,446 3,786 Flood Hydrograph Flow cfs N. N. N 1.51 2.07 2.07 2.48 2.07 2.48 2.48 2.07 N V N N 7 V N N 2.41 0.15 6.95 8.08 4.68 8.08 14.89 12.62 10.35 11.49 12.62 Effective Rain in/hr 0.02 0.02 NN 0 0 0 0 NCO 0 0 0 0 NCO 0 0 0 0 MN 0 0 0 0 NCO 0 0N. 0 0 0.03 0.03 0.03 0.00 0.08 0.09 0.05 0.09 1-a 0 0 CV CO 7 0 0 0 Loss Rate in/hr Max 1 Low 0.15 0.15 0.12 0.17 ISO N N 0 0 r O N N 0 0 O r N mm 0 0 0.18 0.20 10 O0 N N 0 0 N N N 0 0 0)O N CO 0 0 0.27 0.30 0.37 0.35 N V 0 CO CO 0) O O O 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 N N 0 0 N N 0 0 N N 0 0 N N 0 0 0.25 0.25 0.25 Storm Rain in/hr N- 0 0 0) 0 0 CO 0 0 CO 0 0 0.23 0.19 0.20 0.23 CO CO O O 0.28 0.25 CO CO O O CO CO O O 0.42 0.39 0.37 0.38 0.39 RCFC & WCD MUDDI3o©I1= Ctrl FACACME DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 203.6 TOTAL ADJUSTED STORM RAIN (in) 1.06 CONSTANT LOSS RATE (in/hr) 0.25 LOW LOSS RATE - PERCENT 87.86% Pattern Percent (Plate E-5.9) 0) co. T- 0 0 CO 11) CO 1.8 1.5 O CO N N N N 2.2 2.0 CO I- N N V r N N 0) M M 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 ON) O CO 7 N CO 1.42 1.50 1.58 1.67 0 CO 1.92 2.00 2.08 _ 5 10 15 20 N CO 35 40 45 50 55 60 65 70 75 80 COO CO0 O N _ 105 110 1O O O T- N N Unit Time Period T- N M 0 0 I. O 0) C' N m, 15 16 T- CO 19 20 21 22 N N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J w 0 CO 459.45 459.59 459.65 459.87 460.10 460.35 460.50 460.50 460.50 460.50 460.50 U <0 C To N 0.74 0.96 1.07 1.43 a N- 0 co ,- N 2.60 2.59 2.59 2.60 2.59 Om @ C 'i U 32,230 41,975 N CO ,- O 0 7 t0 N 7 0 79,986 100,555 113,286 112,751 112,914 113,078 112,747 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 493 504 510 527 546 567 580 579 580 580 579 493 504 510 527 546 567 580 579 580 580 579 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 7771,052 2,628 73,378 75,941 )O N CO .1 - CO O CO. 0 h 0 83,504 83,426 83,450 83,474 83,425 Basin Volume cu -ft 32,723 42,479 47,122 62,985 MN 10 O 0 OD W CO M M , 113,494 113,658 113,326 0n E C 0 > 7,528 10,250 M j M ui O 18,074 21,136 Mmr M 743 743 248 Flood Hydrograph Flow cfs 25.09 34.17 17.16 54.58 Lo 0 n M 0 O 0 0NI- coM N N 0 Effective Rain in/hr 000)- N M 0 0 0 0 0 00) CO 1 0 0 0.50 0.00 or) M. - O O O O O O Loss Rate in/hr Max 1 Low 7 co 0 0 M r 0 0 0.82 0.92 0.66 0.22 N N O O O O 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 Storm Rain in/hr 0.53 0.64 0.45 0.86 0.93 1.04 0.75 0.25 0.23 0.23 0.08 RCFC & WCD GOO oDD o@E Ctrl FACACME DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 203.6 TOTAL ADJUSTED STORM RAIN (in) 1.06 CONSTANT LOSS RATE (in/hr) 0.25 LOW LOSS RATE - PERCENT 87.86% Pattern Percent (Plate E-5.9) N O V N 3.5 6.8 M N I- Co 5.9 2.0 0 CO. 0 u-•- O Time Minutes Hours N N N co V N N 2.50 2.58 2.67 2.75 CO 0 0 N N M O N M 0 140 _ 145 150 _ 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 N CO CO CO 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C 0 U C 0 0 0 U 0 U U 0 O M 0 7 0 0 0 0 LL7 n U T- • W CO CO (00 CO O c0 0) D O N M N h N- F - CD wW Nr 0 0 Lai Z uj I-0 <M2,2° < OJ c O CO M Z W JZJ 0u)00wWw<5Jj PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W ca com 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 I 459.00 5 U N ; C co 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Om @ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 W OD N M CO W M M CO , I- M M n N- M M n r M M 777 h N M 7 N N 7I7 424 424 777777 N N 7 7 N N 7 7 N N 7 7 457 CO N 7 7 CO OA 7 7 CO OA 7 7 CO OA 7 7 CO OA 7 7 CO OA 7 7 CO OA 7 7 CO OA 7 7 CO OA 7 7 N OA 7 7 N OA 7 7 N OA 7 7 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 65,808 65,816 CO CO W W N I CO (O 65,816 65,825 65,825 65,825 65,825 65,825 65,825 65,833 65,833 65,833 M M COCOCOCOCOCOCOCOCOW CO CO N to (O CO M M CO CO N O CO (O M M CO CO N O CO (O M M CO CO N O CO (O M N CO N O CO (O N .N E NJ > p U u�� O N CO CO CO tO r1., CO CO I....1., CO CO I....1., CO CO 777777777777 N CO 7 N N 7 7 N N 7 7 N N 7 7 N N 7 7 N N 7 7 I� N 1....m 7 7 (1) j O U > 265 318 318 318 318 371 371 371 371 371 77 I- N M 7 7 N N 7 7 7 7 N N 7 7 7 7 N N 7 7 7 7 N N 7 7 7 7 N N 7 7 477 Flood Hydrograph Flow cfs 0.88 1.06 O (ID OO 1.06 1.24 1.24 1.24 1.24 1.24 1.24 1.41 7 7 7 7 7 7 7 7 7 7 1.41 1.59 U) C U '(p L g Q' 5 W O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 Loss Rate in/hr Max 1 Low N- rn 0 0 0 0 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 0 0 0 0 0 N__________ 0 0 0 0 0 0 0 0 0 0 0 0 N CO N. 0 0 NNNNNNNNNNNNNNNNNNNNNNN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 Storm Rain in/hr a0 0 Or . O O 0 0 O O 0 O O O O O O CO O O CO CO O O CO CO O6 CO CO O O CO CO O O CO CO . O O MEM 0.15 RCFC & WCD MUDDI3o©I1= Ctrl DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 203.6 TOTAL ADJUSTED STORM RAIN (in) 1.36 CONSTANT LOSS RATE (in/hr) 0.25 LOW LOSS RATE - PERCENT 87.86% ,"":"7,— C 5 L) E Y U W N a a m ET_ O (D o 0 (D (D 0 0 (D 1-, 0 0 1` 1-, 0 0 1` 1-, 0 0 1` W 0 0 OD W 0 0 OD W 0 0 OD W 0 0 OD W 0 0 OD W 0 0 OD O) 0 0 Time Minutes Hours co N. O O 0.25 0.33 0.42 0.50 1MO CDD O O 0.75 0.83 ON) O O O 1", N CO 1.42 1.50 1.58 1.67 1.75 1.83 MEM 2.00 O If) O N LO O N M (O O M 7 (O O 7 (O (O O (O (O If) O CO 1- If) O r O If) O CO(O O) If) 0 O) CD 1 0 0 CD LO 0 Unit Time Period N N M7OO OD N- CO OO N 7 15 16 r- co OO N N N N M7 N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm ) W m 0 w on 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.01 459.01 459.01 459.01 459.01 459.01 459.02 459.02 459.03 o 0 oi O i vv 459.03 459.03 o 0 oi O i vv 4, U f0 ; C i0 N 0 0 0 0 0 0 0 0 o 0 0 0 0 0 o 0 0 0 0 0 o 0 0 0 0 o 0 0 0 o 0 0 0 .- o 0 0 0 N N o 0 06 N 0) o o 06 7 4 o o 06 N 0 o o 06 N 10 o o . 0 0 N N- o o . 0 0 Om N S j U 0 0 N m 2 M N 0) 0 1� m O I- c- co O N O N I- N N 0) V CO N 0) V V 1- co W O N I N co co co N.N N N (V CO I. V NON N (V N. V co co N (V Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 444 457 457 _ 457 457 457 457 457 457 458 458 458 458 458 458 458 458 459 459 459 460 460 460 460 460 460 457 457 457 457 457 457 457 457 457 458 458 458 458 458 458 458 458 459 459 459 460 460 460 460 460 460 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM O 0 (0 (0 z d y 0 4 N a r N c07 W 0 N N 0 0 NO V V 0 0 (O(O(O(O(O(O(O(O(ON 0 0 NN co O 0 0 O, - LC)COCDCO co O 0 0 MN co O 0 0 c0 c0 co 0) 0 0 O0000)0O W 0) NN 0 0 W 0) N N 0 0 0 0 00 0 0 NO 0 (O O 0 0 NCO N O(O0(00(0 0 0 OO N- 0 0 N N N M 0 0 Basin Volume cu -ft 444 477 h 0 V N 536 556 575 595 1. 0 CO r N M 812 885 957 1,082 h N O CO I. N O O V N (` I N M( 0 N O O M N N 2,642 2,977 2,741 2,504 MIEMM 3,342 0) E w = E j UN 15 10 r 4 r r n r r r n r r r n r 0 0 N M 0 O N M O CO N O CO CO O O O 0) M 0 N N 7 V N N 0) 0) 7 V Fl O O) O O N— Flood Hydrograph Flow cfs 1 .41 1.59 1.59 1.59 1.59 1.59 N � N, 1.77 1.77 1.77 1.77 1.77 1.94 1.94 1.94 .- COom N N 2.47 2.47 2.65 2.65 0- � O O 3.65 0) C U '(p s a' C W N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N M O O 0 0 M M O O 0 0 M M O O 0 0 O O 0 0 N a O O 0 0 Loss Rate in/hr Max 1 Low 0.11 0.13 co M O O co M O O co M O O 10 10 O O 10 10 O O 10 0 O O 0 0 O O N 0) O O 0.20 _ 0.20 N N N N O O M M N N O O 0.24 0.26 (n N N N 0 0 N N N N 0 0 N N N N 0 0 N N N N 0 0 N N N N 0 0 N N N N 0 0 CO N N N 0 0 CO N N N 0 0 N N N N 0 0 N N N N 0 0 N N N N 0 0 N N N N 0 0 N N 0 0 Storm Rain in/hr 0.13 0.15 N N O O N N O O N N O O 0 0 O O 0 0 O O 0 0 O O (0 N O O 0.20 0.21 0.23 0.23 N N O O 0.26 0.26 0.28 0.29 RCFC & WCD GOO oDD o@E Ctrl NIG3MML \E DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 203.6 TOTAL ADJUSTED STORM RAIN (in) 1.36 CONSTANT LOSS RATE (in/hr) 0.25 LOW LOSS RATE - PERCENT 87.86% T C C N d V W (0O a a a m F,_ m O) 0 0 O)0) 0 0 O)0) 0 0 O)0) 0 0 OOOOO77. T- T- T- T- T- T- 7 T- T- NM T- T- ',7 T- T- N N T- T- W.O T- T- 1*--. T- Time Minutes Hours 2.08 2.17 NM N N 2.42 2.50 2.58 2.67 rW N N 2.92 3.00 3.08 3.17 NM M M 3.42 3.50 3.58 3.67 rW M M 3.92 4.00 4.08 4.17 N O N CO X N O M cr 4 N O N % N O N co % N O co 1- % N O r 0 % N O CO 0) % N O 0) O N N O O N N N O N N N N O N M N N N O CO V N N N O 7 N N N Unit Time Period 0 0 N N 0- CO N N 29 30 31 32 M a M Cl 35 36 r CO M co 39 40 41 42 M a V V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm w 0 0) w m 459.06 459.08 459.10 459.13 459.16 459.20 459.25 459.29 459.35 459.40 459.49 459.61 459.74 459.90 460.07 460.28 460.29 460.29 460.29 460.28 460.28 460.27 (0 O 0 ; C 75 N 0 M OT- 0 0 h T -N 0 0 h M NCO 0 0 M 07 0 0 h (O (0 co 0 0 0 O co c5. 0 T- N M N17 N- T- M N- "-1 N- N 0 0) N N 0 M N N I— (0 N N O W m SM U 3,952 5,459 W M M 11,709 14,514 17,753 20,987 O N N 35,027 43,474 53,219 64,262 77,472 94,594 95,565 _ 95,480 95,236 _ 94,940 94,538 _ 94,084 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft N M CO 7 7 CO CO CO0 M 7 7 O 7 I,- 7 0 7 (- CO 0 7 7 )O O CO 0 7 7 0) M 0) O 7 (0 I,- 0) N (O (O 7 LO (O 0 N N (O (O M 0 N (O (O M 0 O (O M MIO N M (O (0 7 7 M CO (O (O 7 7 0 7 h h..1` 7 7 h(O W 7 7 0 (00) 7 7 h 0 0 0 7 N h 0 v- N (O N 7 7 (O (O ((') N N CO CO (O (O N (O CO (O (O 0 (O (O (O (O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 66,478 66,722 67,036 67,349 67,733 68,186 68,710 69,233 69,826 70,489 7 O O I� 000 N— N 1....h. 74,447 76,233 78,268 80,771 80,913 _ 80,900 80,865 _ 80,822 80,763 _ 80,696 Basin Volume cu -ft 7 N 0 7 I O 7,864 9,805 12,179 14,988 OM N 7 W N 25,139 29,242 MO 0 00 M 7 53,736 64,791 78,016 95,155 h -CV , O 0) 0) 95,798 95,501 95,099 94,644 O E ,f =E j U M O M (0 -077 T- T- M M 0 0 NNN N P. 7 1 MN CO (O (0 I- r CO CO N M (O M ..1�0 77 M it. 2 (O CO N N M r Nu O.� N z1") al aO M M I- M4 �7 M IO M MN 0 0 -O Flood Hydrograph Flow cfs Lr, (P (D 8.02 8.02 7MMM 0.-.- 13.84 15.29 22.57 29.84 Non) M M 45.85 58.94 5.11 1.59 1.06 0.88 ( M O O co Q% mec s Q' C W 0000666666 8 Q 0 0 0 0' 0 0 N 0 0 7 7 0 0 M I. 0 0 (O M NM 0 0 a0 M M7 0 0 (O (O (0000000 0 0 M N 0 0 0 0 O 0 0 Loss Rate in/hr Max 1 Low 0.27 0.29 O O 66666666 N M 7 7 0(00) (O I- 0.44 0.52 MO 0O O O 0.67 0.80 0.27 _ 0.13 ON - 00 66 0.04 0.03 (n N N N 0 0 (O (O N N 0 0 (O (O N N 0 0 (O (O N N 0 0 (O (O N N 0 0 (O (O N N 0 0 (O (O N N 0 0 (O (O N N 0 6 (O (O N N O 6 (O (O N N O 6 (O IO N N O O Storm Rain in/hr 0.31 0.33 MM 66 0.36 0.38 MM 666666 70 (00) 0.64 0.69 r0 O O 0.31 0.15 0.10 0.08 OO 66 RCFC & WCD GOO DDD o@E Ctrl NIG3MML \E DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 203.6 TOTAL ADJUSTED STORM RAIN (in) 1.36 CONSTANT LOSS RATE (in/hr) 0.25 LOW LOSS RATE - PERCENT 87.86% Pattern Percent (Plate E-5.9) 00,—,— N (V N 2.2 2.3 00 N N 2.5 _ 2.6 3.1 3.6 3.9 4.2 4.7 5.6 0 0 ,— 0 0.6 0.5 MCV 66 Time Minutes Hours 0) M N M 7 7 N O 7 (0 7 7 00 N- (0 0 0 0 (0 M I- M 0 0 N O 0 0 0 (C 000- 0 N— (n 6 (0 M N M (n 6 N O 7 (0 (n (0 00 (- M (O (n (0 (0 M I- M (n (0 N O 0 0 (n (O 6666666666666666666666 0 M N N (O f. N N r M N N M 0 N N 0 0 N M 0 M M N M M N M M M M 7 M M 7 (O M M (0 O M M Unit Time Period 51 52 53 54 55 56 57 58 (00 0 (0 (O <N O 63 64 O (00 (O 67 _ 68 (0)0, 0- --CV l- r EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 55 5 5 5.5 C U U C U U U V g U V E O M M 0) O N N N 7 (0 M M 7 M F g z 0 WWN F W 00 woo 10 Q J= Z w. 00 E 000 LLO0Z7coc BZW 4J�>OOwwWO<W J0 <01— �(nW_j Z O 7 1--QLLQQ00>¢E-W I-K(0W L11L W 2O E-< PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C N w 0' CO 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.01 459.01 459.02 459.02 459.02 459.02 1j 459.03 Total In Basin cu -ft ac -ft O O OO . O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO O O O O OO 00'0 00'0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0O 0.03 0.04 7 7 7 O O O . O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 r- 393 753 0) O r- r co 1- co Lf", 0M) Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 174 261 CO O V N CO O O N N CO O V N M CO CO 7 V CO M 434 434 434 434 7 co N 7 in co N O (0 CO 608 695 co N O (0 CO 695 695 NN CO CO r 0) 0) O CO CO CO 0) O0 O 0 CO 0) 1,043 1,130 CO CO OM h- M M 1,376 1,377 1,379 1,381 O O CO CO CO I". N co co r r co.. co. r r M co. r 1` M co. r 1` co.. co. N N r 1` co.. co. N N r 1` co.. co. N N r 1` co.. co. N N N 1` co co. N N N 1` co co. N N N 1` co co. N N N 1` co co. 1,373 1,373 1,373 1,373 CO CO N 1` co co 1,374 1,374 1,374 1,374 UD u) N r co co 1,376 1,377 1,379 1,381 O 0 co co co co co M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00234 Low Loss Rate (percent) 87.86% 65,793 65,807 65,807 65,821 I.- n O O CO CO < < (0 N 0 0 t` O N CO CO < < (0 N 0 0 N N CO CO < < (0 N 0 0 65,835 65,835 65,835 65,835 65,835 65,849 65,849 65,863 M I- (D n CO CO < < (0 u0 O O 65,849 65,863 I� I- N- n CO CO < < (0 u0 O O 0) 0) CO CO < < (0 u0 O O 65,905 65,905 65,905 65,919 65,933 65,948 (D (O N- r 0) 0) < < (0 uO O co 0 CD 0) O 0) O < < Cc0 CO co 66,051 66,109 CO CO (O . N < < (D c0 O O 66,255 66,243 66,301 Basin Volume cu -ft 174 261 261 348 261 261 261 348 348 348 434 434 434 434 434 521 521 608 608 695 521 608 695 695 782 782 0) 0) O O CO CO 0) c0 O u) CO m 1,043 1,130 co co O M o% r- ,- 0 COr- 0)) 0) M V r- ,- 1,769 2,130 CO r- (C) T- N M M 10 T- O 0) CO M N M Volume In cu -ft 174 261 c0 V N CO (0 (D N N (0 V N CO V V M CO 434 434 434 434 434 521 521 608 608 695 521 608 695 695 782 782 COD 100 0)0)0)0) COD 10 1,043 1,130 M M ,- ,- 1,390 1,477 (1D CO r-,- UD N CO 0) r-,- CO CO M M N- r-,- T- Flood Hydrograph Flow cfs 0) O) T- N O O 0.29 0.39 0.29 0.29 0)00)0(010(010 N co 0 0 CO co 0 0 V 7 0 0 V 7 0 0 0.48 0.58 0.58 0.68 CO r O r O O 0.58 0.68 r r r r O O 0.87 0.87 r r CO CT 0 0 r CO CO O 0 T co co T- N T LO co 7 7 7 7 c0 co co co co O 2.03 2.12 LO co co 7 7 O) 4) U C ,T,E K .(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6(6 W 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 N N N O O O O O O Loss Rate in/hr Max I Low c0 V O O O O 0.024 0.031 0.024 0.024 0.024 0.031 0.031 0.031 0.039 0.039 0.039 0.039 0.039 0.047 0.047 0.055 c0 CO O co 0) O O 0.047 0.055 0.063 0.063 0.071 0.071 0.078 0.078 0.078 0.086 V N ) O O O 0.118 0.118 (C) CO N M_ 0 0 0) 1— V 10 0 0 UD N CO 1- 0 0 CO CO 1� r- T- 10 0 0 0 0.446 0.441 0.436 0.431 0.426 0.421 0.416 0.411 0.406 0.401 0) 0) CO CO O O 0.386 0.381 0.377 0.372 0.367 0.363 1) co CO CO O O 0.349 0.344 0.340 0.335 CO CO CO CO O O N,- CO CO O O MEM 0.309 0.305 0.301 0.296 0.292 CO CO N N O O 0.280 0.276 0.272 0.268 10 CO LO N N N O O O Storm Rain in/hr CO I� N O O 00 0.027 0.036 1` h- 0)0)0)0)0)0) 090909 O O 1` CO O O CO CO O O 0.045 0.045 0.045 0.045 0.045 0.054 0.054 0.062 N CO 1- O O O O 0.054 0.062 r 1` Q2°.2°.2°.°.'-'- O O O O CO CO O O 0) 0) a0 C0 O O 0) CO 00 O O O N (0 O,— O O 0.134 0.134 0.143 0.152 CO CO CO 1` 0 0 I- CO co O 0 0 V V CO co co r 0 0 0 RCFC & WCD Cz11ff7��/DG3MrCIr/Ofn1QV IPllv Z:\HI ILS DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 611% TOTAL ADJUSTED STORM RAIN (in) 2.23 Pattern Percent (Plate E-5.9) N CO 0 0 CO V 0 0 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 LO CO O O O 1- O O 0.7 0.8 CD 1` O O 0.8 0.8 0) O 0 0 O O ,-- r- O ,-- ,- N M r- ,- LO co. r- ,- co. 1 r- ,- O) O r- N r- N N N LO (D r- ,- N 0 0 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 r O N 10 3.25 3.50 co r O (`0 V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 LO h.- CD t01- MEM 7 50 r 0 1 0 8.25 8.50 8.75 9.00 9.25 9.50 N O 0 6 s_ N 1U 0 02 Time Minutes 15 30 45 60 LO O n O 105 120 135 150 165 180 195 210 225 240 255 270 285 300 .— M CO CO 345 360 375 390 405 420 1 450 465 480 495 510 525 540 555 570 585 600 .- OM 7 LO (0 (O CO Unit Time Period T-. (V CO V 40 CO 1- CO 0) C"- T- N T- T- M V T- T- 15 16 r CO T- T- 19 20 N N N CO V N N 25 26 27 28 29 30 N CO CO co 7 CO M 35 36 1- c0 CO M 39 40 N co 0) 7 7 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm m J W CO 459.03 459.04 459.04 459.04 459.04 459.05 459.04 459.04 459.06 459.13 459.21 459.22 459.23 459.24 459.25 459.27 459.27 459.27 459.27 459.27 459.27 459.26 459.24 459.23 459.21 459.20 459.18 459.17 459.16 459.14 459.13 459.11 459.09 459.08 459.06 459.05 459.03 459.01 459.00 459.00 459.00 459.00 I 459.00 Total In Basin cu -ft ac -ft DD 0 O CO O 0 0 O O h 1a- 0 0 O O 0) (O 0 0 O O h 0 0.- O O 0.22 0.34 (D la- CO CO O O 0 V 7 O O 0.44 0.45 O M. V 7 0 0 (n IO V a 0 0 CO 0 7 7 0 0 0.37 0.35 N 0 CO CO O O 0.28 0.26 0.23 0.21 0.18 0.15 CO 0 0 O 0.08 0.05 0.02 0.00 0.00 0.00 0.00 0.00 O) N (N- 2,556 2,823 (O (0 p) p N M 3,879 2,550 2,929 4,295 9,493 14,942 15,514 16,083 17,300 18,052 19,053 19,583 7 N (O N T1 W 19,435 19,645 18,555 17,469 16,300 15,134 14,146 13,162 12,180 11,116 10,055 8,997 (O M W CD I' (O 5,500 4,458 3,333 2,125 1- 00 0 T - 0 0 0 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft co (`") 1,384 1,385 1,385 CO CO MM 1,385 1,389 1,407 1,425 1,427 1,429 1,433 1,436 1,439 1,441 V V VV 1,440 1,441 1,437 1,434 1,430 1,426 1,423 1,419 1,416 1,412 1,409 1,405 O 0 V M 1,393 1,390 1,386 1,382 1,378 1,268 261 174 MOM 174 N N CO 1,383 1,384 1,385 1,385 1,388 1,383 1,385 1,389 1,407 1,425 1,427 1,429 1,433 1,436 1,439 1,441 O V V V V O V V V V 1,437 1,434 O (O CO N V V CO 0) NY- V V 1,416 1,412 1,409 1,405 f` O0) V co 1,393 1,390 1,386 1,382 1,378 1,374 I's r.... co co I's t` co M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00234 Low Loss Rate (percent) 87.86% Percolation Area sf ro (n (") (O 66,402 66,445 66,460 66,489 66,616 66,400 N M (O OD 7(O (O (O O CO 67,526 68,409 68,502 68,594 M 0)T- N- OD'--.. c0 co" O O 69,076 69,162 M 1..... CD O) 0) O O (0 N M1- 0) 0) O O 68,995 68,819 68,629 68,440 68,280 68,121 67,962 67,789 h (O a- V V N. r CO O 67,261 67,062 0) O ha- OI- (O (O CO O 66,527 66,332 O O (D a-0) (O (1) CO O 65,807 65,793 65,807 65,793 C O (ND 7 m 0 U 0 co� (,.) 3,940 4,207 4,300 4,480 5,267 3,933 4,313 5,684 O CO 0 CO 000 N 0 18,733 19,488 20,492 21,024 21,082 20,664 20,875 21,086 19,992 18,902 17,729 16,560 15,569 14,581 13,596 12,528 11,463 10,402 9,258 8,030 6,894 5,848 4,719 3,507 2,386 1,268 261 174 MEM 174 Volume In cu -ft of 07 r U7 CO O T- 1,477 1,564 N �v (n N 1,764 2,755 O M Onrn0) O DD O (O O T 0) 0) N 2,649 2,188 2,439 1,971 1,499 1,023 (00) (0 0 T- 348 348 mm N N 434 434 434 348 348 348 261 174 261 348 261 174 261 261 261 174 261 174 Flood Hydrograph Flow cfs M 0) MM O O a- 1.64 1.74 CO V 0 N O 1.96 3.06 7.64 N N N N (Ni N— 2.94 2.43 2.71 2.19 1'. act co. 7 MM co O O — 0) 0) CO M O O 0) 0) N N O O 0.48 0.48 O0) M M O O 01 0) M M O O 01 0) N a - O O 01 0) NMN O O 01 0) a- O O 0.29 0.29 01 0) N a- O O 01 0) N s- O O Effective Rain in/hr 0.02 0.02 0.02 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O 0 0 0 O 0 0 0 O 0.00 0.00 0.00 0.00 0 N.0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 0.00 0.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Loss Rate in/hr Max I Low (n (6 0.149 0.149 0.133 0.141 00) 0 a- N O O 0.219 0.227 (00 (00 N N O O 086'0 096'0 0.212 0.204 0.204 0.196 086'0 886'0 0.149 0.149 0.031 0.031 0.024 0.024 0.039 0.039 M M 0 0 O O 0.031 0.031 0.024 0.016 0.024 0.031 0.024 0.016 0.024 0.024 0.024 0.016 0.024 0.016 CO U) N N O 0.249 0.246 Cl O CO Cl N O O 0.235 0.231 0.228 0.224 0.221 0.218 ach .- Cl N O O 0.208 0.205 0.202 0.198 (f) N 0) 0) O O 0) N- cO O O O 0.184 0.181 O 0) N. n O (6 CO 0 n n O (6 0.168 0.165 0.163 0.160 0.158 0.156 0.154 0.152 0) I- mt M O O 0.145 0.144 Cl 0 mt 7 O O N N- CO CO O O Storm Rain in/hr 0.178 0) O) O O O 0 0.152 0.161 0.223 0.232 0.250 0.259 0.303 0.303 0.205 0.205 N CO N N 0 0 NM CO N N N 0 0 mt0) Y- 0 N N 0 0 0) 0) 0 0 Y- Y- 0 0 00 CO M O O 0 0 0.027 0.027 0.045 0.045 0.045 0.036 0.036 0.036 1.-- CO N Y- O O O O 0.027 0.036 1.-- CO N Y- O O O O 0.027 0.027 n CO N Y- O O O O n CO N Y - O O O O RCFC & WCD FIVDL30O LOO U FAL^Qm aL DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 611% TOTAL ADJUSTED STORM RAIN (in) 2.23 Pattern Percent (Plate E-5.9) O W 0 r r r co. r r (n O N N 2.8 2.9 V V co M co co N N 1- O N N 2.6 2.5 V 00 N N 0) 0) N- 0.4 0.4 CO CO O O 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 CO N O O 0.3 0.3 0.3 0.2 0.2 O O O (n O N n T- r 11.75 12.00 12.25 12.50 12.75 13.00 (D O N O T- T- C6 13.75 14.00 (D O N O 4 T- 0 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.50 Time Minutes O CO O 675 690 705 720 735 750 765 780 795 810 825 840 855 870 885 900 (0 0 M O O 945 960 (0 O 0) 0) O O 1005 1020 1035 1050 LO O O CO O O 1095 1110 1125 1140 1155 1170 1185 1200 1215 1230 1245 1260 1290 Unit Time Period 7 7 0 O 7 V 47 48 49 50 51 52 M V (n O 55 56 h co 0 (n 0) O 0 O Y- CV 0 O 63 64 1001s O O CO O O 0/ 0 0 N Y- CV n N 73 74 75 76 f- O0) h OY- CO N 00 CO 83 84 85 86 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm 0-1 W mo I 459.00 I 459.00 459.00 459.00 459.00 459.00 459.00 459.00 L I 459.00 Ii 1 459.00 Total In Basin cu -ft ac -ft 0.00 O O O 0.00 0.00 O O 0.00 0.00 O O O O O 0 0 0 0 0 0 0 0 0 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O 174 261 174 174 174 174 174 174 I N 1 T. r- � T. � � M M M M M M M M M M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00234 Low Loss Rate (percent) 87.86% Percolation Area sf 65,807 65,793 65,807 65,793 65,793 65,793 65,793 65,793 65,793 65,793 1 N C v- MZIM 261 174 174 174 174 MEM 174 174 220 U 0 m ; (O N Volume In cu -ft O 261 174 174 174 174 MEM 174 V r - CV T- Flood Hydrograph Flow cfs 0.29 0)00)00)0)0)0)0) 0 0 0 0 0 0 0 0 0 Effective Rain in/hr I 0.00 O O 0.00 0.00 0.00 0.00 0.00 0.00 O O O O O O O Loss Rate in/hr Max I Low 0.024 0.016 0.024 0.016 0.016 0.016 0.016 0.016 0.016 co O O 0.135 I 0.134 0.133 0.131 0.130 0.129 0.128 0.128 0.127 co 0 Storm Rain in/hr 0.027 (0N- 0.018 0.018 0.018 0.018 0.018 0.018 0.018 I 0) 00 O O RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z DRAINAGE AREA -ACRES 88.41 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.46 UNIT TIME -PERCENT OF LAG 611% TOTAL ADJUSTED STORM RAIN (in) 2.23 Pattern Percent (Plate E-5.9) M N M N N N N Z'0 Z'0 N 0 0 0 0 0 0 0 O o2 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 1 Time Minutes 1305 1320 1335 1350 1365 O (0 1410 1425 0 COM MM V V Unit Time Period 87 88 89 0 N M 7 (0 (O 0) 0) 0) 0 0) 0) 0) EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY (0 ( C C U U U 0 U 0^ V U Fs 6 6 13 N W s- 0 W r U7 7 0 j (a0 r M 0) O N O O 7? O 1n CO .- 1n N d O O Ct r fN0 z 0 ww w~ w 00 Wig J. Z W W Q c, 1-0OU LIO co g 7 ig tj tj g Z W g--jOOWWwOQw ▪ Z<01— cece ▪ _ W_ _1000-- n O< O LL_I Ow W Q W O> 1—W cow LLLL2LL2mi—< BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: 10 YEAR BASIN BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 459 0 0 65,765 0 0 0.00 460 1 1 11,545 77,310 71,460 71,460 1.64 461 1 2 12,170 89,480 83,321 154,781 3.55 WHERE: V= l(E�—E2)(At+A2 +.lAiA2) 3 Basin Volume Worksheet Page 13 of 13 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE: WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER March 30, 2020 DLS CORAL MOUNTAIN 2553 REQUIRED 10 YEAR STORAGE DA -A2 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 1 B 6 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT PAVING/HARDSCAPE 2.071 D 56 0.51 1.00 COMMERCIAL 5.752 D 56 0.51 0.90 SF - HIGH DENSITY 8.141 D 56 0.51 0.50 LANDSCAPING 1.350 D 56 0.51 0.10 LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (For Storms Greater Than 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR 1,260 ft 630 ft 465.3 ft 458.0 ft 0.02 10 85% 14 0.71 in 1.06 in 1.36 in 2.23 in RCFC & WCD ( WIDQCDLCAW CATIA I°- IMJMd SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 3/30/20 PHYSICAL DATA TOTAL RAINFALL (in) [1] CONCENTRATION POINT 1.06 REQUIRED 10 YEAR STORAGE [2] AREA DESIGNATION RAINFALL VOLUME (cuft) DA -A2 [3] AREA - ACRES 85,476 17.314 [4] L -FEET 12,970 1260 [5] L -MILES 73,692 0.239 [6] La -FEET 0.55 630.00 [7] La -MILES FLOOD VOLUME (cu -ft) 0.119 [8] ELEVATION OF HEADWATER 45,742 465.3 [9] ELEVATION OF CONCENTRATION POINT 0.73 458 [10] H -FEET 1.53 7.3 [11] S-FEET/MILE 14.61 30.6 [12] SA0.5 5.53 [13] L*LCA/SA0.5 0.005 [14] AVERAGE MANNINGS'N' 0.02 [15] LAG TIME -HOURS 0.06 [16] LAG TIME -MINUTES 3.9 [17] 100% OF LAG -MINUTES 3.9 [18] 200% OF LAG -MINUTES 7.8 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 10 NOAA ATLAS 14 [3] DURATION: Point Rain 1 -HOUR 0.71 in 3 -HOUR 1.06 in 6 -HOUR 1.36 in 24-HOUR 2.23 in STORM EVENT SUMMARY DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR TOTAL RAINFALL (in) 0.71 1.06 1.36 2.23 RAINFALL VOLUME (cuft) 44,624 66,621 85,476 140,156 SOIL LOSSES (cuft) 12,970 32,123 39,734 73,692 EFFECTIVE RAIN (in) 0.50 0.55 0.73 1.06 FLOOD VOLUME (cu -ft) 31,653 34,498 45,742 66,464 (acre -ft) 0.73 0.79 1.05 1.53 PEAK FLOW (cfs) N/A 14.61 12.35 2.19 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 9 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE (in/hr) N 00) r l() O O O O IA M N O ) (O O O 0.3708 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less = 0.00191 (24-(T/60))^1.55 + 0.10 in/hr Undeveloped Condition: Low Loss = 90% a L w N N N J J O O J 11 J E a : .2o E d J m o j y To swore ei .0 o W >'a coc N `p G m LL 0 LOW LOSS RATE PER RCFC/2322 (in/hr) O O o o o co O O 0.5000 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED DEVELOPED 1 MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) (ON O O O O 0.1319 0.0362 0.2064 AREA WEIGHTED AVERAGE 0.120 0.332 0.470 0.078 CC) <,i- Lu W Q N C N Lti 8.141 1.350 7 r) N: SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) Ln (0 O O O O 0.28 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] co O N . 0 0 O- PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 0.51 RI NUMBER [Plate E-6.1] O co co co LAND USE PAVING/HARDSCAPE COMMERCIAL SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL°MUL°.L SOIL GROUP [Plate C-1] mmmm RCFC & WCD IIJVIDQOdOW'1 AMA C°. R9 MI SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM PROJECT: CORAL MOUNTAIN Job No.: 2553 DATE BY: DLS 3/30/20 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 17.31 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.89 UNIT TIME -PERCENT OF LAG 128.6 TOTAL ADJUSTED STORM RAIN -INCHES 0.71 CONSTANT LOSS RATE-in/hr 0.21 LOW LOSS RATE - PERCENT 37% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 5 0.08 3.6 0.31 0.21 0.11 0.10 1.75 2 10 0.17 4.2 0.36 0.21 0.13 0.15 2.64 3 15 0.25 4.4 0.37 0.21 0.14 0.17 2.94 4 20 0.33 4.6 0.39 0.21 0.15 0.19 3.24 5 25 0.42 5.0 0.43 0.21 0.16 0.22 3.83 6 30 0.50 5.6 0.48 0.21 0.18 0.27 4.73 7 35 0.58 6.4 0.55 0.21 0.20 0.34 5.92 8 40 0.67 8.1 0.69 0.21 0.26 0.48 8.45 9 45 0.75 13.1 1.12 0.21 0.41 0.91 15.88 10 50 0.83 34.5 2.94 0.21 1.09 2.73 47.71 11 55 0.92 6.7 0.57 0.21 0.21 0.36 6.36 12 60 1.00 3.8 0.32 0.21 0.12 0.12 2.05 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in) RAINFALL VOLUME (cuft) SOIL LOSSES (cuft) EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 0.71 44,624 12,970 0.50 0.73 31,653 47.71 Plate E-2.2 1 Hour Storm Page 4 of 9 RCFC & WCD FIVID,�', ©10x37 �1u �°. NUL°, d SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM PROJECT: CORAL MOUNTAIN Job No.: 2553 DATE BY: DLS 3/30/20 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 17.31 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.89 UNIT TIME -PERCENT OF LAG 128.6 TOTAL ADJUSTED STORM RAIN -INCHES 1.06 CONSTANT LOSS RATE-in/hr 0.21 LOW LOSS RATE PERCENT 37% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 5 0.08 1.3 0.17 0.21 0.06 0.10 1.82 2 10 0.17 1.3 0.17 0.21 0.06 0.10 1.82 3 15 0.25 1.1 0.14 0.21 0.05 0.09 1.54 4 20 0.33 1.5 0.19 0.21 0.07 0.12 2.10 5 25 0.42 1.5 0.19 0.21 0.07 0.12 2.10 6 30 0.50 1.8 0.23 0.21 0.08 0.02 0.39 7 35 0.58 1.5 0.19 0.21 0.07 0.12 2.10 8 40 0.67 1.8 0.23 0.21 0.08 0.02 0.39 9 45 0.75 1.8 0.23 0.21 0.08 0.02 0.39 10 50 0.83 1.5 0.19 0.21 0.07 0.12 2.10 11 55 0.92 1.6 0.20 0.21 0.08 0.13 2.24 12 60 1.00 1.8 0.23 0.21 0.08 0.02 0.39 13 65 1.08 2.2 0.28 0.21 0.10 0.07 1.28 14 70 1.17 2.2 0.28 0.21 0.10 0.07 1.28 15 75 1.25 2.2 0.28 0.21 0.10 0.07 1.28 16 80 1.33 2.0 0.25 0.21 0.09 0.05 0.84 17 85 1.42 2.6 0.33 0.21 0.12 0.12 2.17 18 90 1.50 2.7 0.34 0.21 0.13 0.14 2.39 19 95 1.58 2.4 0.31 0.21 0.11 0.10 1.73 20 100 1.67 2.7 0.34 0.21 0.13 0.14 2.39 21 105 1.75 3.3 0.42 0.21 0.16 0.21 3.73 22 110 1.83 3.1 0.39 0.21 0.15 0.19 3.28 23 115 1.92 2.9 0.37 0.21 0.14 0.16 2.84 24 120 2.00 3.0 0.38 0.21 0.14 0.18 3.06 25 125 2.08 3.1 0.39 0.21 0.15 0.19 3.28 26 130 2.17 4.2 0.53 0.21 0.20 0.33 5.72 27 135 2.25 5.0 0.64 0.21 0.24 0.43 7.50 28 140 2.33 3.5 0.45 0.21 0.17 0.24 4.17 29 145 2.42 6.8 0.86 0.21 0.32 0.66 11.50 30 150 2.50 7.3 0.93 0.21 0.34 0.72 12.61 31 155 2.58 8.2 1.04 0.21 0.39 0.84 14.61 32 160 2.67 5.9 0.75 0.21 0.28 0.54 9.50 33 165 2.75 2.0 0.25 0.21 0.09 0.05 0.84 34 170 2.83 1.8 0.23 0.21 0.08 0.02 0.39 35 175 2.92 1.8 0.23 0.21 0.08 0.02 0.39 36 180 3.00 0.6 0.08 0.21 0.03 0.05 0.84 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in) RAINFALL VOLUME (cuff) SOIL LOSSES (cuff) EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 1.06 66,621 32,123 0.55 0.79 34,498 14.61 Plate E-2.2 3 -Hour Storm Page 5 of 9 RCFC & WCD MUDQMdICD@U GLIA IMUl°. d SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM PROJECT: CORAL MOUNTAIN Job No.: 2553 DATE BY: DLS 3/30/20 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 17.31 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.89 UNIT TIME -PERCENT OF LAG 128.6 TOTAL ADJUSTED STORM RAIN -INCHES 1.36 CONSTANT LOSS RATE-in/hr 0.206 LOW LOSS RATE - PERCENT 37% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 5 0.08 0.5 0.082 0.21 0.03 0.05 0.90 2 10 0.17 0.6 0.098 0.21 0.04 0.06 1.08 3 15 0.25 0.6 0.098 0.21 0.04 0.06 1.08 4 20 0.33 0.6 0.098 0.21 0.04 0.06 1.08 5 25 0.42 0.6 0.098 0.21 0.04 0.06 1.08 6 30 0.50 0.7 0.114 0.21 0.04 0.07 1.25 7 35 0.58 0.7 0.114 0.21 0.04 0.07 1.25 8 40 0.67 0.7 0.114 0.21 0.04 0.07 1.25 9 45 0.75 0.7 0.114 0.21 0.04 0.07 1.25 10 50 0.83 0.7 0.114 0.21 0.04 0.07 1.25 11 55 0.92 0.7 0.114 0.21 0.04 0.07 1.25 12 60 1.00 0.8 0.131 0.21 0.05 0.08 1.43 13 65 1.08 0.8 0.131 0.21 0.05 0.08 1.43 14 70 1.17 0.8 0.131 0.21 0.05 0.08 1.43 15 75 1.25 0.8 0.131 0.21 0.05 0.08 1.43 16 80 1.33 0.8 0.131 0.21 0.05 0.08 1.43 17 85 1.42 0.8 0.131 0.21 0.05 0.08 1.43 18 90 1.50 0.8 0.131 0.21 0.05 0.08 1.43 19 95 1.58 0.8 0.131 0.21 0.05 0.08 1.43 20 100 1.67 0.8 0.131 0.21 0.05 0.08 1.43 21 105 1.75 0.8 0.131 0.21 0.05 0.08 1.43 22 110 1.83 0.8 0.131 0.21 0.05 0.08 1.43 23 115 1.92 0.8 0.131 0.21 0.05 0.08 1.43 24 120 2.00 0.9 0.147 0.21 0.05 0.09 1.61 25 125 2.08 0.8 0.131 0.21 0.05 0.08 1.43 26 130 2.17 0.9 0.147 0.21 0.05 0.09 1.61 27 135 2.25 0.9 0.147 0.21 0.05 0.09 1.61 28 140 2.33 0.9 0.147 0.21 0.05 0.09 1.61 29 145 2.42 0.9 0.147 0.21 0.05 0.09 1.61 30 150 2.50 0.9 0.147 0.21 0.05 0.09 1.61 31 155 2.58 0.9 0.147 0.21 0.05 0.09 1.61 32 160 2.67 0.9 0.147 0.21 0.05 0.09 1.61 33 165 2.75 1.0 0.163 0.21 0.06 0.10 1.79 34 170 2.83 1.0 0.163 0.21 0.06 0.10 1.79 35 175 2.92 1.0 0.163 0.21 0.06 0.10 1.79 36 180 3.00 1.0 0.163 0.21 0.06 0.10 1.79 37 185 3.08 1.0 0.163 0.21 0.06 0.10 1.79 38 190 3.17 1.1 0.180 0.21 0.07 0.11 1.97 39 195 3.25 1.1 0.180 0.21 0.07 0.11 1.97 40 200 3.33 1.1 0.180 0.21 0.07 0.11 1.97 41 205 3.42 1.2 0.196 0.21 0.07 0.12 2.15 42 210 3.50 1.3 0.212 0.21 0.08 0.01 0.10 43 215 3.58 1.4 0.228 0.21 0.08 0.02 0.39 44 220 3.67 1.4 0.228 0.21 0.08 0.02 0.39 45 225 3.75 1.5 0.245 0.21 0.09 0.04 0.67 46 230 3.83 1.5 0.245 0.21 0.09 0.04 0.67 47 235 3.92 1.6 0.261 0.21 0.10 0.05 0.96 48 240 4.00 1.6 0.261 0.21 0.10 0.05 0.96 49 245 4.08 1.7 0.277 0.21 0.10 0.07 1.24 50 250 4.17 1.8 0.294 0.21 0.11 0.09 1.53 51 255 4.25 1.9 0.310 0.21 0.11 0.10 1.81 52 260 4.33 2.0 0.326 0.21 0.12 0.12 2.10 53 265 4.42 2.1 0.343 0.21 0.13 0.14 2.38 54 270 4.50 2.1 0.343 0.21 0.13 0.14 2.38 Plate E-2.2 6 -Hour Storm Page 6 of 9 RCFC & WCD MUDQEDdICD@U GLIA °I.IMUS° , SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM PROJECT: CORAL MOUNTAIN Job No.: 2553 DATE BY: DLS 3/30/20 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 17.31 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.89 UNIT TIME -PERCENT OF LAG 128.6 TOTAL ADJUSTED STORM RAIN -INCHES 1.36 CONSTANT LOSS RATE-in/hr 0.206 LOW LOSS RATE - PERCENT 37% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 55 275 4.58 2.2 0.359 0.21 0.13 0.15 2.67 56 280 4.67 2.3 0.375 0.21 0.14 0.17 2.95 57 285 4.75 2.4 0.392 0.21 0.15 0.19 3.24 58 290 4.83 2.4 0.392 0.21 0.15 0.19 3.24 59 295 4.92 2.5 0.408 0.21 0.15 0.20 3.52 60 300 5.00 2.6 0.424 0.21 0.16 0.22 3.81 61 305 5.08 3.1 0.506 0.21 0.19 0.30 5.23 62 310 5.17 3.6 0.588 0.21 0.22 0.38 6.65 63 315 5.25 3.9 0.636 0.21 0.24 0.43 7.51 64 320 5.33 4.2 0.685 0.21 0.25 0.48 8.36 65 325 5.42 4.7 0.767 0.21 0.28 0.56 9.79 66 330 5.50 5.6 0.914 0.21 0.34 0.71 12.35 67 335 5.58 1.9 0.310 0.21 0.11 0.10 1.81 68 340 5.67 0.9 0.147 0.21 0.05 0.09 1.61 69 345 5.75 0.6 0.098 0.21 0.04 0.06 1.08 70 350 5.83 0.5 0.082 0.21 0.03 0.05 0.90 71 355 5.92 0.3 0.049 0.21 0.02 0.03 0.54 72 360 6.00 0.2 0.033 0.21 0.01 0.02 0.36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in) RAINFALL VOLUME (cuft) SOIL LOSSES (cuft) EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 1.36 85,476 39,734 0.73 1.05 45,742 12.35 Plate E-2.2 6 -Hour Storm Page 7 of 9 RCFC & WCD IIVE)172O1©12U GLIA °�, � J/R d SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM PROJECT: CORAL MOUNTAIN Job No.. 2553 DATE: BY: DLS 3/30/20 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 17.314 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.89 UNIT TIME -PERCENT OF LAG 385.7 TOTAL ADJUSTED STORM RAIN -INCHES 2.23 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.2064 MINIMUM LOSS RATE (for var. loss) - in/hr 0.103 LOW LOSS RATE - DECIMAL 0.37 C 0.00191 Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 15 0.25 0.2 0.018 0.364 0.007 0.011 0.20 2 30 0.50 0.3 0.027 0.360 0.010 0.017 0.29 3 45 0.75 0.3 0.027 0.356 0.010 0.017 0.29 4 60 1.00 0.4 0.036 0.352 0.013 0.022 0.39 5 75 1.25 0.3 0.027 0.348 0.010 0.017 0.29 6 90 1.50 0.3 0.027 0.344 0.010 0.017 0.29 7 105 1.75 0.3 0.027 0.339 0.010 0.017 0.29 8 120 2.00 0.4 0.036 0.335 0.013 0.022 0.39 9 135 2.25 0.4 0.036 0.331 0.013 0.022 0.39 10 150 2.50 0.4 0.036 0.327 0.013 0.022 0.39 11 165 2.75 0.5 0.045 0.323 0.017 0.028 0.49 12 180 3.00 0.5 0.045 0.319 0.017 0.028 0.49 13 195 3.25 0.5 0.045 0.315 0.017 0.028 0.49 14 210 3.50 0.5 0.045 0.311 0.017 0.028 0.49 15 225 3.75 0.5 0.045 0.308 0.017 0.028 0.49 16 240 4.00 0.6 0.054 0.304 0.020 0.034 0.59 17 255 4.25 0.6 0.054 0.300 0.020 0.034 0.59 18 270 4.50 0.7 0.062 0.296 0.023 0.039 0.69 19 285 4.75 0.7 0.062 0.292 0.023 0.039 0.69 20 300 5.00 0.8 0.071 0.288 0.026 0.045 0.78 21 315 5.25 0.6 0.054 0.285 0.020 0.034 0.59 22 330 5.50 0.7 0.062 0.281 0.023 0.039 0.69 23 345 5.75 0.8 0.071 0.277 0.026 0.045 0.78 24 360 6.00 0.8 0.071 0.274 0.026 0.045 0.78 25 375 6.25 0.9 0.080 0.270 0.030 0.051 0.88 26 390 6.50 0.9 0.080 0.266 0.030 0.051 0.88 27 405 6.75 1.0 0.089 0.263 0.033 0.056 0.98 28 420 7.00 1.0 0.089 0.259 0.033 0.056 0.98 29 435 7.25 1.0 0.089 0.256 0.033 0.056 0.98 30 450 7.50 1.1 0.098 0.252 0.036 0.062 1.08 31 465 7.75 1.2 0.107 0.249 0.040 0.067 1.18 32 480 8.00 1.3 0.116 0.245 0.043 0.073 1.27 33 495 8.25 1.5 0.134 0.242 0.050 0.084 1.47 34 510 8.50 1.5 0.134 0.239 0.050 0.084 1.47 35 525 8.75 1.6 0.143 0.235 0.053 0.090 1.57 36 540 9.00 1.7 0.152 0.232 0.056 0.095 1.67 37 555 9.25 1.9 0.169 0.229 0.063 0.107 1.86 38 570 9.50 2.0 0.178 0.225 0.066 0.112 1.96 39 585 9.75 2.1 0.187 0.222 0.069 0.118 2.06 40 600 10.00 2.2 0.196 0.219 0.073 0.123 2.16 41 615 10.25 1.5 0.134 0.216 0.050 0.084 1.47 42 630 10.50 1.5 0.134 0.213 0.050 0.084 1.47 43 645 10.75 2.0 0.178 0.210 0.066 0.112 1.96 44 660 11.00 2.0 0.178 0.207 0.066 0.112 1.96 45 675 11.25 1.9 0.169 0.203 0.063 0.107 1.86 46 690 11.50 1.9 0.169 0.200 0.063 0.107 1.86 47 705 11.75 1.7 0.152 0.198 0.056 0.095 1.67 48 720 12.00 1.8 0.161 0.195 0.060 0.101 1.76 49 735 12.25 2.5 0.223 0.192 0.083 0.031 0.55 50 750 12.50 2.6 0.232 0.189 0.086 0.043 0.75 51 765 12.75 2.8 0.250 0.186 0.093 0.064 1.11 52 780 13.00 2.9 0.259 0.183 0.096 0.076 1.32 53 795 13.25 3.4 0.303 0.180 0.112 0.123 2.15 54 810 13.50 3.4 0.303 0.178 0.112 0.126 2.19 55 825 13.75 2.3 0.205 0.175 0.076 0.030 0.53 56 840 14.00 2.3 0.205 0.172 0.076 0.033 0.57 57 855 14.25 2.7 0.241 0.170 0.089 0.071 1.24 58 870 14.50 2.6 0.232 0.167 0.086 0.065 1.13 59 885 14.75 2.6 0.232 0.165 0.086 0.067 1.18 60 900 15.00 2.5 0.223 0.162 0.083 0.061 1.06 61 915 15.25 2.4 0.214 0.160 0.079 0.055 0.95 62 930 15.50 2.3 0.205 0.157 0.076 0.048 0.84 63 945 15.75 1.9 0.169 0.155 0.063 0.015 0.26 Plate E-2.2 24 Hour Storm Page 8 of 9 RCFC & WCD IIVIDQOdCD@U GLIA °�, � J/R d SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM PROJECT: CORAL MOUNTAIN Job No.. 2553 DATE: BY: DLS 3/30/20 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 17.314 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.89 UNIT TIME -PERCENT OF LAG 385.7 TOTAL ADJUSTED STORM RAIN -INCHES 2.23 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.2064 MINIMUM LOSS RATE (for var. loss) - in/hr 0.103 LOW LOSS RATE - DECIMAL 0.37 C 0.00191 Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 64 960 16.00 1.9 0.169 0.152 0.063 0.017 0.30 65 975 16.25 0.4 0.036 0.150 0.013 0.022 0.39 66 990 16.50 0.4 0.036 0.148 0.013 0.022 0.39 67 1005 16.75 0.3 0.027 0.145 0.010 0.017 0.29 68 1020 17.00 0.3 0.027 0.143 0.010 0.017 0.29 69 1035 17.25 0.5 0.045 0.141 0.017 0.028 0.49 70 1050 17.50 0.5 0.045 0.139 0.017 0.028 0.49 71 1065 17.75 0.5 0.045 0.137 0.017 0.028 0.49 72 1080 18.00 0.4 0.036 0.135 0.013 0.022 0.39 73 1095 18.25 0.4 0.036 0.133 0.013 0.022 0.39 74 1110 18.50 0.4 0.036 0.131 0.013 0.022 0.39 75 1125 18.75 0.3 0.027 0.129 0.010 0.017 0.29 76 1140 19.00 0.2 0.018 0.127 0.007 0.011 0.20 77 1155 19.25 0.3 0.027 0.125 0.010 0.017 0.29 78 1170 19.50 0.4 0.036 0.124 0.013 0.022 0.39 79 1185 19.75 0.3 0.027 0.122 0.010 0.017 0.29 80 1200 20.00 0.2 0.018 0.120 0.007 0.011 0.20 81 1215 20.25 0.3 0.027 0.119 0.010 0.017 0.29 82 1230 20.50 0.3 0.027 0.117 0.010 0.017 0.29 83 1245 20.75 0.3 0.027 0.116 0.010 0.017 0.29 84 1260 21.00 0.2 0.018 0.114 0.007 0.011 0.20 85 1275 21.25 0.3 0.027 0.113 0.010 0.017 0.29 86 1290 21.50 0.2 0.018 0.112 0.007 0.011 0.20 87 1305 21.75 0.3 0.027 0.110 0.010 0.017 0.29 88 1320 22.00 0.2 0.018 0.109 0.007 0.011 0.20 89 1335 22.25 0.3 0.027 0.108 0.010 0.017 0.29 90 1350 22.50 0.2 0.018 0.107 0.007 0.011 0.20 91 1365 22.75 0.2 0.018 0.106 0.007 0.011 0.20 92 1380 23.00 0.2 0.018 0.105 0.007 0.011 0.20 93 1395 23.25 0.2 0.018 0.105 0.007 0.011 0.20 94 1410 23.50 0.2 0.018 0.104 0.007 0.011 0.20 95 1425 23.75 0.2 0.018 0.104 0.007 0.011 0.20 96 1440 24.00 0.2 0.018 0.103 0.007 0.011 0.20 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in) RAINFALL VOLUME (cuft) SOIL LOSSES (cuft) EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW (cfs) 2.23 140,156 73,692 1.06 1.53 66,464 2.19 Plate E-2.2 24 Hour Storm Page 9 of 9 0.031 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER March 30, 2020 DLS 1 CORAL MOUNTAIN 2553 10 YEAR BASIN DA -A3 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 11 D 12 B 2 B 3 B 1 B 6 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT EXISTING BARREN 1.268 X 93 0.09 0.05 EXISTING OPEN BRUSH - POOR 4.870 X 76 0.29 0.05 PAVING/HARDSCAPE 0.011 D 56 0.51 1.00 WATER FEATURE 0.000 D 56 0.51 1.00 COMMERCIAL 0.000 D 56 0.51 0.90 SF - HIGH DENSITY 0.000 D 56 0.51 0.50 LANDSCAPING 18.819 D 56 0.51 0.10 LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION 1,050 ft 525 ft 520.0 ft 472.0 ft 10 85% 14 0.71 in 1.06 in 1.36 in 2.23 in ELEVATION AREA 468.0 ft 10,730 sf 469.0 ft 17,060 sf 470.0 ft 24,025 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD r[�i VoDG30o LOo W 1�1u �%NIIIIIL%d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 3/30/20 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 96,072 69,661 10 YEAR BASIN [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -A3 [3] AREA - ACRES 0.30 24.968 [4] L -FEET 31,717 0.73 1050 [5] L -MILES 32,470 0.75 0.199 [6] La -FEET 23,026 0.53 1.49 525.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.099 [8] ELEVATION OF HEADWATER n/a 520 [9] ELEVATION OF CONCENTRATION POINT 1.23 472 [10] H -FEET 469.45 1.45 48 [11] S-FEET/MILE LOWEST FLOW LINE ELEVATION DIFFERENCE (ft) 241.4 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 15.54 [13] L*LCA/S^0.5 0.001 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.03 [15] LAG TIME -HOURS 1.0 0.06 [16] LAG TIME -MINUTES 3.4 [17] 100% OF LAG -MINUTES 3.4 [18] 200% OF LAG -MINUTES 6.9 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 10 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 0.71 in 3 -HOUR 1.06 in 6 -HOUR 1.36 in 24-HOUR 2.23 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR ' 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 64,441 32,724 96,072 69,661 123,263 96,384 202,114 169,645 EFFECTIVE RAIN (in) 0.35 0.29 0.30 0.36 FLOOD VOLUME (cu -ft) (acre -ft) 31,717 0.73 26,411 0.61 26,879 0.62 32,470 0.75 _ REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 30,493 0.70 1.12 23,026 0.53 1.49 20,546 0.47 1.67 14,184 0.33 2.41 STORAGE PROVIDED (cu -ft) (acre -ft) 34,217 0.79 PEAK FLOW (cfs) n/a 15.98 12.73 1.23 MAXIMUM WSEL (ft) DEPTH (ft) 469.82 1.82 469.45 1.45 469.33 1.33 469.02 1.02 LOWEST FLOW LINE ELEVATION DIFFERENCE (ft) LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 1.1 1.0 1.0 1.3 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0457 0.1755 OO o o o o 0000co 0 0 0 0 0000 0 0 0 0 0 0.8393 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00378 (24-(T/60))^1.55 + 0.20 in/hr Undeveloped Condition: Low Loss = 90% II L H H 3 o J J II J H m o J y m -a 8o� m:%> •R 0U)o 0' C G .c > CO WID G m UO. O LOW LOSS RATE PER RCFC/2322 0.9000 0.9000 0.1000 0.1000 0.1800 0.5000 0.8200 LOW LOSS CONDITION UNDEVELOPED UNDEVELOPED DEVELOPED _ DEVELOPED DEVELOPED DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0044 0.0540 0.0000 0.0000 0.0000 0.0000 0.3498 0.4082 AREA WEIGHTED AVERAGE 7, 6NI- ),0 OO 0.000 0.000 0.000 0.000 r O (n W ce Q 0 < 0 0 N N OD ,— 4 — O O 0 0 0 0 O O 0 0 18.819 24.968 SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) o co o N 0 0 0.05 0.05 9Z'0 01'0 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 5% 5% 0 0 O O 0 0 O N O_ 0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] WW CD N 0 o 0.51 0.51 0.51 0.51 0) O RI NUMBER [Plate E-6.1] 00 co Q) N. co co 0) 0) co co 0) 0) c0 0) LAND USE EXISTING BARREN EXISTING OPEN BRUSH - POOR PAVING/HARDSCAPE WATER FEATURE COMMERCIAL SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL=. [I ULM SOIL GROUP [Plate C-1] 0)000000000000 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J W f0 _ 468.02 468.05 468.07 468.10 468.11 468.14 468.21 468.36 468.74 469.75 469.81 469.82 0 C 0.01 0.02 0.02 0.03 0.03 0.04 ,-- .- O .- 0 0 M ,-- N O 0 0 O) O CO 1, 0 0 N F 4i C 0 U 297 655 1,032 1,429 1,489 1,933 2,890 4,936 10,188 29,181 30,258 30,493 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft n A 78 79 80 81 84 91 107 155 CO CO 0 n 78 79 80 81 84 91 107 155 158 158 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM co oc0 0 0 o.- 11,240 11,423 ' 0 LO LO v m 12,097 13,040 15,461 22,362 22,730 22,810 Basin Volume cu -ft r M Mn O rn 7- u, 1,568 2,014 2,974 5,027 10,295 29,337 co - 7 cco o0 co co N E > U co N r co CO a 456 476 139 526 V co O ,- N p C N v M N M co N W ,- M Flood Hydrograph Flow cfs 1.24 _ 1.45 1.52 1.59 0.46 1.75 I'- N M1.: O 17.86 63.83 CO 7.- U) > C U')p t 2 C W 0.05 0.06 N CO 0000 0 0 N r 0 0 0.14 0.28 0.71 2.54 0.16 0.05 Loss Rate in/hr Max 1 Low NM 0 0 M M 0 0 M 0 0 0 0.46 0.58 0.94 2.47 CO N O O 0 0 O O 0.41 0.41 0.41 0.41 0.41 0.41 0.41 0.41 0.41 0.41 Storm Rain in/hr c0 CO CO 0 0 0.38 0.39 co co 00 0 0 N W 0 0 0 0.- N 7 6) . N I- N Nco o 0 RCFC & WCD NIG1Gfl. IMIL DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 145.8 TOTAL ADJUSTED STORM RAIN -INCHES 0.71 CONSTANT LOSS RATE-in/hr 0.41 LOW LOSS RATE - PERCENT 83.93% Pattern Percent (Plate E-5.9) 3.6 4.2 4.4 4.6 0 0 00 6.4 8.1 13.1 34.5 r co 6M Time Minutes Hours ON- O 0 0 N CO N CO 0 0 0.42 0.50 0 1- LO 0 0 0 LO 0 1� CO 0 0 N 0 O) O 0 0 oO LoN 25 30 35 40 45 50 55 _ 60 Unit Time Period N- 0 M V lO (0 I- 0 O) o`- N 0 0 0 c00000,�n 0 0 n U >.,..: U 0 M M 0 O 0 W M U 0 Q O- I� N O, O cp oq N4' U ON 7a ai 2`44' 2 co 4. cocoM 0 N 7 co CO W 2 7 J O W G Q o w o z J 0 LL W W co ~ Z W U' U` W co J R J D z W W O O I O O re III ZoWcc>?�y ,ZW f J U)>>> W W w o c 0 W< W O W00== 3 Y Q< LL r Z J LL O O O 0 X< F W W 0 0 O W u_ u_ W W 2 a 1- Q PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W co m 468.01 468.02 468.03 468.04 468.05 468.06 468.07 468.09 468.10 468.11 468.13 468.14 468.16 468.18 468.20 468.21 468.23 468.26 468.28 468.30 468.30 468.33 468.36 468.38 468.41 5 0 C To N O 0 C) 0 0 0 C) 0 0 0.02 0.02 0.02 0.03 0.03 0.04 a s O O O O 0.05 0.06 CO f� O O O O 0.07 0.08 CO O O 0 0 O O 0 0 O T- CI CO 0 0 0 Om @ C O (O N c N 344 500 654 855 1,008 1,207 1,406 1,558 1,724 1,921 2,179 2,436 (0 0) O O N N. 3,233 3,564 3,847 4,176 4,175 4,564 4,921 5,292 5,678 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 75 76 CO (O r- r- 77 77 CO 0) r- r- 79 80 80 81 N M (o co CO 7 co cm 85 86 r co corn 88 89 N CO 0))00 75 76 79 80 80 81 82 83 83 84 85 86 87 88 88 89 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CD N W CO CO ad 10,923 10,995 11,066 11,158 11,229 11,321 CO CO a s 11,559 11,650 Cr, CO CO 00 f� CO. 12,006 12,109 12,255 12,407 M0) CD N CO N N 12,689 12,869 MO W O N CO civic.; Basin Volume cu -ft (O CD M 420 576 N CON CO O 1,086 1,286 CO 7 CO 1,805 2,002 2,261 2,519 2,776 3,001 3,318 3,650 3,934 4,264 M M N (OO V V CO O CO N. 0 O (O a) E 3 s O 0 > OO N N 170 232 232 278 232 278 278 232 247 278 340 340 340 309 401 417 370 417 87 478 448 463 478 Flood Hydrograph Flow cfs I. r 00LO 0 0 r r f-n0n0) 0 0 n CO 0 0 n CO 0 0 CO r Or- 0 0 0.82 0.93 CO CO CO CO T - o 1.34 1.39 CO 0) CI co 0.29 1.59 1.49 1.54 1.59 Effective Rain in/hr 0.03 0.03 00 00 0.03 0.04 0.03 0.04 0.04 0.03 0.03 0.04 00 00 0.04 0.04 0.05 0.06 0.05 0.06 oo 00000 ooo Loss Rate in/hr Max 1 Low nr fl N_ O O (O O O (O 0) O O (O 0) O O 0) (O O O r 0) O O CO CO N N O O CO N N O O 0.28 0.29 CO 0) 0)0)0)0)0)0)0) 0 0 (0 CO 0 0 N CO 0 0 0 a 7 . . 0 0 a 7 . . 0 0 a 7 . . 0 0 a 7 . . 0 0 a 7 . . 0 0 a 7 . . 0 0 a 7 . . 0 0 a 7 . . 0 0 6 7 . . 0 0 6 7 . . 0 0 6 7 . . 0 0 6 7 6 . . . 0 0 0 Storm Rain in/hr . 0 0 0 0 N 0 0 N 0 0 0.23 0.19 0.20 0.23 N N O O 0.28 0.25 M M O O M 0) . O O 0.42 0.39 0.37 0.38 0.39 RCFC & WCD MUDDI3o©I1= Ctrl FACACME DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 145.8 TOTAL ADJUSTED STORM RAIN (in) 1.06 CONSTANT LOSS RATE (in/hr) 0.41 LOW LOSS RATE - PERCENT 83.93% Pattern Percent (Plate E-5.9) M M (0 O W (n (0 1.8 1.5 (O CO. T- T- N N N N 2.2 2.0 CO r N NCV V r N M,- M M 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 QN)O O7 CcoO. 1.42 1.50 1.58 1.67 r00 1.92 2.00 2.08 _ 5 10 15 20 N M 35 40 45 50 55 60 65 70 75 80 OBD 0) O Off)CD _ 105 110 (0 O ( 0 T- v- T- Unit Time Period N CO 0 0 N. W O N 15 16 T- T- N 19 20 21 22 N 0 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm u 468.47 468.59 468.60 468.85 469.08 469.31 469.43 469.44 469.45 469.45 469.45 0.15 0.19 0.36 0.46 0.52 0.52 0.53 0.53 0.53 =[}}CO\ ifi ea 15,476 20,137 22,583 22,751 22,889 23,026 22,978 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 101 112 col co 140 140 140 141 141 101 112 140 140 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 7113,777 4,524 14,606 16,144 LO 01 20,109 20,167 20,213 20,260 20,244 Basin Volume cu -ft 6,630 8,254 CO 07, CO 15,599 20,271 22,722 22,892 23,029 23,167 23,119 (_ D`°»co 279 3,450 3,930 4,795 2,585 309 278 278 93 Flood Hydrograph Flow cfs _ 3.17 5.73 0.93 11.50 13.10 15.98 8.62 1.03 to co0 Effective Rain in/hr 0.13 0.23 0.34 0.04 Loss Rate in/hr Max L Low 0.45 0.53 0.78 0.88 0.41 0.41 Storm Rain in/hr 0.53 0.64 0.45 0.86 0.93 1.04 0.75 0.25 0.23 0.23 0.08 RCFC & WCD GOO oDD o@E Ctrl FACACME DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 145.8 TOTAL ADJUSTED STORM RAIN (in) 1.06 CONSTANT LOSS RATE (in/hr) 0.41 LOW LOSS RATE - PERCENT 83.93% Pattern Percent (Plate E-5.9) 3.5 6.8 5.9 2.0 Time Minutes Hours 2.50 2.58 2.67 2.75 LON 140 _ 145 150 _ 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 CO 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY co �\\�\\\\\\\\ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J CO m 468.00 468.00 468.01 468.01 468.01 468.02 468.02 468.03 468.03 468.04 468.04 468.05 468.05 468.06 468.07 468.07 468.08 468.08 468.09 468.09 468.10 468.11 W T -CA cd ai V 7 U000000 N C C N 0.00 0.00 0.00 0.00 0 0 0 0 0 0 0.01 0.02 0.02 0.02 0.02 0.02 O O O O 0.03 0.03 0.03 0.03 O O O O Om @ O CN M- N O N LO L CO N 0) (O N (0 I,- N N M M 0 N (O 0 (n Cr LO 1� 2 (O (0 1.-- W M P. W 0)00000 0) 1- W 0) O M N N co r M V 07 u `.° - Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 75 75 75 75 LO n N. n N. n N. 77 77 77 77 78 78 78 78 r N. r N. 80 80 (O (O N. N. 0) (O r r 0) (0 r r CO (0 r r CO CO r r N.. N. r r P- N.. r r C00000000) r r r r 0 r r 0) 0 r r OO CO M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 10,776 10,796 CO CO CO C000 66 10,856 10,885 V co V MO/ 66 10,972 11,000 11,029 11,067 11,104 11,141 (Duo h T -N co O (O O) N_ N_ COCO CV CO CO_ M_ 11,400 _ 11,436 11,518 N C E m; 0 t M SI T- h CO M N V I� h M N co O M O (O V V O W N (0 (O (O O N (O M (0 N. V (O O aD CO (O i( C0 O O M_ O N r N M N 7 N E 0) = C O O U > O O O O O O ,- 0) 139 139 139 139 139 158 (0 co 10 � 158 158 158 158 158 158 158 158 178 Flood Hydrograph Flow cfs 0.33 0.40 0 0 7 V O O 0.40 0.46 0.46 0.46 0.46 0.46 CO CO 7 (O O O CO CO (O (O O O CO CO (O LO O O CO CO IO LO O O CO CO IO LO O O CO CO IO LO O O CO 0) IO LO O O N C U '(p L m Q' s W N O o O (J N N o o O (J N N o o O (J N N o o O (J N N o o O (J N N o o O (J N N 0 0 O (J N N 0 0 O 0 N N 0 0 O CJ N N 0 0 O CJ N N 0 0 O CJ N N o 0 O CJ Loss Rate in/hr Max 1 Low 0.07 _ 0.08 0.08 0.08 co O O 0 O O 0 0 O O 0 0 O r__________ 0 0 0 0 0 0 0 0 0 0 0 0 0 T- CA 0 0 a a 0 0 a a 0 0 a a 0 0 a a 0 0 a a 0 0 a a 0 0 a a 0 0 a a 0 0 a a 0 0 a a 0 0 a a 0 0 a 0 a. 0 Storm Rain in/hr 0 0 O r O O 0 0 O O 0 O O O O O O T- CO O O CO CO O O CO CO O O CO CO O O CO CO O O CO CO O O 0.15 RCFC & WCD MUDDI3o©I1= Ctrl DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 145.8 TOTAL ADJUSTED STORM RAIN (in) 1.36 CONSTANT LOSS RATE (in/hr) 0.41 LOW LOSS RATE - PERCENT 83.93% O C C 4 ids) U UJ N a a m 0 Oc0 O CD c0 co. CD N. co. CD n1` O CD n1` O CD n(0 O CD W (0 O CD CO (000 O CJ (000 O CJ (000 O CJ (0000 O CJ O CJ Time Minutes Hours CO a- O O 0.25 0.33 0.42 0.50 (OO CO(0 O O 0.75 0.83 ON) O O T- O 7 T- T- N CO T- T- 1.42 1.50 1.58 1.67 1.75 1.83 MEM 2.00 O M 0) O T- N 0) O N M (O O co a (O O a (tor o (O O (O (O 0) O (0 1s 0) O O 0) O CO(0 (0 00 0 cD cD 0) CD cD 0) CD Unit Time Period T- N CO V (O O r CO O O N 7P.. 15 16 CO Mm Mm O O Mm N Mm N N N M V N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm W _ o w m N `- 10QDCO 7 468.14 468.15 468.15 468.16 468.17 468.17 468.18 468.19 468.20 468.21 NN 0 7 7 NN CO 4040 7 7 468.25 468.27 468.28 468.29 MM 40 V 7 COM 40 40 V 7 _ 468.38 I 468.40 w U CO C C N 77 0 0 0 0 a 10 0 0 0 0 (0 10 0 0 0 0 (0 10 0 0 0 0 (D (O 0 0 0 0 (D I- 0 0 0 0 I- I-N1O 0 0 0 0 0 0 0 0 ODCO0)0) 0 0 0 0 0 CD 0 0 OO_ 0 0 T - T -N_ 0 0 N_ 0 0 Om @ S O () N O1- I� O - s --0-(V V O0 0 01 -MO 0 02 ( 0N M (V ( NO O0) N O (V ( t`10NO (V ( (V C) NM M C) 0-(0 M C) W O M Ni 0-7000) V Ni V 70)10 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft W CO 81 81 81 82 OND CO 83 83 84 84 84 85 85 86 86 87 87 88 88 89 1.6 06 O 00)) O CO W CO W N CO W 82 82 CO CO CO CO 84 84 84 85 85 86 86 87 87 88 88 89 O O) 0) N O) 0) SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C O (0 (0 0 d y i Q 0 V 0) 0) 0) (n L0 a CO a CO O M CO r CO r 1` r• NCO N CO M 00 0) N r 01 0) — N r N r O O N N 0 CO 0) ,- N rsi CO VCO (D N CO csi c N0 CO CO co V rsi N. N. (0 CO co co N. CO 0) CO N n co N. VCO CO CO W Oa- M CO (0 r N M M Basin Volume cu -ft 1.792 1,890 1,988 2,085 2,182 2,279 CO N I,- N. CO V N N 2,587 2,703 I- N a- CO CO 0) N N 3,046 3,180 3,313 3,446 3,598 3,769 3,960 4,150 4,359 4,568 4,796 5,023 5,269 5,534 0) E w C j O U > M co 1() I- e- co 0o N. 1- T- T- co 0o N. I- T- T- co 0o N. 1- T- T- co 0o 0) 0) T- T- co 0o O 0) T- T- co 0o O T- N co oo N N co I- CO 10 N N I- I- r N. N N I- I- 0) 0) N N I- I- CO CO I- (o CO 10 CO CO Flood Hydrograph Flow cfs 0.53 0.59 0.59 0.59 0.59 0.59 0.59 0.59 (O (o O (o 0 0 (O (O OD O 0 6666666 (O CO O r CO CO I- I- 0 (o I- W 0.92 0.92 O 0) MMqq77 0 0', (O CO N 0) x,— d C s QC W CO N 0 0 N N 0 0 N N 0 0 N N 0 0 M OM 0 0 M OM 0 0 M OM 0 0 M M 0 0 M M 0 0 7 a 0 0 7 a 0 0 7 a 0 0 7 O 0 0 Loss Rate in/hr Max I Low 0.11 0.12 N_ N_ O O N_ N_ O O N_ N_ O O 10 10 O O 10 10 O O 10 0) O O 0.15 0.15 O CO'--'--0)0)0)0)0)0)CO 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ',-a-- 0 0 Storm Rain in/hr 0.13 0.15 (0 O O O (0 O O O (0 O O O CO (O O O CO (O O O CO W O O CO N O O 0.20 0.21 0.23 0.23 N N O O 0.26 0.26 0.28 0.29 RCFC & WCD GOO DDD o@E Ctrl NIGICML \E DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 145.8 TOTAL ADJUSTED STORM RAIN (in) 1.36 CONSTANT LOSS RATE (in/hr) 0.41 LOW LOSS RATE - PERCENT 83.93% T C C O ID. V W 75 O 0- 0 0 m FL W O) 0 0 OO) 0 0 OO) 0 0 OO) 0 CD OOOOO T- T- T- T- T- T- 7 T- T- NM T- T- 7 T- T- W. W. T- T- OO1` T- T- T- Time Minutes Hours 2.08 2.17 N CO N N 2.42 2.50 2.58 2.67 LO 0- CO N N 2.92 3.00 3.08 3.17 N CO M co) 3.42 3.50 3.58 3.67 r CO M co) 3.92 4.00 4.08 4.17 (0 O 0)0)0)10100)U)(000 T- (0 O (0 O T- (0 O T- T- (0 O -N-(0(00000040)0)40101010 T- T- (0 O T- T- (0 O T- T- (0 O T- 0)0)0)0)0)0)0)0)0)0)0) (0 O (0 O (0 O (0 O (0 O Unit Time Period (n C0 N N 1- CO N N 29 30 31 32 M a M M 35 36 I- CO M M 39 40 41 42 M a V V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm cw On 468.42 468.44 468.46 468.48 468.51 468.53 468.56 468.59 468.62 468.62 468.67 468.76 468.87 469.01 469.14 469.32 469.33 469.33 469.33 469.33 469.33 469.32 10 O . N C To N CO 0 O O N O O O 0 r O O CO 0) N O O 0 0 N N O O 7 N N O O CO N N M O O CO r CO 7 O O r r 7 O O 0 r r 7 7 O 0 r 1,- 7 7 0 0 O 2 U (n r ---r fN� N u5 Or66 t` �O (OM O (MO I,:^ OM f.2M- I,: c6 (0(00 O N CO CO Q (O V OjO N-0(ON O 0) c`vi 1! (00000000 N M0N ul N N 000 V N N NI- M N N Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft M 7In0) O) W Cn d1 0)0)0000 O) d1 104 108 M0) ,_ r 01 0) 0)0) 0)0) 135 134 M 7 0 0^ 0 0 0 0 0 0 0 M 0) N M M M M M M M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 0 7 7 N 0 M 01 M CO CO MM 13,994 14,159 M 0 CO N 77 14,686 14,695 14,987 15,562 16,305 17,175 18,058 19,316 0 a- CO 7 0)0 19,408 _ 19,396 19,370 19,338 Basin Volume cu -ft 5.818 6,121 6,443 6,763 7,103 7,461 7,838 8,214 8,608 8,628 N LO O M , 16,702 20,396 OO 0 Ca - N N 20,665 20,630 20,554 20,459 N E 0 O E j U (0 (0 I� Cr) M M 0 f0 7 7 0 10 CO (0 7 7 10 10 h- r 7 7 10 N 0)N 7 CO M0) I� .-.- N g IS 000 N O N N C O O N- N- M 01 O a - (3.5M7 O O Flood Hydrograph Flow cfs N M a- .- (00 M .- .- 1.45 1.52 1.58 1.58 1.65 0.41 7 10 N Ni: 5.75 6.98 M CO r 6 '4 N 0 O 0.40 0.33 0.20 _ 0.13 > C :11 U) .% s g Q' C W 10100000881301 o 000000000 0 0 0 0 0 0 0 0 0 0 0 0 �� 0 0 MCO2.-1001 NN 0 0 M 10000000 0 0 0 0 N� 0 0 0 0 Loss Rate in/hr Max I Low 0.26 0.27 N N 0 0 (00 0 0 0 M M 0 0 0.34 0.36 0.42 0.49 0.53 0.58 00 � O O 0.26 _ 0.12 CO O O O 0.04 0.03 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 Storm Rain in/hr 0.31 0.33 MM O O 0.36 0.38 MM 0 0 70100 0 0 0 0 0.64 0.69 ra) O O 0.31 0.15 0.10 0.08 00 O O RCFC & WCD GOO DDD o@E Ctrl DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 145.8 TOTAL ADJUSTED STORM RAIN (in) 1.36 CONSTANT LOSS RATE (in/hr) 0.41 LOW LOSS RATE - PERCENT 83.93% Pattern Percent (Plate E-5.9) 0) O N ,- ,- (V N 2.2 2.3 77 N N 2.5 _ 2.6 3.1 3.6 3.9 4.2 4.7 5.6 00 . O 0.6 0.5 MN O O Time Minutes Hours 10 co N M V 7 N 0 a 0 7 7 CO 13 0 013 a a 10 CO 8 a a N 0 0) 0 a 10 CO 13 0a - 10 10 10 CO N M 10 10 01 0 710 10 10 CO 13 0 0 10 10 10 CO 13 N 10 10 N O O O 10 )0 10 010 0)00N N N O -N.1010000001010000)10100 N N 1OO N N 1OO N N 1OO N CO 1OO CO CO 1OO CO CO 1OO CO CO 1OO CO CO 1OO CO CO 1Oo CO CO Unit Time Period 51 52 53 54 55 56 57 58 0 0 0 0 63 64 10 GO 67 _ 68 O N- n r EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 5 5 5 C V C U V U V r, N CO. QgOIh. .00V OCV CV (p CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.00 468.01 468.01 468.01 468.02 468.03 468.04 468.04 468.06 468.07 0 Nm 468.13 468.15 468.17 468.20 468.23 468.27 468.28 468.30 468.33 Total In Basin cu -ft 1 ac -ft O O O O O O O O O O O O 0.00 0.00 0.00 0.00 OO O O O O 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0 0 0 %N 0 0 0 0 N 0 0 0 0 0., _ 0 0 0.04 0.05 (O CO O O O O 0.07 0.08 0) 0) O 0 0 N. O O O O O O O O O 0 0 0 0 0 0 0 0 0 0 0 N 3 37 m Is 41 74 140 204 300 395 W(0 V O 772 959 1,208 1,456 1,733 2,039 2,407 2,804 3,229 3,682 O O O b c 7 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft IO h (0 O l_ 0 G,010, 1_ r O 0 0,010101 0 0 N N (O (O N N (O (O N 0 (O O 195 226 226 226 226 226 226 226 227 228 229 230 O N M CO N N 233 235 237 240 N (O V V N N 249 253 Ns () (O N N M (O O) (O (O (O N N N V V N N N N V U) N N N N 224 224 224 225 225 225 (O (O N N N N (O (O N N N N (O (O N N N N 225 226 226 226 226 226 226 226 227 228 229 230 230 _ 232 233 235 237 240 242 245 249 253 257 261 M (O O CO m m N N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.20 C 0.00378 Low Loss Rate (percent) 83.93% C U (y p „,(0 y U Q 0 0_ 10,760 10,775 10,775 10,790 10,775 10,775 10,775 10,790 O O O) 0) N r O O 10,805 10,805 10,805 10,805 10,805 10,820 10,820 10,834 10,835 10,851 10,836 10,837 10,853 10,868 10,898 10,928 10,973 11,017 c- 0) (O 7 O 7 11,192 11,279 11,394 11,509 11,638 11,780 11,951 12,135 N N CO V Mu) ,_ ,_ 12,646 12,749 12,925 N C E lNp 2 C U I 65 97 ON. 0, M O O CO O O CO CO N N CO (O N N CO (O 162 195 195 227 229 263 232 233 267 301 367 432 529 625 720 847 1,005 1,194 1,975 2,285 2,656 3,057 3,486 3,943 O N O CO M 1.-- N- V 7 7 Volume In cu -ft 65 97 97 130 r N,, OOO O COCO O O COO N N OD N N OO 162 195 195 227 227 260 195 227 260 260 N N 00)N N N N (O N M CO _ 325 357 390 422 487 487 520 552 617 649 682 714 r n O) CO ma 7 7 m Flood Hydrograph Flow cfs 1.... S. O O O 0.11 _ 0.14 _ O O T- V O O 0.14 0.14 oo _moo 0 0 _moo 0 0 N N N 0 0 0.22 0.25 0.25 0.29 0.22 0.25 0) DI N N 0 0 CV CV M M 0 0 CO CO M M 0 0 CO O M 7 0 0 0.43 0.47 0.54 0.54 OT- 10 CO 0 0 0) N m h 0 0 (O Q) r h 0 0 V 7N IA (O n 0 0 0 Effective Rain in/hr O O O O O O O O O O O 0.00 0.00 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0 N N 0 0 0 0 CA CV CD CD c c N N 0 0 0 0 M M 0 0 0 0 0.03 0.03 N N M 0 0 0 O O O Loss Rate in/hr Max 1 Low 0.015 0.022 0.022 _ 0.030 0.022 0.022 0.022 0.030 0.030 0.030 0.037 0.037 0.037 0.037 0.037 0.045 0.045 0.052 0.052 0.060 0.045 0.052 O O OO m O O O O 0.067 0.067 0.075 0.075 0.075 _ 0.082 O Is O)0) O O O O 0.112 0.112 0.120 0.127 0.142 0.150 r (n Nm O O N N O - - (f) O O O 0.721 0.712 O Om) N- CO O O 0.688 0.680 0.671 0.663 0.655 0.647 0) COOO (O (O O O 0.624 0.616 (O (O O O 0.593 0.585 0.578 0.570 0.563 0.556 0.548 0.541 0.534 0.527 0.520 0.513 _ 0.506 0.499 0.492 0.485 0.479 0.472 0.465 0.459 0.452 0.446 0.439 0.433 N Nv- 7 V 0 0 0 Storm Rain in/hr 0.018 0.027 I- CO N CO O O 0 O O 0.027 0.027 n CD N CO O O O O CO (D CO CO O O O O 0.045 0.045 0.045 0.045 0.045 0.054 0.054 0.062 N 7 CO N- O O O O 0.054 0.062 0.071 0.071 0.080 0.080 0) 0) CO m 0 0 0 0 CO m CO 0) 0 0 0 0 r- CD 0 7 0 0 0.134 0.134 0.143 0.152 Om (D n O O 0.187 0.196 7 CO CO CO N- O O O RCFC & WCD FAzamaL DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 437% TOTAL ADJUSTED STORM RAIN (in) 2.23 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 (O (� O 0 0.7 0.8 (O (� 0 0 0.8 0.8 O O 0 0 O O l T-,, O 7 1.2 1.3 1.5 1.5 (O I: - 1.9 2.0 y- N N N lO (O O T-- N U 2 0.25 0.50 (O O Ns 0 O 1.25 1.50 1.75 2.00 2.25 2.50 (O O I� O N M (O O N m M M 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 _ 7.50 (O O h 0 ^ m 8.25 8.50 N O h 0 m O 9.25 9.50 N O h D) O N (OO Ns O O O Time Minutes 0) 45 60 n 0)O 1n O 135 150 165 180 (f) O ON. N 225 240 255 270 285 300 315 330 345 360 375 390 405 420 _ 435 450 465 480 495 510 525 540 555 570 585 600 (O O (O M7 O(O(D Unit Time Period N M V„ m I. m 0 0 N Cq CO Tr N.N U, m 17 18 19 20 N N CO 7 N N 25 26 27 28 29 _ 30 N Oh CO 33 34 ) m O0h CO 37 38 39 40 N Oh V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J W m 468.35 468.38 468.40 468.42 468.45 468.48 468.52 468.57 468.61 468.67 468.73 468.76 468.79 468.83 468.86 468.90 468.93 468.96 468.99 469.01 469.02 469.01 469.00 468.98 468.96 468.95 468.93 468.92 468.90 468.89 468.87 468.85 468.83 468.82 468.80 468.79 468.77 468.75 468.73 468.72 468.70 468.68 I 468.66 Total In Basin cu -ft ac -ft 0 N CO 0 0 0) 0 0 LO D- 0 0 0.18 0.19 0.21 0.23 0.24 0.25 0.26 0.27 0.28 0.30 0 M M O O NM M M O O NN M M O O 000) M M O O M N O O a) 0) N N O O 0.28 0.28 0.27 0.26 0.26 0.25 0.25 0.24 0.24 0.23 0.23 0.22 0.22 0.21 (`� CO M 7 V N N 0 N u) u)IO 5,832 6,131 6,653 7,202 7,810 8,444 9,233 10,014 10,435 10,851 N u) O) O) M CO c- ,_ ,_ 12,394 12,856 13,281 13,670 13,928 14,184 13,955 13,727 0) CO 0 1 N �� 13,024 12,836 12,650 12,434 12,220 12,009 CO IA CO O) N1 7 ,- ,- ,- 11,257 11,055 10,822 10,559 Ulr M O M Ci Cc CO N CO CO O)O)O)O CO 6) O Ul V Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft C) r N 279 N (O 00 CO N N 290 295 301 307 u) M N M M 327 331 336 341 346 350 354 357 359 361 359 358 356 353 352 350 348 346 V N V V M CO 339 337 335 333 330 328 326 323 321 319 I- V M M 0) r N 279 282 285 290 295 301 307 LO CO N M M D- N CO M M O M V M M 346 350 354 357 359 361 359 358 356 353 352 350 348 346 344 342 339 337 335 333 330 328 326 323 321 319 314 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.20 C 0.00378 Low Loss Rate (percent) 83.93% Percolation Area sf 13,100 13,258 13,415 13,540 13,679 13,921 14,176 14,458 14,752 CO CD N- V (0u) 15,676 15,869 N CO N- 00 (0 (0 00 00) (OD. (0 (0 16,996 17,147 17,235 17,323 17,244 17,166 17,077 16,965 16,877 16,790 16,704 16,604 16,504 16,406 16,294 16,168 16,058 15,963 15,855 15,733 15,628 15,523 15,419 15,301 0 00 .-0 (0 u) C N .N j m; .-- U 0 N 5,500 5,841 O [O (D 6,943 7,497 8,111 8,751 W f� QM O)0 1 10,761 11,181 11,728 12,236 12,739 13,206 13,635 14,028 14,287 14,545 14,314 14,085 13,825 13,566 13,375 13,186 12,998 12,780 12,564 12,350 CO O�01 0(0OMr ,_,_ NN.. ,_,_ NN.. W ,_,- 10,656 10,428 10,202 9,946 9,725 9,473 Volume In cu -ft O0- cOO r (DCO 552 584 N V c0 CO CAN CD 0) 1,104 1,104 747 747 877 844 844 812 779 747 h... h... CDO 130 130 00 NN CD (1:' 162 130 130 130 000 O 0)(00)0)0)(00)(0 Flood Hydrograph Flow cfs 0.72 0) 0)(O COLO O O (Ocow00 O O 0.90 0.94 (0 ,- ,- M M NN ., 0.83 0.83 0.97 0.94 0.94 0.90 r CO CO CO CJ C7 0) 0) CO CO CJ C7 0.14 0.14 T- N. CJ C7 0.18 0.18 0.18 0.14 0.14 0.14 T- r .\-0 6 C7 T- V T -T- 6 C7 T- r T- 0.,-1 6 C7 T- T- CJ C7 T- r T- 0 CJ C7 T- n T-0 CJ C7 Effective Rain in/hr (0 O O CO 0) O O O O N CO O O O O 0.04 0.04 0.04 0.04 0.05 0.05 CO CO O O O O 0.04 0.04 0.04 0.04 CO CO 0 0 0 0 CO CO., 0 0 0 0 -O 0 0 0 0 0.00 0.00 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Loss Rate in/hr Max I Low 0.150 0.142 0.142 0.127 0.135 0.187 0.195 0.210 0.217 0.255 0.255 0.172 0.172 0.202 0.195 W CO 0 0 W h- 0 0 0.142 0.142 0.030 0.030 0.022 0.022 0.037 0.037 M M 0 0 O O 0.030 0.030 0.022 0.015 0.022 0.030 0.022 0.015 0.022 0.022 0.022 0.015 0.022 0.015 0.409 I 0.403 0.397 0.391 0.385 0.379 0.373 0.368 0.362 0.357 0.351 0.346 0.341 0.336 0.331 0.325 0.320 0.316 0.311 0.306 0.301 0.297 0.292 0.288 0.283 0.279 0.275 0.271 0.267 0.263 0.259 0.255 0.252 0.248 0.245 0.241 0.238 (O N CO CO N N O O 0.229 0.226 ,- N N N N O O Storm Rain in/hr 0.178 0) Cr) CD (O O 0 0.152 0.161 0.223 0.232 0.250 0.259 0.303 0.303 0.205 0.205 N CO N N 0 0 NM CO N N N 0 0 vu) T- O N N 0 0 0O) (O (O T- T- 0 0 (0(0 M M O O 0 0 0.027 0.027 0.045 0.045 0.045 0.036 0.036 0.036 h- CO N T- O O O O 0.027 0.036 h- CO N y- O O O O 0.027 0.027 n CO N T- O O 0 0 n c0 N T- O O 0 O RCFC & WCD FAzamaL DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 437% TOTAL ADJUSTED STORM RAIN (in) 2.23 Pattern Percent (Plate E-5.9) 000 N r r C co. r r up 0 N N 2.8 2.9 V V M M MM N N C.0 N N 2.6 2.5 V 00 N N CTO) T- N- 0.4 0.4 MM O O 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 MN O O 0.3 0.3 0.3 0.2 0.2 O O O u) O N (O 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 u) O N u) T- N 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.50 Time Minutes O CO CO 675 690 705 720 735 750 765 780 795 810 825 840 855 870 885 900 (O 0 CO O O) 945 960 (O O 0 0)) O) O) 1005 1020 1035 1050 LO O 0 CO O O 1095 1110 1125 1140 1155 1170 1185 1200 1215 1230 1245 1260 MiEaM 1290 Unit Time Period a a u)(0 7 V 47 48 49 50 51 52 M V up LO 55 56 h co u)u)u)(D(0(D 0)O N 63 64 (OCD (0(O(0(O(0N- V- CO 0)O N n 0- 73 74 75 76 (- CO 1-h CAO CO N 00 CO 83 84 85 86 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm yOOcCi m O a 468.63 468.62 468.60 468.58 468.56 468.55 468.53 468.51 468.50 Total In Basin cu -ft ac -ft (NOm 0.19 0.18 0.18 0.17 NN.- O O O �m(m O O O 7 8,699 _ 8,489 8,248 8,010 7,774 7,540 O) O M 7 O O W 0 M O W M (O Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft NO MIEM 308 305 303 W 00) Q7N ) Q) M M N N N N N 310 308 305 303 301 299 (O 7 N M O) 0) 0) N N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.20 C 0.00378 Low Loss Rate (percent) 83.93% Percolation Area sf W 0 14,870 14,773 14,661 14,551 M 7 M 0 m 4- N O C 7 M 4'4'4'4'4' N 0 C C D O 00) 8,554 8,313 8,075 7,839 On7 ca > j N O T... - OO M ,- CO Z m; U O O) 0 r r r Volume In cu -ft 0) 00) 65 65 65 65 (0(0(0 Flood Hydrograph Flow cfs 0.07 0.11 0 0 0 0 0 0 0 0 6666606 Effective Rain in/hr 0.00 0 O 0.00 0.00 0.00 0.00 O O O 66 666 Loss Rate in/hr Max I Low r 0.022 0.015 0.022 0.015 0.015 0.015 0.015 0 O 0 000 666 0.219 0.216 0.214 0.212 0.210 0.209 0.207 co O O O N N N O O O Storm Rain in/hr 0.027 O N W 0.018 0.018 0.018 0.018 �� O O O O O 0 0 0 0 0 RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z DRAINAGE AREA -ACRES 24.97 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.43 UNIT TIME -PERCENT OF LAG 437% TOTAL ADJUSTED STORM RAIN (in) 2.23 Pattern Percent (Plate E-5.9) M N CO N N N N N N N 0 0 0 0 0 0 0 0 0 0 21.75 22.00 22.25 22.50 22.75 23.00 23.25 us r- o O 2 (h 7 N 0) N N Time Minutes 1305 1320 1335 1350 1365 O 0 O 0 O (0 0) M () N 7 77 7 Unit Time Period 87 88 89 0 N M 7 (C) (0 0)0)0)0)0)0)0) EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY == (0 ( C C 0 0 C 0 0 0 0 N U 0 M,r 3 0(O m0 M70M 1- 0 N M O r M 0 O) 0 (O n 7 M0 N U N O O O O N 6 7'- u M N N BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: 10 YEAR BASIN BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 468 0 0 10,730 0 0 0.00 469 1 1 6,330 17,060 13,773 13,773 0.32 470 1 2 6,965 24,025 20,443 34,217 0.79 WHERE: V= l(El—E2)(At+A2 +.lAiA2) 3 Basin Volume Worksheet Page 13 of 13 0.031 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 WAVE LAGOON DA -A 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 11 D 12 B 2 B 3 B 1 B 6 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT EXISTING BARREN 35.652 X 93 0.09 0.05 EXISTING OPEN BRUSH - POOR 35.233 X 76 0.29 0.05 PAVING/HARDSCAPE 2.082 D 56 0.51 1.00 WATER FEATURE 18.699 D 56 0.51 1.00 COMMERCIAL 5.752 D 56 0.51 0.90 SF - HIGH DENSITY 8.141 D 56 0.51 0.50 LANDSCAPING 57.186 D 56 0.51 0.10 LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION 1,180ft 590 ft 960.0 ft 456.0 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AREA 451.0 ft 707,505 sf 455.0 ft 810,350 sf 0.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD HU(]QCDLCD@V AMAG19Gt1uaL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 1,264,241 464,495 WAVE LAGOON [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -A [3] AREA - ACRES 1.34 162.745 [4] L -FEET 693,659 15.92 1180 [5] L -MILES 803,730 18.45 0.223 [6] La -FEET 799,746 18.36 3.79 590.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.112 [8] ELEVATION OF HEADWATER n/a 960 [9] ELEVATION OF CONCENTRATION POINT 60.87 456 [10] H -FEET 452.05 1.05 504 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 2255.2 [12] SA0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 47.49 [13] L*LCA/SA0.5 0.001 L4] AVERAGE MANNINGS'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.03 [15] LAG TIME -HOURS 0.04 [16] LAG TIME -MINUTES 2.5 [17] 100% OF LAG -MINUTES 2.5 [18] 200% OF LAG -MINUTES 4.9 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR ' 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 850,704 157,045 1,264,241 464,495 1,630,516 840,545 2,605,281 1,801,551 EFFECTIVE RAIN (in) 1.17 1.35 1.34 1.36 FLOOD VOLUME (cu -ft) (acre -ft) 693,659 15.92 799,746 18.36 789,971 18.14 803,730 18.45 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 693,659 15.92 4.37 799,746 18.36 3.79 789,971 18.14 3.84 803,730 18.45 3.77 STORAGE PROVIDED (cu -ft) (acre -ft) 3,033,385 69.64 PEAK FLOW (cfs) n/a 301.94 260.74 60.87 MAXIMUM WSEL (ft) DEPTH (ft) 451.91 0.91 452.05 1.05 452.04 1.04 452.06 1.06 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) _ LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.1972 0.1948 0.0013 0.0115 0.0064 0.0250 0.2881 0.7243 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00246 (24-(T/60))^1.55 + 0.13 in/hr Undeveloped Condition: Low Loss = 90% II L H N o 0 J o 3 O J JII o C H m o3ym U 'O ''' y+N C 0U)OZ N C ON > W -c G m LL O LOW LOSS RATE PER RCFC/2322 0.9000 0.9000 0.1000 0.1000 0.1800 0.5000 0.8200 LOW LOSS CONDITION UNDEVELOPED UNDEVELOPED DEVELOPED DEVELOPED DEVELOPED DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0188 0.0600 0.0007 0.0059 0.0034 0.0140 O N O AREA WEIGHTED AVERAGE 0.219 0.216 N OO 0.035 0.050 N O co W CC Q CO Nco CO (.Nj DI 0 C • N 5.752 8.141 57.186 Lo CVx- .- SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0.09 0.28 0.05 0.05 0 CO x- N O O 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 5% 5% 0 O O O O 0 0 O OO O) 0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] O N 0 0 (n N 0 0 N N 0 0 N 0 RI NUMBER [Plate E-6.1] CO (O Q) I,- 56 56 CO CO (17 ((7 56 LAND USE EXISTING BARREN EXISTING OPEN BRUSH - POOR PAVING/HARDSCAPE WATER FEATURE COMMERCIAL SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] 0(0(0(0(0(0(0 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W m 451.02 451.05 451.09 451.12 451.16 451.20 451.26 451.33 451.46 451.83 451.89 451.91 5 m C Ti 0.40 0.92 1.48 2.08 2.76 3.55 4.50 5.78 8.04 14.47 15.48 15.92 F m 00 U 0 0 7 MN 0 I,- O •,— V 64,525 90,570 120,018 154,571 195,929 251,748 350,104 630,509 674,420 693,659 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 O 00000000000 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 708,100 708,867 709,693 710,576 711,574 712,746 714,148 716,040 719,375 728,882 730,371 731,023 Basin Volume cu -ft 17,538 40,181 64,525 90,570 0 o n O (0 O N 0 195,929 251,748 350,104 630,509 674,420 693,659 _ N E 5 z 0 O U 17,538 22,643 24,344 26,045 29,448 34,552 41,358 55,820 98,355 280,406 43,910 19,240 Flood Hydrograph Flow cfs 58.46 75.48 N W �_ (O co 0 W 0 a, 137.86 186.07 CO n O M 0) co M CO 0 V ••1- 0 U) C U ')p -_-= 2� W 0.36 0.46 0.49 0.53 0 0 o--- OOO-N6 7 0) 0.— 0 0 O I-- 0.89 0.39 Loss Rate in/hr Max 1 Low 0.53 0.62 0 0 0 0 0— 1.92 5.07 O O 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 Storm Rain in/hr 0.62 0.73 r W O O 0))� O O'—'— a0N 00) N 0'— ua 700 O RCFC & WCD FIVDG011 Ctrl UAILIAML DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 204.0 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.27 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) CO N M 4 4.4 4.6 O 0 N 0 6.4 8.1 13.1 34.5 I,- CO 0 0 Time Minutes Hours 0.08 0.17 N co N 0 0 0 0.42 0.50 co I's LO 0, 0 0 NMN CO 0 0 0 0) O 0 N 0 O 0 N N 0 35 40 45 50 55 60 Unit Time Period 1— N C) V 4) (O I- W Q) o`- N U O U } 0 0 0 0 0 0 0 U O 7N N N 0• O U • I. O 0 O a 0 O 0 4) 0) 0) T O O r O (O to W J 0 O r 0 0 O ce O J 0 LL W W W Z 0 0 W 0 Z W W g � Q 1- 0 0 Qct LL V) Luw E ZW U Lu K Q O->�O>KK W 03 O<00 LL F Z J W O OCf 0 Ya Q K w 00 a 0w�_I WL,WW OQ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J y W 10 CO 451.00 451.01 0 O V 7 co O V 7 451.05 451.06 451.07 451.08 451.09 451.10 N V V 7 451.16 451.18 N CO 7 7 N CO 7 7 CO CV M 7 7 451.38 451.42 451.45 U 0 C t0 y 0.08 0.15 0.17 0.31 0.44 0.66 0.80 1.02 N co 1.54 1.76 2.10 2.44 2.78 3.06 3.51 4.00 4.39 4.87 co N- 6.67 7.24 7.84 Om N U A8NMN M (O I, c6 OM) oi N 34,815 44,484 10OC` 8 V (^0 91,566 106,292 121,018 133,216 152,999 174,047 191,302 212,349 240,982 267,086 290,662 315,502 341,607 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 707,619 707,732 707,760 707,959 708,158 708,486 708,685 709,013 709,341 709,540 709,782 710,110 710,609 711,109 CO N O N CO O N r r 712,692 713,406 713,991 714,705 715,675 716,560 717,360 718,202 719,087 N y E 210 J [D; U � M co Mf0 N NO (U M h� 0) CO (7M N 0) N 34,815 44,484 M 0 0 CO O �f00 67,171 76,840 91,566 106,292 CO CO ON .-.- 152,999 174,047 N 0) M0 M CO 240,982 267,086 290,662 315,502 341,607 O) C 3 U 1010 �7 CO CO MM 820 5,877 h O) Ih(OIh(O1010 CO CO NO) h O) CO CO NO) O 1.--(0 CO 10 O)cn �10 CO hO) 14,726 14,726 14,726 12,198 19,783 21,047 17,255 21,047 co 7 MO CO NN 23,576 24,840 26,104 Flood Hydrograph Flow cfs 11.16 11.16 2.73 19.59 19.59 32.23 19.59 32.23 32.23 19.59 OM CO N V/ N N CO 49.09 49.09 49.09 40.66 7(O O N- (O O (O h- 57.52 70.16 95.44 87.01 78.59 82.80 87.01 Effective Rain in/hr t... O O O 0.02 0.12 CV N- O O N O O 0.20 0.12 T N O O 0.30 0.30 0.30 0.25 0.40 0.43 M CO O O 0.58 0.53 0.48 0.50 0.53 Loss Rate in/hr Max 1 Low co co (‚(('01(0 O O 7M O O 0.33 0.39 0.33 0.39 0.39 0.33 0)0) MM O O CO CO 7 V O O 0.48 0.44 N- 0) 0)10(0.00(0(0(0 0 0 ('10)0410(00) 0 0 0 0 OD 0 0 0 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 Storm Rain in/hr co CO O O 0.28 0.39 0.39 0.46 0.39 0.46 CO M O O 0.41 0.46 0.56 0.56 0.56 0.51 CO 10 O O CON(O O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 204.0 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.27 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) M co. I. T- 7 (n I- T- 1.5 1.8 1.5 _ 1.8 1.8 1.5 c0 CO. I- T- 2.2 2.2 2.2 2.0 CO C` N NNNM V C` CO a - cM 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 N CO O O 0.42 0.50 0.58 0.67 0.75 0.83 ON) O O N- CO 7 N- N CO N- 1.42 1.50 1.58 1.67 r CO -- 1.92 2.00 2.08 5 10 15 20 N M 35 40 45 50 55 60 CONOn 75 80 W m O 0 CD _ 105 110 _ 115 120 125 Unit Time Period N 01 mr (n 10 x 10 O) O N 7 15 16 T- CO 19 20 21 22 CO N 0 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm �\ ° 451.50 451.57 (\(\ 452.01 452.03 452.04 452.05 452.05 7175 . 15 2 381,618 431,743 462,904 535,785 614,988 705,569 767,072 779,270 788,939 798,608 799,746 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft CD CD CD CD CD CD CD CD CD CD CD SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 720,444 _ 722,143 723,199 _ 725,670 728,356 _ 731,427 733,512 _ 733,926 734,253 _ 734,581 734,620 «§ + 2! : 381,618 431,743 462,904 535,785 614,988 705,569 767,072 779,270 788,939 798,608 799,746 )_ \\\ « °as 31,161 72,881 79,203 90,581 61,503 12,198 §§§ aa%— Flood Hydrograph Flow cfs Coto 103.87 _ 242.94 264.01 _ 301.94 205.01 40.66 32.23 32.23 3.79 Effective Rain in/hr 0.63 1.48 1.25 0.25 Loss Rate in/hr Max 1 Low 1.29 0.44 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 0.27 Storm Rain in/hr 0.90 1.75 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 204.0 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.27 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 CO CV 5.9 2.0 cq cq co Time Minutes Hours 2.50 2.58 2.67 2.75 6 in co co 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 CV CO co co 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY ('1 mr Lo C• 0 c 0 O. PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm CJ .y UJ CO CO CO> 451.00 451.00 0 0 7 17 7 7 0 0 7 17 7 7 N 0 0 7 17 7 7 N N 0 0 N) 7 7 N C) 0 0 N) 7 7 d) c0 0 0 N) 7 7 CO V 0 0 N) 7 7 V 7 0 0 N 7 7 7 451.04 451.05 451.05 451.05 451.05 I 451.06 Total In Basin cu -ft ac -ft CO (0 0 0 0 0 O CO 0 0 (OO c- N 0 0 a CO N N 0 0 N UD M M 0 0 C3 ,t 7 7 0 0 0, CO 7 (O 0 0 ON (O CO 0 0 1.....T- CO I, 0 0 CO 1` W 0 0 N0) a0 W 0 0 71- 0) 0) 0 0 (h O N 0) Nf0 N W Lo (n N �fOO 7 (n M Lo 0) ON W h W 1'- W NN O N I. (0 7 6 0) (0 m (n (O N 6 N (0 (0 h 0) CO U) h CO NN n N N CO 0) ,t (n n N N to O O ,000) O) N (0 CO O r (h 7 (0 (0 CO COO 0) W (O W (0 (0 I. N CO GD7 O N 7 7 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 707,546 707,596 707,646 707,696 707,745 707,804 707,862 707,920 707,978 708,036 708,094 708,160 708,226 708,293 708,359 708,425 708,492 _ 708,558 708,624 _ 708,691 708,757 _ 708,823 708,890 f 708,944 Basin Volume cu -ft 1,223 2,690 4,158 5,625 7,093 8,805 10,517 12,229 76 0) 0 (h(n 17,365 19,322 �m N N .- (h N N 25,191 27,148 29,105 31,061 33,018 34,975 36,931 38,888 4((0 00 7 O N 7 7 C 3 M r- N CO N77771 1` r- CO CO 1` N CO -1-r . N N .. . N N 1-r .. . N r- (O 1.0) .. . r- r- (O (O W 0) .. . r- r- (O (O W 0) .. . N. r- N (0 0)00)0) .. .. N. r- N 1)) .. .. N. r- N 1)) 0)O) .. .. N. CO N cO 0) (0 Flood Hydrograph Flow cfs 4.08 4.89 4.89 4.89 4.89 5.71 n r vi 11 r r vi 6 5.71 6.52 N N (O 10 (O (O N N (O 10 (O (O 6.52 6.52 6.52 6.52 6.52 6.52 6.52 5.29 d 0 .C.,'," .0OOOOOOOOOOOOOOOOOOOOOOOO 4.W C[ C N CO Ci O CO CO Ci O CO CO Ci O CO CO Ci O CO CO Ci O CO 7 Ci O 7 7 Ci O 7 7 Ci O 7 7 Ci O 7 7 Ci O 7 7 Ci O 7 CO Ci 0 Loss Rate in/hr Max 1 Low N- O O r 0- O O r O N O O O O N N O O O O N N O O O CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO (0 N N O O N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 Storm Rain in/hr N O O 0.20 0.20 0.20 0.23 CO CO O O CO CO O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 204.0 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.27 LOW LOSS RATE - PERCENT 85.00% Q1 C C (n d U W 0) a a m a NOOO CIO CIO OI` CIO 11` CIO 11,, CIO 1 W Ci O c0(0 C1 0 c0 (0 C1 0 GO cO Ci CD GO cO Ci CD GO cO Ci CD a00) Ci Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 (NI O 0) O O .— 1.08 1.17 10 CO N co. — c - 1.42 1.50 1.58 1.67 1.75 1.83 2.00 CD (O O N (O O NM (O O M77(0 (O O (O O (O (O (O O CO 1—rO (O O (O O W 0) (O N 0)CD 0 0 CDc— CM 0 Unit Time Period T- N (0710(00- CO 0)O_,_ N 13 14 15 16 17 18 0)N I. NN NN PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J y W x 03 CO CO 451.06 451.06 451.06 451.06 451.07 451.07 451.07 451.07 451.08 451.08 451.09 451.09 451.09 451.10 c- Ti; 7) 7 7 N M N 77) Cr 7 451.15 451.16 451.17 451.19 451.21 451.22 _ 451.24 I 451.26 Total In Basin cu -ft ac -ft N (00 OOO77N ,- T- CO T- T- (D O T- T- 7I- NN T- T- O N M70OOn T- T- O I-7 T- T- (0 T- T- N CO co 0m- T- T- M7(0 M N N 0I�ON . N N N CO M M 0 CO ON M M 0 N O . 7 7 0 0 OD 1 -(OO M 0 7 0I, 777700000(0 7 0— Cr; 0 1- MN h co O N 7 N O O O M O 0 CO NM h 0 W CO 7 Ul 1-0� M 0 0 0 CO(O N O (O rl` O N ODM N c- (0 co W I� r N O N O 0.) CD N- N- OO 0 N O O TCq CO 0 X700 0 0 N opmr 0 0 0 O .5 U3 CO CO O as O M 0 co a, Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 0 00700(— . 1 N0 OQ y U 0) 0 0 - 000)0) 0000000000000 h I'- x - r 1` I'- 00 NIS NN 1` I'- CO 1--- M CO CO_M 1` I'- CO O7 O O Cr_ (00) 1` I'- CO N C000 1` I'- NI) M 0 1` r (0 0000(0 (O N N7 O CJ 1'- r 7 N (00 00 n r 0 Co N n r (ON O O W CO ,Fr n r NM CDCO N. rM n r 0(0 N CO ISN M n e- Basin Volume cu -ft 44,389 45,976 47,564 49,151 50,739 52,327 Cf 7N 00 M O O O 000 r OM) OD 0 O 0 65,156 68,374 71,592 76,441 81,289 86,138 92,617 100,727 110,467 120,207 131,578 142,949 155,950 168,951 co O CO 0 C 3 o V 1'-O O CO1CO1CO1C0 00000000 .—.—.—.—.— co co co co co co .— co co NN MM co 00000) NN MM 7771.E N CO M7 000000NN CO CO mi, 7 me- x- (O co' 77 1. r O)Oi ' MM `—`— 00 00 vi M(p (ON Flood Hydrograph Flow cfs NN YD I!". 5.29 5.29 5.29 5.29 5.29 5.29 (00-0-0-0-0)00 0 0 0 0 O (O (O (O 21.60 27.03 32.47 32.47 CD CO CO CO CO 7M M (0 7 7 48.77 54.21 am i C U'(p L g cc .2 W 7M 0000000000000 0 0 MM 0 0 MM 0 0 MM 0 0 13r 0 0 1`r 0 0 1`000 0 0 0 0 (0 000 0 0 NN 0 0 MM NN O 0 000M NN O O MM O O Loss Rate in/hr Max 1 Low CO O NN . O O O O N N O O O O N N O O O O N N O O O0 c0 N N O O O0 c0 N N O O W N M O O COCOCOCOCr7 O O 0.34 _ 0.37 0 0 O O N N O O 0.45 _ 0.45 OD 7 O . O O N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N 0 0 Storm Rain in/hr 0.26 0.30 0 0 M M 0000000000 0 0 M M 0 0 M M (0 co M M (0 co M M 0.33 0.36 CO (0 CO CO O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 204.0 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.27 LOW LOSS RATE - PERCENT 85.00% 0 C C (n d U W 752 CL a a m F_ W 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O O T- T- O O T- T- O 7 T- T- 7 7 T- T- N M T- T- 7 7 T- T- O O T- T- (0 (O T- T- 1* T- Time Minutes Hours 2.08 2.17 N co N Ni 2.42 2.50 2.58 2.67 r 0 N N 2.92 3.00 3.08 3.17 N co M M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 O O N M LO O M cr C. LO O 0 LO O O 0 LO O O r LO O r CO LO O CO 0 LO O 0 0 N LO O 0 N N LO O N N N LO O N M N N LO O M 7 N N LO O 7 0 N N Unit Time Period N N N N 29 30 31 32 M M 35 36 M CO 39 40 41 42 V V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm y W N ((1) CO 451.29 451.31 451.34 451.37 451.40 451.43 7 N 7 7 N 7 7 451.62 451.68 0 0 7 7 0 0 N 7 7 0 0 NN V 7 Cr 0 NN V 7 452.04 452.04 Total In Basin cu -ft ac -ft O N 0 7 N N MN 0 7 N (O 7000M00000M 0 0 (D r n OD 6 M 0 0 0T- M Ni W (00000m- Nh.: OD N OD N 0 OD 141 00 .- M(0 N- N r f: CO N N 258,415 279,568 302,353 326,767 co 07 ,-N CO CO 0 05 0 N. CO CO 406,534 435,840 473,299 518,911 569,414 624,808 688,356 766,577 784,470 786,058 787,525 788,748 789,482 789,971 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O 0 0 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 714,887 715,549 716,266 716,984 717,756 718,584 719,467 720,350 721,288 722,282 723,552 725,098 726,811 728,689 CO N Cr 0 CO 7 O M CO CO N. 734,102 _ 734,156 734,206 _ 734,247 734,272 _ 734,288 Basin Volume cu -ft CO ,- M(0 N- N r f: co N N 258,415 279,568 302,353 326,767 CO CO ,-N CO CO 0 05 N 1 - M co 406,534 435,840 473,299 518,911 569,414 624,808 688,356 766,577 784,470 786,058 787,525 788,748 789,482 789,971 (1 E 5 C 3 Z. 0 MM ON co Nf� N.:0 777 NN N N N CO 7 N 7 N N NN 77 0 0 (O (O N N CO O0N f�O (O M N.:Oi N N N 7 (O N.: 10 M 7 M N 0070 N M 0 0 N N r...- 01 N N M a0 O n co 00 00 ,, (- X. ,,,N- NC') 7 N 70 0 N r 7 Flood Hydrograph Flow cfs 59.64 65.08 70.51 70.51 N OO 0)0 CO. NN nmm N N CO CO 0 N 0 N 0 N 124.86 152.04 M O oo00 cd,i 211.82 260.74 59.64 5.29 4.89 4.08 2.45 1.63 d C .C5'5 L W iZ' C W (00 Ma 0 0 MM 7770 0 0 CO 0 0 MM NN 0 0 CO N(O 0 0 (OM f-00.%. 0 0 MM 00 CV .-- CO (0 M00000 0 0 M0 0 0 ..- 0 0 Loss Rate in/hr Max 1 Low 00 0 0 (0 O O 0.59 0.59 (NN O (0 0 0 (00 (00 0 0 F F 0 0.- 0.87 1.01 O— CO 1.32 1.58 O N O O 0.17 _ 0.14 0.08 0.06 (- r- N N 0 0 f- r- N N 0 0 f- r- N N 0 0 f- r- N N 0 0 f- r- N N 0 0 f- r- N N 0 0 f- r- N N 0 0 f- r- N N 0 0 f- r N N 0 0 1- r N N 0 0 f- r N N 0 0 Storm Rain in/hr co 0 O O 0 0 O O 0.73 0.76 0.79 0.79 0.83 0.86 CO m- ..-.- N M 1.56 1.85 COMM O O 0.20 0.17 N- 0 O O RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 204.0 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.27 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 0 O' N N N 2.2 2.3 7 7 N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 a 0 ,- O 0.6 0.5 M N O O Time Minutes Hours N co N CO 7 V N 0 7 N 7 V CO r N 0 7 V N CO 1` 00 7 V N 0 0 0 7 0) CO r 0N- 0) (f) N CO N CO 0) (f) N 0 7 N 0) (f) CO r N 0 0) 0) N CO r CO 0) 0) N O 0 0 0 (O N O 0 0 N N N O 0 1` N N N O 1• CO N N N o CO 0 N N N o 0 0 N CO N O 0 CO CO N O N CO CO N O N O) CO CO N O M 7 CO CO N O 7 N CO CO N 0 N (O CO CO Unit Time Period NN 53 54 55 56 57 58 (0O(0D (O(ND 63 64 (NO(O 67 _ 68 ((00N- nr EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 C 5 = 3 U3 OU U C� U� (O 7O7 J0 0 0 M Cr/N7 • N N UO N OCO O pmr CO 00 cy LUF- CD O W W W H 0 0 wg J 7 Z W w H p 0 2200 W 0 0 ce Z W cL J OO W W 0j W p m a 0 I- c N WU J ZJ w00=¢Q44 -- wwU' O 00 e <MUJU-u_cl20 E- PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C w J N $ 00 451.00 451.00 451.00 451.01 451.01 451.01 451.01 451.01 451.01 451.02 451.02 451.02 451.02 451.03 451.03 451.03 451.04 451.04 451.04 451.05 451.05 451.05 451.06 451.06 451.07 451.07 451.08 451.08 451.09 451.09 451.10 451.11 ,_ N V V 451.13 451.13 7 D) T- up up V 7 451.17 451.19 451.19 I 451.20 451.22 Total In Basin cu -ft ac -ft 0.02 0.04 I. I:0 L0.0 M CO O O 0.19 0.22 CO O N CO O O 0.34 0.39 M 0 7 V O O 0.52 0.57 M 0) CO CO O O 10 CO I� CO O Op- 0.88 0.94 0) O O 1.17 1.25 1.34 1.43 N CnCO 1.72 1.84 r r- 0) ,- N 2.25 2.26 2.39 2.61 2.89 3.25 CO N O CO CO CO M M M V N C0 00 CT CO 0 N 0) CO M V N V CO M 00 0 Cn rN 8,207 9,770 M CO CO O) CO CO O V Cn O 00 CO 7 CD M N 10 I� r W O N CO CO CO O N C0 N N 10 Cn 0) M O IS O N M r CO N N CO O) N CD M M 38,298 41,033 44,160 47,286 CO O O N CO CO O V up N CO CO N CO N 00 N U7 CO 7 CO 7 7 O CO O O CO I- 75,032 80,112 85,974 91,836 98,089 98,254 104,254 113,478 125,920 141,576 147,438 153,299 165,530 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00246 Low Loss Rate (percent) 85.00% 707,531 707,571 707,611 707,664 707,704 707,743 707,783 707,836 707,889 707,942 708,008 708,075 708,141 708,207 708,273 708,353 708,432 708,525 708,618 708,724 708,803 708,896 709,002 709,108 709,227 709,347 709,479 709,612 709,744 709,890 710,049 710,221 710,420 710,619 710,831 710,836 711,040 711,352 711,774 712,305 712,504 712,703 713,117 Basin Volume cu -ft 782 1,954 Cfl O N Cr, = = CD 05 C0 N V CO O uj n I� O 0 C` N I-- D7 O. M CO M O) M CO = ci 14,850 16,804 18,758 20,712 CO T— CO CO O N N N N Ln l0 O) M O r O N M Is.— CO N N CO 0) N u7 COM M CO CO O CO N O 00 COM V 44,160 47,286 CO 0 O N CO CO O V C0 u7 CO CO N N T- o0 N C0 O 66,044 70,343 75,032 80,112 85,974 91,836 98,089 98,254 coM ,r N ,I- CD T— 125,920 141,576 147,438 153,299 11 165,530 Volume In cu -ft N NC, r T- 1,172 1,563 1,172 1,172 1,172 1,563 0107,f CD CD C0 N V C0 N 0) 0). V V C0 N 0) 0) 1,954 2,345 C0 CD V M CO r N N 2,736 3,126 2,345 2,736 CD CD N N =.- M M r C` C0 LO M M 3,908 3,908 3,908 4,299 4,690 5,080 5,862 5,862 6,253 165 O V O N'' 0 N CD CT M U" U) O _..(° N N CD CD M CO CO N vi Cn Flood Hydrograph Flow cfs I- O W CO O � 1.30 1.74 1.30 1.30 1.30 1.74 1.74 1.74 2.17 2.17 2.17 2.17 2.17 2.61 2.61 3.04 3.04 3.47 2.61 3.04 3.47 3.47 CO CO M M V 7 CO CO V V V CO CO h V V 7 N CO C0 ui LO l0 CD CD LO CO CO CD O CD N CD ci 13.83 17.39 LO Ln O CD O CD C U Cp 1 K .0 W 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 CO CO 0 0 0 0 CO CO 0 0 0 0 CO CO 0 0 0 0 0.04 0.04 0.04 0.00 0.04 0.06 CO 0' O O 7 7 co 0 0 0 O O O Loss Rate in/hr Max I Low O N O O 00 O 0.045 0.060 0.045 0.045 0.045 0.060 O O O O O O 0.075 0.075 0.075 0.075 C0 O O 0) 0 0 O u7 0) O 0 0 C0 O O N 0 0 0.090 0.105 O O N N O O 0.135 0.135 O O C0 u0 0 0 O u7 C0 CD 0 0 O u7 a0 co 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 C0 u7 O N N O CO O O O 0.469 0.464 0.459 0.453 0.448 0.443 0.437 0.432 0.427 0.422 CD ,— O O 0.406 0.401 O O CO CO O O 0.386 0.381 0.376 0.372 0.367 0.362 0.357 0.352 00 CO V 0) CO CO O O 0.339 0.334 0.329 0.325 O CD M CO O O 0.312 0.307 0.303 0.299 0.295 0.290 0.286 0.282 (0(0 O V V N N N O O O Storm Rain in/hr C0 CO CO N O O O O 0.053 0.071 CO CO C0 N O O O O 0.053 0.071 I` C` O O O O 0.088 0.088 0.088 0.088 CO C0 CO O O O O 0.106 0.123 M N VV O O 0.106 0.123 V O O CP O) C0 N O O CD CD r n O O CD V r O) T- O O N O) = N N N O O C0 Cn CD CD N N O O 0.282 0.300 0.335 0.353 0.370 0.388 C0 Cn CO CD CO C0 N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 612% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 C0 CO O O CO C` O O 0.7 0.8 CD C` O O 0.8 0.8 A O 0 0 O O T— T— O 7 T— T— 1.2 1.3 C0 N T— T— CO r T— T— O) O T— N v- N N N Ln Cn T— T— N N OO 2 0.25 0.50 C0 O I"... O T— 1.25 1.50 1.75 2.00 2.25 2.50 C0 O r O N M 3.25 3.50 C0 O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 C0 O r O CO I— 7.25 7.50 C0 O r O r W C0 O N C0 o0 Cb 8.75 9.00 9.25 9.50 I� O 6 0 N CD Cr 0 0 Time Minutes 15 30 45 60 O O O 135 150 165 180 0) O N 225 240 255 270 285 300 l0 O CO M 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 l0 OUl CD CMO CO Unit Time Period T- N M V C0 CO r CO 0) C"- c- N c- M V c- 15 16 r- W ,- c- 19 20 N N N CO V N N 25 26 27 28 29 30 N CO CO CO 7 CO M 35 36 0- o0 CO CO 39 40 N CO 4 4 4 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm S Iii N 0) CO> X 451.24 451.25 _ 451.26 451.27 451.29 451.32 m vv V V LO. V V 451.61 451.65 451.68 451.73 451.78 451.83 451.87 451.92 451.96 451.98 00 N N V V 452.01 452.02 452.02 452.02 452.02 452.03 452.03 452.03 452.03 452.03 452.03 _ 452.04 452.04 452.04 452.04 452.04 452.04 452.04 452.05 452.05 452.05 Total In Basin cu -ft 1 ac -ft 4.09 4.34 4.60 4.76 4.98 5.64 6.37 7.23 8.17 9.41 10.67 11.28 O 0) N. NM V (O V V 15.23 15.97 CO N (O O h 17.59 17.63 (O0) CO (O I.- h 17.72 17.76 (0 CO CO 1` 17.89 17.92 17.96 17.98 18.00 18.03 I� cr) 0 0 O O 1. cl. O O (O0) O O V (O N N N O O O T- 178,345 189,132 200,490 207,202 217,079 245,745 277,562 315,130 N- CO CO 0) CO 0 0) O 0 M V 464,876 491,511 518,652 556,715 592,665 629,101 663,411 695,587 725,622 745,693 766,214 767,777 769,340 770,512 771,685 773,639 775,593 777,547 779,110 780,673 782,236 783,409 784,190 785,363 786,926 788,098 788,880 790,052 791,224 792,397 793,178 794,351 795,132 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00246 Low Loss Rate (percent) 85.00% Percolation Area sf 713,552 713,917 N O O CO CO (0 7 1` r 714,865 715,837 716,916 718,189 719,569 721,409 723,266 724,169 725,090 726,380 727,599 728,834 729,998 731,088 732,107 732,787 733,483 733,536 733,589 733,629 733,668 733,735 733,801 733,867 733,920 733,973 734,026 734,066 734,092 734,132 734,185 734,225 734,251 734,291 734,331 734,371 734,397 734,437 734,463 C y m 2 O m U 178,345 189,132 200,490 207,202 217,079 245,745 277,562 315,130 M 00) CO O 0 0 M V 464,876 491,511 518,652 I 556,715 592,665 629,101 663,411 695,587 725,622 745,693 766,214 767,777 769,340 770,512 771,685 773,639 775,593 777,547 779,110 780,673 782,236 783,409 784,190 785,363 786,926 788,098 788,880 790,052 N 00)) N CO N r 793,178 794,351 795,132 Volume In cu -ft 12,815 10,787 CO N 9,877 28,666 31,818 37,568 40,706 54,260 54,780 26,635 27,142 38,063 35,950 36,436 O CO M M M M 30,035 20,071 20,521 1,563 1,563 1,172 1,172 1,954 1,954 1,954 1,563 1,563 1,563 1,172 782 1,172 1,563 1,172 782 1,172 1,172 1,172 N N n N co CO N.- c r Flood Hydrograph Flow cfs 14.24 11.99 CD cy 7 CV I� 10.97 31.85 35.35 41.74 45.23 60.29 co 0 N 30.16 42.29 39.94 40.48 38.12 35.75 33.37 22.30 22.80 1.74 1.74 1.30 M , N r N N 1.74 1.74 1.74 1.30 W M O— 1.74 1.30 W M O— 1.30 1.30 W M W O— O Effective Rain in/hr O CD O O O 0.08 0.05 O O O 0.22 0.25 0.28 0.37 0.37 0.18 0.18 0.26 0.24 0.25 0.23 0.22 0.20 0.14 0.14 0.01 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 0.510 0.345 0.345 0.405 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 (OO (00 O O O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 M4M O O O O O O 0.266 0.262 0.258 0.254 0.251 0.247 0.243 0.240 co N co co CV N N O O 0.229 0.225 0.222 0.219 0.215 0.212 (3) O O O N N 0 0 N 0) O 0) N 0 0 (0 CO 0) 0) 0 0 O I- 0) O 0 0 O N 0 O 0 0 0) O I� r 0 0 0.174 0.171 0) O (0 O O O 0.164 0.162 0) n LO 10 O O 0.155 0.153 0.151 0.149 N. O V V ,I- 0 0 0 Storm Rain in/hr 1M M CO CO O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 1f) 10 O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 M N- 03 0 O O N- 11) 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 r- 0) 0 0 O O 0.035 0.053 0.053 0.053 M CO 0) M 0 0 0 O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 612% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 0) (- N. co 10 N N O CO N N 2.9 3.4 V CO M N CO N. N N 2.6 2.6 0,t N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 Cl CO N O O O 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O 1f) O N ci 7 N 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O 1f) O N O O N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O 10 O O N LO N N N Time Minutes COOn CO O 690 705 720 735 750 765 780 795 810 825 840 855 870 885 0 0 0) 0) 930 945 COOn d) d) OO) 0 d) O 1020 1035 1050 1065 0 00) O O 1110 1125 1140 1155 1170 1185 1200 1215 03 7 l CO0n 00) l l Unit Time Period 44 45 46 47 48 49 50 51 N co (O (0 V 1O (O 10 56 57 CO O) (O (O 0 (0 0 N CO 0 0 64 65 CO I� O O CO O) CO O LL OL N M 0- r 74 75 CO NT N. n CO 01 N. N.. 0 CO CO 82 83 V (O O CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W CO 452.05 452.05 452.05 452.05 452.05 452.06 452.06 452.06 452.06 452.06 Total In Basin cu -ft 1 ac -ft MO 18.33 18.34 18.36 18.38 18.40 18.42 18.43 18.45 NM MM 796,305 797,086 798,259 799,040 799,822 800,603 O N- 802,948 803,730 CO W (O CO S N O O W CO Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00246 Low Loss Rate (percent) 85.00% Percolation Area sf 734,503 734,530 734,569 734,596 734,622 734,649 734,675 734,702 734,728 734,755 C N > m ; U 796,305 797,086 798,259 799,040 799,822 800,603 801,385 802,167 802,948 803,730 Volume In cu -ft 1,172 782 1,172 782 782 782 782 782 782 782 Flood Hydrograph Flow cfs 1.30 0.87 O r- M m 0.87 0.87 r n m m 0.87 0.87 0 66 Effective Rain in/hr 00000000 6666666666 Loss Rate in/hr Max 1 Low 0.045 0.030 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.142 0.141 m W M_ M_ n O M_ M_ 0.135 0.134 0.133 0.133 O O O O Storm Rain in/hr mo 0.053 0.035 0.035 0.035 0.035 0.035 mm 0 0 0 Co0 O O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 162.75 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.45 UNIT TIME -PERCENT OF LAG 612% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) co N CO N N N N N N N 0 0 0 0 0 0 0 0 0 0 O 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 2 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 W 00) 0) 0 N> 93 94 006 ) a C U U C l UtU V, E O O 7 N � M 7 M 7 M N co. U U 2 400--06M CO My 000 U) O. W W O O c.f..- 0 0 i W O Q O 0 W W W O Z W 0 0 � NQ JZm WW 1-00 OO QJ 0)K W OW MM(Z Z a �Jy>DDWWwOQw H J i i (n J m (� W J f U O O �j LL J Q LL CC FQZ,l0000 <cOO FW W 1- 2' 0 W LL d O Q BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: WAVE LAGOON BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 451 0 0 707,505 0 0 0.00 455 4 4 102,845 810,350 3,033,385 3,033,385 69.64 WHERE: V= l(E1—E2)(141+A2 +.lAiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 BASIN B DA -B 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 1 B 2 B 3 B 4 B 5 B 6 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT COMMERCIAL 1.483 D 56 0.51 0.90 PAVING/HARDSCAPE 2.574 D 56 0.51 1.00 WATER FEATURE 6.423 D 56 0.51 1.00 SF - LOW DENSITY 20.347 D 56 0.51 0.30 SF - MEDIUM DENSITY 0.000 D 56 0.51 0.40 SF - HIGH DENSITY 0.000 D 56 0.51 0.50 LANDSCAPING 10.759 D 56 0.51 0.10 LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION 2,000 ft 1,000 ft 485.0 ft 460.2 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AREA 458.0 ft 279,800 sf 459.0 ft 304,405 sf 0.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 323,050 140,132 BASIN B [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -B [3] AREA - ACRES 1.20 41.586 [4] L -FEET 169,568 3.89 2000 [5] L -MILES 166,219 3.82 0.379 [6] La -FEET 182,917 4.20 1.60 1000.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.189 [8] ELEVATION OF HEADWATER n/a 485 [9] ELEVATION OF CONCENTRATION POINT 13.72 460.2 [10] H -FEET 458.63 0.63 24.8 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 65.5 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 8.09 [13] L"LCA/S^0.5 0.009 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 0.08 [16] LAG TIME -MINUTES 4.8 [17] 100% OF LAG -MINUTES 4.8 [18] 200% OF LAG -MINUTES 9.6 RAINFALL DATA [1] AMC 11 [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 217,379 47,811 323,050 140,132 416,643 235,776 665,724 499,505 EFFECTIVE RAIN (in) 1.12 1.21 1.20 1.10 FLOOD VOLUME (cu -ft) (acre -ft) 169,568 3.89 182,917 4.20 180,867 4.15 166,219 3.82 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 169,568 3.89 1.72 182,917 4.20 1.60 180,867 4.15 1.61 166,219 3.82 1.76 STORAGE PROVIDED (cu -ft) (acre -ft) 292,016 6.70 PEAK FLOW (cfs) n/a 75.02 64.49 13.72 MAXIMUM WSEL (ft) DEPTH (ft) 458.58 0.58 458.63 0.63 458.62 0.62 458.57 0.57 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0064 0.0062 0.0154 0.3229 o O O 0 0 00 0 0 0.2121 0.5631 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00293 (24-(T/60))^1.55 + 0.16 in/hr Undeveloped Condition: Low Loss = 90% II L H H o 3 O J J II J C H E� m G J y R U 0-U100' C O > (n 0 m LL O LOW LOSS RATE PER RCFC/2322 0 0 0 0 co0oco o o 0 0 0 0 co 0 0 0.5800 0.5000 0.8200 LOW LOSS CONDITION DEVELOPED DEVELOPED 1 DEVELOPED DEVELOPED DEVELOPED DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0035 0.0032 0.0079 0.1822 0.0000 0.0000 0.1201 N- M o 1 AREA WEIGHTED AVERAGE 0.036 0.062 0.154 0.489 0.000 0.000 0.259 (1) ce Q 1.483 2.574 V M O N 0.000 0.000 I ,_ co 7 SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0 .. .,-000101N 0 0 , 0 0 co co 0 0 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] o CD cr,0 0 0 0 0 0 Or O 0 O PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 N N O O N N O O N O RI NUMBER [Plate E-6.1] CO (0 (0 (0 CO CO (0 (0 CO CO (0 (0 CO (0 LAND USE COMMERCIAL PAVING/HARDSCAPE WATER FEATURE SF - LOW DENSITY SF - MEDIUM DENSITY SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] COCOCOCOCOCOCO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W m 458.01 458.03 458.05 458.07 458.09 458.12 458.16 458.20 458.29 458.53 458.57 458.58 5 o m S= 0.09 0.21 0.33 0.47 0.63 0.82 1.05 1.36 N N 0?. .—c6 3.79 3.89 N F 4i B 3,841 8,987 O M O O N N 7 O N 27,467 35,656 45,584 59,208 83,700 154,712 165,292 169,568 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 000000000000 000000000000 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 280,124 280,557 281,027 281,534 282,114 282,804 283,641 284,789 286,853 292,836 293,727 294,088 Basin Volume cu -ft 3,841 8,987 14,568 20,583 27,467 35,656 45,584 59,208 83,700 154,712 165,292 169,568 o E C 0 3,841 5,146 O 0 N O N (O 6,885 8,189 9,928 13,623 24,492 71,012 M O 0's O V Flood Hydrograph Flow cfs 12.80 17.15 18.60 20.05 I() O m M N 14 N N O) O 7 C) o M R 81.64 236.71 35.27 14.25 U) ?= U 'Ip t o g 0 M RN 0 0 0.44 0.48 0.55 0.65 m O -00000) 6,-.-666 O,-.- N 7 6 7 7 0 0 Loss Rate in/hr Max 1 Low 0.53 0.62 00066.- n W mm0rn 1.92 5.07 M O O O 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 Storm Rain in/hr 0.62 0.73 0001-.-00000 N- r 0000.-,16.-0 O m a N m 7 0 RCFC & WCD FIVDG011 Ctrl UAILIAML DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 104.6 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.32 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 0C,/ 064 4.4 4.6 00 N N 6.4 8.1 13.1 34.5 O O M Time Minutes Hours 0.08 0.17 0M NM 06 0.42 0.50 ON -L0000'40 M O 06060 N O m O .)%-x-O N N M 35 40 45 50 55 60 Unit Time Period 1- N C) V 4) 0 I- W m°'— N C 10 10 C 10 10 m 10 1 0l) 10 C 0 U M U V N) U M U (� — U 4) },-CON-,M 0006N-00 M O MT, N a M p E N- N. 04 OI N d • N 7 O 0 to W 7 J 0 O r 0 O O J 0 LL W W W ~ Z C70 W Z W W* Q 1-00 w 10000»hN �Z(L U K Q co>>OwwtW 0<CQQJ 'Jaw J W O O 0 Y.2 w 00 < 00 U- W L, W1 0> PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W m 458.00 458.00 458.00 458.01 458_01 458.02 458_02 458.02 458_03 458.03 458_04 458.04 458_05 458.07 458_08 458.08 458.10 458.12 458.13 458.15 458.17 458.19 458.21 458.23 458.25 o0 U t 6 ; C 7175 N 0 0 0 0.02 0.04 co O O 0.12 0.17 0.21 0.23 0.25 0.30 0.37 0.44 0.51 0.57 0.67 0.78 0.87 0.97 N ,. ,_ 1.39 1.52 1.66 O m C U 215 431 964 1,825 2,687 4,518 00 MN ) O I 0 NO C) Cr, O) O i W r .. C4 16,040 19,163 22,286 24,762 29,177 33,915 37,684 42,423 49,099 55,129 60,513 66,221 72,251 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 279,818 279,836 279,881 279,954 280,026 280,181 280,253 _ 280,407 280,562 280,634 280,734 280,888 281,152 281,415 281,678 _ 281,886 282,258 282,658 282,975 283,374 283,937 284,445 284,899 285,380 285,888 ) NC j 0 m > U 215 431 964 1,825 2,687 4,518 5,379 7,210 9,040 9,902 11,086 12,917 16,040 19,163 22,286 24,762 _ 29,177 33,915 _ 37,684 42,423 _ 49,099 55,129 I. 0 N N (00 (00 C U N N co fN0 LO CO (NO M T CO 862 1,831 1,831 862 1,185 1,831 co co M M 3,123 2,477 4,415 4,738 3,769 4,738 CO 0 n CO (O (O 5,384 5,707 6,030 Flood Hydrograph Flow cfs Csi N- r Off) 0 0 1.78 2.87 2.87 6.10 2.87 6.10 6.10 2.87 O- M (O 10.41 10.41 N N 14.72 15.79 12.56 15.79 N O N N 17.95 19.02 20.10 Effective Rain in/hr O O O O O O O O 0.07 0.15 0.07 0.15 LO 0 O O 0 N O O 0.25 0.25 0.25 0.20 0.35 0.38 0.30 0.38 0.53 0.48 0.43 0.45 0.48 Loss Rate in/hr Max 1 Low CO N NN . O O 7 CO N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 YO O) CO CO O O CO CO 7 V O O 0.48 0.44 r- 0) O Lc, I 0 0 N 0) 10 LO 0 0 N N C- O 0 0 CO 0 CO COO 0 . 0 0 0 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 Storm Rain in/hr MM O O 0.28 0.39 0.39 0.46 0.39 0.46 70 O O 0.41 0.46 0.56 0.56 0.56 0.51 COO(O O O COO(CV O O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 104.6 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.32 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) M M I T- 7 )O I- T- 1.5 1.8 1.5 _ 1.8 1.8 1.5 (0 CO. I- T- 2.2 2.2 2.2 2.0 CO I- N CJ V r N CJ M, - 0) 0) 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 N CO O O 0.42 0.50 0.58 0.67 0.75 0.83 ON) O O N- CO 7 N- N CO N- 1.42 1.50 1.58 1.67 r CO ,- ,. 1.92 2.00 2.08 5 10 15 20 N M 35 40 45 50 55 60 00 On 75 80 W m O LO OD _ 105 110 _ 115 120 125 Unit Time Period T N M 0 (0 r-- W O , N, Mr 15 16 19 20 21 22 CO N N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm Lu !\ 10 458.28 458.32 458.35 458.41 458.48 458.55 458.60 458.61 458.62 458.63 458.63 2.33 2.74 3.19 3.71 4.15 4.19 4.20 tkk\\ 138,907 161,413 176,489 178,965 180,796 182,627 182,917 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft CD CD CD CD CD CD CD CD CD CD CD SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 286,695 287,721 CO CO CO CO C6 oi al co C‘I CNA 291,504 293,400 294,671 294,879 295,034 295,188 295,212 «( + co ®;# _ 101,326 119,309 138,907 161,413 176,489 178,965 - C‘71 §g, - a., §_ ; 1) N 7,322 17,983 19,598 22,506 15,076 2,477 >5�Lo0 Flood Hydrograph Flow cfs 31.95 40.56 24.41 59.94 65.33 75.02 Effective Rain in/hr 0.58 1.43 1.20 0.20 0.15 0.15 0.02 Loss Rate in/hr Max 1 Low 1.29 0.44 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 Storm Rain in/hr 0.90 1.75 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 104.6 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.32 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 5.9 2.0 Time Minutes Hours 2.50 2.58 2.67 2.75 LOCO COCV 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 cn 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY (sl CO co \\�\\\\\\�\ w S § Z )) mak\ �g¥0o 2JJ )Ww._1 �`0 )0(00 L. <z W00 c= <! /)kms))§§2§[§ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm y W 0 (p (1) � m> 458.00 458.00 458.00 458.00 0 CO CO 7 7 0 0 cd CO 7 7 0 0 cd CO 7 7 CSI CV 0 0 cd CO 7 7 CSI CV 0 0 cd CO 7 7 CA CV 0 0 cd CO 7 7 458.03 458.03 458.03 458.03 458.03 458.03 `Cr O a0 W Cr 7 Total In Basin cu -ft ac -ft N 0 0 Ci CJ N CO 0 0 Ci O 7 LD 0 0 Ci O (D N 0 0 Ci O CO Cr 0 0 Ci 0 OT- 0 0 0 Nr N 0 0 (O 0 0 r` CO 6 O O) Tm N 6 O N 0) N N 6 O 7 LL] N N 6 CJ 312 687 1,062 1,437 1,812 2,250 2,687 3,125 3,562 4,000 4,437 4,937 5,437 5,937 6,437 6,937 C` C- (0 01 7 O) C` 8,437 8,937 C` N- (00) 7 O) O O) 10,437 f 10,999 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 279,826 279,858 279,890 279,921 279,953 279,990 280,026 280,063 280,100 280,137 280,174 280,216 280,258 280,300 N LD Cr CO M CO O O CO CO N N 280,427 _ 280,469 280,511 _ 280,553 280,595 _ 280,637 280,679 f 280,727 Basin Volume cu -ft 312 687 1,062 1,437 1,812 2,250 2,687 3,125 3,562 4,000 4,437 4,937 5,437 5,937 6,437 6,937 7,437 7,937 8,437 8,937 N- C- 0) 0) 7 0) D)Oi 10,437 10,999 0) E 5 = C > O 0 > N (f) 1,- CO CO (D (f) N- r CO CO (D (— N- CO CO 7 r- r` CO CO 7 7 r- r` CO CO 7 7 r- O CO 0 7 LD O O 0 0 LO LD O O 0 0 LO LD O O 0 0 Ln LC) O O 0 0 Ln LC) O O 0 0 Ln LC) O N 0 (O Ln LC) Flood Hydrograph Flow cfs 1.04 1.25 LD Lf) N N 1.25 1.46 1.46 1.46 1.46 1.46 1.46 1.67 1.67 1.67 n C` 0 0 C- Cr 0 0 C- Cr 0 0 C- Cr 0 0 C- r- 0 CO U) 0 U '(p -0000000000000000000000000 C[ C W NM Ci O MM Ci O MCO Ci O MCO Ci O MCO Ci O CO7777777777777 Ci O Ci O Ci O Ci O Ci O Ci O Ci O Loss Rate in/hr Max 1 Low 0- O O r- r O O r- O N O O O O N N O O O O N N O O O CO N N O O CO CO N N O O CO CO N N O O CI CO N N O O CI CO N N O O CI CO N N O O CI 0 N N O O ('(04 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M M 0 0 Storm Rain in/hr Tm N O O 0.20 0.20 0.20 0.23 CO N O O CO N O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 104.6 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.32 LOW LOSS RATE - PERCENT 85.00% Cn C C Ln :) U W U) a m E N (O CJ CD (O CJ (O CD (O 0- CJ CD n 0- CJ CD n 0- CJ CD n W CJ CD CO W CJ CD CO W CJ CD O CO O CJ O CO O CJ O CO O CJ O-6 O) O O Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 N O 0) O O 1.08 1.17 LD CO N co. 1.42 1.50 1.58 1.67 1.75 1.83 2.00 O (D O Tm N (D O N CO (D O CO 7 (D O 7 LD (D O co co (D O co r- (D O C- O (D O CO D7 (D o 0 co 0 0 co L 0 Unit Time Period c- N CO 7 LD O r CO CA ,_,_ N 13 14 15 16 17 18 Cr,Tm N Tm N N N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm W 0 m m 458.04 458.04 458.04 458.05 458.05 458.05 458.05 458.05 458.05 458.05 458.05 458.06 458.06 458.06 458.06 458.06 458.07 458.07 458.08 458.08 458.09 458.10 458.11 458.12 NI CO mr W W V 7 Total In Basin cu -ft ac -ft CO 00 N N 0 0 0) 0 N M 0 0 N CO M M 0 0 7 (0 M M 0 0 co (O M M 0 0 N- N. M M 0 0 CO 0) M M 0 0 0 N 7 7 0 0 7 N. 7 7 0 0 N CO 10 (0 0 0 CO O O 0 0 N c0 r r 0 0 (0 7 O O) 0 0 0) 7 (0 _ _ N N. (NO CO _ _ N CO N % t- COCO _ _ CO Mr 7 _ _ mr 10 % O W _ _ 10 10 N. CO _ _ 10 (0 N. M 00)) _ _ CO (0 N. Loc- _ _ h CO N. (0 0) ... _ 0) O N N Mr N _ _ N 7 N N 1!) W _ _ O CO N N 100 (0 _ _ 7 M M CO CO N 0) _ _ O (O M 7 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C 0(O7 .1 N (Oj Q` N N a COO NI co. 0 W(1 N N T- CO A. co_ cc.0 0 W(1 N N a0(O to O 01 O 0 co 01 N N M0 100lM O _ co 01 N N (O0 co 01 N N hN cr(O _ _ co 01 N N h CO t- CV �_ N co 01 N N CO 0) t- CV N M co c0 N N 7100 CO V 1O a0 N N N N. O7 (O CO_ a0 N N N n c07O MN O N N N a0 N N N 10 W V 01 N N a0 N N N (0c0 7M W N N M a0 N N N Basin Volume cu -ft 0)N 0) (0 7 O _ N � � mf t- N CO 0c- _ _ N M � � 13,749 14,312 71) h co 0070 _ _ - 10 - 0) O CO0)c- _ _ 10 10 - - M10 CO (0 _ _ 10 (O - - CO(0 7 7 M0) _ _ O O - - 17,545 18,144 19,160 20,592 N. 0) 70 N _ _ N V N N 100 10 N 10(0 _ _ 00 O N N Nct O 10� _ _ 7 M M 37,283 40,798 N E 5 C UO O N co co LO N N co co co LO N N co co LO LO N N co O LO Lo N N W OD c-.- N N W OD c-.- N O) W m c- 0) D) 0) 0) LO LO to N M O W d1 7 7 00 c0 to to (0 0 N N N N N N 00 0 O O N N W to O to M Flood Hydrograph Flow cfs (nO W 1.87 1.87 1.87 1.87 1.87 1.87 07 (O O O CO (O O O 07 O O N O O N N 3.38 4.77 O O 6 (O 7.55 7.55 8.94 8.94 11.72 N 077777777 U '1p L M a' .2 W 0 0 0 0 0 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 10101000 0 0 0 O 0 0 0 O 0.-.-.-.- 0 O 1010000 0 O c - 0 O N N 0 0 NM N N 0 0 Loss Rate in/hr Max 1 Low co 10 NN . O O 10 10 N N O O 10 10 N N O O 10 00000000T- N N O O N N O O N N O O N COCOCOCOM O O T- T- O O 0.34 _ 0.37 0) 0) O O N N 7 7 O O 0.45 _ 0.45 0 7( . O O M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 Storm Rain in/hr 0.26 0.30 O O M M 0 0 O O M M 0 0 O O M M 0 0 co co M M 0 0 (0 co M M 0 0 0.33 0.36 0 co co M O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 104.6 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.32 LOW LOSS RATE - PERCENT 85.00% O C C 1n N U W 7p0) CL a a m a 00) 0 0 00) 0 0 00) 0 0 00) 0 0 OOO T- T- cp. T- T- O777 T- T- T- T- NM T- T- 'et 710100(D T- T- T- T- T- T- es. 0 T- Time Minutes Hours 2.08 2.17 N co N N 2.42 2.50 2.58 2.67 r 00 N N 2.92 3.00 3.08 3.17 N co M M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 10 O NM c - c - 10 O M(0 10 O c (00000.1.000) c - 10 O c - c - 10 O c - c - 10 O c - c - 10 O c - c - 10 O 0)00 c - N 10 O N N 10 O N N N 10 O NM N N 10 O M7710 N N 10 O N N Unit Time Period N CO N CO 29 30 31 32 co M 35 36 M CO 39 40 41 42 CO V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J L. x N m> IN cd 06 1O 0 7 7 IN cd 00 1O 0 7 7 NN cd 06 1O 0 7 7 458.26 458.28 MM roc) 1O 0 7 7 458.35 458.39 77 corn 1O 0 7 7 458.53 458.60 458.61 458.62 (NO(NO Mco N O 7 7 458.62 458.62 Total In Basin cu -ft ac -ft CO CO C1 T-. T- T- 7 O NM T- T- (D 0 7 (O T- T- CO r N-bO T- T- N r OT- N N CO MN CO CO N N 00)) N N M CO CO In CD M 7 N 0)_ 7 7 0). 7 7 0 1O 7 4 44,730 49,079 CO (C. 00 10 O CO COM0 75,405 81,420 CONn W 0)) 103,632 114,647 126,912 140,427 156,025 175,373 179,305 179,867 N 0 0 180,742 180,867 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 283,569 283,935 284,337 284,738 285,175 285,647 7 O N CO T- CO O O O CO N N 287,202 287,779 288,532 289,460 290,493 291,632 292,947 294,577 294,908 _ 294,955 294,987 _ 295,013 295,029 295,040 Basin Volume cu -ft 44,730 49,079 CO (00 10 (OO N. (0�) (60 (00 75,405 81,420 CONn CCO 0)) 103,632 114,647 126,912 140,427 156,025 175,373 179,305 179,867 N O 0 0 180,742 180,867 . E 3 15 O N 0) M 0 6 6777 (O to CO CO 1- 1` N O) CO 0 X 0 (O OO(O (O 1O 0 0 N O 6 7 7 CO OOO-(4<6�� N 1O 6 0 0 0 1O O N L° O 0 (O M N M N 0 0 M IO N N I MM r O CO CsI Flood Hydrograph Flow cfs Cc (OO CO CO 17.27 18.66 O O N N 21.44 _ 22.83 29.77 36.72 40.88 45.05 0 C4 ,t 1O 3 Cc N n O 1.25 1.04 0.62 0.42 11) iC .;'(p .E Q' C W OOO MM 0 0 MM 0 0 1000 7777066600 0 0 0 0 7 0 0 O1;r 0 0 0 77 N1n 7 600000 0 0 MN 0 0 0 0 Loss Rate in/hr Max 1 Low 10 (O() O O 0.59 0.59 (N 0 O (0 0 0 (OO (00 0 0 O6 r 0 0.- 0.87 1.01 CD Cc W 1.32 1.58 1f) N O O 0.17 _ 0.14 0.08 0.06 N N M M 0 0 N N M M 0 0 N N M M 0 0 N N M M 0 0 N N M M 0 0 N N M M 0 0 N N M M 0 0 N N M M 0 0 N N M M 0 6 N N M M O 6 N N M M O O Storm Rain in/hr (60 (00 O O O N.O O O.- 0.73 0.76 0.79 0.79 0.83 0.86 O T- N M 1.56 1.85 CO6CO0 O O 0.20 0.17 O— 0 O O RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 104.6 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.32 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 0106 ,-N NN 2.2 2.3 77 N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 0)O) ,-CJ 0.6 0.5 MN 00 Time Minutes Hours IO CO N CO 7 V N 0 7 O 7 V CO N- 1O 0 7 V 1O CO 6 0 7 V N 0 0) 0 7 (0 CO 6 0N- (0 (0 IO CO N CO (0 (0 N 0 7 0 (0 (0 CO N- O 0 1f) I!) IO CO 6 CO 1f) 4) N O 0) O 1f) (o O 0 1D 0 N N O 0 CO 6 N N O 0 6 CO N N 1O 0 CO 0) N N 1O 0 0) 0 N CO 1O 0 0 CO CO 0 0 N CO CO 0 0 N M CO CO 0 0 CO 7 CO CO 0 0 7 4O CO CO 0 0 1D O CO CO Unit Time Period LO LO 53 54 55 56 57 58 (0 0 O(D N CD 63 64 0 CO CO 67 _ 68 COD0 lr EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C U U C U U U O raj .0 E O (v) (p 0 (V 6 N 6 co.NO) J N ( O O N O V O N7 0 7 0 a cO O PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C W J (>n $ m> 458.00 458.00 458.00 458.00 458.01 458.01 458.01 458.01 458.01 458.01 458.01 458.01 458.02 458.02 458.02 458.02 458.02 458.03 458.03 458.03 458.03 458.04 458.04 458.04 458.04 458.05 458.05 458.05 458.06 458.06 458.07 458.07 458.08 458.08 458.09 458.09 458.10 458.10 O e- OO N up V 7 e- N N up up 00 OO Nup V 7 V Total In Basin cu -ft ac -ft O e- O O O O 0.02 0.03 0.03 0.04 Cn CO O O O O I` 00 O O O O 0 0e- O O O N O O 0.13 0.15 CO OO O O 0 e- _— N O O 0.22 0.24 0.26 0.28 0.30 0.32 0.34 0.36 0 e- CO 7 O O 0.44 0.47 0.50 0.54 0.58 0.61 CO CO CO CO O O m CO CO I— O O I, O CO I` co co O O O 200 499 0) CO 0) ,— 1,498 1,797 2,097 2,496 2,896 3,295 3,795 4,294 4,793 5,293 0 O) r, CO Cn CO 0 W 0) CO Cfl r 8,388 9,187 9,786 10,485 11,284 12,083 12,982 13,880 N- W V CD N- 0)) O 19,173 20,471 6i CO V M N N 25,064 26,762 cco 0) co. W N N CO 0O) O CO CO 33,492 34,989 36,164 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.16 C 0.00293 Low Loss Rate (percent) 85.00% 279,817 279,842 279,867 279,901 279,926 279,951 279,977 280,010 280,044 280,078 280,120 280,162 280,204 280,246 280,288 280,338 280,389 280,448 280,507 280,574 280,625 280,683 280,751 280,818 Off) ^O CO 0 O O CO CO N N 281,054 281,138 N T- N N CO CO CO N N 281,415 281,525 281,651 281,777 N in in CP O N CO CO N N T N N W N 282,330 282,496 282,622 282,748 282,847 Basin Volume cu -ft O DO) 0) O ,— V 0.., ,— N— 2,097 2,496 2,896 3,295 3,795 4,294 4,793 5,293 r M Cn CO 0) COD CO - 8,388 9,187 O V O 6 7 co N O ,— 12,982 13,880 14,879 15,878 16,876 17,975 19,173 20,471 21,969 23,467 25,064 26,762 28,659 28,919 30,031 31,994 33,492 34,989 11 36,164 Volume In cu -ft 200 300 0 O) 0 O) M CO 300 300 0 0) O 0) 0(00(0 0) 0) 0) 0) 0) 0) 0) 0) V V 0) 0) 0) 0) V V 0) 0) 0) 0) V co 0) 0) 0) CT up O 0) 0) O) 0) O t` 0) 0) 0) 0) 0 co 0) 0) CP 0) r t` 0) 0) 0) CT a0 W 0) 0) O) CT 0 0 CP W O) O 0 OO W Q) N Ocr)O W V V CO C 0) O0 COD 1,897 260 ,- OCO ,_ D) CO) CO LO V V Flood Hydrograph Flow cfs N CO N CO 0 0 0.33 0.44 CO CO M co 0 O 0.33 0.44 0.44 0.44 0.55 0.55 0.55 0.55 0.55 0.67 I� CO CO h O O 0.78 0.89 r CO CD h O O 0.89 0.89 0 0 0 0, ,_,_,_,_,_ T- N , N 1.33 1.44 CD CO CD COI- CO 0) CO T- 0) e- N N O 1.24 2.18 CD CO CO CO N C 15Ucp 1 K .0 W 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 co co 0 0 0 0 co co 0 0 0 0 co M 0 0 0 0 0.04 0.04 0.04 0.04 CD O O O O 0.03 0.05 7 7 co O O O O O O Loss Rate in/hr Max I Low O N CO O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O O O O O 0.075 0.075 0.075 0.075 0 O O O 0 0 O CO O 0 0 0 0 O O N 0 0 0.090 0.105 O O N N O O 0.135 0.135 O O In CO 0 0 O CO up co 0 0 O CO co O) 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 In CO O N N O co O O O 0.559 0.553 0.546 0.540 0.534 0.527 N N LO N O O 0.508 0.502 0.496 0.490 0.484 0.478 0.472 0.466 0.460 0.454 0.448 0.443 COCOO V V O O 0.426 0.420 0.414 0.409 00)) V CO O O 0.392 0.387 0.382 0.377 0.371 0.366 0.361 0.356 0.351 0.346 0.341 0.336 CO N N CO CO CO O O O Storm Rain in/hr CO M CO N O O O O 0.053 0.071 co co CO N O O O O 0.053 0.071 I— n O O O O 0.088 0.088 0.088 0.088 co co CO O O O O 0.106 0.123 co N V O O 0.106 0.123 V V O O O) 0) CO N O O CD O I� n O O CD V r 0) e- O O N 0) e- N N N O O CO C0 CD O N N O O 0.282 0.300 0.335 0.353 0.370 0.388 CO CD CO O co CO N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 314% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 CO CO O O CO I, O O 0.7 0.8 CD n O O 0.8 0.8 CA 0 0 0 0 0 � T- 0 >— T- T- 1.2 1.3 CO N T- T- O r T- T- O) O T- N e- N N N CO CD ,. T- -N L') C) 2 0.25 0.50 Cn O 1,... O O.— 1.25 1.50 1.75 2.00 2.25 2.50 LO O r O N M 3.25 3.50 LO O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 LO O r O O n 7.25 7.50 LO O r O r W LO O N CD 0 N 8.75 9.00 9.25 9.50 r, 0 r O) O N CO O O Time Minutes 15 30 45 60 O O O 135 150 165 180 0 O N 225 240 255 270 285 300 CO O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 CO O,r CD cco co Unit Time Period N co V CO CO I, CO O) C"- T- N T- T- M V T- T- 15 16 I,. CO T- T- 19 20 N N N CO V N N 25 26 27 28 29 30 N CO CO CO 7 CO CO 35 36 I,- c0 CO CO 39 40 N M V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J 3 (nW m 7 7 11) 00 V V 458.13 458.14 458.14 458.16 458.18 458.21 458.24 458.28 M M 00 N V V 458.36 458.39 458.41 458.44 458.47 458.49 458.51 458.52 458.54 458.54 458.54 458.54 458.54 458.54 458.54 458.55 458.55 458.55 458.55 458.55 458.55 _ 458.55 458.55 458.56 458.56 458.56 458.56 458.56 458.56 458.56 458.56 Total In Basin cu -ft 1 ac -ft 0.86 0.88 O 7 0) 0) 0 0 CO O) 0) CD 0 1.23 1.41 0) (O00 ,. s. 2.18 2.30 N 7CO N N 2.78 2.96 3.13 3.28 N nk1f) M M 3.60 3.60 N CO CO M M 3.63 3.64 3.65 3.66 3.67 3.68 0) O (Onnn M M O M M 3.72 3.72 3.73 3.74 3.74 3.75 (1) CO N- nnn M M M 37,517 38,380 39,416 41,114 41,827 47,368 N 7 N. (...• CO CO- n- 0 0 70,308 82,494 94,839 100,017 105,349 113,496 121,128 128,907 136,166 142,904 149,117 152,806 156,632 157,032 157,431 157,731 158,030 158,530 159,029 159,528 159,928 160,327 160,726 161,026 161,226 161,525 161,925 162,224 162,424 162,724 163,023 163,323 163,523 163,822 164,022 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.16 C 0.00293 Low Loss Rate (percent) 85.00% Percolation Area sf 282,961 283,034 283,121 283,264 283,324 283,791 284,328 284,991 285,724 286,751 287,791 288,227 288,677 289,363 290,006 290,662 291,273 291,841 292,364 292,675 292,998 293,031 293,065 293,090 293,115 293,158 293,200 293,242 293,275 293,309 293,343 293,368 293,385 293,410 293,444 293,469 293,486 293,511 293,536 293,561 293,578 293,603 293,620 .0 E v 37,517 38,380 39,416 41,114 41,827 47,368 CV n- 70,308 82,494 94,839 100,017 105,349 113,496 121,128 128,907 136,166 142,904 149,117 152,806 156,632 157,032 157,431 157,731 158,030 158,530 159,029 159,528 159,928 160,327 160,726 161,026 161,226 161,525 N N O) N N N V n 163,023 163,323 163,523 163,822 164,022 Volume In cu -ft 1,353 863 1,037 1,698 713 5,541 6,373 7,869 00)) O (0(0 W cq 12,345 5,178 5,332 8,147 CD CON n ^ r _ 7,259 6,737 6,213 3,689 N 0) W 0) (.6 CO O O O) O CO CO 300 499 499 499 O) 0) O) 0) M M O) O O) O M M 200 300 0) O 0) O M CO 200 300 300 300 O O O O O O N CO N Flood Hydrograph Flow cfs 0 CO (n °3 �o��ocD (00) 7 O O 0 (D n 7, _ 7.08 8.74 _ 9.66 13.54 _ 13.72 5.75 _ 5.92 9.05 _ 8.48 8.64 N- 0) 0 7 aon(oa 0 0 0 n- 4.25 0.44 V CO V CO o0 0.33 0.55 0.55 0.55 a 7a a l 0000 CO a CO 0.22 0.33 0.44 0.33 N MMMN N MMMN 0000000 MN CO N Effective Rain in/hr O O O O 0.03 0.04 O n- O O 0.17 0.21 0.23 0.32 0.33 0.14 , N O O 0.20 0.21 0.19 0.18 CO O, O O O. 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 0.510 0.345 V O CO d' O O 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 (00 (00 OO 0 0 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 M 7 M 000 O O O 0.317 0.312 0.308 0.303 0.299 0.294 0.290 0.285 0.281 0.277 0.273 0.269 0.264 0.260 0.256 0.253 0.249 0.245 0.241 0.237 OO MM N N O O 0.227 0.223 0.220 0.217 0.213 0.210 0.207 0.204 0.201 0.198 0 MOn O) 0) 0 0 CDOCOOCOnn 0 0 lO NON(OM 0 0 0 0 I's n 0 0 0 Storm Rain in/hr co 1) M CO CO O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 1f) CO O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 M N- 0, 0 O O n 1f) 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 n 1f) 0 0 O O 0.035 0.053 0.053 0.053 M 1f) M 0 0 0 O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 314% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 O) n N co. 10 N N (0 CO N N 2.9 3.4 V CO M N CO n (V N 2.6 2.6 L0 ,t N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 Cl CO N O O O 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O 0 O N 4 7 N 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O 0 O N 00 W N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O 10 O Co! N 10 N N N Time Minutes (00 n (O (D 690 705 720 735 750 765 780 795 810 825 840 855 870 885 O O) O) 930 945 (00 n O) O) 00) O O) O 1020 1035 1050 1065 W 00) O O 1110 1125 1140 1155 1170 1185 1200 1215 M 7 l CO0n 00) l CV Cql Unit Time Period 44 45 46 47 48 49 50 51 N M (0 0 V U) (0 (0 56 57 CO 0 (0 (0 0 (O (O N CO (O (O 64 65 CO n (O (O CO 0) (O (D LL OL N M n n 74 75 CO n n n CO O n n O CO 00 82 83 V (0 CO CO CO CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm m J W 40 458.56 458.56 _ 458.56 458.57 _ 458.57 458.57 458.57 458.57 _ 458.57 _ 458.57 Total In Basin cu -ft ac -ft 3.77 3.78 I-� m W 3.80 3.81 CO OD O7 M O7 M M 07 164,821 165,020 165,220 165,420 165,620 165,819 CO 0) N N M U) O N 7 co co (O (O CO O Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.16 C 0.00293 Low Loss Rate (percent) 85.00% Percolation Area sf 293,646 293,662 293,688 293,704 293,721 293,738 293,755 293,772 293,789 293,805 0, y = N N M U) 164,821 165,020 165,220 165,420 165,620 165,819 O CO O(7, m z U co co (00 COO Volume In cu -ft 300 200 300 200 200 200 200 200 200 200 Flood Hydrograph Flow cfs M N 0.33 0.22 0.22 0.22 0.22 0.22 0.22 0.22 M N O O Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 0 6 0 6 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low _ 0.045 0.030 0.045 0.030 0.030 0.030 _ 0.030 0.030 0.030 0.030 Or COO COO((00 0.163 0.162 O ((00 0.159 0.158 O O O O O O Storm Rain in/hr CO O 0.053 0.035 0.035 0.035 0.035 0.035 (n (n 0 0 CO CO O O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 41.59 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 4.78 UNIT TIME -PERCENT OF LAG 314% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) CO N CO N N N N N N N 0 0 0 0 0 0 0 0 0 0 0Z 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 W 0)) O) 00)) 93 94 CO) 00) 5 5 5 5 a C U U C V U U U r- 0 0 0 as 0) (0 0) (O N 7 .- 2 7 0 W N 03 N CO F,:.1 O O �U) 0)`— OjO ( (0 � O (n (00 m• CO - O W W 2' O W LL W d M d O Q BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: BASIN B BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 458 0 0 279,800 0 0 0.00 459 1 1 24,605 304,405 292,016 292,016 6.70 WHERE: V= l(E1—E2)(141+A2 +.lAiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 BASIN F DA -C & DA -F 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 5 B 6 B 9 B 2 B 4 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT PAVING/HARDSCAPE 1.455 D 56 0.51 1.00 SF - MEDIUM DENSITY 4.092 D 56 0.51 0.40 SF - HIGH DENSITY 2.159 D 56 0.51 0.50 LANDSCAPING 2.485 D 56 0.51 0.10 PAVING/HARDSCAPE 0.353 D 56 0.51 1.00 SF - LOW DENSITY 42.760 D 56 0.51 0.30 LANDSCAPING 1.698 D 56 0.51 0.10 LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION 1,350 ft 675 ft 464.0 ft 455.0 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AREA 451.0 ft 65,060 sf 452.0 ft 71,195 sf 453.0 ft 77,490 sf 454.0 ft 83,940 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 427,268 208,194 BASIN F [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -C & DA -F [3] AREA - ACRES 1.10 55.002 [4] L -FEET 215,291 4.94 1350 [5] L -MILES 197,108 4.52 0.256 [6] La -FEET 201,651 4.63 1.11 675.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.128 [8] ELEVATION OF HEADWATER n/a 464 [9] ELEVATION OF CONCENTRATION POINT 15.99 455 [10] H -FEET 453.73 2.73 9 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 35.2 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 5.93 [13] L"LCA/S^0.5 0.006 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 1.6 0.07 [16] LAG TIME -MINUTES 4.0 [17] 100% OF LAG -MINUTES 4.0 [18] 200% OF LAG -MINUTES 8.0 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR 6 -HOUR I 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 287,508 72,217 427,268 208,194 551,056 331,366 880,492 683,384 EFFECTIVE RAIN (in) 1.08 1.10 1.10 0.99 FLOOD VOLUME (cu -ft) (acre -ft) 215,291 4.94 219,074 5.03 219,690 5.04 197,108 4.52 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 209,295 4.80 1.07 201,651 4.63 1.11 186,456 4.28 1.20 112,227 2.58 1.99 STORAGE PROVIDED (cu -ft) (acre -ft) 223,118 5.12 PEAK FLOW (cfs) n/a 96.73 82.80 15.99 MAXIMUM WSEL (ft) DEPTH (ft) 453.83 2.83 453.73 2.73 453.55 2.55 452.59 1.59 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 1 1 LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 1.5 1.6 1.6 1.6 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE CO N CO 0 0 0 c o 0.0196 0.0370 CO CO 0- 0 LO o d 0.0253 0.6415 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00335 (24-(T/60))^1.55 + 0.18 in/hr Undeveloped Condition: Low Loss = 90% II L H H o 3 o J JII J C H °oE2 m G J y m U a�0iE, m: > •m Cii) Od d C 0 > y Y LOW LOSS RATE PER RCFC/2322 0.1000 0.5800 0.5000 0.8200 0.1000 0.6600 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED DEVELOPED DEVELOPED DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) CO CO 0 0 O O 0.0110 0.0210 0.0003 0.2894 0.0143 0.3617 1 AREA WEIGHTED AVERAGE 0.026 0.074 0.039 0.045 or. o r O O 0.031 co a w ce 1.455 4.092 2.159 2.485 0.353 42.760 co a) coa • 55.002 SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.33 0.28 0.46 0.05 0.37 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] =000eoo 00 O V 0 0 u, ,_ 0 0 O M 0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 N N 0 0 N N 0 0 N 0 RI NUMBER [Plate E-6.1] co co LO LO co co u u co CO u LO CO Lr) LAND USE PAVING/HARDSCAPE SF - MEDIUM DENSITY SF - HIGH DENSITY LANDSCAPING PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] 0] CO CO CO CO CO CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W 2 N m 451.06 451.14 (0(0 (0.)., V R 451.44 451.59 451.76 452.01 452.42 453.62 453.78 453.83 (0 S= 0.09 0.22 M LLO )-0, 6666,-.-Nm- OOO,-.-NVCC N m m" V 4.71 4.80 N Fm C U 3,878 9,477 15,647 22,389 30,275 39,880 51,778 68,553 co N W 204,963 209,295 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 455 458 462 466 471 477 484 495 513 566 573 576 455 458 462 466 471 477 484 495 513 566 573 576 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 65,450 65,955 0)M N )- OR 00 67,830 68,695 69,768 71,275 N 0). M N-03 82,535 82,881 Basin Volume cu -ft M M V W O O N 30,746 40,357 52,263 69,048 0) r T CO O ON) 205,536 209,870 0) ZS ZS 0 U 4,332 6,057 MM° ONO ON N r N M° W 12,382 17,270 31,645 93,172 N N N 00) cci- ,_ a Flood Hydrograph Flow cfs 14.44 20.19 22.11 24.02 27.86 33.61 41.27 57.57 7 N O 10 N (r0) V ,_ 0) C U '0)t Oct5 W 0.26 0.36 0M0)- m—,1 -Loco dodo 0.74 1.04 00 0) (O -o 0.80 0.29 Loss Rate in/hr Max 1 Low 0.53 0.62 M M 66666.- r W m 0 1.92 5.07 m N O O 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 Storm Rain in/hr 0.62 0.73 r W O O M 0)) O O-'- - a N O) L() 7 00 — 0 RCFC & WCD FIVDG011 Ctrl UAILIAML DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.36 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) co N M(0 4.4 4.6 0. 0)0 6.4 8.1 13.1 34.5 1,-00 O M Time Minutes Hours 0.08 0.17 N M NM 66 0.42 0.50 W N- M(onrorn0 66666.- N M N O '..)-x-O N N M 35 40 45 50 55 60 Unit Time Period 1- N <M V 0) 0 I� W 0n N 0 U U } 0 I0 O� 7 NMN 0 0 • O 0) 0 0 0m • ON (00{ N a_ O) T • I� N 0) m M ([) Oj • N n N N fA N W 2 J 0 O r O Q O O J 0 LL W W 0 ~ Z (90 w Z W W* Q I- O CU Lu L 0) (77(gf~A gZW U Q (0>>0"4)L<CQQJ LL F Z J W O O 0 Y Q M w0<OU J JWL,(L'JO> PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm NUJ c>o CO 0000 0 0 0 0 451.01 451.03 451.03 451.05 451.07 451.06 451.07 451.09 451.13 451.17 451.22 451.25 451.32 451.39 451.44 451.52 0N- 0 .1- 451.82 451.91 452.01 5 0 U @ C C N 0.01 0.02 0.02 0.02 0.02 0.05 0.05 0.07 OO O O O mr O O 0.20 0.27 0.34 0.39 0.49 0.61 O co O 0 0 0) mr 0 1.28 1.42 1.57 Om N 4t U 381 761 mr 0CN 00)0 OO(V 0 2,047 3,266 4,484 4,420 03 0 030 00�) 7(O 8,924 11,847 14,767 16,832 21,457 26,507 30,272 35,316 42,919 49,663 O CO 0 NO t00 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 452 453 CO CO V) 0 0 0 CO CO 0 0 0 0 M .71- 0 0 0 0 455 455 455 456 458 460 461 463 466 469 471 474 479 483 487 491 495 452 453 453 453 453 453 453 454 455 455 455 456 458 460 461 463 466 469 471 474 479 483 487 491 495 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 65,135 65,169 65,192 65,187 65,181 65,291 O O O 0) N CO 1f1 1n CO CO 65,505 65,499 65,532 65,642 65,905 66,169 66,432 66,618 67,035 67,490 67,829 68,284 O r co I. W O O 0) CO co 70,108 70,677 71,278 C E 4 2; U CO 0 O Q,- c00 O o V (00 o N 0. 2,501 3,720 4,939 4,875 5,238 6,456 9,382 12,306 15,228 17,294 _ 21,923 26,975 _ 30,743 35,790 _ 43,398 50,146 _ 56,036 62,349 69,085 CU co M coco 705 391 co N. 000000000(0(0(0((,010 CO r CO r CO co N. N N CO O M M N I- CO 01 M N O 0( 1n 10 4,236 5,518 8,082 7,227 CO o n 1. O N CO O N O O r- Flood Hydrograph Flow cfs 2.78 2.78 00) 0 M (0 N', 0 CO 00 10 11'i 0 0 00 10 4'i 5.58 1.30 CO CO 0- 10 N 4'i 11.27 11.27 11.27 8.42 01 0 0 0 01 cam+) 0 0 N. 26.94 24.09 21.24 22.67 24.09 Effective Rain in/hr 0.05 0.05 0010I0(00001100 000.-0,-.-00.- 0 0 0 0 0 0 0 0 0 0 0.20 0.20 0.20 0.15 0.31 0.33 0.25 0.33 0.49 0.43 O,- CO CO a d- O O O Loss Rate in/hr Max 1 Low 0000) NN O O NCO O O 0.33 0.39 0.33 0.39 0.39 0.33 LO 0) CO CO70 O O OO O O 0.48 0.44 0- 0) 0010 0 0 N0) OI 0 0 NO -0000 0 0 CO OO 0 0 0 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 Storm Rain in/hr MM O O 0.28 0.39 0.39 0.46 0.39 0.46 CO M O O 0.41 0.46 0.56 0.56 0.56 0.51 CO c0 O O CN00 O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.36 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) M M I T- 7 LO. I- T- 1.5 1.8 1.5 _ 1.8 1.8 1.5 O CO. I- T- 2.2 2.2 2.2 2.0 CO I- N N V r N N CO M M 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 N M OO 0.42 0.50 0.58 0.67 0.75 0.83 ON) O O','' 0 7 N CO ' 1.42 1.50 1.58 1.67 r CO N 1.92 2.00 2.08 5 10 15 20 N M 35 40 45 50 55 60 c00 0- 75 80 W 0) O CCD _ 105 110 _ 115 120 125 Unit Time Period T N 0/ .1. OO N- CO 0) I. N, � 15 16 N. 19 20 21 22 NN N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J w m v) 1 00 452.16 452.36 452.47 452.78 453.10 453.45 GO ,- c O N ai of vvvvv N M M n r n ai ai ri U 0 16 C C N ro m ,- N 2.37 2.89 3.45 4.11 M CO a Ni 4.60 4.63 4.62 Om N C 1) U 80,016 94,851 103,272 125,779 150,409 178,868 197,490 199,447 200,549 201,651 201,464 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 502 510 515 529 543 559 569 570 571 571 571 502 510 515 529 543 559 569 570 n N- n 101010 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 72,246 73,504 74,217 76,125 78,172 80,448 81,937 82,093 82,182 82,270 82,255 C U y J ON m O 0 > 80,517 95,361 103,787 126,308 150,952 179,427 198,059 200,017 in N N M .-c.16 N N N N N E 5 C 3 Z U N a 0 M L4 M M m0 c N 25,173 29,018 m N m _ N r r 10 cOtON Flood Hydrograph Flow cfs 39.76 51.15 m m n 10 oi<o N N- M 01 w ai0)10 CO 0) I, - N m V c0 5.58 5.58 1.28 Effective Rain in/hr N. 0) 0 0 L CO 0.- 1O I 1.15 0.15 X� O 666 Loss Rate in/hr Max 1 Low 01001000 010100- 6.-6,-,-.- 1.29 0.44 001) Com.- 666 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 Storm Rain in/hr 1010 O N — ,- 0.90 1.75 n. - 00 — N 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.36 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 MN 0- co 5.9 2.0 0c0 c0 .- m- O Time Minutes Hours N N N M V N N 2.50 2.58 2.67 2.75 10 m 0 1'10110 O c0 M M ..- 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 NCO M M 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C U UC U U U M f„9 0 COO M 0 M c0 M CO O N 00 cp c00� �� NO Nd170 a N N N W H Z 0 ww w~ 00 Z W W O O 1700 O O 7 Z W �J c>OOWWw0Omw LL0O W W 2iL) C7 Z _ -,IC w O�OL,JJwwWO> 1 cowcLCLW W 2dHQ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C lJ o .= CO> 451.00 451.00 451.00 451.00 451.00 451.00 0 0 N 17 7 7 0 0 N 17 7 7 0 0 N.7 7 7 N 0 0 N.7 7 7 451.03 451.03 0 0 N V 7 0 0 N V 7 451.04 451.05 451.05 I 451.05 Total In Basin cu -ft ac -ft 0 0 000000000000000000000000 0 0 0 0 0 0 0 0 0 0 0 N N 0 0 N CO 0 0 CO 7 0 0 a 10 0 0 O 10 0 0 CO CO 0 0 r r 0 0 OD 0) 0 0 O ONO O M V N O O OO O O O O N O0) .CO mr .-.-.-.-.- r CO Lc, 0M co Ori OO .- co N N M, N W N N O11) O N M M V 7 r M M Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 413 452 N N V V N N V V N N V V M co V V M co 7 V M co 7 V M co 7 V 453 454 454 454 454 454 454 N N a 7 to 10 a 7 N to a 7 N to a 7 N to a 7 N to a 7 N to a 7 N� a 7 N 10 mt 7 N 10 mt 7 N 10 mt 7 N� mt 7 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 65,097 65,105 65,109 65,113 65,117 65,128 65,139 65,151 65,162 65,173 65,185 65,204 N m - N V N N 1. 10 CO CO 65,260 65,279 65,297 _ 65,316 65,335 _ 65,353 65,372 _ 65,391 65,409 f 65,436 Basin Volume cu -ft 413 496 540 584 627 754 880 1,006 1,133 1,259 1,385 1,593 1,802 2,010 2,218 2,426 7 N 0 N N 3,050 3,257 3,465 3,672 3,879 4,169 (1) E 4 C j O 0 > _M O co 7 V O O O) co 7 V O 0) O) r 7 N 0) 0) r r 1O (O 0) 0)0)v- r r 1() (O r (o 1() CO (O (o O CO (O (o O CO (O (O O CO (O (O O O (O (O O O V (O V O r Flood Hydrograph Flow cfs CO 1011)10 CO O O D 1.65 1.93 MM O m MM 0 O) CO O O N N. N 0000000000 N N N N N N N N N N N N N N N N N N N N 2.20 2.48 (1) C Q9 -0000000000000000000000000 M Q' .E W N M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M 7 0 0 7 7 0 0 7 7 0 0 7 a 0 0 7 a 0 0 7 a 0 0 7 a 0 0 Loss Rate in/hr Max 1 Low r O O r r O O r 0 N O O 0 0 N N O O 0 0 N N O O 0 M N N O O CO M N N O O CO M N N O O M M N N O O M M N N O O M M N N O O M 10 N N O O M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 Storm Rain in/hr N. N O O 0.20 0.20 0.20 0.23 N N O O N N O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.36 LOW LOSS RATE - PERCENT 85.00% O C C (4) C) U W 4) a a m 0 (O O 0 0 CO O 0 0 CO r 0 0 N., N, 0 0 N., N... 0 0 r OD 0 0 CO OD 0 0 CO (0 0 0 COO 0 0 COO 0 0 COO 0 0 COO) 0 Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 N O O) O O 1.08 1.17 IO M N M 1.42 1.50 1.58 1.67 1.75 1.83 2.00 O O O O N O O N C0 O O CO V O O 7 O O O O O O O co r O O r 0 O O CO O) O 00 O 00 0 0 Unit Time Period m- N CO V (O O r CO O F N 13 14 15 16 17 18 0) N I. N N N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J m cn m 451.06 451.06 451.07 451.07 451.07 451.08 451.08 451.09 451.09 451.10 451.10 451.11 7 7 451.10 451.10 451.10 451.11 M 7 V 7 451.17 451.20 N N V 7 _ 451.31 I 451.36 Total In Basin cu -ft ac -ft Cr, O 0 0 O 0 0 N N 0 0 CO 0 0 c- 0 0 0 (D I- 0 0 CO I- 0 0 0 0 0 0 0^ 0 0 N N 0 0 N CO 0 0 0 V 0 0 CO (0O 0 0 O 00))N (h V 4,499 4,788 5,077 5,365 5,654 5,942 6,312 6,683 7,053 7,423 7,792 7,379 0 1. 00)00M 0 0 NOr co. 1 8,620 _ 9,859 11,647 _ 13,434 L6 0 20,991 f 24,425 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 000000 0 0 V V 0 0 V 7 0 0 V 7 0 0 0 0 V V 0 (.0 0 0 V V h I. 0 0 V V r n 0 0 V V 0 (.0 0 0 7 V 0 r 0 0 V 7 CO 0 0 V V 0) O 0 0 V V NC) 0 0 V V 0 N- 0 0 V V 455 455 455 455 455 455 456 456 456 456 457 457 457 457 456 456 456 457 457 458 459 460 462 463 465 467 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C o , CO O d y 0< y 0 V 0 lc) 00 V V N (0 0 0 CO N OM 0 0 0 0 0 0 CO V 0c0 0 0 0 0 0 0 0 CO M CO CO (0 (0 0 0 0 CO h0 CO r (0 0 0 0 CO 0(0 MI -O0 r r 0 0 0 0 CO CO I. (0 0 0 0 0) NO) r CO 0 (n 0 0 VCO OO1-cO0 n r 0 0 CO CO W 0) co Q) (0 0 CO CO N r CO 0 0 CO CO N CO NM N r 0 0 CO CO Co N 00 Cr, CO 0 r CO CO Basin Volume cu -ft 4,376 4,665 4,954 5,243 O OOO O Ir 7,509 7,879 8,249 7,836 7,423 7,010 7,148 7,838 0)6 12,106 13,895 16,233 18,570 CV � NN m n C j 15 0 V 0 V 0 r 7 V 7 V r r 7 V 7 V r r 7 V 7 V r x n N- N N 0 0 r r N N 0 0 r N V 0',',,, 7 V (O (O 0) 0, I' r (0D (00 W c0 N NM N N 0 0 N ,,,,r":. 0 N r M Flood Hydrograph Flow cfs 0 0 N V N N 0 0 7 V (V N 0 0 7 V (V N 0 0 7 V (V N 0 0 I- r N N 0 0 r r N N 0 0 r N O 0.15 0.15 0 N Cr, CO T- M 0 0 0 0 0 0 7.49 7.49 Co CO Co CO 0) 0 MEM 13.00 m C7 U wi L W Q' C W 7 000000000000000000,-,-,-,-.- o O 7 7 o O 7 7 o O 7 7 o O 0 0 Ci O 0 0 Ci O 0 0 Ci O 0 0 Ci O6 7 1- O 0 0 o O 7 7 o O 1-- ,- o O o M N N o 0 Loss Rate in/hr Max 1 Low Co 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 N CO O O CO CO O O 0.34 _ 0.37 0) 0) CO CO O O N N 7 V O O 0.45 _ 0.45 0 7 0 O O 0 0 0 0 0 0 0 0 0 0 . . 0 0 . . 0 0 . . 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr 0.26 0.30 0 0 M M 0 0 0 0 M M 0 0 0 0 M M 0 0 Co CO M M 0 0 Co CO M M 0 0 0.33 0.36 CO 0 CO0 O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.36 LOW LOSS RATE - PERCENT 85.00% 0 C C (n m U W 752 CL a a m F_ W 0) 0 0 0)0) 0 0 0)0) 0 0 0)0) 0 0 00000'7'7'7 T- T- T- T- T- T- T- T- NM,t T- T- 700001- T- T- T- T- T- T- T- Time Minutes Hours 2.08 2.17 co co N N 2.42 2.50 2.58 2.67 r 0 N N 2.92 3.00 3.08 3.17 co CO (0 M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 0 0 NM 0 0 0 co mr 0 0 0 c 0 0 0 0 0 CO N. 0 0 x CO 0 0 CO 0 .- 0 0 0) 0 N 0 0 O N N 0 0 N N N 0 0 N (h N N 0 0 0 7 N N 0 0 7 0 N N Unit Time Period N N N N 29 30 31 32 CO M 35 36 (0 CO 39 40 41 42 CO V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C JN .yw (D f/) 1 m> O 77 N N 7 7 451.56 451.63 N 1-O N N 7 7 451.90 452.00 O,- ,NMN N N N N 7 7 N CO N N N N 7 7 01 N 1-0) N Nei N N 7 7 453.19 453.50 7 1O NNNNNN Cf N N 7 7 7 7 C7 M N N 7 7 7 CO C7 M N N 7 7 Total In Basin cu -ft ac -ft N (0 OIC 0 0 h 0) 000),-N7N 0 0.- N (0 T- N- N- T- CO 1-0) N- T- (D (0 � 70 N N O 0) (0 N co CO 0) (NN co 7 O GO 7 7 O C0 NN 7 7 0- (0 NN 7 7 28,407 32,937 38,016 43,091 N. M CO OO(7 W a 7 O N W 000 75,571 83,377 M N rn Mn O)� r NOON �� CO BOO' 0 Lo 7 O(O' 186,389 186,240 cy iN1) NN OO Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O CO N. N. 7 7 (O 0) n N. 7 7 co (O CO 10010010(00(0(0(0(0(0(0 7 7 N 7 7 0) 7 7 N O CO N N h (0 N N 1- N N CO 0) N N CO 0) N N CO N N N OM h r..1` 7 7 (O01 1` 7 7 M(0N co OCD 7 7 O) 7 7 0)7 CO O 7 10 O CO TT TT N 10 0- CO N M N 10 h 70 N 10 MM O CO N N MM CO O N N MN CO O N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf O CO 0- CO O N: O 10O 68,527 68,985 69,492 70,048 70,653 71,255 O A. 0-M 00 O N T- N h N. 73,426 74,553 75,820 77,226 78,787 80,729 81,040 _ 81,055 81,049 _ 81,037 81,012 80,980 Basin Volume cu -ft 28,877 33,410 N 0 0) N. 7 N W M 7 0 0 0) N. CO O) N 7 N 0 0) CD O CO N O O O 0- CO O co0 CO M h CO _ 94,442 107,752 122,707 139,307 0 m 0) u, oo 186,838 187,019 QN)CO (0(0 M 186,488 186,090 E = C . O O N CO N O a O 7 1n 7 7 N N N In (C) N N 0 O N )- (O O O 1- r O O N N 1- r co o N O 1` CO r CO cow)N, g O .- co,o N 7 7. W 4- CO_. 00 (7 N N 7 7 7 7y c--- co co O) 7 7 co N 7 O N Flood Hydrograph Flow cfs 14.84 _ 16.68 18.51 18.51 Mc- N N 0 0 N N 25.86 _ 27.70 36.88 46.07 51.58 57.09 N COO (00 CON 00 CO 7 N N CO O `,..2 0.83 _ 0.55 (1) C .C.,'5 L g Q' C U.1 1.0 NM 6 0 MM MM 0 0 1-0 0)7777N 0 0 MM 0 0 1-- 01- 0 0 CO CO CO 0 0 MM W O 0,-,-,- 0) 0) N7 1.7 NOOOOO 0 0 MN 0 0 ..- 0 0 Loss Rate in/hr Max 1 Low 1V) (01 O O 0.59 0.59 (NO (NO 0 0 (00 (00 0 0 On r 0 0 0.87 1.01 O- W .-.- 1.32 1.58 10 N O O 0.17 _ 0.14 0.08 0.06 M 0 0 M 0 0 M 0 0 M 0 0 M 0 0 M 0 0 M 0 0 M 0 0 M 0 0 M 0 0 MMMMMMMMMMMM 0 0 Storm Rain in/hr CO 00 (00 O O O N.O O O 0.73 0.76 0.79 0.79 0.83 0.86 (MO O c- '-,-'-,- N M 1.56 1.85 CO O O 0.20 0.17 TT OT O O O RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.36 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 0)O ,-N NN (V N 2.2 2.3 77 N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 0)O) )-CJ 0.6 0.5 MN 00 Time Minutes Hours N CO N CO 7 V N 0 7 N 7 V O 1- N O 7 V N CO N. O 7 V N 0 0) 0 7 10 CO 1. 0.- ui 10 N CO N CO ui 10 N 0 7 N ui 10 CO 0- N O ui I!) N CO I. CO ui I!) N o O O 10 (O N O N O N N N O CO 1- N N N O 1. O N N N o O O) N N N o 0) 0 N CO N O O CO CO N O N CO CO N O N 0) CO CO N O co 7 CO CO N O 7 N CO CO N 0 N CO CO CO Unit Time Period N 53 54 55 56 57 58 0NNO 10(D 0(D 63 64 CO CO 67 _ 68 (0I 0-rN - EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C U U C U U U 1 f; ((00 N w O ( C0 c00( N 10 c O M_ O CO N 7 M 0 N c c7, 7 W a N M N M a) PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C N W 4 0] 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.00 451.01 451.02 451.03 451.04 451.05 451.07 451.09 451.11 451.09 451.10 I 451.11 451.13 Total In Basin cu -ft ac -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O N O O O O CO 7 O O O O 0.06 0.08 7 O O 0.17 0.14 (0 1- O ,- N O O O O O O O 0 O 0 O O O O O O O O O 0 O O O O O O O O O O O 0 95 1 O O) N 0) 2,669 3,550 4,692 5,965 O O CO N I: O O 0) I- CO 7 O O N. O Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 264 396 396 528 O O 0) O) CO CO 396 528 528 528 O O O O O0 O O O O O0 O N O O) O1.-... N 0) N r W U)u) �u^) N O Q) N u) O N N W 1,057 1,057 COO O c- N N COCO N CO COCO 1,359 1,359 1,360 1,362 U0 cM0 O CO CO 1,367 1,369 1,372 1,370 T- 1- r r CO CO CO 1,356 1,356 1,356 1,356 1,356 1,356 1,356 1,356 1,356 1,356 I� 1` u) N coM r 1` u) N ch M r 1` u) N ch M r 1` u) u) ch CM N 1` 10 u) c" ) CM N 1` 10 u) c" ) CM N 1` 10 u) c" ) CM CO CO 10 u) c" ) CM CO CO 10 u) c" ) CM CO CO 10 u) c" ) CM 1,359 1,359 1,360 1,362 CO u) O c0 co co 1,367 1,369 1,372 1,370 N V 1- r r-- `ch co co M ,- SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.18 C 0.00335 Low Loss Rate (percent) 85.00% 65,084 65,096 CO CO O) O O.- u) N O CO 65,096 65,096 CO CO O) 0 O r u) N O0 CO CO 0 O u) N O0 Cr, O) u) N O0 O) O) u) N O0 (r , CO u) N O0 65,131 65,143 65,143 65,155 65,131 65,143 65,155 65,155 65,167 65,167 65,179 65,179 65,179 65,191 N- V N- V N N u) (0 O O 65,300 65,356 65,423 65,503 65,606 65,721 65,847 65,743 65,798 65,853 65,967 Basin Volume cu -ft 264 396 396 528 O O 0) O) co M 396 528 528 528 O O O0 O O O O O0 O O O N O O) O 1� N u) 0) N r W U) N O O) CV N u) 0) N I"- 0) 1,057 1,057 COO O .- N N M M 1,321 1,453 1,680 2,038 2,660 3,281 CO T- O 0) 7 7 6,059 7,334 8,738 7,580 0) O co O O ro Volume In cu -ft 264 396 396 528 O O 0) 0) CO CO 396 528 CO COO N N 0 O O O 0 0 O O O O O O O N O 0) OI.-- 792 925 U) u,1--- N O 0) N u) (3) N P.... O 1,057 1,057 OO T- N N COCO N 0 CO V 1,585 1,717 OO 0) 0) CO V r- N 2,509 2,641 2,774 213 COO V 0) 0) O Flood Hydrograph Flow cfs 0.29 0.44 0.44 0.59 0.44 0.44 0.44 0.59 0.59 0.59 00 CO I- I\ . O O 00 CO r I\ O O 0.73 0.88 CO CO COO O � 1.03 1.17 CO CO COO O � I- h T- T- � � N N CO COV T � 1.47 1.47 I� O � � O I- O) � � 2.20 2.20 2.35 2.49 O) CO r O) N N 3.08 0.24 O O CO N N 0) . N N N N C o 1 K .0 W 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 co co 0 0 0 0 co co 0 0 0 0 co M 0 0 0 0 0.04 0.04 0.04 0.04 0.05 0.05 0 0 O O O O 7 7 10 O O O O O O Loss Rate in/hr Max I Low O N CO O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O O O O O 0.075 0.075 0.075 0.075 10 0 O 0) 0 0 0 u) 0) 0 0 0 U) O O N 0 0 0.090 0.105 O O N N O O 0.135 0.135 O O 10 u) 0 0 O u) 10 0 0 0 O u) a0 0) 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 U) u) O N N O CO O O O O CO O O O O 0.624 0.617 0.609 0.602 m CO u) N O O 0.581 0.574 0.567 0.560 0.553 0.546 0.539 0.532 0.525 0.519 0.512 0.505 0.499 0.492 0.486 0.480 0.473 0.467 O(0 V V O O 0.448 0.442 0.436 0.430 0.424 0.418 0.412 0.407 0.401 0.395 0.389 0.384 CO CO c(0 CO CO CO O O O Storm Rain in/hr 10 co CO N O O O O 0.053 0.071 co co l0 N O O O O 0.053 0.071 I. 1` O O O O 0.088 0.088 0.088 0.088 CO CO CO O O O O 0.106 0.123 CO N' O O 0.106 0.123 V V O O 0) 0) In N O O CO O r 1` O O CO V r 0) T- O O N 0) = N N N O O In (0 CO O N N O O 0.282 0.300 0.335 0.353 0.370 0.388 In (0 CO O O 4) N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 l0 CO O O O 1. O O 0.7 0.8 CO 10 O O 0.8 0.8 O) O 0 0 O O � T- O � T- 1.2 1.3 In N T- N. O 1` %. N. 0) O T- N c- N N N l0 0 ,. T- N N 0 2 0.25 0.50 IO O r O O T- 1.25 1.50 1.75 2.00 2.25 2.50 O O r O N M 3.25 3.50 O O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 O O l".... O O 1. 7.25 7.50 O O l"... O r O O O N O O N 8.75 9.00 9.25 9.50 O O r Q) O N O O O Time Minutes 15 30 45 60 LO O O O 135 150 165 180 O O N 225 240 255 270 285 300 l0 O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 l0 O CF O (00 CO Unit Time Period T- N 00 'Cr In O t` CO CO C"- c- N c- c- C) V c- c- 15 16 I,- O ,- c- 19 20 N N N CO V N N 25 26 27 28 29 30 N CO CO CO 7 CO M 35 36 N- 00 CO M 39 40 N CO V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J UJ COO O CO 0 7 7 CO O O U7 7 7 451.21 451.26 M V N O O 7 7 451.56 451.74 451.93 451.98 452.04 452.14 452.23 452.32 452.40 452.48 452.55 452.57 452.59 452.58 452.57 452.55 452.53 452.52 452.51 452.50 452.48 452.47 452.46 452.44 452.42 _ 452.41 452.40 452.38 452.36 452.35 CO CV 452.30 452.29 452.27 Total In Basin cu -ft 1 ac -ft co O N N 0 0 0 co N co 0 0 0.32 0.41 0.53 0.69 I- co 0 n— 0 s— 1.46 1.54 N 0) co. h c- O n- co n- c- N 2.25 2.38 2.50 2.53 2.58 2.55 2.53 2.50 2.48 2.46 co n- 7 7 N N 2.39 2.37 2.34 2.32 2.29 2.26 7 N N N N 2.18 2.16 CV CV 0 U) N 0 0 0 N N N 9,961 11,092 12,220 13,083 14,076 17,928 22,902 29,872 37,953 50,654 63,571 67,032 0) 770 1.--0) O N f� r W 7 ,-N co CO 98,175 103,801 108,752 110,388 0-M N 0) N 110,161 108,999 107,839 106,945 106,053 105,162 104,141 103,121 102,103 100,956 99,678 98,535 97,525 96,386 95,116 93,981 92,847 91,716 90,455 89,328 88,071 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 1,377 1,379 1,381 1,383 1,384 1,392 O V 7 V 1,429 1,453 1,477 1,484 1,490 1,504 1,516 1,528 1,539 1,549 1,558 1,561 1,564 1,562 1,560 1,558 1,556 1,555 1,553 1,551 1,550 1,548 1,546 1,544 1,542 1,540 1,538 1,536 1,534 1,532 1,530 1,528 N CO N O O O 1,377 1,379 1,381 1,383 V N CO W CO CO V 0 O 7 7 1,429 1,453 1,477 1,484 1,490 1,504 1,516 1,528 1,539 1,549 1,558 1,561 1,564 1,562 1,560 1,558 1,556 1,555 1,553 1,551 1,550 1,548 1,546 1,544 1,542 1,540 1,538 1,536 1,534 1,532 1,530 1,528 O co n - N N N O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.18 C 0.00335 Low Loss Rate (percent) 85.00% Percolation Area sf n— co 0 co O L— (0 (0 co 0 66,285 66,363 66,453 66,800 67,249 67,878 68,608 69,754 70,920 71,230 71,543 72,173 72,746 73,338 73,872 74,350 74,770 74,909 75,065 74,977 74,889 74,791 74,692 74,617 74,541 74,465 74,379 74,292 74,206 74,108 74,000 73,903 73,817 73,721 73,613 73,516 73,420 73,324 73,217 73,122 73,015 g j m; V 0 co 7(OO7 e- e- co e- e- 15,460 19,319 co co co N N CO 39,382 52,108 65,048 68,515 72,209 79,648 86,420 93,403 99,714 105,350 110,309 111,948 113,791 112,755 111,721 110,557 109,396 108,500 O co CO r O— ,— 105,690 104,669 103,649 102,500 101,220 100,074 co 0CV 0))_ 96,650 95,512 94,377 93,244 91,980 90,851 89,592 Volume In cu -ft 2,641 2,509 2,509 2,245 2,377 5,244 U7 V M CO CO0 0 0 _ 9,510 14,155 14,394 4,945 5,178 8,929 8,276 8,499 7,839 7,175 0 0 O — O 0 M 3,403 528 528 396 (O O 0) (O M OO O O (O (O 0 (O CO 0 N N U) O 528 396 264 396 528 396 264 396 • CCO 7 0 7 (O 0) (O N CO N Flood Hydrograph Flow cfs 2.93 2.79 2.79 2.49 2.64 5.83 7.08 9.32 10.57 15.73 co O) 0 7 U) 5.75 9.92 O7 N 7 0) (A r I- co W I'- 7.23 3.55 3.78 0.59 0.59 0.44 0.44 0.73 co co I- r (7 (J 0.59 0.59 0.59 0.44 0.29 0.44 07 O 7 6 (J 0.29 0.44 0.44 0.44 0)70) N 7 N 6 6 6 Effective Rain in/hr 0.05 0.05 0.05 0.04 O 0 0 co 0 0 0.19 0.28 co CD 0 0 N- 00 0 0 0.17 0.17 0.16 0.14 , 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 06 C0 CD c 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 O LO V O CO O O U7 0 V O M 7 O O 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 0 (0 CO(0 0 0 O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 7 LO M 0 0 0 O O O 0.362 0.357 0.351 0.346 0.341 0.336 0.331 0.326 0.321 0.316 n- O CO CO O O 0.302 0.297 0.293 0.288 0.284 0.280 0.275 0.271 ((00 (MO N N O O 0.259 0.255 0.251 0.247 0.244 0.240 0.236 0.233 0.230 0.226 0.223 0.220 0.217 0.214 0.211 0.208 0.206 0.203 0 00) 00) N O O O Storm Rain in/hr 1M M CO 0 O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 CO CO O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 M n M 0 O O n 1M 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 � CO 0 0 O O 0.035 0.053 0.053 0.053 M 1M M 0 0 0 O O O RCFC & WCD C,11ff IDGiCMOOfn1W DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 co I- N. OOOO N N N N 2.9 3.4 V MM M N N. N N 2.6 2.6 07 N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 N MN co O O 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O O O N 7 7 N 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O O O N 0 0 N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O O O O N O N N N Time Minutes COOn 0 CO 690 705 720 735 750 765 780 795 810 825 840 855 870 885 0O O OO 930 945 (00 nC CO O O O 1020 1035 1050 1065 W 00) 0 0 1110 1125 1140 1155 1170 1185 1200 1215 CV CV COOn0, N CI CV l. Unit Time Period 44 45 46 47 48 49 50 51 040)U) O O O O 56 57 O010 0 0 ,-- 0 0 CO 0 0 64 65 0I.O0) 0 0 CO 0 LL OL N M I� r 74 75 0I -O0)0 � n N- I'- CO 00 82 83 700 CO 0 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J W co 0) X 452.25 452.24 452.22 452.20 452.19 452.17 452.15 452.14 N O N N CO >CD V V Total In Basin cu -ft ac -ft O h 7 CO CO 1.83 1.80 1.77 1.74 O O) Nc- CO. O) c- OO W c- c - 86,948 85,695 84,576 83,328 82,081 80,837 79,5_95 78,355 77,117 75,882 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O) I- CD CO 1,511 1,508 1,506 1,504 N O (O 17 (O (O O O O O 1,519 1,517 )O CO 1,511 1,508 1,506 1,504 N O (O U7 O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.18 C 0.00335 Low Loss Rate (percent) 85.00% Percolation Area sf 72,920 72,813 72,718 72,613 72,507 72,401 72,296 72,191 72,086 71,981 C N N E m ; U 88,467 87,212 86,091 84,840 83,592 82,345 81,101 79,859 78,619 77,382 Volume In cu -ft 396 264 396 264 264 264 264 264 O O N N Flood Hydrograph Flow cfs 0.44 0.29 O) 0.29 0.29 0.29 0.29 O) O) N O O N N O O Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Loss Rate in/hr Max I Low 0.045 0.030 _ 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 V N 0 CO (O )O 0.184 0.182 0.182 0.181 O) O) O cO W cO 0 0 0 0 0 0 Storm Rain in/hr CO IO 0.053 0.035 0.035 0.035 0.035 0.035 )O )O 0 CO 0 0 O O O O RCFC & WCD C,11ff IDGiCMOOfn1W DRAINAGE AREA -ACRES 55.00 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) co N CO N N N N N N N 0 0 0 0 0 0 0 0 0 0 c0 o2 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 93 94 CD W 0)) 0) C)) 00 0)) >- x 5 5 5 5 C U U C V U V U V U E Q N 70 Nc Nr- 0O) Nj 7 O) FA (,2 ,2 N N O N O M O 7 N N N N (n COO (cDD 0)— �03 W 0 J 0 > w 0 Q O ce 0 06 zO W W CO 00 z �Q WiO Q JjZ WW HO UOOag Ce W ZOWm»(j(j NZWw > §8>OOWWwocw 0 ,- i i (n J m (� W J U. O O O O < F WFZJWLLI-QO OW 2WLLWCCdMdQ BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: BASIN F BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 451 0 0 65,060 0 0 0.00 452 1 1 6,135 71,195 68,104 68,104 1.56 453 1 2 6,295 77,490 74,320 142,425 3.27 454 1 3 6,450 83,940 80,694 223,118 5.12 WHERE: V= 17E1—E2 Al+Az+AiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 BASIN D DA -D 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 3 B 1 B 6 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT PAVING/HARDSCAPE 2.588 D 56 0.51 1.00 WATER FEATURE 2.323 D 56 0.51 1.00 COMMERCIAL 4.803 D 56 0.51 0.90 SF - HIGH DENSITY 7.637 D 56 0.51 0.50 LANDSCAPING 11.052 D 56 0.51 0.10 LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION 780 ft 390 ft 459.5 ft 453.0 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AREA 451.0 ft 101,190 sf 452.0 ft 112,495 sf 452.5 ft 135,570 sf 0.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 220,641 85,691 BASIN D [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -D [3] AREA - ACRES 1.28 28.403 [4] L -FEET 119,475 2.74 780 [5] L -MILES 132,086 3.03 0.148 [6] La -FEET 134,950 3.10 1.25 390.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.074 [8] ELEVATION OF HEADWATER n/a 459.5 [9] ELEVATION OF CONCENTRATION POINT 10.24 453 [10] H -FEET 452.23 1.23 6.5 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 44.0 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 6.63 [13] L"LCA/S^0.5 0.002 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 0.04 [16] LAG TIME -MINUTES 2.5 [17] 100% OF LAG -MINUTES 2.5 [18] 200% OF LAG -MINUTES 5.0 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION I 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 148,469 28,994 220,641 85,691 284,565 152,510 454,686 322,600 EFFECTIVE RAIN (in) 1.16 1.31 1.28 1.28 FLOOD VOLUME (cu -ft) (acre -ft) 119,475 2.74 134,950 3.10 132,055 3.03 132,086 3.03 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 119,475 2.74 1.41 134,950 3.10 1.25 132,055 3.03 1.28 132,086 3.03 1.28 STORAGE PROVIDED (cu -ft) (acre -ft) 168,719 3 87 PEAK FLOW (cfs) n/a 52.25 45.06 10.24 MAXIMUM WSEL (ft) DEPTH (ft) 452.10 1.10 452.23 1.23 452.20 1.20 452.20 1.20 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0091 0.0082 0.0304 0.1344 0) M 0 0.5012 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00260 (24-(T/60))^1.55 + 0.14 in/hr Undeveloped Condition: Low Loss = 90% II L 0 J o 3 o J J II J C H o E 2 A' o3ym d o m:2> •m aNO a' d C 0 Y > ;5 G m LL O LOW LOSS RATE PER RCFC/2322 0.1000 0.1000 0.1800 0.5000 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0046 0.0042 0.0164 0.0754 0.1806 N 04 O 1 AREA WEIGHTED AVERAGE 0.091 0.082 (0(0 N O O 0.389 co W Q coce M N N 4.803 7.637 O o 7 N SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.05 0 CO x- N O O 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 0 0 O O 0 0 CO 0 O- PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 47 47 O O 4) O RI NUMBER [Plate E-6.1] CO (0 4) 4) CO CO ((7 ((7 CO (f) LAND USE PAVING/HARDSCAPE WATER FEATURE COMMERCIAL SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] O] O] 0:10:100 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm TO LU CO 451.03 451.06 451.10 451.14 451.19 451.25 451.31 451.40 § ) 452.08 452.10 0.25 0.35 0.47 0.60 0.76 0.98 1.38 2.50 2.67 2.74 )� 10,865 15,278 33,269 42,879 59,912 108,718 116,249 119,475 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 101,500 101,904 102,340 102,807 CO 0 CO CD Ci Di 104,712 105,729 107,532 113,212 116,019 117,221 Basin Volume cu -ft 2,929 6,748 10,865 15,278 20,285 26,183 33,269 42,879 59,912 108,718 116,249 119,475 o o 0 ; 0 2,929 3,820 §} « •« 5,007 5,898 /2 < a 17,033 48,806 7,531 3,226 Flood Hydrograph Flow cfs CO 13.72 14.71 25.10 10.75 o }J 2 0.34 0.44 0.48 0.51 /2//LO 1.98 5.68 0.88 0.38 Loss Rate in/hr Max 1 Low 0.53 0.62 CO CO Ol •Cr CD 1.92 5.07 CO CO 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 Storm Rain in/hr 0.62 0.73 RCFC & WCD UAILIAML DRAINAGE AREA -ACRES 28.40 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.52 UNIT TIME -PERCENT OF LAG 198.4 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.28 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.4 4.6 6.4 8.1 13.1 34.5 Time Minutes Hours 0.08 0.17 0.42 0.50 35 40 45 50 55 60 Unit Time Period PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J V, W CO CO 451.00 451.01 O O V7V7 O O 451.05 451.06 451.08 451.09 O.- V7m 451.13 451.16 co N V 7 451.23 451.26 451.29 451.32 451.37 451.41 451.45 451.49 451.53 U M ; C t0 y 0.01 0.02 0.02 0.04 0' O O 0.12 0.15 CO N O O 0.24 0.27 CO M O O 0.44 0.49 0.56 0.64 I' N- 0 0 O 0,-,-,- O N Om m C 452 904 915 1,809 2,702 4,258 5,151 6,706 8,262 9,155 ((00N N W ((00 N r- 19,138 21,135 24,456 27,997 CO co V 39,282 43,706 47,688 51,891 56,315 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 101,238 _ 101,286 101,287 _ 101,381 101,476 _ 101,641 101,735 _ 101,900 102,065 102,159 102,277 102,442 102,700 102,958 103,216 _ 103,427 103,779 104,154 104,459 104,833 105,348 105,817 106,238 106,683 107,151 0 N E p> m ; PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm !\ 451.59 451.67 451.72 451.84 451.97 452.10 452.18 452.20 452.21 452.23 452.23 o 1.45 1.65 1.77 2.06 2.37 2.73 2.98 3.02 3.06 3.09 3.10 0 CV CD N- 77,088 89,675 103,366 119,042 129,644 131,641 133,196 134,752 134,950 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft CD CD CD CD CD CD CD CD CD CD CD SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 107,877 _ 108,789 109,350 110,683 112,132 117,060 121,010 121,754 122,333 122,913 122,987 «§ +_ 2! ®22 77,088 89,675 103,366 119,042 129,644 131,641 133,196 134,752 134,950 )_ \Q% $ o6a 5,306 12,587 13,691 15,676 7b§ e,_,_,o ]m Flood Hydrograph Flow cfs 45.64 52.25 5.18 5.18 0.66 Effective Rain in/hr o 0.62 1.47 1.59 1.82 1.23 0.23 0.18 0.18 0.02 Loss Rate in/hr Max 1 Low 1.29 0.44 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 Storm Rain in/hr 0.90 1.75 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 28.40 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.52 UNIT TIME -PERCENT OF LAG 198.4 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.28 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 5.9 2.0 Time Minutes Hours 2.50 2.58 2.67 2.75 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 CV 01 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY N\\�\01 01 \\\\\�\ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm y) j Cll >O CO 451.00 451.00 0 0 7 7 0 0 7 7 0 0 7 7 451.02 451.03 451.03 451.03 0 O 7 7 451.04 451.04 451.05 451.05 451.05 451.06 451.06 451.06 451.07 I 451.07 Total In Basin cu -ft ac -ft O 0 0 Ci 0 N N 0 0 0 0 CO 7 0 0 0 0 a (0 0 0 0 0 CO (0 0 0 0 0 r CO 0 0 0 0 O) 0) 0 0 0 0 OT- 0 0 N_ N M_ 0 0 Mt 0 0 (O CO 0 0 CO N- 0 0 CO O N ( (O N N. r N CO (— M M N (n N— (O V CO CO CO m- x— N co N CO Cr, 7 N. N N N CO N- O Cr, M M 7 (0 (0 h O M V h CO 0) Cr, M 7 V 0) N- N O V (O O N 70 CO 0 N- m- (O (O r (0 CO r, (O (O CO CO N N- N N- r Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 101,213 101,240 101,267 101,294 101,321 101,353 a O CO A. Cl. a O O 101,448 101,479 101,511 101,547 101,583 101,619 101,655 101,692 101,728 101,764 101,800 101,836 101,872 101,908 101,945 f 101,960 Basin Volume cu -ft 213 470 726 _ 982 CON CO CO N (n (O V CO CO CO ,- x— N M N CO CO 7 N. N N N CO N. O M,- M M 3,714 4,055 4,397 4,738 5,079 5,421 N 7 CO 0 (O O 6,445 6,787 CO CO N )- ,- N N- r C) E 5 C) C 0'—(0(0(0(00)0)0)0)0)0)(0(00(0(0(0(0(00(00(0 O 0 > co (ID N N CD (JD N N CD 0) N N 0) 0) N N 0) 0) N N 0) N CO CO CO CO CO CO CO CO CO CO CO 10 M Flood Hydrograph Flow cfs (0 n0 0 0 0.85 0.85 (O 0 co000000� 0 0 0 . N 0 0 . N 0 V . . N 7 V . . N 7(0 . . � N 0(0 . . NN 0(0 . . � N mr 0 . . � N 1.14 0.48 I 0 .C.5',1 L Q' C W N CO 000000000000000000000000 0 0 CO CO 0 0 CO CO 0 0 CO CO 0 0 CO CO 0 0 M(0 0 0 0(0 0 0 0(0 0 0 0(0 0 0 0(0 0 0 0(0(0 0 0 N 0 0 Loss Rate in/hr Max 1 Low N. 0- O O r r O O n O N O O O O N N O O O O N N O O O CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO 0 N N O O (00(00(00(00(00(00(00(00(00(00(00(00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr N O O 0.20 0.20 0.20 0.23 N N O O N CO O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 28.40 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.52 UNIT TIME -PERCENT OF LAG 198.4 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.28 LOW LOSS RATE - PERCENT 85.00% 0) C C LL7 :) U W 4 a a m a 00 0 0 00 0 0 (O0- 0 0 n0- 0 0 n1,, 0 0 nc0 0 0 CO0 0 0 CO0 0 0 CO0 0 0 CO0 0 0 CO0 0 0 COO) 0 Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 N 0 0) O O 1.08 1.17 (O CO N co. 1.42 1.50 1.58 1.67 1.75 1.83 2.00 O O (O O N (O O N CO (O O CO V (O O 7 (0 (O O (O (O (O O co f- (O O r O (O O Co 0) (O N 0) cD 0 0 cp mm � 0 Unit Time Period T- NMV (O 0 f- CO mC'�N 13 14 15 16 17 18 0,CD NNNNN PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J y W 0 0 CO CO 451.07 451.07 451.07 451.08 CO O O 7 7 7 CO O 7 7 451.08 451.09 451.09 451.10 451.10 451.11 451.11 451.12 M V 7 451.16 451.17 451.19 451.21 451.23 451.25 _ 451.27 I 451.29 Total In Basin cu -ft ac -ft x 0 Ci 0 0 0 0 0 0) 0) 0 0 0) O N 0 0 N N N 0 0 M 7 N N 0 0 41 0 N N 0 0 0 O N M 0 0 N 4D M M 0 0 0 N M V 0 0 00 V0 0 0 0 4) 0 0 0 CO N CO r 0 0 4) O f0 0 N` N N 4) O O 4) 0) O h 0 V Cr, O co M 0 N 7O 0 co 7 t0 0 0 O 0 N 0 O V 0 0 OD n V Cr, M 0 6 r h 0 h V 6 •— 0 O 0 NOO f- O N 6 6 0 0 f0 M N` M 0 W 0 CO V O O N N N 0 0 M V 0 N N 0 01 CO t` 0 M Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C 0c0,- .ri N O Q , O a O 0 0 N 0 0 N- CV N V 0 0 N 0 0 0 N.. CO 0 r 0 0 N 0 0 0 00 CO CO O 0 N N 0 0 070cO,- Cr O N N 0 0 Cr CO N N N N 0 0 0 CO O M V N N 0 0 NO CO 4) V 4) N N 0 0 MO 0 0 co 1 N N 0 0 4).- 0 CO O 0) N M 0 0 N. CO N N M 4) M M 0 0 Oto V r N- O M M 0 0 CV 00 M N LO 0 0 0 0 Basin Volume cu -ft 00 0 NS N.: 7,905 8,050 8,194 8,339 8,484 8,629 000 0.; oimoie V M 10,777 11,491 00 N O c‘i c4 0010I. N.- c- Cr, N 00 COOM N CO 40 20,188 22,041 24,178 26,315 28,736 31,442 W E C C ) 15 O 4') 7,r M 4) 4') mr,r 4) 4') mr,r 4) 40 mr,r 0 0 N co 7 Cr 0 0 N co 7 V 0 N Cr r Cr Cr r N- O M O N 0 .-- 0 0 N XI .—.—.- N N 0 r , N N 0 7 N N Flood Hydrograph Flow cfs 1.14 0.48 CO 0 CrV O O 0.48 0.48 CO CO 7 V O O CO CO 7 V T- T- CO Cr, 7 V T- T- CO CO 7 co T- N CO CO M M N N CO CO M N M V CO Cr, N N V) 4) 0- 0- 0 0 7.12 7.12 0- N 0 O 0 O U) C701 U'Np L 0 C w OOOOOOOOOOOOOOOO.— 0 06 NN 06 NN 06 NN 06 4)4) 06 LO LO 06 LO CO 06 CO CO 06 N 4) 06 00 .— 06 NN NN O 4) L000 NN O O NM O O Loss Rate in/hr Max 1 Low co 4) N N O O 4) 4) N N O O 4) 4) N N O O 4) 4) N N O O 0 0 N N O O 0 0 N N O O 0 N Cr, O O CO M O O 0.34 _ 0.37 CO O CO CO O O N N 7 V O O 0.45 _ 0.45 OD mr NO O O N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N . . 0 0 N N . . 0 0 N N . . 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 N N 0 0 Storm Rain in/hr 0.26 0.30 0000000000 M M 0000000000 M M M M M M M M 0.33 0.36 0 0 co co O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 28.40 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.52 UNIT TIME -PERCENT OF LAG 198.4 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.28 LOW LOSS RATE - PERCENT 85.00% O C C LL7 d U NJ 75 U) CL 00 m a 0000000000000777 0 0 0 0 0 0 0 0 T- T- T- T- T- T- T- T- NM,t70 T- T- T- T- co. T- T- co. t0 T- T- N 0 T- Time Minutes Hours 2.08 2.17 N CO N N 2.42 2.50 2.58 2.67 0 CO N N 2.92 3.00 3.08 3.17 N CO M M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 4) O NM 4) O Mmr 4) O 0000 4) O 4) O N -x000000 4) O 4) O 4) O N 4) O N N 4) O N N N 4) O NM N N 4) O M Cr N N 4) O 74) N N Unit Time Period N N N co 29 30 31 32 M M 35 36 M co 39 40 41 42 co V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J w 0 0> 00 0 7 7 451.39 451.42 451.46 451.49 0 0 7 7 451.62 451.67 451.73 451.80 451.88 451.97 452.06 452.17 N N (V (V V 7 N N (V (V V 7 N N 04 N V V Total In Basin cu -ft ac -ft CPN-LOCO7 1� 0 0 0 0) O 0 ,- N .- ,- M V .- ,- 0�x(70 .- ,- N -I0 .- ,- � M N N (00 07) N N 0 0 M M 0COCOM 0 M M 0 0 M M 34,433 37,708 41,267 44,827 48,671 52,800 57,214 61,627 66,325 71,307 77,713 85,541 r,-, 0 N 0 0) I'- CO CO t` N N- N N (- N M CO N Tof 0 00 131,969 132,055 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 104,835 105,182 105,559 105,935 106,342 106,779 107,247 107,714 M NIS 00 00 109,417 110,245 111,164 112,174 CO W 77 (0O ,- N 0 LO CO CO .- N N 121,749 121,829 121,876 121,908 Basin Volume cu -ft 34,433 37,708 41,267 44,827 48,671 52,800 57,214 61,627 66,325 71,307 77,713 85,541 94,223 103,758 114,717 128,236 I -N N I� N M co co CO N 0 co co 0) 0 0 0 O O N co M C 3 j O 100070) W r W N NM 0 0 (O IO MM 7 N 0 (677777 (0M a 7 0(0 W COON c0 0) (OCO 7 0 (6r N(O001 0 M c0 IO O N 6c' CP 0 0) 7 a> (V ) 0 N N 000) 0 0 N 0 Flood Hydrograph Flow cfs 0)) . O) 11.87 11.87 12.81 13.76 . . ,-,-,-,- O 21.35 26.09 28.94 31.79 36.53 45.06 a> 7 CO 0 0 W 1` 0 0 7 N 0 0 N I 0 U'5 L M Q' C W 0 CO MM 0 6 777700001`0) 0 0 (0 CO 0 0 0 0 (O CO 0 0 0 0 0'—'—'— 0—CV0 GO (- IO N (000000 0 0 M N 0 0 0 0 Loss Rate in/hr Max 1 Low 1(M') (0() O O 0.59 0.59 (N 0 0 (O 0 0 (00 (0O 0 0 On CO 0 0 0.87 1.01 O— CO 1.32 1.58 CO N O O 0.17 _ 0.14 0.08 0.06 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 0 0 N N 0 0 Storm Rain in/hr (MO OO O O O N.O O O 0.73 0.76 0.79 0.79 0.83 0.86 O T- ..-,- N M 1.56 1.85 COMCD CO O O 0.20 0.17 O— 0 O O RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 28.40 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 2.52 UNIT TIME -PERCENT OF LAG 198.4 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.28 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 010 ,-N I. NN 2.2 2.3 77 N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 CT! CD ,-CJ 0.6 0.5 MN 00 Time Minutes Hours 1n CO N M 7 0 N 0 7 IO 7 V CO 0- 0 0 7 V 1n CO I- 0 7 V N 0 0 0 7 0 CO 1. 0,- 1n 10 IO CO N M 1n 10 N 0 7 (0 1n 10 CO 0- 1O 0 1n (0 IO CO I- 0 1n (0 N o 0 0 1n 0) 1n O 1n001� N N 1n O N N 1n O x000) N N 1n o N N 1n o 0100 N CO 1n O CO CO 1n O N CO CO 1n O N(+) CO CO 1n O CO774) CO CO 1n O CO CO 1n 0 100 CO CO Unit Time Period ION 53 54 55 56 57 58 O(0D 0(ND 63 64 (00(00 67 _ 68 (O0- nr EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY CN 0 U C„co 0 0 (O55 5 O 1!) N O O O 0 N O V 0 N W< M M M M a V O N F- 2! Z O W W J¢Jw7 (.7 70 >HW w,iZ 0 1J0003w7w10p0p • <0)L>WWWpmwO a005ULTI_O0 ZJ x$$=¢E —Hg0Ww 0 M O w (JL (JL W 2 a O Q PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C N U) $ OP 451.00 451.00 451.01 451.01 451.01 451.01 451.01 451.02 451.02 451.02 451.02 451.03 451.03 451.03 451.04 451.04 451.04 451.05 451.05 451.06 451.06 451.07 451.07 451.08 451.08 451.09 451.10 451.10 451.11 451.11 451.12 451.13 7 N T- V V 451.16 451.17 451.18 451.19 451.20 451.23 451.24 I 451.25 451.26 Total In Basin cu -ft ac -ft O O O O O N O O O O 0.02 0.03 0.03 0.04 In N 0 0 O O CO r 0 0 O O co o0 0 0 O O 0 0e- 0 O O N O O CO_ 7 O O In CO O O CO O r- O O O N N N O O 0.23 0.25 0.26 0.28 0.30 0.32 0.34 0.37 O) N CO 7 O O 0.43 0.46 0.50 0.55 CO O 7 In CO co O O O O V M 546 818 CO QO O N .— .— 1,432 1,705 1,978 2,251 N M O O) N N 7 (O N CO M M 3,956 4,365 4,774 5,252 5,729 6,275 V CMO CO CO I� 7,707 8,253 8,866 9,480 CNO 7 r- CO O- TO 11,526 12,277 OI) NW O O T- T- p CO O O T- T- O) 00 e- N T-,- 18,886 20,063 21,808 24,119 25,142 26,165 27,897 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.14 C 0.00260 Low Loss Rate (percent) 85.00% 101,204 101,226 101,248 101,277 101,298 101,320 101,342 101,370 0) CO Cl. .11. O O 101,464 101,500 101,537 101,573 O N O CO 0 0 0) QD V O t` 0 0 00)) ct U) N O 0 0 CO CO V M O 0 0 102,006 102,064 102,129 102,194 102,266 102,338 102,410 102,490 102,576 102,670 102,778 102,887 103,002 103,125 103,189 103,314 103,499 103,743 103,852 103,960 104,143 Basin Volume cu -ft 136 341 546 818 M CO N N O N N N M O ,II 1,978 2,251 2,592 2,933 3,274 3,615 3,956 4,365 4,774 5,252 5,729 6,275 V CO O C0 [O I: 7,707 8,253 8,866 9,480 10,162 10,844 11,526 12,277 LO N O) CO O O) 10 1 15,005 16,028 O) CO 1 Cq N T- T- 18,886 20,063 21,808 24,119 25,142 26,165 11 27,897 Volume In cu -ft 136 205 205 273 205 205 205 273 r r N N V V M M V V CO CO 341 409 409 477 477 546 409 477 546 546 V V CD CO 682 682 682 750 818 887 N N O O CM O O 00 O 7. 1,745 2,312 CO N M O O n Flood Hydrograph Flow cfs 0.15 0.23 M 0 N CO O O 0.23 0.23 0.23 0.30 O 0 CO CO 0 0 CO CO CO CO 0 0 CO CO CO CO 0 0 0.38 0.45 0.45 0.53 0.53 0.61 LO CO V (O O O CO CO O O 0.68 0.68 CO CO N- N- O O 0.76 0.83 Cr O O,- 0 0 V V N- � � CT N N � � CO CO CO O � 7 I� O CO � N 7 7 N n- s- CT N 15 fC ,,1 a) 2 .0 W 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 CO CO 0 0 0 0 CO CO 0 0 0 0 CO CO 0 0 0 0 0.04 0.04 0.04 0.04 0.02 0.05 I- 0) O O O O 7 7 r, O O O O O O Loss Rate in/hr Max I Low O N O O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O O O O O 0.075 0.075 0.075 0.075 u) O O O O O O u) O O O O u) O O N O O 0.090 0.105 O O N N O O 0.135 0.135 O O (n (n O O O (n (n CO O O O (n a0 CA O O 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 (n (0 O N N O CO O O O 0.497 0.491 0.485 0.479 0.474 0.468 0.463 0.457 0.451 0.446 0.440 0.435 0.430 0.424 0.419 0.414 0.409 0.403 0.398 0.393 0.388 0.383 0.378 0.373 0.368 0.363 0.358 0.353 co 0 V CO CO O O 0.339 0.334 OM N CO CO O O 0.321 0.316 0.312 0.307 0 001 M N O O O O N N N O O O Storm Rain in/hr CO CO CO N O O O O 0.053 0.071 CO CO CO N O O O O 0.053 0.071 = = I` C` O O O O 0.088 0.088 0.088 0.088 CO CO CO O O O O 0.106 0.123 CO = N V O O 0.106 0.123 = = V V O O O) CA CO N O O (0 CO r C` O O (0 V r CA e- O O N CA = N N N O O CO (0 O CO N N O O 0.282 0.300 0.335 0.353 0.370 0.388 CO (0 CO O CO CO N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 28.40 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.52 UNIT TIME -PERCENT OF LAG 595% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 CO CO O O CO (` O O 0.7 0.8 (0 (` O O 0.8 0.8 02 O 0 0 O O � T- O 7 � ', 1.2 1.3 CO N ,. l. CO I- %. N. CA O T- N e- N N N CO (n --N .-- .-- L2 0 2 0.25 0.50 (n O N., O O.— 1.25 1.50 1.75 2.00 2.25 2.50 (P O r O N M 3.25 3.50 (P O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 (P O r O (0 C` 7.25 7.50 (P O r O r CD (P O N (O 00 N 8.75 9.00 9.25 9.50 CO O I0 O) O N CO (0 O O Time Minutes 15 30 45 60 O O O 135 150 165 180 N O N 225 240 255 270 285 300 CO O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 CO 0 (0 CMO CO Unit Time Period e- N CO V CO CO I, CO Cr) O c- N c- M V c- 15 16 I1 W c- c- 19 20 N N N CO V N N 25 26 27 28 29 30 N COMM CO 7 M 35 36 I,- c0 CO CO 39 40 N CO V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J W CO 451.28 451.29 L 451.31 451.31 451.33 451.37 451.42 451.48 LO. (O V V 451.71 451.75 451.79 451.85 451.91 451.97 452.02 452.06 0 CV V V 452.15 452.15 452.16 452.16 452.16 452.16 452.16 452.17 452.17 452.17 452.17 452.18 452.18 452.18 03000300 V V V V 452.19 452.19 452.19 452.19 452.19 Total In Basin cu -ft 1 ac -ft CO N CO I,I,- . 0 0 LO h h 0 0 0 CO 0)O7 0 0 CO h ,- � 1.33 1.54 1.75 1.85 1.95 2.09 2.23 2.37 2.50 2.62 CO co N N 2.88 2.89 2.89 2.90 2.90 2.91 2.92 2.93 CO 7 0) 0) N N 2.95 2.95 2.95 2.96 2.96 2.97 2.97 2.98 2.98 2.99 0) 0) 0 0)0)0 N N M I 29,737 31,229 32,826 33,618 34,968 39,603 44,793 50,992 W LO QD 76,087 80,399 84,805 91,122 97,075 103,118 108,794 114,103 119,044 122,249 CO N O T- N- 126,084 126,288 126,493 126,834 127,175 127,516 127,789 128,062 128,334 128,539 128,675 128,880 129,153 129,357 129,494 129,698 129,903 130,108 130,244 130,449 130,585 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.14 C 0.00260 Low Loss Rate (percent) 85.00% Percolation Area sf 104,338 104,496 104,665 104,749 104,892 105,382 105,932 106,588 107,303 108,269 V O N n 00) O O 110,167 110,836 111,466 112,106 ,T 0 N N M 6 117,060 118,254 119,480 119,582 119,683 119,759 M (MO CO 0) 00 120,090 120,217 CO N M V 00 N N 120,522 120,598 120,649 120,725 120,827 120,903 120,954 121,030 121,106 121,183 121,233 121,310 121,361 0 y m ; U 29,737 31,229 32,826 33,618 34,968 39,603 44,793 50,992 57,744 66,868 76,087 80,399 84,805 91,122 97,075 103,118 108,794 114,103 119,044 122,249 125,538 125,811 W co O N N N 126,493 126,834 127,175 127,516 127,789 128,062 128,334 128,539 128,675 128,880 129,153 129,357 129,494 129,698 129,903 130,108 130,244 130,449 130,585 Volume In cu -ft 1,840 1,492 1,597 792 1,350 4,635 0 000 p 6 6,752 9,123 9,219 4,312 4,406 6,317 5,953 6,043 5,677 5,309 4,940 3,206 W CO N nN (7 273 205 205 341 341 341 273 273 273 205 136 205 273 205 136 205 205 205 CO (0 CO ) n 03 N 0 03 Flood Hydrograph Flow cfs 2.04 1.66 W C, 0 • O 1.50 5.15 N. 0) N, CO (6 (D O'' (n 0 4. 0) OV (` 0 V 4.90 7.02 (O (O (O 6.31 5.90 5.49 3.56 (0 O CO CO M O O CO M N O D 0.23 0.38 0.38 0.38 000 M M O O CO M N O O 0.15 0.23 0.30 0.23 0.15 0.23 0.23 0.23 N M N ,- N s- O O O Effective Rain in/hr r O O O O O CO CO O O O O 0.05 0.18 0.20 0.24 (0 (0 N CO O O CO � CO O O 0.17 0.25 0.23 0.23 0.22 0.21 0 CV O O 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O 0 Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 0.510 0.345 0.345 0.405 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 (00 (00 O O O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 M7M O O O O O O 0.281 0.277 0.273 0.269 0.265 0.261 0.257 0.253 0.250 0.246 0.242 0.238 u) CO CO N N 0 O 0.228 0.224 0.221 _ 0.217 0.214 0.211 0.208 0.204 OD O 0) N 0 0 UD N0 0 0) 0 0 r- W 00 0 0 ..a. W 00 0 0 co (O I'- r 0 0 0.173 0.171 0(0 (0(0(0(0(0 0 0 N 0 0 O 0(07N (O 0 0 (n NO LO 0 0 0 Storm Rain in/hr 1M M CO CO O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 1O CO O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 M N- 03 0 O O n 1f) 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 r- 1f) 0 0 O O 0.035 0.053 0.053 0.053 M 1f) M 0 0 0 O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 28.40 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.52 UNIT TIME -PERCENT OF LAG 595% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 0) N N. co. 6 N N (0 CO N N 2.9 3.4 V CO M N CO N. N N 2.6 2.6 CO ,t N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 Cl M N O O O LP) 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O CO O N ci 7 N 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O CO O N W W N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O CO O O N 1n N N N Time Minutes CO0CO (O (D 690 705 720 735 750 765 780 795 810 825 840 855 870 885 O,- 0 0 930 945 CO0nCO CO 0 O CO 0 1020 1035 1050 1065 W 00) 0 0 1110 1125 1140 1155 1170 1185 1200 1215 CD � OO nCD � � Unit Time Period 44 45 46 47 48 49 50 51 N M (O (0 0 (O 10 (0 56 57 �0)0C'10) (O (0 CO (0 O (0 64 65 CO BOO O (0 O) CO (0 LL OL N M N-. N� 74 75 (O �000)O N-. N- N. F. CO CO 82 83 0 (O(O CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J M 452.19 452.19 452.20 452.20 452.20 452.20 452.20 452.20 452.20 452.20 Total In Basin cu -ft 1 ac -ft O N N N M M M 0000000000 M M M M M M M M M M 130,790 130,926 131,131 131,267 131,403 131,540 131,676 131,813 131,949 132,086 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft C, 0 0 0 0 O 0 O 0 0 CD p p 0 0 0 0 O 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.14 C 0.00260 Low Loss Rate (percent) 85.00% Percolation Area sf 121,437 121,488 121,564 121,615 121,665 121,716 121,767 121,818 121,869 121,920 C N 130,790 130,926 131,131 131,267 131,403 131,540 131,676 131,813 131,949 132,086 22. U Volume In cu -ft 205 136 205 136 (0,0 0 0 0 0 CO CO CO CO CO CO Flood Hydrograph Flow cfs M L() 0.23 0.15 Lf) LO 0.15 0.15 0.15 0.15 N O O O O Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 p p p p p p p p p p Loss Rate in/hr Max 1 Low 0.045 0.030 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 U7 Tr 0.148 0.146 0.145 0.144 0.143 0.142 0.141 0.141 O O Storm Rain in/hr 0.053 0.035 0.053 0.035 0.035 0.035 0.035 0.035 0 co O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 28.40 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 2.52 UNIT TIME -PERCENT OF LAG 595% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) co N CO N N N N N N N 0 0 0 0 0 0 0 0 0 0 c0 o2 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 CO Op) O) N) O 93 94 ff) 01 O 5 5 5 5 C U U C V U U U V 5 Q N N U LO O CO cO O j • 7 CO c N p 0 p CO O fn LO LO M M M C -w W J 0 i W O Q O W W W 0 Z W 00Q W�g Q • J j Z W W Oo KO .<20 Z O W.» <mm,, f Z LUa = §JJ0>OOWWwOQW i i (n J m (� W J U LLQZJL1000 % QF W W �2' O W W W fid MdOQ BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: BASIN D BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 451 0 0 101,190 0 0 0.00 452 1 1 11,305 112,495 106,793 106,793 2.45 452.5 0.5 1.5 23,075 135,570 61,927 168,719 3.87 WHERE: V= l(E�—E2)(141+A2 +.lAiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 BASIN E DA -E 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 4 B 6 B 9 B PAVING/HARDSCAPE SF - LOW DENSITY SF - HIGH DENSITY LANDSCAPING LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION ACRES 1.707 48.170 4.271 7.654 1,560 ft 780 ft 490.0 ft 455.0 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AMC II LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT D 56 0.51 1.00 D 56 0.51 0.30 D 56 0.51 0.50 D 56 0.51 0.10 AREA 442.0 ft 224,555 sf 443.0 ft 231,980 sf 444.0 ft 239,460 sf 445.0 ft 247,000 sf 446.0 ft 254,595 sf 447.0 ft 262,250 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 480,092 237,971 BASIN E [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -E [3] AREA - ACRES 1.10 61.802 [4] L -FEET 240,394 5.52 1560 [5] L -MILES 219,473 5.04 0.295 [6] La -FEET 193,888 4.45 6.27 780.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.148 [8] ELEVATION OF HEADWATER n/a 490 [9] ELEVATION OF CONCENTRATION POINT 17.61 455 [10] H -FEET 442.85 0.85 35 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 118.5 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 10.88 [13] L"LCA/S^0.5 0.004 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 0.8 0.06 [16] LAG TIME -MINUTES 3.5 [17] 100% OF LAG -MINUTES 3.5 [18] 200% OF LAG -MINUTES 7.1 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR 6 -HOUR I 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 323,053 82,659 480,092 237,971 619,184 372,822 989,349 769,875 EFFECTIVE RAIN (in) 1.07 1.08 1.10 0.98 FLOOD VOLUME (cu -ft) (acre -ft) 240,394 5.52 242,121 5.56 246,363 5.66 219,473 5.04 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 221,456 5.08 5.49 193,888 4.45 6.27 172,408 3.96 7.06 59,359 1.36 20.49 STORAGE PROVIDED (cu -ft) (acre -ft) 1,216,389 27.92 PEAK FLOW (cfs) n/a 108.26 92.62 17.61 MAXIMUM WSEL (ft) DEPTH (ft) 442.97 0.97 442.85 0.85 442.76 0.76 442.26 0.26 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 1 1 LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.5 0.6 0.8 1.0 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0028 0.5144 0.0346 0.1016 M m d -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00341 (24-(T/60))^1.55 + 0.18 in/hr Undeveloped Condition: Low Loss = 90% II L H H o o J II J E H e m O J v) R U -O ''y+' N C d _ 'R CNOd 71) C O Y CICO O LOW LOSS RATE PER RCFC/2322 0.1000 0.6600 0.5000 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0014 0.2902 0.0194 0.0575 0.3685 1 AREA WEIGHTED AVERAGE co O r 6666 (00 N o D a Ill CC a 1.707 48.170 4.271 7.654 61.802 SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC 11 ADJUSTED INFILTRATION RATE (in/hr) Li] 1- O CO d O 0.28 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] c o 8.00 CO 0 0 O PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 N N O O RI NUMBER [Plate E-6.1] CO CO O N CO CO N N LAND USE PAVING/HARDSCAPE SF - LOW DENSITY SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] 0000 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm j N N 0 0 O O 7 7 V m- 442.06 442.09 442.12 442.17 442.22 442.30 442.44 442.90 442.95 442.97 U (0 C Ti '80 I8 0 O O O 0.32 0.47 0.65 0.87 1.15 1.55 2.33 4.70 5.00 5.08 F 0 0 3,181 8,299 14,063 20,470 28,169 37,803 0) CO N o n o N 0 0 101,572 204,531 217,678 221,456 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 1,560 1,562 1,563 1,564 1,566 1,568 o I"- I,- 0 o 1,583 1,606 00 0'— N O 1,560 1,562 1,563 1,564 1,566 1,568 .—o 1,- I,- LO0 1,583 1,606 O)0 00 f0 CO SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 224,709 224,876 225,063 225,272 225,522 225,836 226,233 226,809 227,911 231,260 CO N— CO N- 0 CO M M N N Basin Volume cu -ft 4,742 9,861 15,626 22,035 29,735 39,371 51,590 69,298 103,155 206,137 219,287 223,066 N E 5 Z C 0 Z 0 4,742 6,680 CO CV M CD r r 9,264 11,203 13,787 19,279 35,432 104,565 (0 n CO V o Flood Hydrograph Flow cfs 15.81 22.27 24.42 26.57 30.88 37.34 45.96 64.26 118.11 348.55 0 c0 O) Cn r V a) > C U W t g W 0.25 0.36 0.39 0.43 OO o c0 O O 0.74 1.03 1.90 5.59 0.79 0.29 Loss Rate in/hr Max 1 Low 0.53 0.62 CO CO 0 0 CO W 0 0 m O 0— 1.92 5.07 CO CO O O 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 Storm Rain in/hr 0.62 0.73 c00c0 1- r O O n'— COO) O O-- o — .1-. c00 CV 0)7 N o— c00 c0 O RCFC & WCD FIVDG011 Ctrl UAILIAML DRAINAGE AREA -ACRES 61.80 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.54 UNIT TIME -PERCENT OF LAG 141.4 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.37 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) CO ry 00(0 4.4 4.6 0 0 ui ui 6.4 8.1 13.1 34.5 n 0 6 y Time Minutes Hours 0.08 0.17 Li, co N M 0 0 0.42 0.50 co N- o 0 0 0 NMN 1� CO 0 0 O m 0 0 '00 "' N N M 35 40 45 50 55 60 Unit Time Period NM V 0) (0N 00 C C 5 G.O (0. W.(0 J C C } c1) 0 0 N 0 0 0 00) 0 U M 0 ,=°1•1- co N N N 0 O c0 ocoV,� Mcrl Cco NO 0)00 O M W u • M W N N 7 CO CO N W 2 7 J 0 F O Q O CC O Z J 0 LL W W W ~ Z W C7 C7 W CD LUDI D Z W W* Q 1-00 QLU LL O (0 » 0 h N Z W _ico a - Lu U K Q 0��OV�(WLL00Q LL F Z J W O O 0 Ya Q w w 00 IX <0wJJWL,WWO> PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm CJ co V C/) >! m 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.01 442.02 442.03 442.03 442.05 442.07 N N O 0 7 7 442.14 442.16 442.19 442.21 442.24 5 0 0 C To N 0 0 0 0 C C i 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O 0 0 0 0 O O 0 0 0 0 0.05 0.10 0.15 0.18 0.27 0.37 0.44 0.55 0.72 0.86 0) M 1- O) .— N O O N m j 0 0 0 U 0 m 0 194 387 0 0 194 I.-- o co 7 N 7 6,533 7,685 11,716 16,227 19,297 23,806 31,194 37,621 43,085 49,029 55,451 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft CO M O 0) 792 313 M 14 M O 14 ID O N 14 1,560 1,561 CO CO o CO (00 1,567 1,568 1,569 1,571 1,572 1,560 1,560 0 0 1,559 1,560 1,560 1,560 1,560 1,560 1,560 1,560 0 0 0 0 1,562 1,563 M(0D(O 0 N- N- SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 224,585 224,585 224,581 224,565 LO CO N 0 CO V V N N N N co 0 CO V V N N 224,618 224,578 N c0 CO V V N N 224,681 224,750 224,818 224,856 224,987 225,134 M W N M Nui N N 225,621 225,830 226,008 226,201 226,410 O C E V 0 0 936 936 792 313 co N M� 507 1,753 V O � O 793 1,753 3,867 5,981 8,094 9,246 _ 13,279 17,791 O r OD M O O N N O co r --m N 0) M CO _ 44,655 50,600 57,024 E C j 0 M N a'M 792 313 co M N)� co M M� co M M 793 1,753 3,674 3,674 mr ml- 0 r MCV mt mr Cr, O N(O 4,634 6,074 8,955 7,995 7,034 7,515 7,995 Flood Hydrograph Flow cfs T -T- M M 2.64 1.04 1.04 5.84 1.04 5.84 5.84 1.04 (COQ N 0 12.25 12.25 12.25 9.05 18.65 20.25 7N cliN- N 29.85 26.65 23.45 25.05 26.65 Effective Rain in/hr 0.05 0.05 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.20 0.20 0.20 0.15 0.30 0.32 0.25 0.32 CO a O O 0.38 0.40 0.43 Loss Rate in/hr Max 1 Low CO CO N N O O 7M N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 LO 0) CO CO O O CO CO 7 V O O 0.48 0.44 N- 0) (0 co 0 0 N0) (0 LO 0 0 NOD I. CO 0 0 CO LO OD CO CO CO 0 0 0 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 Storm Rain in/hr MM O O 0.28 0.39 0.39 0.46 0.39 0.46 7 M O O 0.41 0.46 0.56 0.56 0.56 0.51 00(0 O O (NO(00 O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 61.80 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.54 UNIT TIME -PERCENT OF LAG 141.4 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) M M ��-- (0 1.5 1.8 1.5 _ 1.8 1.8 1.5 (O W -- 2.2 2.2 2.2 2.0 c0 r NNNN(ioi V r co 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 N M O OO 0.42 0.50 0.58 0.67 0.75 0.83 ON) O ', O.- . N CO 1.42 1.50 1.58 1.67 r CO N 1.92 2.00 2.08 5 10 15 20 N COO 35 40 45 50 55 60 n CO ( 75 80 W 0) 0 O _ 105 110 _ 115 120 125 Unit Time Period N 01 ml 0 (D N CO 0) O , N, 7 15 16 N- CO 19 20 21 22 CI N N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm !\ Lu 442.29 442.36 442.40 442.50 442.62 442.76 442.84 442.85 442.85 442.85 442.84 2.09 2.64 3.25 3.96 4.42 4.44 67,152 82,690 141,764 172,644 193,738 193,888 192,717 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft LO 00 1,580 1,586 1,592 1,599 1,603 1,604 1,604 1,604 1,603 1,575 1,578 1,580 1,586 1,592 1,599 c, 0000 CO LCD CO LCD CO SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 226,791 227,296 227,567 228,354 CO CO CV CV 01 CO N 01 230,868 230,904 230,909 230,914 230,876 «§ + �! ® 68,727 84,269 92,605 116,783 10 CO _ 2G 194,081 195,192 195,342 195,491 194,320 )_ \ $ 13,276 17,116 %( ') amPSCi 28,158 32,479 21,437 2,714 1,753 1,753 432 Flood Hydrograph Flow cfs 44.25 57.05 33.05 85.86 93.86 108.26 Effective Rain in/hr 0.53 1.38 1.15 0.15 6 CiN040,0000 Loss Rate in/hr Max 1 Low 1.29 0.44 CD 0 COCD 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 Storm Rain in/hr 0.90 1.75 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 61.80 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.54 UNIT TIME -PERCENT OF LAG 141.4 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 5.9 2.0 Time Minutes Hours 2.50 2.58 2.67 2.75 LOCc, CON 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 COCO CO 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY CV \\T- <f)_CO CON C4 § 0 § Z )) mak\ �g¥0o 2_Jc )WCC w1_1 �`m )0(00 u_ 0 #zSWooc= <! /)kw))§§2§[§ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W COCO CO 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 I 442.00 Total In Basin cu -ft ac -ft O o O O 0 0 O o O O 0 0 O o O O 0 0 O o O O 0 0 O o O O 0 0 O o O O 0 0 O o O O 0 0 O o O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 O O O O O O O O O O O O O O O O O O O O O O O O Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 464 557 557 557 557 650 650 650 650 650 650 743 743 743 743 743 743 743 743 743 743 743 836 0 0 i PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J W m 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.01 442.01 442.02 442.02 _ 442.03 I 442.04 Total In Basin cu -ft ac -ft O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 06 O O 06 CO O OO . . 0 0 CO N O . . 0 0 CO CO N 0 0 0 0 O O O O O O O O O O O O O O O N O O N,- N OD O i O, M 0 N N. W I- 0) Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 743 836 836 836 836 836 836 836 929 929 929 929 929 1,022 1,022 1,022 542 1,161 1,560 1,560 1,560 1,560 O O O O N O O O O 1,560 1,560 1,560 1,560 O O O O 0 0 O O O O 0 O O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O O 0 O O O O O 0 O (.0 O 0 1,562 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C CO) .. N U Q N d N h O O O N N N N N N CO CO O O0 N N N N N N CO CO O N N N N N N CO CO O O N N N N O O CO CO O O N N N N O O CO CO O O N N N N O CO CO CO O O N N N N CO 00 CO CO O O N N N N CO CO I. 01 O O N N N N CO 0 N CO CO N N N N N. O V r CO CO N N N N N 0 N r n r N N N N n O M N CD0 N N N N Basin Volume cu -ft 743 836 836 836 836 836 836 836 N N Q7 0 N N a) 0, 929 1,022 C) p , V O 1,780 2,001 2,841 3,680 5,138 6,597 Q) <'? 2N C , U M fO 7 M r OOOOOOOO)O 0 0 M M 0 0 M M 0 0 M M C) m N N C) C) NCI 0) 03 C) N 0) 0 O) x - N N N 0 0 x - x N O 'Cr Ox - O O O O 1. r x -x - O O O O 7 a NN W O 0 0 MM O i5 M O CO N Ma Flood Hydrograph Flow cfs 2.48 2.79 0 0 N N 0 0 N N 0 0D N N 0 M M 0 0 M M 0 M M M M 1.81 3.87 5.93 5.93 8.00 8.00 0 0 Oi O6 0) 0 c4,f N U C cc C W 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 M 0 0 0 0 0ci 0 0 MciMci 0 0 0ci0 0 0 Oci) M 0 0 Loss Rate in/hr Max 1 Low co O NN . O O6 O O N N O6 O O N N O6 O O N N O6 O O N N O6 O O N N O6 O N COCOCOCOCO7 O6 O6 0.34 _ 0.37 C) C) O6 N N V O6 0.45 _ 0.45 O N. 7 0 . O M M 0 0 M M 0 0 M M 0 0 M M 0 0 M N- 0 0 M N- 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 Storm Rain in/hr 0.26 0.30 O O M M 0 0 O O M M 0 0 O O M M 0 0 CO CO M M 0 0 CO CO M M 0 0 0.33 0.36 CO 0 CO CO O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 61.80 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.54 UNIT TIME -PERCENT OF LAG 141.4 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% O) C -E.,, U W 7pU) CL 0 0 m 0 OC) 0 0 0C) 0 0 0C) 0 0 0C) 0 0 00000 T- T- T- T- T- T- T- T- NM T- T- ,t700001".0 T- T- T- T- T- T- T- Time Minutes Hours 2.08 2.17 N CO N N 2.42 2.50 2.58 2.67 r CO N N 2.92 3.00 3.08 3.17 N CO M M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 O 0 N CO x-.- O 0 co mr O 0 c 0 .- O 0 0 0 x-.- O 0 CO N. x-.- O 0 r CO x-.- O 0 CO m x-.- O 0 C) 0 N O 0 0 N N O 0 N N N O 0 N CO N N O 0 co V N N O 0 7 O N N Unit Time Period N N N CO 29 30 31 32 CO M 35 36 M CO 39_ 40 41 42 CO V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J wCO CO m 442.06 442.07 442.09 442.11 442.14 442.16 442.19 442.22 442.25 442.28 442.33 442.39 con N V 442.63 442.74 442.76 442.75 N LO r N N et 7 442.74 442.73 Total In Basin cu -ft ac -ft O O MM 0 0 O O O CO 0 0 N O 1` CO 0 0,-,-,-,-,- O O O. -M CO 71`0 CO O N V CO N N CO CO N CO CO M f D 7 O)0) M M N 0) a) OD M co C O CO CO OD co co Tm m cqf O OO 05�(O m N O NN 0 M O CO N mm O 0 O O OO) m0) 770 O N N O 0)O 07 CO N 0) N..- 10 0) N- 00 L ,''• e, 7N CDN N O Z. O) NO) <QD W O 0 7 v.. CO_ N 1,...:N- 7 0 0 r 07 00100 f-0 O 7 Tm r OCD Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 1,563 1,564 1,565 1,566 1,567 1,568 0 N- N- 0 0 CO 7 N- N- 0 0 h 0 N- CO 0 0 1,583 1,587 1,592 1,598 _ 1,599 1,599 1,598 1,598 1,598 1,597 CO 7 O O 00000 O O O (D O O n CO O O O N- N- O O co 7 N- N- O O n O r CO O O co N. CO CO O O N CO 0)00)0) 0 O 0) 0) O O CO CO CD 0) O O CO N- CD 0) O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf CO CO O(- 0 In N N 225,309 225,457 225,625 225,813 226,021 226,230 226,458 226,706 IOO O LID O O r r N N O W O O 0 0 N N 229,257 230,109 230,215 _ 230,190 230,157 _ 230,120 230,077 230,031 Basin Volume cu -ft CO O 0 m mi0 .-,- 23,167 27,717 CO Nuo . CO (O N0 mm _ 45,076 51,478 0 0) ) m 7 ,- 0f0 O6 76,868 90,694 106,374 123,908 _ 144,534 170,728 174,006 173,244 172,202 171,068 169,749 168,337 N . C 3 j O W a.- 700001 r M 6 O^) R. r ILO N W Oi O N M 7 Ni6 O r CO 6 M tD N CO NiN co M 700 If .0 7 r.0 N Flood Hydrograph Flow cfs N COM -NN CO CO7 COO NN 26.57 _ 26.57 28.64 30.70 41.02 51.34 CLf)O r fM ICO 74.04 92.62 16.25 2.79 CO O 0 O CO N LOO 02 0 0( U) C U'5 L m Q' E W c00 NN 0 0 MM MM 0 O CO 0) MM O O MM 7777 0 0 CO 0) 0 0 CON coo 0 0 NN LO 0--- 00 Tm7 CO .1. N00000 0 0 MN 0 0 0 0 Loss Rate in/hr Max 1 Low Lf) 4O') O O 0.59 0.59 c00 cO0 0 0 c00 c00 0 0 On CO 0 0.- 0.87 1.01 O— W 1.32 1.58 N O O 0.17 _ 0.14 0.08 0.06 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M N- 0 0 N- N- 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 N- M 0 0 Storm Rain in/hr CO 0 O O 0 0 O O.- 0.73 0.76 0.79 0.79 0.83 0.86 CO N M 1.56 1.85 CO CO M O O 0.20 0.17 (- O O O RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 61.80 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.54 UNIT TIME -PERCENT OF LAG 141.4 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) CT OIN N N N 2.2 2.3 77 N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 CT? a) ,- O 0.6 0.5 MN O O Time Minutes Hours LO CO N CO 7 V N 0 7 O 7 V 0 N- O 0 7 V O CO r 0 7 V N 0 0) O 7 LO CO N. O(- If) LO LO CO N CO If) LO N 0 7 O If) LO CO N- O 0 In 10 LO CO r CO In 10 N 0 CO 0 In 6 IO 0 O 0 N N IO 0 CO r N N IO 0 r 0 N N 0 0 0 0 N N O 0 CO O N CO O 0 O CO CO IO 0 N CO CO IO 0 N CO CO CO LO 0 co 7 CO CO LO 0 7 O CO CO LO 0 O 0 CO CO Unit Time Period O N IL 53 54 55 56 57 58 0 O CD N O CD 63 64 0 0 c0 CO 67 _ 68 c00 N- n r EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C U C U tit U t U U S M N N) CON OO c0 C00 cN0 N CO N CO . f0 CO 0 7C4 N O COCON M O N M N 7 L L N r LUF- 2! Z O W W W w (.7 (7 wig J7 Zwwp H,00 W OO)�37cn� •Z <J�jOOWWWpmw < 0 1— CC 5 U) Ir_ J c7 <z_01100= U —Ii00 <i -w O O JJW�0<Mw.icj 2 — PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C N W CO 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 I 442.00 442.00 Total In Basin cu -ft ac -ft 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 0 O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 297 445 445 594 445 445 445 594 594 594 742 742 742 742 742 890 O O O T- 1,039 1,187 O T- 1,187 1,187 1,336 1,336 1,484 1,484 co (D. co T- T- 1,781 1,929 2,226 2,226 M LOO N N 2,820 2,968 3,116 3,265 N N C N N N- CO Cr, N. r 0 0 V V 0 Cr, r r 0 0 7 V 0 Cr, r r 0 0 7 V 0 Cr, r N- 0 0 7 V 0 Cr, r N- 0 0 7 V 0 Cr, r N- 0 0 7 V 0 Cr, r N- 0 0 7 V 0 Cr, r N- 0 0 7 V 0 W r t` 0 0 7 V (3) W N t` 0 0 7 V (3) W N t` 0 0 7 V Q) 0) N t` 0 0 7 V Q) 0) N t` 0 0 7 V Q) 0) N t` 0 0 7 V Q) 0) N r 0 0 7 V 4,679 4,680 4,680 4,680 4,680 4,680 4,680 4,680 4,680 4,680 O O O CO CO CO O O O 7 7 7 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.18 C 0.00341 Low Loss Rate (percent) 85.00% 224,565 224,569 224,569 224,574 224,569 224,569 224,569 224,574 224,574 224,574 224,579 224,579 224,579 224,579 224,579 224,584 224,584 224,589 224,589 224,594 224,584 224,589 00)) 00)) N N N N N 00) 00) N N N N 224,603 224,603 224,603 224,608 224,613 224,618 224,627 224,627 224,632 224,637 V 0 N N N 224,656 224,661 224,627 224,627 224,652 Basin Volume cu -ft 297 445 445 594 445 445 445 594 594 594 742 742 742 742 742 890 O O O S 1,039 1,187 O S 1,187 1,187 1,336 1,336 1,484 1,484 CO (D. CO N S 1,781 1,929 2,226 2,226 M LOO N N 2,820 2,968 3,116 3,265 N N CD N N N Volume In cu -ft 297 445 445 594 445 445 445 594 594 594 742 742 742 742 742 890 O O 1,039 1,187 O CO N— 1,187 1,187 1,336 1,336 1,484 1,484 CO CMD ,— N—,— OD CV N— 2,226 2,226 2,374 2,523 2,820 2,968 3,116 3,265 N N Q) N N N- Flood Hydrograph Flow cfs 0.33 0.49 M CO Cr CO 0 0 Cr, Cr) 7 7 0 0 0) CO V 0 0 0 CO CO 0 0 0 0 N N 0 co 0 0 N N 0 co 0 0 0.82 0.99 0) LO 0) N—,— O T -T- LO N CO T- 0) LO 0) N— O T- N N CO CO T- T- CO CO V 7 T- T- LO LO 0 CO T- T- l0 0 CO T- 1.98 2.14 2.47 2.47 2.64 2.80 CO 0 N— CO M M CO CO 7 CO M M I. N- 0 7 7 CO (Ni N M 4) CM 15 .c%1 a) K .0 W 0 ;E:7, O O Z:.; 0 O O Z:.; 0 O O 0 0 O O Z:.; 0 O O Z:.; 0 O O Z:.; 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 M 0 0 0 0 M M 0 0 0 0 M co 0 0 0 0 0.04 0.04 0.04 0.04 0.05 0.05 0 CO O co, O O 7 7 LO O co, O O O O Loss Rate in/hr Max I Low O N CO O O O 0.045 0.060 0.045 0.045 0.045 0.060 0 0 O O O O 0.075 0.075 0.075 0.075 LO O O O 0 0 O u) O 0 0 0 0 O O N 0 0 0.090 0.105 O 0 N N O O 0.135 0.135 O O 0 LO 0 0 O LO 0 0 0 0 O LO co 0) 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 LO u0, O N N O CO O O O co LO V 0 0 . O O 0.636 0.628 0.621 0.613 0 0 O O O N O O V 0) CO LO N O O 0.577 0.570 CO 0 O N LO N O O 0.549 0.542 LO CO CO N LO LO O O 0.522 0.515 0.508 0.502 0.495 0.489 0.482 0.476 0.469 0.463 0.457 0.450 0.444 0.438 N 0 CO N V V O O 0.420 0.414 0.408 0.402 I� O) 0) M M O O 0 0, ,I- CO CO I- M M M O O O Storm Rain in/hr L() co CO N O O O O 0.053 0.071 co co LO N O O O O 0.053 0.071 I. n O O O O 0.088 0.088 0.088 0.088 CO CO CO O O O O 0.106 0.123 CO N V O O 0.106 0.123 V V O O 0) 0, LO N O O 0 0 I. n O O 0 V r OT- T- O O N O N N N O O LO u0, 0 0 N N O O 0.282 0.300 0.335 0.353 0.370 0.388 LO LO CO 0 0 in N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 61.80 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.54 UNIT TIME -PERCENT OF LAG 424% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 LO CO O O 0 I— O O 0.7 0.8 0 I- O O 0.8 0.8 O) O 0 0 O O T- T- O T- C- 1.2 1.3 l0, N ,. N. 0 I %. S. co. O %. N T- N N N l0, Ln ,. S. N OO.— 2 0.25 0.50 l0, O Ns, O 1.25 1.50 1.75 2.00 2.25 2.50 0 0, r 0, N M 3.25 3.50 0 0, r 0, M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 0 0, r 0, 0 I— 7.25 7.50 0 0 r O x 0 0 0 N LO 0 0 8.75 9.00 9.25 9.50 LO 1 O 0) O N L0 O O Time Minutes 15 30 45 60 LO O O O 135 150 165 180 CO O N 225 240 255 270 285 300 LO O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 LO O,r 0 cco 0 Unit Time Period T- N M 'Cr LO CO I� CO CO C"- T- N T- M V T- 15 16 I. CO c- c- 19 20 N N N co V N N 25 26 27 28 29 30 N COMM CO 7 M 35 36 I,- CO CO M 39 40 N CO V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm CJ W Om fA `X 442.00 442.00 442.00 442.00 442.00 442.00 0 CO 0 N N 7 V 442.06 442.10 442.15 442.16 442.16 442.18 442.20 442.22 442.24 442.25 442.26 442.25 442.25 442.23 442.21 442.19 442.18 442.16 .- N- N N V V 442.11 442.09 442.07 442.05 CO 0 N N V V 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 Total In Basin cu -ft 1 ac -ft 0.00 0.00 0.00 0.00 O CV O O . O O Ns h O O O 0.30 0.55 0.80 0.82 0.84 0.95 1007 O � � N M � � (O CO M M � � O M N � S. N N O � S. 0.92 0.83 0.74 0.65 0.55 0.46 0.36 0.27 CO h - 0 O O 0.00 0.00 0.00 0.00 0.00 0.00 0 0 0 0 0 0 . O O O 0 0 0 0 0 858 N u) 00 0) CO N N. 13,045 23,921 35,064 35,593 36,389 41,401 45,681 50,214 54,006 57,056 59,359 57,946 56,770 52,647 48,526 44,260 39,997 36,033 32,072 28,113 24,009 19,908 15,809 11,565 7,176 2,938 0 0 0 0 0 0 0 0 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 2,968 2,820 2,820 2,523 2,671 4,682 4,683 4,686 4,690 4,698 4,705 4,706 4,706 4,709 N 1O 7 7 4,718 4,720 4,722 4,721 4,720 4,717 4,714 4,711 4,709 4,706 4,703 4,700 4,698 4,695 4,692 4,689 4,686 4,683 3,531 445 297 445 445 445 I- LO r CO V N COCV 4,680 4,680 4,680 4,680 4,680 4,682 4,683 4,686 CD 0m CO O O 4,705 4,706 4,706 4,709 4,712 4,715 4,718 4,720 4,722 4,721 4,720 4,717 4,714 4,711 4,709 4,706 4,703 4,700 4,698 4,695 4,692 4,689 4,686 4,683 4,681 4,679 4,678 4,679 4,679 4,679 0 COCO Ns CO O CO V 7 V SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.18 C 0.00341 Low Loss Rate (percent) 85.00% Percolation Area sf 224,652 224,647 224,647 224,637 224,642 224,735 224,805 224,948 225,132 225,486 225,849 225,866 225,892 226,055 226,194 226,342 226,465 226,565 226,639 226,593 O ,- Lo lO N 1O V O O N N N N 226,287 226,148 226,009 225,880 225,751 225,622 225,489 225,355 225,222 225,084 224,941 224,803 224,670 224,569 224,565 224,569 224,569 224,569 224,565 224,569 224,565 N .NC 7 m ; v () 2,968 2,820 2,820 2,523 2,671 5,540 7,675 12,072 17,735 28,619 39,769 40,299 41,095 46,111 50,393 54,929 58,724 61,776 64,080 62,666 61,490 57,364 53,240 48,971 44,705 40,739 36,775 32,814 28,707 24,603 20,501 16,254 N co NLO 00 O ,- 3,531 445 297 445 445 445 On) V On) N V N Volume In cu -ft 2,968 2,820 2,820 2,523 2,671 5,540 6,817 9,080 10,350 15,574 15,848 5,235 5,502 9,722 8,992 9,248 O O n O h 7,025 3,308 3,544 594 594 445 445 742 742 742 594 594 594 445 297 445 594 445 297 445 445 445 N 7 N Flood Hydrograph Flow cfs 3.30 3.13 CO 0I- O M NN On 0,- OIC W00) O O 11.50 17.30 17.61 5.82 (O 6666 OO O N M� ch O W CO CO CO ri M 3.94 0.66 O0) CO 7 0O 0.49 0.82 N N CO CO 000000 OOO CO CO 0) CO 7 0.33 0.49 O0) CO 7 OO 0.33 0.49 0.49 0.49 M0 CO CO 7 CO 000 Effective Rain in/hr 0.05 0.05 0.05 0.04 O O O 6 6 NO N. 6 6 0.18 0.28 0.28 0.09 OI s N. 6 6 COCOM 6 6 0.15 0.14 O , 0 O O CO 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 O 6 V 0 CO O O O 1O V O CO O O 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 O O O O 0 0 O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 O 10 O CO 'Cr CO 0 0 0 O O O 0) CO O O CO CO O O 0.358 0.353 0.347 0.342 0.337 0.332 0.327 0.322 0.317 0.312 0.308 0.303 0.298 0.294 0.289 0.285 0.280 0.276 0.272 0.268 0.264 0.260 0.256 0.252 0.248 0.244 0.241 0.237 0.234 0.230 0.227 0.224 O N N N O O LO N N N O O 0.209 0.207 N 0) O O 0) N N 0 0 0 Storm Rain in/hr CO (0 0 CO CO O O 0.335 0.300 _ 0.318 0.441 0.459 0.494 N 0 O O O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 0 N- CO 0 O O n 110 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 r— 110 0 0 O O 0.035 0.053 0.053 0.053 0 110 0 O 0 O O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 61.80 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.54 UNIT TIME -PERCENT OF LAG 424% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 0) N- N co 1O N N O co N N 2.9 3.4 V co C] N co N. N N 2.6 2.6 O N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 N CO N O O O 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O O O N 4 7 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O O O N O O 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O O O O N (0 N N N Time Minutes (00 n CO O 690 705 720 735 750 765 780 795 810 825 840 855 870 885 OO 0) 0)d) 930 945 (00 n0) CO O d) O 1020 1035 1050 1065 W 0O) O O 1110 1125 1140 1155 1170 1185 1200 1215 (0 CV CV (O0 n 0O) CV CV CV Unit Time Period 44 45 46 47 48 49 50 51 N 0 10 10 V u7 (0 10 56 57 O0) 10 LO O �N O O CO O O 64 65 OIs O O CO 0) O O LL OL N M Is r 74 75 O Ns Ns n CO 0) Ns Ns O� CO 00 82 83 V LO OD CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm 0 J CO c0W CO 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 Total In Basin cu -ft ac -ft 0.00 0.00 0.00 0.00 0.00 0.00 O O 0.00 0.00 O O O O 0 0 0 0 0 0 0 0 0 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 445 297 445 297 297 297 297 297 297 297 4,679 4,678 4,679 4,678 4,678 4,678 4,678 4,678 4,678 4,678 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.18 C 0.00341 Low Loss Rate (percent) 85.00% Percolation Area sf 224,569 224,565 224,569 224,565 224,565 224,565 O O O O O O O O O O O O V V V V N N N N N N N N C N 445 297 445 297 297 297 N 70) m 15U a W N N 0) W N N Volume In cu -ft 445 297 445 297 297 297 r- N- 297 297 C) CO N (NI Flood Hydrograph Flow cfs M 0.49 0.33 M M M M M M O O 0 0 0 0 0 0 Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low 0.045 0.030 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0)) 60) 0.193 0.191 m W W W 0.185 0.184 O O O O O O Storm Rain in/hr M O 0 co 0.053 0.035 0.035 0.035 0.035 0.035 O O co co O O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 61.80 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.54 UNIT TIME -PERCENT OF LAG 424% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) co N CO N N N N N N N 0 0 0 0 0 0 0 0 0 0 o2 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 CO 00) CV 0) 0)) 93 94 0) 00) 0 >- C 5 5 5 5 C ce C U U C V U V V V U Q W N m O N_ U O O M M 2 M W co VO V M M N (O 7 m V W cl O O O. O V m U) m n N O N,— W 2 7 J 0 > w D Q O O z 06 0 W W U7 CO gZW Q J jZ WWggWCOHO UOO cc j)W O co » Z W > Z>gJJyrOiiO=WwW(nwLI JOQWa H J U LU • .5‹ J u 8 8 6 6 Q F W U.F-2' O W LLLL d' OC MdO W Q BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: BASIN E BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 442 0 0 224,555 0 0 0.00 443 1 1 7,425 231,980 228,257 228,257 5.24 444 1 2 7,480 239,460 235,710 463,968 10.65 445 1 3 7,540 247,000 243,220 707,188 16.23 446 1 4 7,595 254,595 250,788 957,976 21.99 447 1 5 7,655 262,250 258,413 1,216,389 27.92 WHERE: V= l(E�—E2)(Ai+A2 +.lAiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 BASIN G DA -G 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 4 B 9 B PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION ACRES 0.316 33.880 1.546 1,350 ft 675 ft 464.0 ft 455.0 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AMC II LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT D 56 0.51 1.00 D 56 0.51 0.30 D 56 0.51 0.10 AREA 450.0 ft 29,375 sf 451.0 ft 32,950 sf 452.0 ft 36,680 sf 453.0 ft 40,540 sf 454.0 ft 44,615 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 277,652 139,349 BASIN G [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -G [3] AREA - ACRES 1.09 35.742 [4] L -FEET 138,381 3.18 1350 [5] L -MILES 124,782 2.86 0.256 [6] La -FEET 129,934 2.98 1.13 675.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.128 [8] ELEVATION OF HEADWATER n/a 464 [9] ELEVATION OF CONCENTRATION POINT 10.03 455 [10] H -FEET 453.60 3.60 9 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 35.2 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 5.93 [13] L"LCA/S^0.5 0.006 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 2.2 0.07 [16] LAG TIME -MINUTES 4.0 [17] 100% OF LAG -MINUTES 4.0 [18] 200% OF LAG -MINUTES 8.0 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 186,831 48,450 277,652 139,349 358,093 217,068 572,171 447,389 EFFECTIVE RAIN (in) 1.07 1.07 1.09 0.96 FLOOD VOLUME (cu -ft) (acre -ft) 138,381 3.18 138,303 3.17 141,025 3.24 124,782 2.86 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 135,473 3.11 1.09 129,934 2.98 1.13 125,173 2.87 1.18 79,376 1.82 1.85 STORAGE PROVIDED (cu -ft) (acre -ft) 147,099 3.38 PEAK FLOW (cfs) n/a 62.43 53.39 10.03 MAXIMUM WSEL (ft) DEPTH (ft) 453.73 3.73 453.60 3.60 453.48 3.48 452.35 2.35 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 1 1 LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 2.0 2.1 2.2 2.0 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0009 0.6256 0.0355 0.6620 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00346 (24-(T/60))^1.55 + 0.19 in/hr Undeveloped Condition: Low Loss = 90% II L H H � o o J J IIJ C H ° J m G J y R U 0 y • "E 0-U100' C G al > • G CO LL 0 LOW LOSS RATE PER RCFC/2322 0.1000 0.6600 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0005 0.3529 0.0201 0.3734 1 AREA WEIGHTED AVERAGE 0.009 0.948 0.043 (1) a w CC a 0.316 33.880 1.546 35.742 SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) Li] 1 0 M d O 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] c o0 cO O O PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 N O RI NUMBER [Plate E-6.1] CO (0 L N 56 LAND USE PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] 0] CO CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W 03 0m 450.08 450.20 450.32 450.46 450.63 450.82 451.06 451.38 451.96 453.47 453.66 453.73 co c CD 0 N- n 0 0 0.23 0.33 0.45 0.59 Io 0 .- 1.48 2.86 3.05 3.11 m F 03 C 00 2,482 6,083 a O O 0 CO O V 19,479 25,679 33,368 44,225 64,409 124,533 132,713 135,473 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 206 209 N CO N N 0 0 N N N N N- 0 CO M N N 254 295 300 302 206 209 212 216 220 225 231 239 V O O 0 N N 300 302 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 29,684 30,097 30,553 31,052 0 CO CO a 0. M N- N. N CO CO 33,213 34,378 36,543 42,483 O N- c0 CO N (0 M 7 a Basin Volume cu -ft 2,688 6,292 (O0 O N- N 0 O aM N_ 19,699 25,904 O V 0 CO O a a co Ni - 64,663 124,828 133,013 135,775 a) N E 5o 2 C 0 13 0 2,688 3,809 4,183 4,557 5,304 6,425 0 O O r 20,437 60,419 8,480 3,062 Flood Hydrograph Flow cfs m r0 a0 CV m W C6 6 17.68 21.42 26.40 36.99 68.12 201.40 N N 0 N ,- U) C U 5 t 5 W 0.25 0.35 O N CO R O O 0.49 0.59 CO CO IN- O O 1.89 5.59 0.78 0.28 Loss Rate in/hr Max 1 Low 0.53 0.62 CO 0 0 CO 0 0 m 0— 1.92 5.07 COCOCO CO O O 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 Storm Rain in/hr 0.62 0.73 0 001'- I-- I� O O 000— O O-- 00 aN 000 070 N 6— O RCFC & WCD FIVDG011 Ctrl UAILIAML DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.37 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) CO N M.4 4.4 4.6 O 0 u) O 6.4 8.1 13.1 34.5 r O OM Time Minutes Hours 0.08 0.17 (0 co N CO 0 0 0.42 0.50 co 1-- LO 0 0 0 NMN I� CO 0 0 O Cn O 0 N 0 0) N N M 35 40 45 50 55 60 Unit Time Period 1-0101 V l0 0 11-.000°‘-N C C c5,5 755 0n5 C U U >-U V ^O W U M 0 C0 p U O • M N . O r . O r Q O a M co V a p 0 W V M I N N O In co W 2 J 0 0 r D Q O O J 0 LL W W W Z C9 0 W Z W W* Q 17 0 0 LU QLL (tLt E (r) � Z W U Lu Q O>O�O�KKw0 000 LL F Z J („17 W00== YCI a Q M U. 00 IX <ow.joWCC Mwa O¢ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W 03 COm 450.01 450.02 450.03 450.03 450.02 450.05 450.05 450.07 450.09 450.09 450.10 450.12 450.18 450.24 450.30 450.34 450.44 450.54 450.62 450.72 450.88 451.02 451.13 451.24 451.37 5 U 0 C C N 0.01 0.02 0.02 0.02 0.02 0.04 0.03 0.05 n n O O O O 0.07 0.09 0.13 0.17 0.22 0.25 0.31 0.39 0.44 0.52 0.63 0.73 0.82 0.91 1.01 Om N U 337 674 927 849 772 1,527 70 N (V 2,957 2,877 �N O 00 M (") 5,691 7,552 9,411 10,713 13,680 16,921 CO M O O N 27,464 31,804 35,586 39,643 43,974 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 204 205 205 205 205 205 205 206 207 206 207 207 209 210 212 213 (0 CO N N O N N N N N 226 229 232 235 239 204 205 205 205 205 205 205 206 207 206 207 207 209 210 N M N N 215 218 220 222 226 229 232 235 239 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 29,437 29,476 29,505 29,496 29,487 29,574 29,565 29,651 29,738 29,729 29,752 29,838 0 COO O N OO co co 30,479 30,629 � V 0)(0(00)(00(0(0 O� (0(0(0(0(0(0(0(0(0 O 0) (MO V N(+) N W M(+) 0 ‘,"11 J m; U 541 878 CO Lc .— O .— .— ...1*-- M r--- .— 1,654 2,409 3,163 3,084 3,282 4,036 5,900 7,762 9,622 10,926 13,895 17,139 19,547 22,787 o co O O N M 35,818 39,878 44,212 0) E t O U > (� L 458 127 1.01�000- ,- O,- (ID O QD , 0) 405 960 2,071 2,071 2,071 1,516 3,181 3,459 2,626 3,459 5,125 4,570 4,014 4,292 4,570 Flood Hydrograph Flow cfs 1.80 1.80 CO N (0 V O N O 7 N O M N O 7 N O M O N N V M O (0 O M N M O O 0) 6 6 O 6.90 5.05 10.60 11.53 8.75 11.53 CO CO O N N N N CO N. CO CO CO N oi N N N. Effective Rain in/hr 0.05 0.05 7 0 0 O O 0) 0 0 O O O) 0 0 O O W 0 0 0 O O 7 0) 0 0 O O W 0) O O W O O 0.29 0.32 0.24 0.32 0.47 0.42 0.37 0.40 0.42 Loss Rate in/hr Max 1 Low co CO N N . O O 7M N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 (00) CO CO O O CO CO 7 V O O 0.48 0.44 I- 0) (O LL) 0 0 N0) (O LL) 0 0 NN I� O 0 0 CO 1000 CO CO CO 0 0 0 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 Storm Rain in/hr M M O O 0.28 0.39 0.39 0.46 0.39 0.46 0 M O O 0.41 0.46 0.56 0.56 0.56 0.51 CO CO O O CONCO O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) M M I T- 7 (0 I- T- 1.5 1.8 1.5 _ 1.8 1.8 1.5 (O co. I- T- 2.2 2.2 2.2 2.0 CO N. N N V r N N M,— M M 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 N M O O 0.42 0.50 0.58 0.67 0.75 0.83 DN) O O CO 7 ", N CO 1.42 1.50 1.58 1.67 0- CO N 1.92 2.00 2.08 5 10 15 20 N M 35 40 45 50 55 60 COC0- 75 80 W 0 O C O. _ 105 110 _ 115 120 125 Unit Time Period N 01 (O (D N. CO 0) O , N, 7 15 16 N. CO 19 20 21 22 01 N N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm �\ ° 451.58 451.86 452.01 452.39 452.80 453.25 $$ 453.58 453.60 453.60 1.52 1.86 2.22 2.65 2.92 2.95 2.97 2.98 2.98 15 2 tCO 51,354 60,948 _ 66,373 80,950 96,905 115,346 CO CA CV 129,273 129,934 129,886 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft mr LO CV CV 255 265 276 289 297 298 298 299 299 244 251 255 265 276 289 297 298 298 299 299 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 36,748 38,207 42,757 42,873 42,937 43,000 42,996 � k ` 2> ®;2220)§§§ - - co 12 - - 129,571 130,233 130,184 §CO_ ; B 7,624 9,845 7oo y 16,231 18,730 }&0)„CV QD (JD Flood Hydrograph Flow cfs coCV 18.93 49.48 54.10 62.43 41.15 5.05 CV COcq Effective Rain in/hr 0.53 1.37 1.50 1.73 Loss Rate in/hr Max 1 Low 1.29 0.44 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 Storm Rain in/hr 0.90 1.75 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 5.9 2.0 Time Minutes Hours CV CV CV0 2.50 2.58 2.67 2.75 LOCO COCV 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 coCO CO 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 0\\�\\\\/co CV \\\ C6 LO m §§ § S co\ !g¥00 §§) )Ww 3 �`m z)0(j§kw()§q <L_WOOY<! /)0 ms))§§2§[§ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C W N m> 450.00 450.01 450.01 450.01 450.02 450.02 450.03 450.03 450.04 450.04 450.05 450.06 450.06 450.07 450.08 450.09 450.09 450.10 I N 0 0d 0 0 V 7 N 05 0d 0 0 V 7 IC V 0 0 0 V 7 Total In Basin cu -ft ac -ft O O 0000000000000000000000, OOOOOOOOOOOOOOOOOOOOO0 0 Ci 0 0 N 0 0 N N 0 0 CO CO 0 0 a 7 0 0 (D (O 0 0 CO CO 0 0 1- r 0 0 0O CO 0 0 O) O) 0 0 0 0 -,- 0 0 N V COO O O CO M ‘1. c0 I� MO O I� W O h.1 W O O NQ) N m O (O 00 O 1� 0) m O (5 O N N N h o O W 7 O N N CO I� ON 0T T- N(5 ON m I� (5 O o5 c5 O I` O) O t5 V 0) O 05 N O V V Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 204 204 204 204 205 205 205 205 205 205 205 206 206 206 206 206 206 207 207 207 207 207 _ 208 208 O O N N O O N N O O N N O O N N O O N N O CO N N CO O N N CO O N N CO O N N O O N N O O N N O O N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 29,406 29,419 CO CO CO ,l - ,f aO O N N 29,460 29,480 29,499 29,519 29,539 29,558 29,578 29,604 29,629 29,655 29,681 29,706 29,732 _ 29,758 29,783 _ 29,809 29,834 _ 29,860 29,885 f 29,917 Basin Volume cu -ft 269 387 505 623 740 912 1,083 1,254 111 (0 CV 70 -� h,.- rQ) -� 2,215 _ 2,439 2,663 2,887 005 ,.' 0505050) (DO) 4,002 4,224 105 r V V N E 5 . C 3 O U > O) N ON N CO N N NN CO CO N co Nr CO CO O co I.- r CO CO O co I.- r CO CO O O I.- 050)05 CO V O O 7 V O O CO050505050505050) 7 V O O 7 V O O 7 V O O 7 V O CO (O 7 V Flood Hydrograph Flow cfs O o- 0T O 1.07 1.07 1.07 1.25 O O N N O O N N O CO N V CO CO 7 V CO CO 7 V CO CO 7 V CO CO 7 V CO CO 7 V CO 7 (O N C .C.5.5 LOOOOOOOOOOOOOOOOOOOOOOOO e' Q' C W N CO 0 0 CO CO 0 0 CO CO 0 0 CO CO 0 0 CO CO 0 0 CO 7 0 0 7 7 0 0 7 7 0 0 7 a 0 0 7 a 0 0 7 a 0 0 7 a 0 0 Loss Rate in/hr Max 1 Low 0- O O n 0- N. O O n O N O O O O N N O O O O N N O O O COCOCOCOCOCOCOCOCOCOCOCOO N N O O N N O O N N O O N N O O N N O O N N O O N N O O M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 Storm Rain in/hr N O O 0.20 0.20 0.20 0.23 CO CO O O CO CO O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% O C C (n :) U W W a a m E O (O 0j O (O (O 0j O (O 1, 0j O n 0, 0j O n 0, 0j O n W 0j O CO (0 0j O CO (0 0j 0 CO (0 0 0 CO (0 0 0 CO (0 0 0 CO O) 0 Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 N O O) O O .- 1.08 1.17 O CO N co. - ,_ 1.42 1.50 1.58 1.67 1.75 1.83 2.00 O O O O N O O NO O O coM V O O 7 O O O O co(O O O co(O 1- O O r O O O W O7 CD O C 0 0) 0) CD Unit Time Period T- N CO V 0 (D I"- CO CD F N 13 14 15 16 17 18 0) N I. NNN N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm V,u j N CO> ( m> 450.15 450.16 450.17 450.18 450.19 450.20 N N 00 V 7 450.22 450.23 450.25 450.26 450.27 450.28 450.29 450.30 450.30 450.32 M 00 V 7 00 V 7 450.49 450.53 _ 450.59 I 450.66 Total In Basin cu -ft ac -ft c- N_ Ci 0 N_ CO_ 0 0 CO_ fl O O (D (O O O (D I- O O CO CO O O O) CD N O 0 N N N O 0 N CO N N 0 O 7 (0 N N 0 O O) N CO 0 O NCO CO CO 0 0 N r 7 7 0 0 I' -IN (h n o 7 LD h N co co N(D (D (D (0 — (h.— W,- (D (O co O) co (n M0 (0 (O (0 0) CO O)(7 (0 (: O N. 7(00(. (00 h N (0 0) Nf0 W o5 (0 N N(7 O77N 0 O O co co co O O7 7"- (p7 6 `— M O (D(0 csi 6 N O x(07(0 6. 6 (h 0) W N Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O co - N N 208 209 209 209 209 209 210 210 210 211 211 211 N N N N N N N 213 213 7� D N N 216 217 221 208 208 208 209 209 209 209 209 210 210 210 211 N N 211 212 212 212 M M N N 214 215 216 217 MilEM 221 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C f0 (0 o d y U< y 0 M V. 71-- 010)000 0)0)0000000000000000000 N N (0 I-. OM 001(0001(0001.(0001(0010101001(0010(0 CO CO O) 0 (00 CO CO N CO _ CO CO 0) NNNCOMM777(0(0r CO CO CO 7 h CO CO ( () (DO CO CO coN CO CO CO 0- 7 CO CO N O) NO CO CO CO CO CO(O co 0)c- 0 CO CO CO (O CO0 c0 CO CO CO 0- LID CO CO Basin Volume cu -ft 4,945 5,220 5,495 5,770 6,045 6,320 6,594 6,868 7,196 7,523 0077 0,-(LOc0 R W Oo W 9,264 9,643 ' 0 O 6 10,861 11,624 (0Lr) VOM .-.—.— 0.00) -m0 W N cy 0) E 5 C > 0 O 0) moo 7 7 0) 0) tom 7 7 0) 0) tom 7 7 0) 0) tom01010101010101010101010101000 7 7 0- 0- (D (D C- 0- (D (D r- (D (D (D (D O N O N ((00 (O (O C- C- O) 0 7 7 co M N N coO(00 Lo 0 CO 0 a (V N Flood Hydrograph Flow cfs (h 7 (0 (D (0 (D 6 (D 6 0)000 I r r- r` 1.79 1.97 n C` 0) co. C- (D CO O (D LO N N 4.45 4.45 5.64 5.64 6.83 8.03 0) C U wi L M cc C W 77777777 OOOOOOOOOOOOOOOOOOOO.— 0O 0O 0O 0O LO 11) 0O LO 11) 0O LO 11) 0O LO 11) 00 N (0 O0 0) 0) O0 N0 O0 (0(00)N .—.—.—N O0 O0 Loss Rate in/hr Max 1 Low 0) in (0(0(0(0(0(0(001 N N . O O in in N N O O in in N N O O in N N O O W N N O O OO W N N O O W N C O O O C O 0 O O 0.34 _ 0.37 O D7 CO)07 O O N N 7 O O 0.45 _ 0.45 OD N. 7 LL) . O O (0)0 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M CO 0 0 M 0.- 0 0 M CO 0 0 M 0.- 0 0 M 0.- 0 0 M CO 0 0 Storm Rain in/hr 0.26 0.30 00000001010101 0)0101010101 0000000000 0.33 0.36 CO CO M M O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% ;En— E C (n O) U W fp0) 0 0 m a W O) 0 0 O O) 0 0 O O) 0 0 O O) 0 0.- O O T- O O T- T- O 7 T- T- 7 T- T- N co T- T- 7 7 T- T- co. co. T- T- co. 6 T- T- r, T Time Minutes Hours 2.08 2.17 N 0) N N 2.42 2.50 2.58 2.67 r OD N N 2.92 3.00 3.08 3.17 N 0) M 0) 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 (D O NM T- T- (D O C0 (D O c (O T- (D O (D(O T- T- (D O (Df-C•O000 T- T- (D O T- T- (D O T- T- (D O a, OO T- N (D O N N (D O N N N (D O NCM N N (D O M774) N N (D O N N Unit Time Period N N N N 29 30 31 32 0) 0) 35 36 0) 0) 39 40 41 42 V V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J w N /! CO 450.74 450.84 450.94 451.04 451.14 451.26 CO 7 7 451.64 451.79 451.98 452.21 CO CO N N 7 7 0 7 0) M 7 7 CO CO 0) CO 1- 7 453.48 453.48 _ 453.48 453.48 Total In Basin cu -ft ac -ft CM0(0O 0 0 CCo1 0 0 W 0 0 0.-.-.-.-.-.-.- 0v- NM NIN co, -V N W N N COCOC N N OCDOO N N COCOC N N 23,162 26,062 29,317 32,569 36,177 40,140 44,457 48,772 (00 00 40) 65,274 73,867 CO CO 0 M000) 0 0 C V °" 124,959 125,147 NN 125,012 124,825 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft M 0 N N N N CO O N CO N N M CD CO CO N N 0 N CO V N N 0 CD V V N N V O 0 c0 N N 0- 11) c0 C N N M V 00 0) N N If) if) 0) 0) N N 1!) if) 0) 0) N N 1!) if) 0) 0) N N M 0 N N O00 N CO CO CO CO CO O) N CO N CO 0) N N 1- 0 N CO CO N N M V N N 000000 N N N N N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 32,059 32,392 32,766 33,127 33,514 33,939 34,403 34,865 35,366 35,905 36,635 37,499 38,465 39,539 40,780 42,287 M N V 0 0 N N V V V T. V V 0 0 N N V V 0) T— N T- 0 0 N N V V Basin Volume cu -ft OOD W CO N N N 0) 111111000000 N. N m 36,409 40,375 44,696 49,014 COCV c O N. 1 CO N O 0 n 83,795 94,531 107,049 122,781 V NN 1N0 .-.- 125,469 125,442 00 O N .- y- e, EON 2 C 3 D CO V C N M N N 0cO V V M M 0) V o 0 M V 1- C OO OOON V V O CO I -OO V 6 CO V O CO R. CO CO N NO OO 6 ,_ CO lD W CG 'LiN 0 co c", 1 -CO V N0) N CO M N I- O0 Flood Hydrograph Flow cfs 9.22 10.41 0 (D T. I T 0 0 co O NT- 0) 0) T- N CO CO CO O T- T- V O D N N 33.09 36.67 42.64 53.39 N c0 Q) -- O 0) MOD 0 0 0 O) 0 .C.5 '5 L M Q' E W CO 0) 0 0 NN M 0 0 CO 0) MM 0 0 NN V V 0 0 LO 0) V V 0 0 ON co c00)0. 0 0 NN 0 .— 000 V T: T- CO V NOOOOO 0 0 MN 0 0 ,- 0 0 Loss Rate in/hr Max 1 Low YMO u0) O O 0.59 0.59 c00 COO 0 0 c00 C00 0 0 OC CO 0 0 0.87 1.01 O— CO .-.- 1.32 1.58 40 N O O 0.17 _ 0.14 0.08 0.06 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 Storm Rain in/hr CO 00 C00 O O O O O O 0.73 0.76 0.79 0.79 0.83 0.86 O T- N M 1.56 1.85 CM0 CO0 O O 0.20 0.17 O— O O O RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.37 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) CT O ,- N I— N N 2.2 2.3 V V N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 C 0 ,- 0 0.6 0.5 CO N 0 0 Time Minutes Hours O CO N CO vv N 0 1. 0 V vvvvvvuiuiuiuiuiuiuiuiuiuiuiui(0 CO f� 0 0 0 CO 0 OD N 0 Q) 0 CO N. 0,- O CO N CO N 0 V 0 CO N- O 0 O CO C CO N O O O 10 O O 0 N N 10 O CO N. N N 10 O C CO N N 0 o CO 0) N N O o Q) 0 N CO 0 O 0 CO CO 10 O N CO CO 10 0 N M CO CO 0 0 CO V CO CO 0 0 V O CO CO 0 0 0 0 CO CO Unit Time Period ON 53 54 55 56 57 58 (0CCDD O CND 63 64 CO0CO 67 _ 68 (000 -I -r EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C U U C U U U U U U E CSO co co 0,f co 03 0? M Ot 00 •N O 0 O CO N 0 1.0 N 1- 0 c0 u) N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C N W 6 0] 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.00 450.01 450.01 450.02 450.03 450.04 450.05 450.06 450.08 450.10 450.12 450.14 450.17 450.20 450.24 450.28 450.32 450.34 I 450.36 450.39 Total In Basin cu -ft ac -ft O O O O . O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O N N O O O O CO CO O O O O 0.04 0.06 I— 0) CD 0 0 0 O N . 0 0 0 LO (` 0 0 0 O CO N N 0 0 7 CO CO N N N . 0 0 0 O O O O 0 O 0 O O O O O O O O O 0 0 0 73 O O 73 146 304 462 705 948 O r °) tO 1,928 2,425 3,091 3,756 4,505 5,338 6,340 7,425 8,594 9,845 10,494 11,141 12,215 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft N N N 257 343 257 257 257 343 343 343 429 429 429 429 429 515 ,- 0 10 (D 601 614 588 601 614 614 614 615 c- (D O (D CO l` O (D O W O (D 621 622 624 626 N CO (D (D 634 637 M 0 CO O O CD 612 613 613 613 613 613 613 613 613 613 613 613 613 613 613 613 613 613 CO V CO (D 613 613 614 614 614 615 10 (D CO (D (fl L` CO (D a0 0) CO (D 621 622 624 626 N CO (D (D 634 637 M 0 CO V V O O (D SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.19 C 0.00346 Low Loss Rate (percent) 85.00% 29,395 29,405 29,405 29,414 29,405 29,405 29,405 29,414 29,414 29,414 N N ,r V 0) O N N N N 7 V 0) O N N N M 7 V 0) O N N 29,434 29,444 29,444 29,454 29,442 29,444 29,454 29,462 29,480 29,499 29,527 29,554 29,582 29,620 CD N CD I� 0) O N N O r - CO CO 0) 0) N N 29,964 30,060 30,175 30,300 30,434 30,578 30,653 30,727 30,851 Basin Volume cu -ft N, N N 257 343 257 257 257 343 343 343 429 429 429 429 429 515 = 0 u) (D 0 (0 CID O 588 601 687 760 QD 0 0 Q) r 1,320 1,563 1,806 2,134 V V U) O N M 3,712 4,379 5,130 5,964 6,969 8,057 N H CO N cr OO ) — N I� CO CO LO T- CO ,- ,- ,- Volume In cu -ft 172 257 257 343 257 257 257 343 M M 429 429 429 429 429 515 LO O t(D (0 (0 O 687 687 772 772 co co co N O O 1,287 1,287 1,373 1,459 (` COMt` 1,802 1,888 n (` n co co n Flood Hydrograph Flow cfs CT D) N O O 0.29 0.38 0.29 0.29 0.29 0.38 CO CO CO CO 0 0 CO CO V 7 0 0 CO CO V 7 0 0 0.48 0.57 0.57 0.67 r CO CD h O O 0.57 0.67 CD CO I— r O O 0.86 0.86 0.95 0.95 0.95 1.05 1.14 1.24 CO CO V V .-- ,- CO N Ln CO ,- ,- N. N. co CT ,- .-- O O 0 N N CO CO 7 7 (T (O C 15UCp 1 K .0 W 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 co M 0 0 0 0 co co 0 0 0 0 co co 0 0 0 0 0.04 0.04 0.04 0.04 0.05 0.05 (D CO O O O O 0 0 LO O O O O O O Loss Rate in/hr Max I Low O N CO O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O O O O O 0.075 0.075 0.075 0.075 LO O O 0) 0 0 O Lt) 0) O 0 0 LO O O N 0 0 0.090 0.105 O O N N O O 0.135 0.135 O O Ln (0 0 0 O Lt) Ln (D 0 0 O Lt) G0 D) 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 LO (0 O N N O CO O O O 0) N Ln N CO (D O O 0.644 0.637 0.629 0.622 0.614 0.607 0.599 0.592 LO CO O (` LO N O O 0.571 0.564 0.556 0.549 N (D V CO LO u) O O 0.529 0.522 0.515 0.508 N u) O 0) u) V O O 0.489 0.482 0.476 0.469 CO (D CO (0 V V O O 0.450 0.444 a0 N CO CO V 0 O O co O N N 0 V O O 0.414 0.408 N (D O O 010101010 O O (0 (7) O) CO I- O O O Storm Rain in/hr Ln co CO N O O O O 0.053 0.071 co co LO N O O O O 0.053 0.071 I— (` O O O O 0.088 0.088 0.088 0.088 co (D CO O O O O 0.106 0.123 co N V O O 0.106 0.123 V V O O O) 0) L() N O O CD (D r 0- O O CD V r 0) c- O O N 0) = N N N O O LO L0 CD (D N N O O 0.282 0.300 0.335 0.353 0.370 0.388 Ln LO CO CO (D (n N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 LO CO O O CO I— O O 0.7 0.8 CD 0- O O 0.8 0.8 0) O 0 0 O O T- T- O c- T- T- 1.2 1.3 Ln N ,. N. CO (` , , 0) O , N v- N N N Ln Ln ,. , N N 0 2 0.25 0.50 LI) O r..... O O= 1.25 1.50 1.75 2.00 2.25 2.50 Ln O r O N M 3.25 3.50 Ln O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 Ln O r O CD I— 7.25 7.50 Ln O r O r O Ln O N O O O 8.75 9.00 9.25 9.50 1n O r 0) O N LC O O Time Minutes 15 30 45 60 O O O 135 150 165 180 0) O N 225 240 255 270 285 300 = O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 Ln O 0 (0 (MD co Unit Time Period N co V Ln CO I` CO Cr, C"- T- N T- T- 0) V T- T- 15 16 0- O T- T- 19 20 N N N CO V N N 25 26 27 28 29 30 N CO CO CO 7 CO 0) 35 36 I,- o0 CO CO 39 40 N M V 7 V N E N O w UJ7i 0 O ics O = 0) V 0 N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J W N 0) m `X 450.43 450.46 450.49 450.52 450.54 450.62 450.72 450.86 451.03 451.26 451.50 451.56 451.63 451.76 451.89 I 452.01 N N N LO LO V V 452.29 452.32 452.35 452.34 M M N N V V 452.30 452.29 452.28 452.27 452.26 452.25 452.23 452.22 452.21 _ 452.19 452.18 452.17 LO v- N N V V v- cJ N N V .1- 452.10 452.08 452.07 Total In Basin cu -ft 1 ac -ft o O M CO CO O6 0.35 0.37 0) V c(O O6 0.52 0.62 0.74 0.92 ,- CO .. 1.22 1.32 1.42 1.53 N ON N., ,_,_ 0 N.,. O , s, N N- CO OO s, 0 0) N., s, O h N.,. N., s, CO O7 N.-. N., s, MN N.. N., s, N- N.. N., s, 0 O N.. CO s, I� (OO OOOOOOO s N N- 0 0) I� LI) O S 1 13,286 14,269 15,250 16,057 16,947 19,342 22,469 26,897 32,049 40,206 48,506 50,665 52,975 57,717 62,030 66,482 70,502 74,088 77,238 78,239 79,376 78,926 78,477 77,944 77,412 77,052 76,693 76,335 75,891 75,449 75,008 74,482 73,871 73,347 72,910 72,388 71,782 71,263 70,744 70,227 69,625 69,111 68,511 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 645 648 650 652 654 660 CO CO CO O 690 708 727 732 737 747 757 767 775 783 W 0) n r 794 793 792 791 790 789 788 787 787 786 785 784 782 781 780 779 778 777 776 775 r r f` r r Ns 645 648 650 652 654 660 ((OOh.. CO O 690 708 727 732 737 747 757 767 775 783 W 0) (s r 794 793 792 791 790 789 788 787 787 786 785 784 782 781 780 779 778 777 776 775 r r f` r r r SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.19 C 0.00346 Low Loss Rate (percent) 85.00% Percolation Area sf 30,974 31,087 31,200 31,293 O c- 0) h Cl."). co co 32,031 32,540 33,121 33,997 34,889 35,121 35,369 35,878 N c M CO co co 37,213 37,573 37,889 37,989 38,103 38,058 38,013 37,959 37,906 37,870 37,834 37,798 37,754 37,709 37,665 37,612 37,551 37,499 37,455 37,403 37,342 37,290 O CO M CO N r r co CO 37,126 37,074 37,014 C C) 7 2 m; V (— 0) 0) -- 15,900 16,709 17,602 20,002 23,136 27,575 I 32,739 40,915 49,233 51,396 N O I� CO (� (1) i cd 62,787 I 67,249 71,278 74,871 78,028 79,030 0) 0) COxr W r- 79,269 78,735 78,202 77,841 77,481 77,122 76,678 76,235 75,792 75,265 74,653 74,128 O (OO ,- r r 72,560 72,040 71,520 71,002 70,399 69,883 69,282 Volume In cu -ft n CO I. O N. � 1,631 1,459 1,545 3,054 3,795 5,106 5,842 8,866 ON N 0) O CO Oi N 3,047 5,490 5,070 5,220 4,795 4,369 3,940 1,792 1,931 343 343 257 257 429 429 429 343 343 343 257 172 257 343 257 172 257 257 257 n N I` O N Ns Flood Hydrograph Flow cfs O) W . . 1.81 1.62 N 0) t\ CO . • CO 4.22 5.67 0) O V W O O 10.03 3.21 O O M M O 5.63 5.80 5.33 4.85 4.38 1.99 2.15 0.38 0.38 0.29 0.29 0.48 0.48 0.48 0.38 0.38 0.38 0.29 0) 0) N O O 0.38 0.29 0) 0) N O O 0.29 0.29 0) 01 0) N O O O Effective Rain in/hr 0.05 0.05 0.05 0.04 O 0) 0 0 O 6 N O O 6 0.18 0.27 0.28 0.09 0) Ns O O O CO CO O O 0.15 0.13 N O , 0 O O CO 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O 0 Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 O LCD V O M O O LCD V O M O O 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 ((00 ( CD 00 O O O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 COO 7 CUD OO O O O O O O 0.374 0.368 0.363 0.357 0.352 0.347 0.342 0.337 0.331 0.326 0.321 0.317 0.312 0.307 0.302 0.298 0.293 0.289 0.284 0.280 0.276 0.271 ((0 (MO N N O O 0.259 0.255 0.252 0.248 0 7 N N O O 0.237 0.234 0.230 0.227 N N N N O O 0.218 0.215 0.212 0.209 O O O N N N 0 0 0 Storm Rain in/hr 14) M CO CO O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 O CO O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 U) N- CO 0 O O N- (f) 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 N- (f) O O O O 0.035 0.053 0.053 0.053 M (f) M O O O O O O RCFC & WCD C,11ff IDGiCMOOfn1W DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 0) I- N. co O N N co co N N 2.9 3.4 V M M N C) I- N N 2.6 2.6 O N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 N CO N O O O 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O O O N - 7 N 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O O O N O O N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O O O O N O N N N Time Minutes COOn CO CO 690 705 720 735 750 765 780 795 810 825 840 855 870 885 OO 0) 0)O) 930 945 COOn� 0) 11) O) O 1020 1035 1050 1065 W 0O) O O 1110 1125 1140 1155 1170 1185 1200 1215 C.LO N N nCD N CV CV Unit Time Period 44 45 46 47 48 49 50 51 N M O O V O O O 56 57 CO 0) O O O W O 0 N M O 0 64 65 CO I- O 0 CO 0) CO O LL OL N M Is r 74 75 CO I- Ns n CO 0) Ns Ns CD CO 00 82 83 V O O CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm y --I CO 0 m� 452.05 452.04 452.02 452.01 451.99 451.98 451.96 451.94 c c vv Total In Basin cu -ft 1 ac -ft (0(00 CLOD 1.54 1.52 LO. 1.45 1.44 CO o 0 CO 65,703 65,110 64,519 63,929 63,341 62,754 0 O 01(0)') r r co O 0 0) CO O Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O 01 CO O 765 764 763 761 760 759 I's O I's N- O O n N- 765 764 CO y- 760 759 N- (O n N ((0 (O 0 I,- N- ((0 O r n SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.19 C 0.00346 Low Loss Rate (percent) 85.00% Percolation Area sf 36,963 36,903 36,852 36,792 36,732 36,673 36,609 36,546 36,482 36,419 N . C N E N 7 , 68,769 68,170 67,659 67,063 co O N- ,i- co 65,282 64,691 O co n m U ((00 ((00 (0 (0 Volume In cu -ft 257 172 I's N N N N N N N N N- N- N- N- N- N- v- Flood Hydrograph Flow cfs N 0) 0) 00) 01 0) 0) 01 0) 0) 0 0 0 0 0 0 0 0 0 0 Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low 0.045 0.030 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0 CO CD 7 0.192 0.191 O CO N- N- O O 01 N 0) CO 01(0(0(0 O O O O O O O O Storm Rain in/hr 0.053 0.035 0.053 0.035 0.035 0.035 0.035 0.035 O O CO CO O O RCFC & WCD C,11ff IDGiCMOOfn1W DRAINAGE AREA -ACRES 35.74 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) co N CO N N N N N N N 0 0 0 0 0 0 0 0 0 0 1,2 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 2 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 W 0) cv 01 00) 93 94 01 001 0 >- C 5 5 5 E Q C U U C (5 U U (F,j O V U E 01 � N � M �J ?r (my09 MNO DO M 7 i1 4O N,,-01 LO ,- NM Ci)I- co 7 W 2 7 J 0 > W O Q O O W W CS) 0 Z • W 00Q W�g Q J j Z W W Oo KO Ia O 0 ce Z O co» <j f j Z Wa = gJy>OOWW i i WOQW J [Cce(n J 0 LLCC • FZJuOOaCJ <OO F W W ▪ � 2' O W LL LL fi 0_ < BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: BASIN G BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 450 0 0 29,375 0 0 0.00 451 1 1 3,575 32,950 31,145 31,145 0.71 452 1 2 3,730 36,680 34,798 65,944 1.51 453 1 3 3,860 40,540 38,594 104,538 2.40 454 1 4 4,075 44,615 42,561 147,099 3.38 WHERE: V= l7Ei—E2 Ai+Az+AiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 BASIN H DA -H 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 1 B COMMERCIAL LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION ACRES 7.118 1,350 ft 675 ft 464.0 ft 455.0 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AMC II LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT D 56 0.51 0.90 AREA 448.0 ft 13,135 sf 449.0 ft 19,390 sf 450.0 ft 21,415 sf 451.0 ft 26,025 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 55,294 7,511 BASIN H [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -H [3] AREA - ACRES 2.18 7.118 [4] L -FEET 34,704 0.80 1350 [5] L -MILES 67,518 1.55 0.256 [6] La -FEET 43,319 0.99 1.39 675.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.128 [8] ELEVATION OF HEADWATER n/a 464 [9] ELEVATION OF CONCENTRATION POINT 3.71 455 [10] H -FEET 450.29 2.29 9 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 35.2 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 5.93 [13] L"LCA/S^0.5 0.006 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 1.6 0.07 [16] LAG TIME -MINUTES 4.0 [17] 100% OF LAG -MINUTES 4.0 [18] 200% OF LAG -MINUTES 8.0 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 37,207 2,504 55,294 7,511 71,314 14,935 113,948 46,429 EFFECTIVE RAIN (in) 1.34 1.85 2.18 2.61 FLOOD VOLUME (cu -ft) (acre -ft) 34,704 0.80 47,783 1.10 56,379 1.29 67,518 1.55 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 33,264 0.76 1.81 43,319 0.99 1.39 47,929 1.10 1.26 49,089 1.13 1.23 STORAGE PROVIDED (cu -ft) (acre -ft) 60,238 1.38 PEAK FLOW (cfs) n/a 14.42 12.62 3.71 MAXIMUM WSEL (ft) DEPTH (ft) 449.84 1.84 450.29 2.29 450.48 2.48 450.53 2.53 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 1 LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 1.0 1.3 1.6 2.1 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.1800 0 0 co d -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00090 (24-(T/60))^1.55 + 0.05 in/hr Undeveloped Condition: Low Loss = 90% II L O co o 3 o J J II J C H ° J m O J y R U 0 .d+ Si C ,_� R DU100' d C 0al > y Y G CO IL OO LOW LOSS RATE PER RCFC/2322 0 0 0 d LOW LOSS CONDITION DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) o o d (0 o d 1 AREA WEIGHTED AVERAGE oO 0 (1) a w CC a 7.118 7.118 SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 01'0 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 0 m PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 RI NUMBER [Plate E-6.1] co LAND USE COMMERCIAL RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] m PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C) j Cl)N0000000 CO O.- V V N M4. V. V V 448.64 448.81 449.07 449.68 449.79 449.84 5 m S= 0.02 0.05 0.08 0.12 0.15 0.19 0.24 0.30 0.40 0.69 ,f0 rn o 0 « m F a0 B U 1,037 2,293 N M O O (.j lj 6,561 8,322 10,375 13,054 con N O r- O co 32,205 33,264 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft m m 101 105 109 114 119 127 M c- 146 147 94 98 101 105 109 114 119 127 fD V M a 146 147 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 13,573 14,060 0 O n.- in. - 46' NV6 15,716 16,400 17,197 18,236 19,545 20,785 20,998 21,103 Basin Volume cu -ft M M N r M LLS 6,670 8,436 10,494 13,180 a r N .- m M a M m jN 5 C 0 0____ M� M N O V ID 1,652 1,875 2,173 2,805 pp O N (D ,,,RR 7 0 O N Flood Hydrograph Flow cfs 0 M4 4.76 5.01 N N N O N M N- 0) 15.55 42.09 7.61 4.02 N ,..= gyp --C..)001,- w 0 Sdcidd W M M O O 0.77 0.87 O O M 2.17 5.86 1.06 0.56 Loss Rate in/hr Max 1 Low 0.53 0.62 LOCOMN4M 00000- 1.92 5.07 000 O O 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 O_ O O O Storm Rain in/hr 0.62 0.73 (D W 1- rO OOOO'- O n, D). - O aN '-N O c0 D)7c0 LD' O c0 -O RCFC & WCD FIVDG011 Ctrl UAILIAML DRAINAGE AREA -ACRES 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.10 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) °.N (0(0 4.4 4.6 00 0)10 6.4 8.1 13.1 34.5 O 6c6 Time Minutes Hours 0.08 0.17 N M NM OO 0.42 0.50 O 1,. M0,000,0 OOOOO.- NMN O .,.-x-O N N M 35 40 45 50 55 60 Unit Time Period 1- N C) V lD (0 P O D) °'- N C C (0 C (00O(0 (0,5n ( C 0 } U 0 M 0 0 0 O 0 U m- — 0 0 0 0) 0) O O U Q 0 N N OI. N441481 22co• N M ) 0 .— M N 7 M N W J 0 0 r D Q O O J 0 LL W W W ~ Z U 0 W( DiD Z W W* Q 1-00 Lu • LLLL O L (0 0 0 g Z W U Q >>04)L<UQQJ LL F Z J W O O 0 Y Q M w0<0LL_ WL,(L'a0> PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm CJ W O CO CO 448.03 448.05 448.07 448.10 448_14 448.18 448_21 448.25 448_29 448.33 448_36 448.40 448_46 448.51 448_57 448.62 448.69 448.76 448.82 448.89 448.98 449.05 449.12 449.18 449.25 5 O (6 C (71 N 0.01 0.02 0.03 0.04 0.05 0.07 0.08 0.09 N O O 0.13 0.15 0.17 0.19 0.21 0.23 N CO N N O O 0.30 0.33 0.36 0.40 0.42 0.45 0.49 O m cg t U 418 834 1,139 1,664 2,187 2,875 3,395 4,079 N N- O (- N 7O 5,845 6,523 Cr' (7 7 M f` O 10 N 0) O)0) W Oco N `—� 13,243 14,397 CO 7 CO N .-.- 18,507 19,820 21,187 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft M 7 O O) 10 O co 0) 1 C, co 0) 101 102 104 106 I O Tm Tm Oco ..- Tm Tm O Tm Tm 121 124 127 130 134 135 136 137 138 CO 7 0,0)00)00) (O O h 0) 101 102 104 106 107 109 .- V CO O N N M 127 130 cr LO CO 136 137 138 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CO 0 CO a M M N CO O CO M M 14,019 14,286 14,488 14,753 CO CO O N (O(6 15,439 15,702 16,050 16,397 16,743 17,045 17,475 17,925 O LO CO I-- O O M,- co O 0 0 CO O O co r 0) O) O O) N coCO ; PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm !\ 449.34 449.46 449.54 449.71 449.89 450.08 450.20 450.23 450.26 450.29 450.28 0 0.53 0.59 WI, 0.79 0.88 0.95 0.97 MMM 23,161 25,576 27,160 30,567 /\ 41,320 42,061 42,690 43,319 43,284 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 140 141 142 145 147 151 155 156 157 158 158 142 145 147 151 155 156 157 158 158 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 20,099 20,339 20,496 20,835 21,200 21,808 22,373 22,517 22,640 22,762 22,756 «§ + �! ®g& Po ir- _ 27,303 30,712 34,395 38,573 41,475 42,217 42,848 43,477 43,442 )_ \fANS§§ $ °ww,-wwwCOe5 3,054 897 787 787 123 Flood Hydrograph Flow cfs 7.05 8.52 5.76 11.84 12.76 14.42 col coi col 6coos Effective Rain in/hr 0.80 1.65 1.78 2.01 1.42 0.42 r--r-coCNIM,DOOMM Loss Rate in/hr Max 1 Low 1.29 0.44 MMM00000000000CO Storm Rain in/hr 0.90 1.75 1.52 0.51 0.46 0.46 0.15 RCFC & WCD MV ODITa ECO 7 f�t1LlMNJG1E DRAINAGE AREA -ACRES 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.10 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 C4 5.9 2.0 CO Cq coco Time Minutes Hours 2.50 2.58 2.67 2.75 coCV 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 01co co 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY \��\\\\\\ \ § PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C U j N CO>1 CO 448.00 448.01 448.02 448.03 CO O W W V 7 448.06 448.07 448.08 448.10 448.11 448.12 448.14 448.16 448.17 448.19 N N ad W 7 7 448.24 448.25 448.27 448.29 448.30 I 448.32 Total In Basin cu -ft ac -ft OO 00000000000000000000,-,-,-,- Ci 0 0 0 N 0 0 N CO 0 0 CO ml- 0 0 a (0 0 0 (0 CO 0 0 CO n 0 0 CO CO O O 000. O O -,-CA O O O CD 56 184 311 437 563 760 957 1,153 1,348 1,543 1,738 2,003 2,267 2,531 2,794 3,056 3,317 3,578 3,838 _ 4,097 4,356 _ 4,614 CO N- CO OD ,- V O Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft N N 0) O N CO O O CO V O O V O O O (0 CO O O (O N- O O OD O O O O 0 O O 0 O O N CO O O CO 7 O O 0) 0) O O N N 0 0 N M 0 0 COV 0 0 V.4 0 0 00 CO 0 0 CO n 0 0 CO 00 0 0 0 0 0 0 0 0 0 N 0 0 0 0 0 0 0 (0 (0 0 0 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf CONV ,-N C6 C.5 CO V NCO 00 M 13,389 13,466 V,- (0 CO M M COOCO CO N.. M M V V COO M M 14,050 14,152 14,254 14,356 14,458 _ 14,559 14,660 _ 14,760 14,861 _ 14,961 15,061 f 15,188 Basin Volume cu -ft 148 276 403 530 656 854 1,051 1,248 1,443 1,639 1,834 2,100 2,365 2,629 2,892 3,155 3,418 3,679 3,940 4,200 4,459 4,718 4,976 5,304 0) EC 5 O U W 0 N 0 0 N N O N N N N N N N N M N N coOM N N coOM N N coO0)) N N CO CO N N CO CO N CO CO CO Flood Hydrograph Flow cfs O 00 7 n 0 0 CO 00 n n 0 0 C0 n n 0 0 0 n n 0 0 0 0 n n 0 0 0 0 n 0 N 0 .-- N N .- .- N N T- T- N N T- T- N N T- T- N N T- T- V N V T- T- M t C 15 g cC C W n 0 Ci O 0 0 Ci O 0 M Ci O M M Ci O n M Ci O n n Ci O n n Ci O n n Ci O n n Ci 6 n n Ci 6 n n Ci 6 n 0 Ci 6 Loss Rate in/hr Max 1 Low n 0 O O nn _ O O n O N O O O O N N O O O O N N O O O (n N N O O (h (n N N O O (h (n N N O O CO (n N N O O CO (n N N O O CO (n N N O O CO u0 N N O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr T- N O O 0.20 0.20 0.20 0.23 N CO O O N N O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.10 LOW LOSS RATE - PERCENT 85.00% O C C (n :) U (0 0) 0 a m 0 NO 00000000000000000 c0O con nn nn n 00 00 00 00 00 00 00 CD 00 00 OCD 00 00 OCD 00 0) 00 Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 N O O O O 1.08 1.17 (0 0) N co. 1.42 1.50 1.58 1.67 1.75 1.83 2.00 O O LO O T- N O N CO LO O COcO LO O 7 (0 LO O (0 co LO O co(O LO O n coLO LO O co 0 LO 00 0 co LO CD CD mm � CD Unit Time Period T- N CO V (0 CD n CO CD,_,_ N 13 14 15 16 17 18 0) N TI- NN N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm CJ y CO C J .7) m> 448.34 448.36 448.38 448.40 N V VV CO CO 4 4 CO CO •V V CO CO 4 7,, O CO N 0 CO CO 7 448.55 448.57 448.60 448.63 448.65 448.68 N 0 t` N.O c6 O 7 448.79 448.83 448.88 448.92 448.97 449.02 (O T- 0 7 7 Total In Basin cu -ft ac -ft M_ M_ 0 0 ,, (O 0 0 CO (0 0 0 r CO 0 0 O) CD N 0 0 O N N 0 0 N CO N N 0 0 a O N N 0 0 r CO N N 0 0 0) N M 0 0 CO 10 CO CO 0 0 (O CO CO CO 0 0 0 N V V 0 0 (N 00 V n (O(O 0 0, V (O(0 n 0-O (On CO O M n RN N 0 N (n OOO 0)n co N O) N (NO CV (O a; 6 CO N h M N O O`—`—c' r (O N I!) r f` CO V cs6 O r O M N O mir 'F (O M co co f` 0 66 O O V 7 M r'.5 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft CO O 108 109 O N M Mr (O (0 O 0) O N CO N 126 128 130 132 134 135 MEM 136 O O 108 109 O T- T- N M a CO CO CO O) 120 121 CO N N 126 128 M M M M 136 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C O f0 N_ d UQ N a f� V O N V NIn 0 O V CO N (O NIn r CD fm 0) Nl0000000 NCO V O 0 a0 O) O M V O NIS (O r CO NO O) O (Or N N h(O N V hr LOW NO CO CO f. r V O mrOOO V ON V r CO O) ON f-0 n V N V Oi O. n O NN N CO 0)O) Basin Volume cu -ft 5,561 5,888 6,214 6,539 6,864 7,187 7,510 7,832 10O N N (0 OOO)O) Off) O M 9,782 10,241 10,698 11,153 I. f-70 O7 N ,-,- 0 (0 ,-,- N 14,338 15,069 15,870 16,668 18,476 co E5 C UCO N CO CO CO V CO CO CO CO 7 V CO CO M CO 7 V CO CO M CO 7 V 7 V 0 0 (O LO 7 V 0 0 (O LO 7 CO 0 0- (O LO CO CO 0- 0- (O LO 0- CO 7 O r 0 0 O 0) 0- N. CO CO O O N N CO CO 0) O) p O O Flood Hydrograph Flow cfs V N V 7 V Cr. V 7 V Cr. V 7 V Cr. V OOOOON (O O (O O (O O7 N N O) O7 (O0) T -M 2.63 2.63 2.87 2.87 T- 0) (OO co 07 N 0 ()'5 €101010101010 mZ' .9 i0 W f- 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0) co 0 0 0) co 0 0 0) 1- 0 06 f- 1- 0 O M 0 0 f- - 0 0 0 0 0 0 co co 0 0 f- 0 0 0 Loss Rate in/hr Max 1 Low co CO NN . O O ((O CO N N O O ((O CO N N O O ((O CO N N O O a0 O N N O O a0 O N N O O O N COCOCOCOCO7 O O O O 0.34 _ 0.37 CO 0) O O N 01 V O O 0.45 _ 0.45 O 7 lO . O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr 0.26 0.30 00000010101010 (01010101010 0000000000 0.33 0.36 CO O CO co O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.10 LOW LOSS RATE - PERCENT 85.00% O) C C (n d U (0100000000010101010000 752 o_ a a m a 0 0 0 0 0 0 0 0 T- T- T- T- T- T- T- T- T- T- T- T- T- T- T- T- T- Time Minutes Hours 2.08 2.17 N co N N 2.42 2.50 2.58 2.67 r co N N 2.92 3.00 3.08 3.17 N CO M M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 O O NM IO O Mmr IO O c (O IO O OOOr IO O T- IO O r 000) IO O IO O OOO N IO O N N IO O N N N IO O NM N N IO O CO V N N IO O 740 N N Unit Time Period N N N co 29 30 31 32 M M 35 36 M co 39 40 41 42 co V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J .7,w (0 CO! '- N 0) Oi 4 4 449.27 449.32 449.38 449.45 449.51 449.58 449.65 449.72 449.81 449.92 450.03 450.15 450.27 450.43 V 7 OO LO LO Mr 4 450.48 450.48 N.- V 7 OO LO LO Mr 4 Total In Basin cu -ft ac -ft a V 0 0 (000) 0 O N( 0 O CO CO7 0 O CO 0-.1,- 0 O (0 W 0 O CO001 0 O 00) O 0 T- O 0 T- 1., 0 0 T O O T T 19,350 20,429 21,580 22,730 23,950 25,240 O CO CO 0) O N. N N 29,392 30,892 32,748 34,959 37,382 40,015 43,000 46,622 47,605 47,874 47,929 47,912 47,754 47,611 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft N.- CO MM CO 0) MM O 777777771010 N M 7 O (O CO OM CO 10 (O 7 7 O (0 7 7 (O (0 7 7 (O(0 hc0 M CO CO 0, M CO 0T- 7 7 N CO 7 7 7 (0 7 7 CO CO 7 7 O 7 0 (0 OM 0 CO 777777 0 CO 0 CO 0 (O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 19,720 19,827 19,942 20,056 20,177 20,305 20,441 20,576 CO 1. O N. O O O N N 21,051 21,271 21,605 22,118 22,700 23,406 23,598 _ 23,650 CO CO O CO CO M M N N 23,627 23,599 Basin Volume cu -ft 19,486 20,567 CO 0) O N.- CO N N N 24,090 25,381 26,743 28,104 29,535 31,037 32,894 35,107 37,532 40,168 43,158 46,785 0) CO O CO I O I0 O 7 7 48,093 48,077 47,918 47,775 N = 3 O co O 7 7 N ,- O) 0) CO CO N N ,- ,- ON CO CO M 7 ,- MM 0 0 O O 70 N. 7 O 0 ,- •- N0) 0 0 0 co N (V M I- 1 co O I'm N (V M OO 7 co 7 I.- M M 7 M 7 Q) O N`r (0 N N15 Flood Hydrograph Flow cfs 3.82 4.06 COOCOO 7V 4.53 4.77 5.01 5.01 5.25 _ 5.49 CO(0C (Or 8.58 9.29 7 O 6'M,-6600 W V r V 0 0 d 0,L -M1.00 U'2 W CC C W LO .1") Ci 0 O(00(01�1-- Ci O M000 Ci O Ci 0 MO N.- r-- Ci 0 M000) W .- Ci ,-N OO 71-- M001.0 ON 0 0 ,-000 0 0 0 0 Loss Rate in/hr Max 1 Low I( (00 O O 0.59 0.59 (N 0 O (0 0 0 (OO (OO 0 0 OCOn 0 0 0.87 1.01 O- CO '-,- 1.32 1.58 0 N O O 0.17 _ 0.14 0.08 0.06 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 . . 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr t00 (00 O O O N.O O O 0.73 0.76 0.79 0.79 0.83 0.86 CO 7 '-'-'-'- N M 1.56 1.85 coM(0+) O O 0.20 0.17 O7 0 O O RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.10 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 0)O I (Ni I.,. N N 2.2 2.3 77 N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 0)6 ,- O 0.6 0.5 MN 0 0 Time Minutes Hours O CO N CO 7 V N 0 7 O 7 0 CO 1� O CO 7 0 O CO 1- O 7 0 N 0 Cr) O 7 (f) CO N. O N- In 0) O CO N CO In 0) N 0 7 O In 0) CO N- O CO 0) 4') O CO 1,- CO 0) 4') N O O O (n (O O O O O N N O O O N. N N O O r CO N N O o CO O) N N 0 0 Cr) 0 N CO 0 0 0 CO CO O 0 N CO CO O 0 N 0) CO CO 0 0 co 7 CO CO 0 0 7 0 CO CO 0 0 0 0 CO CO Unit Time Period N O(f) 53 54 55 56 57 58 00(0D 0(ND 63 64 (OO((00 67 _ 68 (00N- I -r EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 00 5 5 5 2 C 0 V C 0 V 0 0 0 0 E 0 7 0 0 N W N W 7 N I� M Q) I. -O N O co ,,°0(0 (V CO., O (V (V M' 01 O N N a 7 N 7 N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C W J C6 U) m 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.00 448.01 448.01 448.03 448.05 448.08 448.12 448.16 448.21 448.27 CA CO7 cf ai V 7 V 7 448.50 448.59 448.64 I 448.68 448.76 Total In Basin cu -ft ac -ft O O OO . O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O N M O O O O 0.04 0.06 0.08 0.10 0.13 0.15 0.19 0.22 7 O CO N N N . O O O O O O O O O O O O O O O O O O O O O O O O O O O O O E V 228 437 O tCOO N 1,903 2,591 3,398 4,320 5,471 6,736 8,113 9,602 10,297 10,996 12,264 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 34 51 CO L0 CO 0 LO LO CO L0 CO0 CO CO CO0 CO0 LO L0 CO0 L0 L0 COCOO 85 103 103 120 120 37 103 120 N 6-- CO N N 276 277 278 279 282 286 1-. N N 303 311 320 331 342 354 O LO CO CO CO M 274 274 274 274 274 274 274 274 274 274 274 274 274 274 274 274 274 275 275 274 274 275 274 274 275 275 276 277 278 279 282 286 O OO)) N N 303 311 320 331 342 354 COO CO N- CO CO CO SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.05 C 0.00090 Low Loss Rate (percent) 85.00% 13,148 13,155 LO L0 CO M M 13,155 13,155 l0 L0 CO M M CO CO M M CO CO CO CO co M CO CO CO CO co M 13,168 13,175 l0 N- CO M M 0) CO V M M 0 I— CO M M 13,162 13,167 13,215 13,219 13,268 13,297 N CO s— M V M M 13,541 13,717 13,984 14,253 14,567 14,927 I.- 0 I.- r M co u) 11 16,407 16,988 17,259 17,532 18,027 Basin Volume cu -ft 34 51 51 68 51 51 CO L0 CO co CO CO CO LO N CO CO LO N CO CO 85 103 103 120 120 37 103 120 N f` W I- CO N N 342 419 O O O r 1,050 1,505 2,194 2,888 O CO r O M 7 5,792 7,067 8,455 9,956 10,657 11,361 11 12,639 Volume In cu -ft 34 51 51 68 51 51 51 68 O O CO O O LO OJ CO O LO OJ CO O M CO M O 120 37 CO O CV C) N N- CO 1.-- W O N N N M V U) CO CO V W CO CO CO V 613 737 O ^ CO O O 1,110 1,234 1,471 1,595 1,719 1,843 LO LOO 0 V O O O Flood Hydrograph Flow cfs 0.04 0.06 CO CO 0 0 0 0 CO CO 0 0 0 0 CO CO 0 0 0 0 0.08 0.08 O) O) O O O O O) O) O O O O O) T- O r O O T- CO O O CO 7 T- O O O T- CO T- T- O O �, 0) 0 0 O O 0.23 0.24 0.38 0.39 0.40 0.54 0.68 0.82 CO O O T- CO r N CO T- 1.63 1.77 L0 O) O N N CO CO T- T- co CI) C 15UCp K W 1 .0 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.01 0.02 0.02 O O O O CO M O O O O 0.05 0.05 CO CO 0 0 O O O) T- 0 O O 0.15 0.15 N- 0) O O CO L0 N N O O 0.27 0.29 CO CO Ln N O O O Loss Rate in/hr Max I Low O N CO O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O O O O O 0.075 0.075 0.075 0.075 10 O O O 0 0 O u0 O O 0 0 L0 O O N 0 0 0.090 0.105 O O N N O O 0.135 0.135 O O L0 uO 0 0 O u) L0 CO 0 0 O u) O O 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 u) u) O N N O CO O O O O I� CD . 0 0 N. N O CD 0 0 M O CD 0 0 O I-- 10 N 0 0 0.156 0.154 N 0 10 N O O 0.148 0.146 0.144 0.143 0.141 0.139 r uO CO CO O O 0.134 0.132 O CO CO N 0 0 I� uO N N 0 0 CO N N N 0 0 O CO N 0 0 I� uO 0 0 0.114 0.112 O 0) 0 O O I- O 0 0 O O 0.104 0.103 O CO O O O O . O O O Storm Rain in/hr L0 CO CO N O O O O 0.053 0.071 CO CO in N O O O O 0.053 0.071 t` I` O O O O 0.088 0.088 0.088 0.088 CO CO CO O O O O 0.106 0.123 CO N V O O 0.106 0.123 V V O O O O 0 N O O CD CD r I` O O CD V r O= T- O O N O N N N O O LO 0 O CD CV N O O 0.282 0.300 0.335 0.353 0.370 0.388 LO O CO CO CD L0 N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 7.12 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO MM 0 0 V 0 0 V V 0 0 0.5 0.5 0.5 0.5 Ln CO O O O I` O O 0.7 0.8 CD I` O O 0.8 0.8 OO 0 0 cp. OO T- T- T- T- 1.2 1.3 Ln N T- T- COI T- T- OO T- N v- N N N Ln OO ,. T- -N L') O 2 0.25 0.50 L0 O 1".... O O T- 1.25 1.50 1.75 2.00 2.25 2.50 L0 O r O N M 3.25 3.50 L0 O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 L0 O r O O I` 7.25 7.50 L0 O r O r O L0 O N l0 O N 8.75 9.00 9.25 9.50 N-O O O N L00 O O Time Minutes 15 30 45 60 LO O O O 135 150 165 180 CD O N 225 240 255 270 285 300 L0 O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 L0 OUl CD CMD CO Unit Time Period T- N M O. L0 CO t` CO 0 C"- T- N T- T- M V T- T- 15 16 I� W T- T- 19 20 N N N CO V N N 25 26 27 28 29 30 N COMM CO 7 M 35 36 I,- c0 CO M 39 40 N M V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J M 448.84 448.91 448.98 449.03 449.08 449.17 449.27 449.38 449.49 449.63 449.78 449.86 449.94 450.04 450.12 450.20 450.28 450.36 450.43 450.48 450.53 450.51 450.49 450.47 450.45 450.44 450.42 450.41 450.39 450.37 450.35 450.33 450.32 _ 450.30 450.28 450.26 450.24 450.23 450.21 450.19 450.17 450.16 450.14 Total In Basin cu -ft 1 ac -ft 7 01010101,r 0 0 (OO 0 0 O V 0 0 0.50 0.55 0 N.- (O OIC O O 01 h h O O 0.81 0.86 0 O0) OOOOO 0 0 Mr, 0 0M r % S. NO0)00 7 7. S. 7000000000000)0)0)0) S. OIC S. (DO,r(0 S%%%%%' N 00) co 0 0 I, co 0 0 0.95 0.94 (0 ,- 0)0)0) O O O (0 CO co (O CO 15,836 16,768 N � O CO N— 0) 21,649 23,855 26,178 29,074 � N Q) CO M CO CO 35,274 37,385 CO N- M M W CO V 43,260 45,028 46,683 47,885 49,089 48,593 48,105 47,663 47,223 46,875 46,535 46,202 45,763 45,332 44,908 44,479 44,035 43,610 43,215 42,793 42,356 41,937 41,520 41,105 40,675 40,263 39,836 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 386 395 404 406 408 412 416 421 426 432 438 441 V LO V V 459 468 475 482 489 494 499 497 495 493 491 490 489 487 485 484 482 480 478 477 475 473 472 470 468 466 CO ((0 CO V V V 386 395 404 406 408 412 416 421 426 432 438 441 444 451 459 468 475 482 489 494 499 497 495 493 491 490 489 487 485 484 482 480 478 477 475 473 472 470 468 466 (O (0 ,.- CO O O V V V SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.05 C 0.00090 Low Loss Rate (percent) 85.00% Percolation Area sf 18,521 18,971 0) 0) 0 M 7 0) 0) 19,595 19,780 0) 0) c- 0) O N 20,427 20,715 21,003 21,167 21,332 21,664 22,055 22,445 22,813 23,158 23,482 23,717 23,952 23,855 23,760 23,673 23,587 23,519 23,453 23,388 23,302 23,218 23,135 23,051 (C O CO 0) CO N N N N 22,804 22,721 22,636 22,554 22,473 22,391 22,307 22,227 22,143 C N m ; U 13,916 15,078 16,240 17,174 18,228 20,088 22,065 24,276 26,604 29,505 32,409 34,062 35,719 37,836 39,841 41,845 43,735 45,510 47,172 48,379 49,588 49,090 48,600 48,157 47,715 47,365 47,023 46,689 46,248 45,816 45,390 44,960 44,514 44,087 43,690 43,267 42,827 42,407 41,989 41,572 41,139 40,726 40,297 Volume In cu -ft 1,653 1,548 1,557 1,338 co O N N _ 2,390 2,626 2,749 3,327 3,335 2,090 2,098 2,562 2,456 2,464 2,357 2,251 2,144 1,696 M O N. n- O O N 0'' 148 154 47 53 d (O O V CO LO CO 0 V 00 0 0 0(0 V V LO (0 Flood Hydrograph Flow cfs 1.84 1.72 (0 0) I 7 1.62 2.52 CO N CO 0) N N (O O O (� M(0 3.71 2.32 M LO CO O N N M 7 (� f N N N O CO LO N N 2.38 1.88 0) On- 0 0 — 0 CO 0 0 0 0 CO CO 0 0 0 CO (. 0 0 0.05 0.06 0.07 0.06 0.04 0.06 0) CO 0 0 0 0 V CO 0 0 0 0 CO CO 0 0 0 0 V O V 0 0 0 0 0 0 Effective Rain in/hr _ 0.26 0.24 0.24 0.21 (0 O N CO O O 0.37 0.41 (0 N .4 (O O O 0.52 0.32 N 0 CO 7 O O 0.38 0.38 O (O (0(0 O O 0.33 0.26 CO 0 N 0 O O 0 0 0 O O N 0 0 O O N N 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 0.510 0.345 V O CO Tr O O 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 (OO (00 O O O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 M 7 M O O O O O O N-(0 0) O O O O 0.094 0.093 0 0) 0) O O O O 0.089 0.087 0.086 0.085 0.083 0.082 0.081 0.080 0.078 0.077 0.076 0.075 0.074 0.073 0.072 0.070 0) O O O O O 0 0 N. O O O O O 0 0 0.065 0.064 0.063 0.062 O O O O O O 0.060 0.059 0.058 0.057 0.057 0.056 0.055 0.054 7 (0 Na) (O (O (O O O O O O O Storm Rain in/hr ((0 M CO M O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 (O CO O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 (0 N- CO 0 O O n ((0 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 N- ((0 0 0 O O 0.035 0.053 0.053 0.053 (0 ((0 OD 0 0 0 O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 7.12 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 0) N- N. co 0 N N O CO N N 2.9 3.4 V CO (0 N CO N. N N 2.6 2.6 0,t N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 N(0 N 0 O O 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O (O O N ci 7 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O (O O N O O N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O (O O O N 0 N N N Time Minutes (OO n O O 690 705 720 735 750 765 780 795 810 825 840 855 870 885 O0 0) d) 930 945 coOn0O 0) 0) 0) O 1020 1035 1050 1065 W 00) O O 1110 1125 1140 1155 1170 1185 1200 1215 (0 � (O0N-0O) � � Unit Time Period 44 45 46 47 48 49 50 51 N(0 (O (O V 4) (O (0 56 57 co O) (O (O 0 O O N CO O O 64 65 CO I� O O CO 0) CO O LL OL N M N. r 74 75 CO N- � n CO 01 N. 0 CO CO 82 83 V (O CO CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm �§ `)( 450.08 450.07 450.05 450.03 450.01 449.99 449.97 449.95 Total In Basin cu -ft 1 ac -ft 0m MM 66 0.88 0.87 cow WM 66 0.85 0.84 MN mm 66 39,383 38,959 38,517 38,097 37,679 37,262 36,847 36,434 36,022 35,611 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 459 458 456 454 453 451 449 447 446 445 459 458 456 454 453 451 449 447 446 445 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.05 C 0.00090 Low Loss Rate (percent) 85.00% Percolation Area sf 22,055 21,972 mm coo 21,722 21,640 21,559 21,478 21,406 21,365 «| 2> f71071- �mm 38,973 38,551 38,131 37,713 37,296 36,881 36,468 36,056 Volume In cu -ft 7 34 14 34 34 34 34 34 00 CO Flood Hydrograph Flow cfs o o 66 0.02 _ 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Effective Rain in/hr 6666666666 Loss Rate in/hr Max 1 Low 0.045 0.030 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.052 0.051 0.051 0.050 0.050 0.050 0.049 0.049 0.049 0.048 Storm Rain in/hr mm mm 0.053 0.035 0.035 0.035 0.035 0.035 mm mm RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 7.12 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) CD CD CD CD CD CD CD CD CD CD ) 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 W0,00, 93 94 MM >-& 5.# \) 2 _„G =5 - § /m -g° n » R q 2 BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: BASIN H BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 448 0 0 13,135 0 0 0.00 449 1 1 6,255 19,390 16,161 16,161 0.37 450 1 2 2,025 21,415 20,394 36,555 0.84 451 1 3 4,610 26,025 23,683 60,238 1.38 WHERE: V= l7Ei—E2 Ai+Az+AiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 BASIN I DA -I 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 4 B 9 B PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION ACRES 0.470 47.890 3.269 1,350 ft 675 ft 464.0 ft 455.0 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AMC II LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT D 56 0.51 1.00 D 56 0.51 0.30 D 56 0.51 0.10 AREA 438.0 ft 49,700 sf 439.0 ft 54,375 sf 440.0 ft 59,209 sf 441.0 ft 64,195 sf 442.0 ft 69,345 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 401,066 202,167 BASIN I [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -I [3] AREA - ACRES 1.08 51.629 [4] L -FEET 199,561 4.58 1350 [5] L -MILES 179,153 4.11 0.256 [6] La -FEET 185,355 4.26 1.28 675.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.128 [8] ELEVATION OF HEADWATER n/a 464 [9] ELEVATION OF CONCENTRATION POINT 14.41 455 [10] H -FEET 441.22 3.22 9 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 35.2 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 5.93 [13] L"LCA/S^0.5 0.006 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 1.9 0.07 [16] LAG TIME -MINUTES 4.0 [17] 100% OF LAG -MINUTES 4.0 [18] 200% OF LAG -MINUTES 8.0 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 269,876 70,315 401,066 202,167 517,263 314,294 826,496 647,343 EFFECTIVE RAIN (in) 1.06 1.06 1.08 0.96 FLOOD VOLUME (cu -ft) (acre -ft) 199,561 4.58 198,899 4.57 202,969 4.66 179,153 4.11 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 194,891 4.47 1.22 185,355 4.26 1.28 177,030 4.06 1.34 108,262 2.49 2.19 STORAGE PROVIDED (cu -ft) (acre -ft) 237,233 5.45 PEAK FLOW (cfs) n/a 90.09 77.02 14.41 MAXIMUM WSEL (ft) DEPTH (ft) 441.37 3.37 441.22 3.22 441.10 3.10 439.99 1.99 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 1 1 LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 1.8 1.8 1.9 1.8 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0o N LL0 ,- o CO c o 0.0519 (0 co 0 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00347 (24-(T/60))^1.55 + 0.19 in/hr Undeveloped Condition: Low Loss = 90% II L co (n J 0 3 0 J 0 H J C H m U 0• T"E o .. >- • G u)o O' o C O al > y G CO U. 0 LOW LOSS RATE PER RCFC/2322 0.1000 0.6600 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0005 0.3453 0.0294 LO M O 1 AREA WEIGHTED AVERAGE 0.009 0.928 0.063 a W cC Q 0.470 47.890 3.269 N Ln SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) Ln 1,- 0 0 M O O 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] c o oO O 0 O PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 N O RI NUMBER [Plate E-6.1] (0 (0 (0 N 56 LAND USE PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] CO CO CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W ca 438.07 438.17 438.27 438.39 438.53 438.70 438.92 439.20 439.71 441.13 441.31 441.37 co 0.08 0.20 0.33 0.47 0.64 0.84 1.09 1.45 .-.- ci v Ma av m F co U 3,508 8,633 N 0 7 O 27,762 36,647 47,684 63,300 rn co CO ai 190,954 194,891 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft V in )0 C0 N in n M CO 363 368 W 00 CO 402 451 457 459 348 351 354 358 363 368 375 385 402 451 457 459 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 50,047 50,507 51,016 51,574 52,228 53,027 0) 00 o O M 03 )0 N 57,847 64,902 O 7 a0 0f O N O Basin Volume cu -ft 3,856 8,984 14,648 20,848 28,124 37,015 in O cc0 V coo 92,794 179,640 O 7 co 0)0) d 0 C 0 V 0 3,856 5,475 6,015 6,555 7,634 9,253 NO O `fp 29,494 87,248 N c0 N M N Flood Hydrograph Flow cfs 12.85 18.25 20.05 21.85 7 0 O 0) N c0 N 00 00 M 00 LO 98.31 290.83 40.74 14.65 0 C U 'cp t 0 ce g W 0.25 0.35 mN M 0 O O 0.49 0.59 CO N IA O O 1.89 5.59 0.78 0.28 Loss Rate in/hr Max 1 Low 0.53 0.62 c0 0 0) C0 r 0 0) m 0 1.92 5.07 0 0) 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 Storm Rain in/hr 0.62 0.73 co rn 0-0.000) O O co n'— O O-- o —7 co m N O) N L O— co co 7. O RCFC & WCD UAILIAML DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.38 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) O N C0 7 4.4 4.6 O CO u) )0 6.4 8.1 13.1 34.5 r W O M Time Minutes Hours 0.08 0.17 0) co N c0 0 0 0.42 0.50 00 r N 0 0 0 NMN A CO 0 0 O m 0) 0 '0 0 0) N N M 35 40 45 50 55 60 Unit Time Period - N 01 7 0) co 1---000,°‘-N } rC 0 — 0) 7 teWU 00W07 00c) W 0) WT 6.3. CU rL N 0) ' N 7 N- 0 O 0 r D Q O O J 0 LL W W W ZW C70 W Z W W* � Q 1- CO 0 O O Qct LL O V) Luw E ZW >>O WO <Lu K CO WTCU Q W J O OCf YQLu KLL Z.J. 0a U0<o WL,WO> 0 w 1 QQ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W = N V >>! m> 438_01 438.02 438_02 438.02 438_02 438.04 438_03 438.05 438_07 438.07 438_07 438.09 ,- N- O W 7 7 N CO OD W 7 7 438.36 438.45 IO (OD OD W CO CO 7 7 438.73 438.85 438.96 439.06 439.17 5 O (6 C (71 N 0.01 0.02 0.03 0.02 0.02 0.04 0.04 0.06 0.08 0.08 0.08 0.11 co N 00 0.29 0.33 0.43 0.53 0.61 0.72 0.88 1.02 CO N N 7 ,— ,— O m 0 U 436 873 �N _ 809 1,822 (MO� —N 3,657 3,466 3,675 4,687 MO) I�Oi 12,524 14,331 N (0(0 W N 26,556 31,160 38,166 44,367 49,761 55,554 61,744 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 346 346 346 346 346 346 346 347 CO CO C(D m CO CO C(D m 0 N(0 C(D (0) 7 C(D (+0) 357 360 362 365 369 373 376 380 384 346 346 346 346 346 346 346 347 I _ 348 348 348 348 350 352 CO 7 N LO CO CO 357 360 362 365 369 373 376 380 384 49,770 49,810 49,838 49,821 49,804 49,895 49,878 49,969 50,060 50,043 50,062 50,152 50,388 50,622 50,857 51,020 co M O CO W N 71 52,119 52,533 53,163 53,721 54,206 54,708 55,236 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C 0 N j j m> U 782 1,219 1,534 1,345 1,155 2,169 1,979 2,992 4,004 3,813 4,023 5,035 7h Nco CO (0010 IO co CO CO _ 18,899 23,511 I'-0 0) 0 (0 _ 38,535 44,740 _ 50,138 55,934 62,127 OO J C 3 U OND W N. r 662 156 156 1,360 156 1,360 1,360 156 (! M LO 2,964 2,964 2,964 2,162 4,568 4,969 3,766 4,969 7,376 6,573 5,771 6,172 6,573 Flood Hydrograph Flow cfs O f0 N N 2.21 0.52 LC)(( 0 7 LC) LO 0 7 4.53 0.52 CO Lt.) .— 7 9.88 9.88 CO N O) I— 15.23 16.56 12.55 16.56 24.59 21.91 19.24 20.57 21.91 Effective Rain in/hr 0.05 0.05 7 0 0 O O O) 0 0 O O 0 0 0 O O 0 0 0 0 O O 7 0 0 0 O O W O) O O W O O 0.29 0.32 0.24 0.32 0.47 0.42 0.37 0.40 0.42 Loss Rate in/hr Max 1 Low co 00 N N O O 7 0) CV CO O O 0.33 0.39 0.33 0.39 0.39 0.33 0) 0) CO CO O O co co 7 7 O O 0.48 0.44 I-- O) (O (0 0 0 N 0) (f) LO 0 0 N CO I- CO 0 0 CO 0) OD O CO O 0 0 0 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 Storm Rain in/hr COco COCO7 O O 0.28 0.39 0.39 0.46 0.39 0.46 CD CO O O 0.41 0.46 0.56 0.56 0.56 0.51 CO CO O O CON((0 O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.38 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) M M 7 (O 1.5 1.8 1.5 _ 1.8 1.8 1.5 (O co. 2.2 2.2 2.2 2.0 co I- N NCV V r CJ M M CM 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 N CO O O 0.42 0.50 0.58 0.67 0.75 0.83 ON) O O N— CO 7 N— N CO N— 1.42 1.50 1.58 1.67 r CO s—,— 1.92 2.00 2.08 5 10 15 20 N CO 35 40 45 50 55 60 (C0 On 75 80 CO 0) N O _ 105 110 _ 115 120 125 Unit Time Period N CO 7 IO (D I. CO O) O , N, 7 15 16 19 20 21 22 N N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm !\ Lu 439.36 439.60 439.74 440.10 440.47 440.90 441.17 441.20 441.21 441.22 441.22 3.17 3.78 4.17 4.21 ` = 72,339 86,135 93,910 114,908 137,898 164,483 \} 184,449 185,355 185,262 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 390 398 403 415 454 454 454 390 398 CO tr, 428 443 452 453 454 454 454 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 56,138 57,314 57,976 59,737 61,596 63,746 65,106 65,238 65,308 65,378 65,370 «§ + �! ® 72,729 86,533 94,312 115,323 138,326 164,926 _ ten /§ 184,903 185,809 185,716 )_ \ * ° 10,985 14,194 [\ ® Q 23,418 27,028 7/ e ®CO 1,360 1,360 361 Flood Hydrograph Flow cfs 78.06 90.09 Effective Rain in/hr 1.50 1.73 Loss Rate in/hr Max 1 Low 1.29 0.44 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.38 Storm Rain in/hr 0.90 1.75 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.38 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 CV 5.9 2.0 co co cx,6 Time Minutes Hours 2.50 2.58 2.67 2.75 LOCO COCV 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 COCO CO 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY \\'/\\\\00) PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm y- j m> 438.00 438.00 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 0 0 7 7 438.04 438.05 438.05 438.06 438.06 438.07 438.07 438.08 438.09 438.09 _ 438.10 I 438.10 Total In Basin cu -ft ac -ft O o 0000000000000000000,- CJ 6 O O N O O N CO O O CO CO O O a (0 O O (O CO O O CO I. O O CO CO 0 O 0) 0 0 O 0.-,- 0 6 0 0 M M0 a 283 403 522 720 h mr,- 0 M(00 (0 O) 0 Or) 2,253 2,526 2,800 3,073 3,347 _ 3,620 3,893 _ 4,165 co 71-- 4,983 f 5,332 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 (0 M Com') CO CO Com') C0) CO CO Com') 0)0)0)0)0) CO CO CO CO CO h- Com') C0) r n Com') 0) h n 0) 0) N- CO M M OD CO Com') M OD CO Com') M CO 0) Com') M (O (0 M M CO (0 M M CO (0 M M CO (0 M M CO (0 M M CO h- M M r r M M r r M M n CO M M N N M M O N M M CO 0) M M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 49,735 49,746 49,756 49,767 49,778 49,796 49,813 49,831 49,849 49,867 V 0 0 0 0 0) 0)Oi a 7 49,934 49,958 M I- 00 0 0 O O)0 V CO 50,032 _ 50,057 50,081 _ 50,106 50,130 _ 50,155 50,179 50,211 Basin Volume cu -ft 388 508 628 748 (O CO W O 1,263 1,460 1,657 1,854 2,051 2,325 2,599 2,873 3,147 3,421 7 r (000)) M M M N Lf) V V 4,786 5,059 0100 00 (0 (0 0 E 5 c C j O O > 0(O co 0 co V (O(0 0 0 7 V 0 CO 0 V 7 (0 (OM 7 V LO (0 MM 7 V LO (0 M 7 N LO CO N N 0 CO N N 0 CO N N CO 0 N N CO 0 N N 0 (0 CO N 0) 0 CO Flood Hydrograph Flow cfs 1.29 1.55 1.55 1.55 1.55 1.81 aD OD aD OD m- 1.81 2.07 n N- 0000 N N n N- N N 2.07 2.07 2.07 2.07 2.07 2.07 2.07 2.33 U) 0 U '(p L 0 E W N CO O O 0 0 CO CO O O 0 0 CO CO O O 0 0 CO CO O O 0 0 CO CO O O 0 0 CO 7 O O 0 0 7 7 O O 0 0 7 7 O O 0 0 7 a O O 0 0 7 a O O 0 0 7 a O O 0 0 7 a O O 0 0 Loss Rate in/hr Max 1 Low mr I- O O r r` O O n O N O O O O N N O O O O N N O O O CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO LLD N N O O (0(00(0 0 0 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 Storm Rain in/hr N O O 0.20 0.20 0.20 0.23 CO CO O O CO CO O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.38 LOW LOSS RATE - PERCENT 85.00% 0) U W U) 0 0 m 0 (O (D 0 0 (0 0 (D 0 (0 (- 0 0 n 0- 0 0 n0- 0 0 n 0000000000 0 0 0 0 0 0 0 0 0 0 (0 0 0 00) 0 Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 N 0 Cr, O O 1.08 1.17 (0 CO N co. 1.42 1.50 1.58 1.67 1.75 1.83 2.00 0 0 (0 0 Tm N (0 0 N M (0 0 M V (0 0 7 (0 (0 0 (0 0 (0 0 0 f-,_ (0 0 0 (0 0 0 0 (O 0 0) co 0 0(0 CD 0 Unit Time Period T- N CO V (0 (D r-- CO 0,_,_ N 13 14 15 16 17 18 0) N Tm NNN N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm CI. . y u J , CO 4= m> N ,.,. 00 CO M M 7 7 N CO 00 CO M M 7 7 CO V . 00 CO M M 7 7 0 0 . cd CO M M 7 7 438.16 438.17 CO 0 ,. cd CO M M 7 7 0 N N cd CO M M 7 7 N N N cd CO M M 7 7 N CO N N a00 M M V 7 438.25 438.27 O CO M M cd cd me" V 7 438.37 438.41 438.46 I 438.52 Total In Basin cu -ft ac -ft co_ 0 0 0 0 0 0 CO N- 0 0 0000)0 0 0 N 0 0 N NN 0 0 CO ,t NN 0 0 (0 I, NN 0 0 1` CO NN 0 O O CO CO CO 0 O CO O 00000 0 O 00) 0 O ON IO (0 0 O 5,604 5,953 6,302 6,651 7,000 7,348 (OO CD M 8,470 8,895 10,168 10,669 - - 11,666 _ 12,178 13,207 _ 14,234 M 19,381 _ 21,439 24,012 f 27,101 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0) O) 0LO 0 M CO 0) O 0 O M CO O O I[) O M CO O O I[) O M CO I[) O M CO I[) 0 M CO N N 1n (0 M CO N M 1n (0 M CO co co 1n O CO CO 0 0 10n L0 CO CO Lo (0 CO CO N- 0) CO CO 0 OD CO CO 349 349 349 350 350 350 350 350 LO LO (0(0(00) LO LO LO LO LO LO LO LO 354 354 LO LO co M 357 359 360 362 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C o (O N O d y U Q N CL (0(0000) CO(OO) NN 0 0 0 0 N NM 0 0 0 0 N (0(OO)Mr-- 0 MM 0 0 0 0 M0 N 000(0 0 0 0 0 CO 0 0 0 0 CO I0 (0000 (0 (O 0 0 0 0 0 (0 CO 0 0 0 0 CO MOOON N- h. 0 0 0 0 0(00),- n OD 0 CJ N O O) 0 O N (n 00) (0001- x-01 (n (n 00000 ) 0(O (n (n 0)(O CO N (n 0 Basin Volume cu -ft 5,953 6,303 6,652 7,001 7,350 7,698 8,047 8,395 8,820 9,245 9,670 10,095 10,520 11,021 CO N O O N I.O co O O N N 13,560 14,589 M N- , (0 0 N- 19,738 21,797 27,463 o N 9 ( C > 15 U co N00)0) CO (0 C00 CO (0 C00 0)0)0)0)h- CO (0 co 00(00(0 CO (0 r I� r n r r r 0 co n (1) r W(0 co co LO LO CO 0 O 0(O CO O.-.-.-.- ONO MM 00)00) 00000)0 r N N 710-7, N co' Flood Hydrograph Flow cfs 2.07 2.33 co CO co co N N CO CO co co N N CO CO co co N N 2.59 2.59 2.59 2.59 2.59 2.84 0 0 co co N N CO OM co N N co co 0 0 CO co co (O (O 8.06 8.06 CO r 0) ‘- C i U'Ip L m Q' .9 W 0000000000000000 OOOOOOOOOOOOOOOOOOOO 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N (00) 0 O 0) O O NN 0 0 000)('1 - 0 0 N 0 0 Loss Rate in/hr Max 1 Low co O N N O O O O N N O O O O N N O O O O N N O O OO CO N N O O OO OO N N O O W N CO O O CO CO O O 0.34 _ 0.37 0) 0) CO CO O O N N 0 0 O O 0.45 _ 0.45 a0 N. 0 0 O O 10(0 06 M M 06 M M 06 M M 06 M M 06 M M . . 0 0 M M . . 0 0 M M . . 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 Storm Rain in/hr 0.26 0.30 0 0 M M 0 0 0 0 M M 0 0 0 0 M M 0 0 CO CO M M 0 0 CO CO M M 0 0 0.33 0.36 CO (O CO CO O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.38 LOW LOSS RATE - PERCENT 85.00% 0 C C (n O) U W 752 CL 0 a m 0 00Cos 0 0 0Cos 0 0 000 0 0 Cos 0 0 00000,7,7,7 T- T- T- T- T- T- T- T- NM T- T- ,t ,t T- T- 1.0. 0. T- T- (0. (D. T- T- r,W T- Time Minutes Hours 2.08 2.17 N CO N N 2.42 2.50 2.58 2.67 r CO N N 2.92 3.00 3.08 3.17 N CO M M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 0 0 N CO x-.- 0 0 co mr 0 0 c O .- 0 0 0 CO x-.- 0 0 CO N. x-.- 0 0 r CO x-.- 0 0 CO 0) x-.-.- 0 0 0) O N 0 0 O N N 0 0 N N N 0 0 N CO N N 0 0 00 0 N N 0 0 0 0 N N Unit Time Period N CO N CO 29 30 31 32 CO M 35 36 M CO 39 40 41 42 0 0 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C w Vo W ca W CO 438.59 438.67 438.76 438.85 438.95 439.05 439.16 439.27 439.39 439.51 439.68 439.90 440.14 440.39 440.68 441.04 441.09 441.10 441.10 441.10 441.09 441.09 Total In Basin cu -ft ac -ft O O I�00000 O O O,-.—,-.—,-.—,- CO O �N O 7 7LOI�cOOM O CO Cr, I. N N 0 7 0070) N CO CO CO M CO CO (0 000000 7 7 CO (0 V V CO L0 V V 30,705 34,823 39,456 44,086 49,230 54,888 O co CO N 0 N T 1- (O O 0) CO 0 O 0) ,- M h CO 90,878 103,231 117,129 132,570 150,586 173,246 176,765 177,014 177,030 176,968 176,751 176,457 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft I() N. (OO M co O CO h 1- co co (O 0 Ih 00000)0) co co M 1- co co T. 0 co co T. CO OO 7 7 (0 11) T N 7I7 10 CO 0077010077 7 7 0) 0 7 7 0 0 7 7 0) 0) 7 7 101- (O CO co(0 co CO N- N co(0 (O0 r 00000)0) CO M CO 1,-.-- CO CO (0 CO CO CO OO 7 7 CO /1 �N 7 7 LO CO M7710O 7 7 CO 0 7 7 0 0 (077 7 7 0) 0) 7 7 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 52,492 52,863 53,279 53,696 54,158 54,652 55,177 55,703 56,272 56,885 57,718 58,770 59,916 61,165 N CO N 7 CO 7 N 7 CO CO 64,715 _ 64,734 64,735 _ 64,730 64,714 64,691 Basin Volume cu -ft 31,069 35,190 39,826 44,459 (00 N (0 0) 61,443 67,614 74,300 81,498 91,278 103,639 LO Q) ,, O fO0 ,, 177,214 177,463 177,479 177,418 177,201 176,907 . C 3 orD 0 O0 CO M 7 MM 00100 1n to 01- to O 1006000 M 10 O O OO r N T- Ci N 7061' MM L6 C N 0 CO M O CO CO 7 M MLO N 0 Flood Hydrograph Flow cfs 13.23 14.95 (00 (00 O O 18.40 20.12 W M N N 1l 000 M 0 N N 10 V, M N 00 7 47.71 52.88 61.51 77.02 N M O N 1.55 1.29 0.78 0.52 N iC .;'(p L Q' C W 00 NN 0 0 NN MM 0 0 100) MM 0 0 NN 7777000 0 0 100) 0 0 1010 0 0 NN W 07600000 0 0 1000107 0 0 0 0 MN 0 0 0 0 Loss Rate in/hr Max 1 Low 11M0 00) 66 0.59 0.59 (NO (00 666666 (00 (00 On r 0.87 1.01 00 CO 0 0 1.32 1.58 10 N 66 0.17 _ 0.14 0.08 0.06 (0(0(0(0(0(0(0(0(0(0(0(0(0(0(0(0(0(0(0(0(0(0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr CO M0 (00 6666 N.O N.O 0.73 0.76 0.79 0.79 0.83 0.86 O( N M 1.56 1.85 (MO CO0 66 0.20 0.17 00 O 66 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 125.3 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.38 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 0)O ON I. NN 2.2 2.3 77 N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 C0) O6 0.6 0.5 MN 00 Time Minutes Hours 0 CO N CO 7 V N 0 7 O 7 V CO 0- 10 0 7 V IO CO I- O 7 V N 0 CO 0 7 1(0 CO N. 0 0 ui 1(0 IO CO N CO ui 1(0 N 0 7 O ui 1(0 CO 0- LO O 11) (0 10 CO I. CO 11) (0 N O CO 0 110 (O If) 0 0 0 N N If) 0 CO N. N N If) 0100 r CO N N CO 0) N N N 0100 0) 0 N CO 0 CO CO LO 10 CO CO LO 6 0) CO CO LO CO 7 CO CO LO 0100 7 10 CO CO 10 CO CO CO Unit Time Period 1010 53 54 55 56 57 58 10 0 LO 000 63 64 CO(0O (D 67 _ 68 (D 0 O I-r EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C 00.E U U U U '� E CO 7 tO ( 0 ( O - cgN`�j f`•N N• O CO 0 CO0 • 0 7 ! 0 7 10 7 a r (O M 0 M N N LU F- 2! Z 0 W W W H w (.7 w1g 0 _ _p(Z0W7W( <0)>>WWWpmw a00CC5nWU OJZ 11 oo0 E - 0W i.c0 WWW WWW L 2 a 0 Q PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W m 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.01 438.01 438.01 438.02 CO O co m V V 438.06 438.07 438.09 438.11 438.14 438.16 438.19 438.22 N CO CO co m co V 7 V Total In Basin cu -ft ac -ft O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O N N O O O O 0.04 0.05 I- 0) O O O O 0.11 0.13 CO 0) O O 0.23 0.27 0) O 7 N CO co O O O O O O O 0 O 0 O O O O O O O O O 0 0 O O O O O O 78 156 358 559 760 1,085 N M co .O CV - 2,919 3,735 4,672 5,731 7,036 8,463 10,010 11,678 12,477 13,274 14,689 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 248 372 372 496 372 372 372 496 QD CD 0) V 620 620 620 620 620 744 744 868 OD CV O 0) 744 868 CV CV 0) 0) 1,038 1,038 1,038 1,038 1,039 1,039 1,040 1,041 CO O O 1,046 1,048 O O 1,056 1,059 O O O 1,036 1,036 1,036 1,036 1,036 1,036 0) CO O O 0) CO O O 1,037 1,037 1,037 1,037 1,037 1,037 1,037 1,037 1,037 1,037 1,037 1,037 1,037 1,037 1,038 1,038 1,038 1,038 1,039 1,039 1,040 1,041 V V O O 1,046 1,048 10 (0 O O 1,056 1,059 (D (ND (VD O O O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.19 C 0.00347 Low Loss Rate (percent) 85.00% N CO N co N- I-- O) O 7 a 49,733 49,745 M CO M CO I` I-- m 0 7 a 49,733 49,745 49,745 49,745 49,756 49,756 49,756 49,756 49,756 49,767 49,767 49,778 49,778 49,789 49,767 49,778 49,789 49,789 49,800 49,807 (D V N V CO CO Q) W V V 49,862 49,891 49,931 49,983 50,056 50,129 50,214 50,309 50,427 50,555 50,695 50,845 50,917 50,988 51,116 Basin Volume cu -ft 248 372 372 496 372 372 372 496 V V 620 620 620 620 620 744 744 868 00 0) 744 868 0) 0) O T- T- 1,396 1,598 1,799 2,124 2,572 3,144 CV 01 0) Q) I,.. M V 5,718 6,780 8,087 9,516 11,066 12,737 13,538 14,337 15,754 Volume In cu -ft CO N N r- 372 496 N N r- r- 372 496 (D (D 0) 0) 620 620 620 620 620 744 744 868 868 992 744 868 N N Qi 6, O 0 T- T- 0 0 N N v- T- 0 V N CO v- T- CO N co (D v- T- 1,860 1,860 1,984 2,108 2,356 2,479 CO I,- coOr N CV O O 0) co W V T- N Flood Hydrograph Flow cfs 0.28 0.41 0.41 0.55 0 7 O O 0.41 0.55 0.55 0.55 00000 (D (D 0 0 (D (D 0 0 CO (D CO 0 0 0.83 0.96 (D O O) r O— 0.83 0.96 O O 7 7 — T- 1.24 1.24 CO CO CO CO T- T- CO N CO u) T- T- (n D) (D r T- T- 2.07 2.07 2.20 2.34 2.62 2.75 2.89 3.03 f` r (n O O I` N N N 4) C0) 15 .c%1 a) 2 .0 W 0 ;E:7, O O Z"-.; 0 O O Z:.; 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 co 0 0 0 0 0) co 0 0 0 0 0) co 0 0 0 0 0.04 0.04 0.04 0.04 0.05 0.05 (D CO O O O O 7 7 (D O O O O O O Loss Rate in/hr Max I Low O N CO O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O O O O O 0.075 0.075 0.075 0.075 (n O O 0) 0 0 O u0 0) O 0 0 (f) O O N 0 0 0.090 0.105 O O N N O O 0.135 0.135 O O '- u- 0 0 O u0 (- (D 0 0 O u0 co co 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 (C) u0 O N N O CO O O O 0.663 0.655 0.647 0.640 0.632 0.625 I- O (D (D O O 0.602 0.595 0.588 0.580 0.573 0.566 0.559 0.552 0.545 0.538 CO N (f) u) O O CO T- (f) u) O O 0.504 0.497 0.491 0.484 0.478 0.471 0.465 0.459 0.452 0.446 0.440 0.434 0.428 0.422 0.416 0.410 0.404 0.398 ON) W CO CO CO CO O O O Storm Rain in/hr (D 0) CO N O O O O 0.053 0.071 CO CO (D N O O O O 0.053 0.071 I- t` O O O O 0.088 0.088 0.088 0.088 CO CO CO O O O O 0.106 0.123 M N V O O 0.106 0.123 V V O O D) D) lD N O O (D (D I� t` O O (D V r O T- O O N D) N N N O O (D u) (D (D N N O O 0.282 0.300 0.335 0.353 0.370 0.388 (D 0) CO (0 (D 0) N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 (D CO O O tO I- O O 0.7 0.8 (D I` O O 0.8 0.8 0) O 0 0 O O V- T- O- V- r- 1.2 1.3 (D N r- r- CO. N- r- r- 0) O r- N c- N Ni N u) (n r- C- N N C) 2 0.25 0.50 (n O 0., O O.— 1.25 1.50 1.75 2.00 2.25 2.50 (n O r O N M 3.25 3.50 (n O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 (n O r O (D I— 7.25 7.50 (n O r O r W (n O N (D oO N 8.75 9.00 9.25 9.50 1.,,O 0. D) O N CD ( (0 O O Time Minutes 15 30 45 60 O O O 135 150 165 180 CO O N 225 240 255 270 285 300 (D O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 (D O,r (0 ((0 (O Unit Time Period T- N 00 V 10 CO 0- CO 0) C"- T- N T- 0) V T- 15 16 0- W c- c- 19 20 N N N CO V N N 25 26 27 28 29 30 N CO CO CO 7 CO CO 35 36 I,- 00 CO CO 39 40 N CO V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J Iii N CO CO `X 438.31 438.33 438.36 438.38 438.40 438.46 438.55 438.67 438.80 439.03 439.23 I 439.29 439.34 439.46 439.57 439.68 439.78 439.86 0) W 0 6) 01 V V 439.99 439.98 439.96 439.95 439.93 439.92 439.91 439.90 439.89 439.88 439.86 439.85 439.83 439.82 439.80 439.79 439.77 439.76 439.74 439.73 439.71 439.70 439.68 Total In Basin cu -ft 1 ac -ft r- 0M CO 7 0 0 (4) ch 7 0 O 0.48 0.55 1f) 0) O h 0 0 (O MO 06) N h70) (n co. h 1.93 2.08 2.21 2.32 2.42 2.45 2.49 2.47 2.45 2.43 2.41 2.40 2.38 2.37 LO co co N (Si 2.32 2.30 2.28 2.26 2.24 2.22 2.20 2.18 O N N N O CO N O N (Si N CO 0 COO T. MO (O N- On O h a0 0) 20,858 24,110 28,426 34,624 41,874 53,471 65,280 I 68,222 71,386 78,067 84,131 90,402 O 1n OO (O 0 W 105,474 106,769 108,262 107,524 106,788 105,930 105,072 104,464 103,857 103,251 102,522 101,795 101,069 100,220 99,250 98,404 97,684 96,842 95,877 95,038 94,200 93,363 V1 O N. 7 (0O N O 01 0) 01 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft a0 O (0 r O O 1,072 1,074 1,076 1,083 N 6) O On— (0 n n- CO 1,158 1,164 0) (0 CO N CO 6) O— N CO N N N N O N M CO N N 1,235 1,233 N M CO N N 6) CO N N N N 1,227 1,226 Lf) CO N N N N 1,222 1,220 6) r N N 1,216 1,214 1,213 1,211 1,210 1,208 r l() M O O O N N N aO O (O r O O 1,072 1,074 1,076 1,083 N 6) O— On— (0 n CO 1,158 1,164 0) (0 CO N CO 6) O— N CO N N N N O N M CO N N 1,235 1,233 N M CO N N 6) CO N N N N 1,227 1,226 u) CO N N N N 1,222 1,220 6) I's N N 1,216 1,214 1,213 1,211 1,210 1,208 f- (n M O O O N N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.19 C 0.00347 Low Loss Rate (percent) 85.00% Percolation Area sf 51,243 51,359 51,474 51,567 51,671 51,964 M L- (n c- OD M 0) N N (0 u) 53,564 54,595 55,603 55,854 56,123 56,693 57,211 57,745 58,227 58,656 59,031 59,141 59,266 59,206 M 0 V ,- O 0 6) 0) (0 u) 58,997 58,945 M O) ,I- CO c0 a0 W (0 u) 58,779 58,717 58,655 58,583 58,500 58,428 58,367 58,295 58,212 58,141 58,069 57,998 57,916 57,845 57,764 N C N j N ; 0 U 17,168 18,456 19,742 20,777 nr CO 6) 0)V co N N W 29,517 35,727 42,990 54,609 66,439 69,386 72,555 I 79,248 00 LO m M (OO O) 97,264 102,298 106,704 108,001 109,497 108,758 108,020 107,160 106,301 105,692 105,084 104,477 103,747 103,018 102,291 101,441 100,468 99,622 98,900 98,056 97,090 96,249 95,409 94,572 93,611 92,777 91,819 Volume In cu -ft 2,479 2,356 2,356 2,108 2,232 4,335 5,406 7,301 8,366 12,734 12,967 4,106 4,333 7,862 7,256 7,474 6,862 6,247 5,628 2,527 2,728 496 496 372 372 620 620 620 496 496 496 372 248 372 496 372 248 372 372 372 a0 N CO v In v N CO N Flood Hydrograph Flow cfs 2.75 2.62 2.62 2.34 2.48 4.82 O (0 W 9.30 14.15 . (06 • 4.81 8.74 O M W c0 7.62 6.94 6.25 2.81 3.03 0.55 N 7 O O 0.41 0.69 COOCO0 O O 0.55 0.55 N 7 O O N 7 O O 0.55 0.41 0.28 0.41 0.41 0.41 N 7 N O O O Effective Rain in/hr 0.05 0.05 0.05 0.04 0.05 0.09 co N O O 0.18 0.27 0.28 0.09 co n-, O O it, co O O 0.15 0.13 , 0 LO O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max 1 Low _ 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 0 LO V O co O O OD V 0 co O O 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 (00 (CD 00 O O O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 M 7 LO M O O O O O O 0.375 0.370 0.364 0.359 LO V CO CO O O 0.343 0.338 0.333 0.328 0.323 0.318 0.313 0.308 0.304 0.299 0.295 0.290 0.286 0.281 0.277 0.273 0.269 0.264 0.260 0.257 0.253 0.249 0.245 0.242 0.238 0.235 0) N N N 0 0 N N N N 0 0 0.219 0.216 0.213 0.210 0 0 0 N N N O O O Storm Rain in/hr (M M CO CO O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 CO CO O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 M I,- CO 0 O O n (f) 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 N- (f) 0 0 O O 0.035 0.053 0.053 0.053 M (f) M 0 0 0 O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 6) I'- N co. (0 N N (O CO N N 2.9 3.4 V CO M N CO N. (V N 2.6 2.6 OD,t N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 Cl CO N 0 0 6 � 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O (f) O N ,i 7 N 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O (f) O N a0 W N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O (n O O N l6 N N N Time Minutes (00 n (O (D 690 705 720 735 750 765 780 795 810 825 840 855 870 885 O n- Cr, 0) 930 945 (00 n� 0) 0) O 0) O 1020 1035 1050 1065 W 00) O 0 1110 1125 1140 1155 1170 1185 1200 1215 M LO � 00 nCD � � Unit Time Period 44 45 46 47 48 49 50 51 N M (0 l0 V (0 u) N 56 57 CO 0) (O l0 O 0 (O N M (O (O 64 65 (O N- (O (O CO 0) (O (O LL OL N M C- r 74 75 (O N. c- n CO 0 N- O CO 00 82 83 V u0 (O CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J WLO N 0) m > 439.67 439.65 439.63 439.62 439.60 439.58 439.57 439.55 CO N Qi Qi V V Total In Basin cu -ft 1 ac -ft 2.06 2.04 2.02 2.00 co co orn M N— rn rn 1.89 1.87 89,786 88,834 88,007 87,058 86,110 85,165 84,220 83,278 I— co M 0 CO M N W CO Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 1,202 1,200 O) N- a, W LL) V O) W N 0 O) O) O) I, - W W N 0 O) I- U[) V N O 1,189 1,187 0 0 N N O) W O) O) O) O) SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.19 C 0.00347 Low Loss Rate (percent) 85.00% Percolation Area sf 57,693 57,612 57,541 57,460 57,379 57,299 57,218 57,138 57,058 56,977 C N E 90,988 90,034 89,206 88,255 87,306 86,358 85,412 84,468 83,526 82,585 N > m ; 1g U Volume In cu -ft 372 248 372 248 co coca cO W W N N N N N N Flood Hydrograph Flow cfs CO ch N 0.41 0.28 0.28 0.28 0.28 0.28 0.28 0.28 O O Effective Rain in/hr 0 0 0 0 0 0 E. 0 E. 0 0 0 0 0 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low 0.045 0.030 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 O) N- m 0.193 0.192 O O CO CO O O) N O) CO o��� O O O O O O O O Storm Rain in/hr 0.053 0.035 0.053 0.035 0.035 0.035 0.035 0.035 m m 0 co O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 51.63 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 3.99 UNIT TIME -PERCENT OF LAG 376% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) M N M N N N N N N N 0 0 0 0 0 0 0 0 0 0 c0 o2 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 W 0)) O) 0)) 93 94 0)) 00) C 5 5 5 C C U U C V U U U Ua coril— cum NN) Vm -5 740 ,- Q • 7nQ) . N 4OjW M 0 N O 7 O W rN(No (0 Co o - O) co m W 2 m J 0 > W D Q O x O z 06 0 W W U7 co gZW Q J jZ WWggWCOHO UOO a ce jjW O co » fZ W =Z>gJJyOiiOWWcowJOQ0a H W J U MI QZ J u W u.8 8 6 6 Q F i-2'OLLW d' W cc F- W Q BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: BASIN I BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 438 0 0 49,700 0 0 0.00 439 1 1 4,675 54,375 52,020 52,020 1.19 440 1 2 4,834 59,209 56,775 108,795 2.50 441 1 3 4,986 64,195 61,685 170,480 3.91 442 1 4 5,150 69,345 66,753 237,233 5.45 WHERE: V= 17E1—E2 Al+A2+AiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 EXISTING BASIN OFF-SITE NORTH 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 9 B PAVING/HARDSCAPE LANDSCAPING LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION ACRES 5.754 5.950 3,950 ft 1,975 ft 462.3 ft 442.0 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AMC 11 LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT D 56 0.51 1.00 D 56 0.51 0.10 AREA 438.0 ft 21,900 sf 439.0 ft 27,300 sf 440.0 ft 31,405 sf 441.0 ft 36,785 sf 442.0 ft 41,185 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 90,919 32,807 EXISTING BASIN [2] AREA DESIGNATION EFFECTIVE RAIN (in) OFF-SITE NORTH [3] AREA - ACRES 1.32 11.704 [4] L -FEET 50,090 1.15 3950 [5] L -MILES 59,063 1.36 0.748 [6] La -FEET 51,905 1.19 2.44 1975.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.374 [8] ELEVATION OF HEADWATER n/a 462.3 [9] ELEVATION OF CONCENTRATION POINT 4.43 442 [10] H -FEET 439.93 1.93 20.3 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 27.1 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 5.21 [13] L"LCA/S^0.5 0.054 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 1.5 0.16 [16] LAG TIME -MINUTES 9.5 [17] 100% OF LAG -MINUTES 9.5 [18] 200% OF LAG -MINUTES 19.0 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR I 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 61,179 11,089 90,919 32,807 117,260 61,345 187,362 128,299 EFFECTIVE RAIN (in) 1.18 1.37 1.32 1.39 FLOOD VOLUME (cu -ft) (acre -ft) 50,090 1.15 58,112 1.33 55,916 1.28 59,063 1.36 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 47,956 1.10 2.65 51,905 1.19 2.44 47,036 1.08 2.70 34,787 0.80 3.65 STORAGE PROVIDED (cu -ft) (acre -ft) 126,903 2.91 PEAK FLOW (cfs) n/a 21.77 18.81 4.43 MAXIMUM WSEL (ft) DEPTH (ft) 439.80 1.80 439.93 1.93 439.77 1.77 439.35 1.35 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 1 1 LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 1.0 1.1 1.5 1.5 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0492 0.4169 0 co 0 •1- d 0 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00242 (24-(T/60))^1.55 + 0.13 in/hr Undeveloped Condition: Low Loss = 90% II L H H o 3 o J J IIJ y C H ° J m U G J y R y• "Eo 0 in0re C G al > • G CO LL 0 LOW LOSS RATE PER RCFC/2322 0.1000 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0251 0.2359 0.2610 1 AREA WEIGHTED AVERAGE 0.492 0.508 (1) a7 w C a 5.754 5.950 o SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 00 000 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 00 RI NUMBER [Plate E-6.1] CO (0 0 0 LAND USE PAVING/HARDSCAPE LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] CO CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm M `44 438.17 438.24 mm 438.53 438.69 438.97 439.66 439.76 439.80 0.18 0.24 1.07 1.10 o 46,767 47,956 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 154 156 LO 0 164 168 172 178 189 208 211 213 154 156 0 m 164 168 172 178 189 208 211 213 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 22,181 22,509 22,864 23,245 23,679 24,193 24,814 25,663 27,183 30,024 30,439 30,606 Basin Volume cu -ft 46,979 48,168 o z 0 ; 0 1,278 1,645 1,768 1,890 )§&§/K(§ waw«<;ww Flood Hydrograph Flow cfs 4.26 5.48 5.89 6.30 7.12 8.34 §} 23.63 67.28 10.58 4.67 }J 2 o 0.36 0.46 0.50 0.53 6O6c40 0.90 0.40 Loss Rate in/hr Max 1 Low 0.53 0.62 1.92 5.07 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 Storm Rain in/hr 0.62 0.73 RCFC & WCD FIVDG011 Ctrl UAILIAML DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 52.7 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.26 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.4 4.6 6.4 8.1 13.1 34.5 Time Minutes Hours 0.08 0.17 0.42 0.50 35 40 45 50 55 60 Unit Time Period ;¥+;©+_+©#¥) 4§/6 70 02m/3 ; i, u-, -a, PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm WCO �> m> 438.00 438.01 438.01 438.02 438.03 438.05 438.06 438.09 0 0 co M 0 0 0 0 co M 0 0 438.20 438.23 438.27 438.30 438.35 438.41 438.45 438.51 438.58 438.65 438.72 438.78 438.85 0000 0 N C (71 N 0 0 0 0 0 0 0 0 0.02 0.03 0.04 0.05 (0 N- O O O O 0.08 0.09 (-(0 O O 0.15 0.17 0.20 0.23 0.25 0.29 0.33 0.37 000 7 7 O O O O m a= U 105 211 (0N 707 1,265 1,550 2,107 'Cgr)0 N(V C4 3,319 3,874 4,790 5,705 0)O 0M(NO vin ,r N- 00iO a00i n)0(0L V `-ci MO ,F,6 17,588 19,210 20,920 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 152 153 10 0) 153 154 155 156 156 157 00) 00 162 164 000 0I` 174 177 179 182 184 152 153 MM 0 0 153 154 155 156 156 157 157 158 160 161 162 164 166 168 0),- CO I. 174 177 179 182 184 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 21,957 21,980 21,963 22,026 22,089 22,212 LO 00) N CO N N N N N CO 0 0 N N N N LOCO W CO I. N N N N 22,989 23,190 CV 0) CO CO 0 M M N N 23,833 24,134 24,373 24,673 25,092 25,470 25,808 26,165 26,542 0 J 0'3,1 0 258 363 287 574 861 1,420 1,705 2,263 N M c4 a 3,477 4,032 4,950 5,866 6,781 7,513 8,789 10,155 0 0 CV 00 T N 0 CO 17,767 19,391 1 21,104 N . C 3 U 258 258 76 440 440 712 440 712 712 440 m r 1,076 1,076 1,076 894 V( 1,258 1,531 2,076 1,894 co co cr I� 0 0) ,_ ,_ ,_ Flood Hydrograph Flow cfs 0.86 0.86 N 0 O.-- 1.47 2.37 1.47 2.37 CO 0 NT- 1.77 2.37 3.59 3.59 3.59 2.98 W O O) 70'i O 01000000 0 CO N O CO Effective Rain in/hr 0 0 O O 0.02 0.12 CV N O O N O O 0.20 0.12 X N O O 0.30 0.30 0.30 0.25 mT. 0 O O 0.36 0.43 0.59 0.54 0 0 0 O O O Loss Rate in/hr Max 1 Low 0 CO ('(((0 O O 0 CO O O 0.33 0.39 0.33 0.39 0.39 0.33 IO 0) CO CO O O CO 0 "zr 0 O O 0.48 0.44 I,- 0) 0 0 0 0 N 0) 0 0 0 0 N 0 1 CO 0 0 CO 0 CO CO CO CO 0 0 0 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 Storm Rain in/hr MM O O 0.28 0.39 0.39 0.46 0.39 0.46 CO M O O 0.41 0.46 0.56 0.56 0.56 0.51 CO CO O O CONCO O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 52.7 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.26 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) M M I T- 7 0 I— T- 1.5 1.8 1.5 _ 1.8 1.8 1.5 0 CO I— T- 2.2 2.2 2.2 2.0 CO r N CJ 0 r N CJ M M (Ti 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 N M O O 0.42 0.50 0.58 0.67 0.75 0.83 ON) O O N— 0 7 N— N M N— 1.42 1.50 1.58 1.67 r CO T- T- 1.92 2.00 2.08 5 10 15 20 N M 35 40 45 50 55 60 (00 CN. - n 75 80 W 0) O C CD _ 105 110 _ 115 120 125 Unit Time Period , N 0 0 I O 0 0- 0 0) O° 7" 2 7 15 16 T- T- 19 20 21 22 N N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm �\ ° 438.96 439.09 439.16 439.33 $$ 439.88 439.90 439.92 439.93 439.93 0.54 0.62 0.67 0.78 15 2 23,626 27,056 (\ 39,687 46,008 7[ 51,409 51,905 51,770 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 204 211 215 215 216 216 216 194 199 204 211 215 215 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 27,138 27,678 27,967 28,676 29,447 30,333 30,925 31,020 31,089 31,159 31,140 «0 9 �! ®4&</m;2G (f \f 51,625 52,121 51,987 § B 2,895 3,622 2,258 5,258 %®&&=w w; Flood Hydrograph Flow cfs 9.65 12.07 7.53 17.53 19.04 21.77 14.80 2.98 2.37 2.37 0.27 Effective Rain in/hr 0.82 1.02 1.25 0.25 Loss Rate in/hr Max 1 Low 1.29 0.44 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 Storm Rain in/hr 0.90 1.75 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 52.7 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.26 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 CO CV 5.9 2.0 CO Cq COCV Time Minutes Hours CV CV CV0 2.50 2.58 2.67 2.75 LOCV 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 CONo co 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY � \ \ ) )r 0 Lc,C'1 \ § PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W al COm 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 I 438.00 Total In Basin cu -ft ac -ft O O O O . . 0 0 O O O O . . 0 0 O O O O . . 0 0 O O O O . . 0 0 O O O O . . 0 0 O O O O . . 0 0 O O O O . . 0 0 O O O O . . 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O 0 0 O O O O O O O O O O O O O O O O O O O O O O O O Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 88 106 O O 106 123 NT. NT. NT. NT. N% N% N% N% N% N% (") N 10 N 10 N 10 N 10 N 10 N 10 N ID N ID N CV N CV NV N 10 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 21,919 21,923 21,923 21,923 21,923 21,927 21,927 21,927 21,927 21,927 21,927 21,903 21,903 21,903 21,903 21,903 21,903 21,903 21,903 21,903 21,903 21,903 21,903 21,929 Basin Volume cu -ft 88 106 0 0 0T. 123 123 7 7 7 7 7 7 7 7 VI N E 4= i ID ID ID ID C) COC) COC) CO Flood Hydrograph Flow cfs 0) IO N CO 0 0 IO In CO CO 0 0 LO CO V 0 0 7 V 0 0 T- 7 V 0 0 0.41 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.44 C) 0 U 'Ip L W 10 C W N M O O 0 0 CO M O O 0 0 CO M O O 0 0 CO M O O 0 0 CO M O O 0 0 CO 0 O O 0 0 0 0 O O 0 06 0 0 O O 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 7 O O 0 0 Loss Rate in/hr Max 1 Low r _ O O nr _ _ O O n O N O O O O N N O O O O N N O O O CO N N O O COCO N N O O COc0 N N O O CO c0 N N O O CO c0 N N O O CO c0 N N O O CO ID N N O O 0 0 N 0 0 N 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0 NNNNNNNNNNNNNNNNNN <.D 0 0 N <.D 0 0 Storm Rain in/hr N O O 0.20 0.20 0.20 0.23 co co O O co N O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 52.7 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.26 LOW LOSS RATE - PERCENT 85.00% O C C In 1)) U W N L a m a IO ID 0 0 COID 0 0 COI— 0 0 I` I` 0 0 I` I` 0 0 I` c0 0 0 CO c0 0 0 CO c0 0 0 CO c0 0 0 CO c0 0 0 CO c0 0 0 CO O) 0 Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 N O O) O O 1.08 1.17 IO M N co. 1.42 1.50 1.58 1.67 1.75 1.83 2.00 O In O N In O NCO In O CO V In O 7IOIn In O co In O co f— In OIn rOOO On C) I 0 O) 0 CD � 0 0 CDT— L 0 Unit Time Period c- N CO IO ID I -CO CD N 13 14 15 16 17 18 0)N N. NN NN PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C W Io � N m> 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 0 0 W W M M .1-1-1-1-1-1- 0 0 CD CO M M 0 0 CD CO M M 438.04 438.05 438.06 438.08 I T' CD CO M M 7 7 I W a0 CO M M 7 7 T. N N a0 CO M M 7 7 CO M a0 CO M M 7 7 Total In Basin cu -ft ac -ft o000000000 00000000000000000000°,-,-,-,-,- 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 N M 0 0 M7O 6 O N-OO 6 O 0 O N 0 O (DCO 0 O 0 0 0 0 0 0 0 0 O N 0 0 288 383 0) a 0, LomN M M T CO CO I T' n- ,r p N CO 3,688 4,363 5,155 5,946 6,852 f 7,875 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 7 CO co co co co co M N CO Ln O M COMM Ln O Ln O V .0.N In o 0 Lo Lo CD T.O CO QD NN N O NN N O NN N O NN N O C'4C0 N O MC0 N O MC077 N O N O 155 155 156 157 158 159 O (0(0 1 164 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C 0M0) m M N O y 0 QN y 0 O N MM N N 0)0) N MM N N 0)0) N N MM N N 0)0) N N MM N N OO OIC MM N N ho M Mp N N MO M O OO'-'- N N N N NM MIS N N N N O M O d NC N N N N M 1� I` M 7 M N N N N OO 7 M I�OON N N N N O)M 0 7 M M N N MO 7 0 (O M M N N Basin Volume cu -ft 7 M 131 131 131 131 131 131 249 345 440 536 632 _ 845 1,057 1,269 1,598 2,044 O (OO O CJM t N' CO If) M7OOI,O O M T.N M 0 0 N E 5E U'r 15 M M M T' T M M T' T M M T' T M M N N M M N N M O N M O O M M M O 7 (O O O I- N M CO CO N LN M M OM Flood Hydrograph Flow cfs 0.05 0.44 0.44 0.44 0.44 0.44 0.44 0.44 M M O O O O M M O O O O M N O N O N N N N O O O N 2.39 2.39 2.78 2.78 3.17 3.17 WW O M M M U) C 0 .5 L M CC E W 0 7 0 0 0 O 7 7 0 0 O O 7 7 0 0 O O 7 7 0 0 O O 1. 1. 0 0 O O 1. 1. 0 0 O O 1--0 0,-,-.-,-.- O O 0 0 O O 7 1 O O 0 0 N N O O6 7 7 N N O 1--1 N N O 6 0 7 M M o o Loss Rate in/hr Max 1 Low M U N N O O 10 U N N O O 10 U N N O O 10 Lo N N O O O O N N O O O O N N O O O N M O O M M O O 0.34 _ 0.37 M M M M O O N N 7 7 O O 0.45 _ 0.45 O 7 LL) O O NNNNNNNNNNNNNNNNNNNNNNNNNN 0 0 0 0 0 0 0 0 0 0 . . 0 0 . . 0 0 . . 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr 0.26 0.30 O O M M 0000000000 O O M M O O M M M M M M M M M M 0.33 0.36 (0(0 mm O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 52.7 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.26 LOW LOSS RATE - PERCENT 85.00% M C Ln U W 7p0) O_ a a m a OM 0 0 MM 0 0 MM 0 0 MM 0 0 00000 T- T- T- T- T- T- T- T- NM T- T- 77O T- T- 10 T- T- OO T- T- 1-O T- Time Minutes Hours 2.08 2.17 N CO N N 2.42 2.50 2.58 2.67 N CO N N 2.92 3.00 3.08 3.17 N CO M M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 LO O NM LO O Mmr LO O c LOOOO(. LO O LO O LO O rOOM LO O ,- LO O MOO N LO O N N LO O N N N LO O NM N N LO O M77O N N LO O N N Unit Time Period N N N N 29 30 31 32 M M 35 36 1,..W M 39 40 41 42 V V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J COW 4 N 0 m (0 V O co CV CV V V 438.47 438.53 438.59 438.65 438.72 438.79 438.87 438.95 439.04 439.15 439.27 439.39 10 n O) 0) CV CV V V 439.77 439.76 439.76 439.76 _ 439.75 439.74 Total In Basin cu -ft ac -ft V NN 0 0 h O NM 0 0 CO N MM 0 0 O V V 0 0 0) CO V 0001 0 0 Cr, CO 0 0 V CO CO 0 0 CO 10 CO 000. 0 T- 03 CO TT � CO N. 0000 S. N. 1` 1` S. N. N(0 (0 ON �O V O 0) O OO �(0 n CO N- V O0- `I(O CO (0 CO 0) V Rc CO11) O (0N (0 N N ON h 0- 0- CO OO N N OO 0) CO (1(0 NOOO (0 (0 N V V O0) V V i0 (O CO (1) 00) 1.00000 R V O (0 NN CO (0 V V CON (00) O(0 V V Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft (00 ((00 170 172 174 177 COOW 185 188 0)00)) 197 201 205 211 (11 N N N N N N N (00 ((OO T- T- 0- T- T- r 0-000(0000(00) T- T- T- T- T- T- 0)0)0 T- T- T- N o N N lq N N - N N N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 23,919 24,195 24,496 24,797 25,124 25,475 N (0 (O N CO N N O N N 26,630 27,056 27,498 27,933 28,417 28,949 29,563 30,324 30,477 _ 30,466 30,451 _ 30,433 30,411 30,387 Basin Volume cu -ft V CD CO N. 14,656 16,254 0 ((00 r) 21,503 23,443 25,966 29,072 CV 0 CO (N+) (0 40,717 46,154 47,247 47,167 47,061 46,938 46,779 46,603 C 3 D V ON Ma x -N- 0(0 CO CO Ou) x -N- O(0 (00-0)0) (Or x -N- 000-(0—r 00(00 x -N- ON NN 0) I—N N0) 0) V 00Mt 0000 Ma 1`N 71. V 0 (0(000 00 ,0 Lo (0(0 Flood Hydrograph Flow cfs 4.35 4.74 co CO (0 (0 ((NO 0) 6 u) COO M O O COOCO O 1: O O 0) O 12.16 13.34 15.29 18.81 4.35 0.44 COON O O N- N- O O N C Q' C W 1-(0 0 0 0 VMM 0 0 1V- 0 0 0 MM 0 0 1-001-(0 0 0 0 0 MM— 00 IC"; (0V 0 0 MN 0 0 00 0 0 Loss Rate in/hr Max 1 Low (((0O u0) O O 0.59 0.59 (NO((00 0 0 (00(00 0 0 Onr 0 0 0.87 1.01 O— CO .-,- 1.32 1.58 0)N O O 0.17 _ 0.14 0.08 0.06 CO 0 0101010101010101(01010100(0 0 0 CO 0 0 0 CO 0 0 0 CO 0 0 0 CO 0 0 0 CO 0 0 0 CO 0 0 0 CO 0 0 0 CO 0 0 0 CO 0 0 0 CO CO 0 0 Storm Rain in/hr ((0O (OO O O O N.O O O 0.73 0.76 0.79 0.79 0.83 0.86 O 7 .-,-.-,- N M 1.56 1.85 CO(0COO O O 0.20 0.17 O— 0 O O RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 52.7 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.26 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 0)O .-(Ni I-. N ('1 2.2 2.3 V V N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 a? a' .-O 0.6 0.5 (0N OO Time Minutes Hours 0 CO N CO v v N 0 V (0 V v O 0- 0 CO v v LO CO Is O v v N 0 0) 0 v ui CO N. 0N- ui ui 0 CO N(0 ui ui N 0 V (0 ui ui CO 0- (0 CO ui ui 0 CO I. CO ui ui N O 0) O ui 0 (0 0 0001 N N (0 0 N N (0 0 1.000) N N 0 0 N N 0 0 0)00 N CO 0 0 CO CO (0 0 N CO CO (0 0 N(0 CO CO (0 0 (0 V CO CO (0 0 V 00O CO CO (0 0 CO CO Unit Time Period (0 N 53 54 55 56 57 58 (00 (OD O (ND 63 64 CO0CO0 67 _ 68 (00 0 I- r EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 ID I C 0 V 5 0 () 0 0 x 0 co ON 0) O V M O O O M co V N N N 01 0(0 (0 ? (0 V N LU F- CD 0 W W W H 0 0 W J 7 Z W W H O 0U 2200 q�J� LL00)CC 7((,)(~o ZW J——(iWCiW cL §0)>>C7WpmJW a0~0c(1)N(L .0ZJ W0077 ca ¢<W I- CO JDce ai-QMwi (irY2 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J N U) 0 0] 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.01 438.03 438.06 438.06 I 438.06 438.08 Total In Basin cu -ft ac -ft O O OO . O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O6 O O O O 0.02 0.03 CO 0) 7 O O O . O O O O O O O 0 O 0 O O O O O O O O O 0 0 O 0 O O O O O O O O O O O O O O O 0 30 289 777 1,492 0) (0 O V W Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft CO V N CO V N CO 7 V CO CO 7 N CO N N 7 a 7 a 141 169 0)r.... (6 W 197 225 0) 1) (6 W 225 225 253 253 CONCO CV 281 309 337 365 422 422 450 69 458 460 462 465 N N IT V V V 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 457 458 458 458 458 458 458 458 458 458 457 458 460 462 465 N N r- 0 (0 O V V V SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00242 Low Loss Rate (percent) 85.00% N 0) O) 0) < < N N 0) N (NI O) 0) < < N N 0) 0) O) 0) < < N N 0) N T- N 0) 0) < < N N N N N N 0) 0) < < N N (0 CO 0) 0) < < N N (0 CO 0) 0) < < N N I) M CO 0) 0) < < N N r M M V 0) 0) < < N N 21,943 21,949 I� M co V 0) 0) < < N N 21,949 21,949 21,956 21,956 21,962 21,962 N CO (6 (O 0) 0) < < N N 21,974 21,980 21,993 21,993 O) N O) c- 0) 0) < < N N 22,007 22,065 CO CO T- (0 < < N N N N 22,321 22,311 22,414 Basin Volume cu -ft CO CO CO CO CO N 7 a 7 a 141 169 (06 W 197 225 (00 W 225 225 253 253 CONNN 281 309 337 365 422 422 450 69 488 749 1,239 1,958 V I -- Q) W CO s— N Volume In cu -ft 56 84 N OD= OD CO N OJ ,- V N (V ,- V V V 141 169 6) I.--6) O O 197 225 I. --I.-- O O 225 225 253 253 281 281 281 309 N CO M 422 422 450 69 488 719 0 O 6N) - N N N V V 0)) Flood Hydrograph Flow cfs co 6) 0 0 0 0 O) N 0 c- 0 0 O) 6) 0 0 0 0 O) N 0 r 0 0 0.12 0.12 (O (O _ O O (O (_O O O (O 6) O O O) N T- N O O N N N N O O O) N T- N O O N N N N O O CO CO N N O O CO CO O O 0.31 0.34 0.37 0.41 0.47 0.47 0.50 0.08 0.54 0.80 (D O CO 0) r 7 7 7 0 0 0 N C 15U(p 1 K .0 W 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 co co 0 0 0 0 co co 0 0 0 0 co co 0 0 0 0 0.04 0.04 0.04 0.01 0.05 0.07 co O .-- O O 7 7 co 0 0 0 O O O Loss Rate in/hr Max I Low O N O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O O O O O 0.075 0.075 0.075 0.075 N O O 0) 0 0 O N 0 O 0 0 N O O N 0 0 0.090 0.105 O O N N O O 0.135 0.135 O O N N 0 0 O N N (6 0 0 O N 00 6) 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 N N O N N OO O O O 0.461 0.456 0 N N V V V 0 0 0.440 0.434 0.429 0.424 0.419 0.414 0.409 0.404 6) V 6) 0) CO CO O O 0.389 0.384 0.379 0.374 0.370 0.365 0.360 0.355 (6 N V CO CO O O 0.341 0.337 N W CO N CO CO O O 0.323 0.319 0.315 0.310 0.306 0.302 0.298 0.293 0.289 0.285 I,- CO I,- N N O O CO 6) N n N O (NN N O O O Storm Rain in/hr N co CO N O O O O 0.053 0.071 co co N N O O O O 0.053 0.071 I) n O O O O 0.088 0.088 0.088 0.088 co (6 CO O O O O 0.106 0.123 co N V O O 0.106 0.123 V V O O 6) 6) N (1) O O (6 (6 I� n O O (6 V r 6) c- O O N 6) c- N N N O O N N (6 (6 N N O O 0.282 0.300 0.335 0.353 0.370 0.388 N N CO (6 (6 N N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 158% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 N (D O O (6 I) O O 0.7 0.8 (0 n O O 0.8 0.8 O) O 0 0 O O T- T- O 7 T- T- 1.2 1.3 N N T- T- (6 I) C- C- 6) O,— C- N N N N N N . -N T- N. - L') 0 2 0.25 0.50 N O f-.... O 0 c- 1.25 1.50 1.75 2.00 2.25 2.50 N O r O N M 3.25 3.50 N O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 N O r O (6 I) 7.25 7.50 M O r O r W N O N N O0 W 8.75 9.00 9.25 9.50 N O r„.. Q) O N O(0 O O Time Minutes 15 30 45 60 O O O 135 150 165 180 0) O N 225 240 255 270 285 300 N O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 N O 10 (6 tP (6 Unit Time Period N co V N (O I— CO 6, O,— c- N c- c- M V c- 15 16 I) W c- c- 19 20 N N N CO V N N 25 26 27 28 29 30 N 0)0)0)0)CO CO 7 35 36 I) 00 CO 07 39 40 N CO V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm QUI N co 438.10 438.11 438.13 438.13 ,N cy o5 CO V V 438.28 438.37 438.47 438.61 438.75 I 438.81 438.87 438.96 439.04 439.11 439.17 439.23 439.29 439.32 439.35 439.33 439.32 439.30 439.28 439.27 439.25 439.23 439.22 439.20 439.19 439.17 439.15 _ 439.13 439.12 439.10 439.08 439.07 439.05 439.03 439.02 439.00 438.98 Total In Basin cu -ft 1 ac -ft 0.05 0.06 r. r- OOO . 0 0 CO N(0 c—N— 0 0 NN 0 0 LO M7 0 0 CI CD V 0 0 0.49 0.54 0.59 0.64 CO N(O CO hI. 0 0 c00000 h 0 0 CO N 0 0 C N. h 0 0 0.75 0.74 0.73 0.72 0 I. h(O . O O 0) CO . C O O 0.67 0.65 0.64 0.63 0.62 0.61 0 0) (OU) O O I, C U) U)U) U) . . O O O 2,374 2,729 CO N N CO M M 3,466 5,094 CO O CO CO W qi 0 11,647 15,066 18,506 19,915 21,353 23,565 25,619 27,700 CO CD CONCO N M 32,990 33,874 34,787 34,301 33,816 33,304 7 N. M M M 31,890 31,440 30,963 30,487 30,014 29,513 28,986 28,488 28,020 27,525 27,004 26,512 26,022 25,533 25,017 24,531 24,018 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 469 471 473 473 474 482 490 501 NN U) U) 544 550 557 567 574 580 585 590 595 598 O 0 0 ) C U) 598 596 595 593 592 591 589 588 586 585 CO CO(O U) U) 581 579 578 576 575 573 N CD O U) U) C 469 471 473 473 474 482 490 501 512 528 544 550 557 567 574 I 580 585 590 595 598 O 00) C U) 598 596 595 593 592 591 589 588 586 585 583 582 581 579 578 576 575 573 N O� (0O U) U) U) SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00242 Low Loss Rate (percent) 85.00% Percolation Area sf 22,525 22,604 22,691 22,704 22,767 23,126 c, .-- OD M CO U) O M V N N 24,574 25,330 26,090 26,401 26,719 27,208 27,530 27,822 28,092 28,339 28,565 28,689 28,817 28,749 28,680 28,609 28,537 28,473 28,410 28,347 28,280 28,213 28,147 28,076 28,002 27,933 27,867 27,797 27,724 27,655 27,586 27,518 27,445 27,377 27,305 C E CT) m (p m ; c) 2,843 3,200 3,596 3,655 U) V I,- O) U) M U) 0 CO N CO V CO R O) 12,159 15,593 19,049 20,465 21,909 24,132 26,192 28,280 30,208 31,976 33,585 34,472 35,388 34,900 34,413 33,900 33,388 32,934 32,482 32,030 31,552 31,075 30,600 30,098 29,569 29,070 28,601 28,104 27,581 27,088 26,596 26,106 25,589 25,101 24,587 Volume In cu -ft 973 826 867 532 0) 0) O N. N 2,335 2,748 2,973 3,947 3,984 1,959 U) 0) 0) I,- O) Ir-. N N N- N C C CO N N 2,508 2,354 2,199 1,482 Tr N U) 112 84 84 141 141 141 N N 112 84 56 84 112 84 56 84 84 84 C CO CO W C Flood Hydrograph Flow cfs 1.08 0.92 0.96 0.59 0.84 2.34 O) U) CO O N M 3.30 4.39 4.43 2.18 2.22 3.09 2.92 2.96 CO N N CO N N 2.44 1.65 CO NN (O T-, — 0 0)0) 0 0 0 CO 0 0 0 (0 CON 0 0 NN _ _ 0 0 0) 1 0 0 0 (00) 0 0, 0 0 N 0) 0 0 0 (O 0) 0 0 0 0 0) 0) 0 0 0 0 (0 0) (O 0 0 0 0 0 0 Effective Rain in/hr co co O O 0.08 0.05 O N O O 0.22 0.26 0.28 0.37 CO c- O O N N O O 0.25 0.25 0.24 0.22 0.21 0.14 0.14 0.01 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 0.510 0.345 V O ( CO Tr O O 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 00 O CO O O O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 M 7 M O O O O O O 0.261 0.257 0.254 0.250 0.246 0.242 0.239 0.235 N c0 M N CV N O O 0.225 0.221 0.218 0.215 0.211 0.208 0.205 0.202 O) (O 0) 0) O O 061.'0 £61.'0 0.187 0.184 W CO I- 0 0 (D CO I,- I` 0 0 W N- (O 0 0 (D CO (D (O 0 0 0) (D U) 0 0 co 7 U) U) 0 0 N O U) U) 0 0 0.148 0.146 N M V V NI - 0 0 0 Storm Rain in/hr IM M CO CO O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 U) CD O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 U) N- CO 0 O O N- IM 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 r- IM 0 0 O O 0.035 0.053 0.053 0.053 M IM M 0 0 0 O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 158% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 co I- N co. U) N N co co N N 2.9 3.4 V M M N CO I- (V N 2.6 2.6 U) Nt. N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 N CO N O O O 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O U) O N Ni Ti 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O U) O N 00 C N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O U) 0 O N U) N N N Time Minutes (00 n co (D 690 705 720 735 750 765 780 795 810 825 840 855 870 885 O C O) 0)O) 930 945 (00 n� O) O O) O 1020 1035 1050 1065 W 00) 0 O 1110 1125 1140 1155 1170 1185 1200 1215 LO C co 0 n 00) Unit Time Period 44 45 46 47 48 49 50 51 N M U) N V U) U) N 56 57 000)0 U) U) (O (O N CO (O (O 64 65 CO I,- (O C COO) CO CD LL OL N M (� r 74 75 (O �COO)0 (� n N. F.- CO CO 82 83 V CAC CO CO CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm m\ 438.96 438.94 438.92 438.90 438.88 438.86 CO CO f) 438.80 438.78 Total In Basin cu -ft 1 ac -ft 0.54 0.53 0.49 0.48 23,536 23,028 22,550 22,046 21,545 21,046 20,549 20,055 19,563 19,073 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 567 564 562 560 558 555 553 551 548 546 567 564 562 560 558 555 I 553 551 548 546 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.13 C 0.00242 Low Loss Rate (percent) 85.00% Percolation Area sf 27,201 27,089 26,984 26,872 26,762 26,651 26,542 26,432 26,324 26,215 «| 2> f 24,103 23,592 23,112 22,606 qR 21,102 20,605 a= Volume In cu -ft 84 56 84 56 56 56 56 56 CO CO LO LO Flood Hydrograph Flow cfs CO CO CD CD CO CO CD CD CO CO CD CD CO CO CD CD CO CO CD 0 Effective Rain in/hr Loss Rate in/hr Max 1 Low _ 0.045 0.030 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.140 0.138 CO CO 0.134 0.133 0.132 0.132 0.131 0.131 Storm Rain in/hr CO LO 0.053 0.035 0.035 0.035 0.035 0.035 LO LO RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 11.70 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 9.48 UNIT TIME -PERCENT OF LAG 158% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) ) 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 CO OD OD OD 93 94 01 01 BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: EXISTING BASIN BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 438 0 0 21,900 0 0 0.00 439 1 1 5,400 27,300 24,550 24,550 0.56 440 1 2 4,105 31,405 29,329 53,879 1.24 441 1 3 5,380 36,785 34,060 87,939 2.02 442 1 4 4,400 41,185 38,964 126,903 2.91 WHERE: V= l7Ei—E2 Ai+Az+AiA2) 3 Basin Volume Worksheet Page 13 of 13 0.021 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER January 26, 2021 DLS CORAL MOUNTAIN 2553 EXISTING BASIN OFF-SITE SOUTH 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 9 B PAVING/HARDSCAPE LANDSCAPING LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (Storm Events > 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR BASIN CHARACTERISTICS: PERCOLATION RATE (in/hr) DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION ACRES 4.014 1.687 4,250 ft 2,125 ft 490.9 ft 440.7 ft 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 in ELEVATION AMC 11 LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT D 56 0.51 1.00 D 56 0.51 0.10 AREA 436.0 ft 30,335 sf 437.0 ft 37,775 sf 438.0 ft 42,190 sf 439.0 ft 45,895 sf 440.0 ft 49,625 sf 441.0 ft 54,215 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD rF VIDGOLCAU GVA] °�. G]ML1°, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 PHYSICAL DATA RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) [1] CONCENTRATION POINT 44,287 10,683 EXISTING BASIN [2] AREA DESIGNATION EFFECTIVE RAIN (in) OFF-SITE SOUTH [3] AREA - ACRES 1.74 5.701 [4] L -FEET 26,215 0.60 4250 [5] L -MILES 40,668 0.93 0.805 [6] La -FEET 25,738 0.59 8.46 2125.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.402 [8] ELEVATION OF HEADWATER n/a 490.9 [9] ELEVATION OF CONCENTRATION POINT 2.59 440.7 [10] H -FEET 436.76 0.76 50.2 [11] S-FEET/MILE LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 62.4 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 7.90 [13] L"LCA/S^0.5 0.041 [14] AVERAGE MANNINGS 'N' ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.02 [15] LAG TIME -HOURS 0.7 0.14 [16] LAG TIME -MINUTES 8.6 [17] 100% OF LAG -MINUTES 8.6 [18] 200% OF LAG -MINUTES 17.1 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 FROM NOAA ATLAS 14 [3] STORM DURATION: Point Rain 1 -HOUR 1.44 in 3 -HOUR 2.14 in 6 -HOUR 2.76 in 24-HOUR 4.41 in STORM EVENT SUMMARY STORM DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR RAINFALL VOLUME (cu -ft) SOIL LOSSES (cu -ft) 29,800 3,585 44,287 10,683 57,117 21,044 91,264 50,595 EFFECTIVE RAIN (in) 1.27 1.62 1.74 1.97 FLOOD VOLUME (cu -ft) (acre -ft) 26,215 0.60 33,604 0.77 36,073 0.83 40,668 0.93 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 23,515 0.54 9.25 25,738 0.59 8.46 23,414 0.54 9.29 16,515 0.38 13.18 STORAGE PROVIDED (cu -ft) (acre -ft) 217,630 5.00 PEAK FLOW (cfs) n/a 11.11 9.67 2.59 MAXIMUM WSEL (ft) DEPTH (ft) 436.69 0.69 436.76 0.76 436.69 0.69 436.49 0.49 LOWEST FLOWLINE ELEVATION DIFFERENCE (ft) 1 1 LOWEST PAD ELEVATION DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 0.4 0.5 0.7 1.0 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 13 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE: 1/26/21 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0704 0.2426 M M O -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00160 (24-(T/60))^1.55 + 0.09 in/hr Undeveloped Condition: Low Loss = 90% II L H H � o 3 fa J 11 J C H 2 E� m O3 y m U 0E yai N .. > 'R U100' N CO al > y G m LL 0 LOW LOSS RATE PER RCFC/2322 0.1000 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0359 0.1373 0.1732 1 AREA WEIGHTED AVERAGE 0.704 0.296 CO a w cC a 4.014 1.687 o ui SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 00 oo0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] o o RI NUMBER [Plate E-6.1] CO m (0 I LAND USE PAVING/HARDSCAPE LANDSCAPING RCFC & WCD CzlUff IDGfiOOdOg37 fn SOIL GROUP [Plate C-1] CO CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J W N 01 436.02 436.04 436.06 436.09 01LO mm (0(0 436.19 436.25 436.35 436.63 436.67 436.69 ( 0 ( C C ,- M 0 0 0 0 N r 0 0 0 0 0.09 0.12 0.15 0.19 0.27 0.49 0.53 0.54 N F Oi B 562 1,302 2,100 2,957 M m m O pile 6,470 8,362 11,738 21,476 cow m N N N Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 212 213 214 215 217 219 0) 7 N N N N 229 244 246 247 212 213 214 215 217 219 221 224 229 244 246 247 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 30,504 30,667 30,842 31,029 M CO 7 N R M M 31,800 32,214 32,955 35,090 35,408 35,537 Basin Volume cu -ft 774 1,515 .N N- CO .- N M 4,148 5,301 a- )O 0) 03 (O( 66 11,967 21,720 23,174 23,762 U) E 5.1-m c O U > r• u) r O 1,012 1,072 1,191 1,370 1,608 2,115 3,605 9,982 1,698 834 Flood Hydrograph Flow cfs 2.58 3.18 3.37 3.57 3.97 4.57 5.36 7.05 O N N N W N N U) = U't )p w ce g W 0.45 0.55 O N In coOr O O O O O O 0.93 1.23 O O OI-- N O 0.98 0.48 Loss Rate in/hr Max 1 Low 0.53 0.62 m m r 00000,- m W m O 1.92 5.07 OON O O 0.17 0.17 0.17 0.17 0.17 0.17 0.17 0.17 0.17 0.17 0.17 0.17 Storm Rain in/hr 0.62 0.73 r (.0 O O 0)) O O — a N m N (() 7 00 , 0 RCFC & WCD FIVDG011 Ctrl UAILIAML DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 58.4 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.17 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) CO N M4 4.4 4.6 O CO 0)10 6.4 8.1 13.1 34.5 I,- CO 000 Time Minutes Hours 0.08 0.17 00') NM 0 0 0.42 0.50 0 N. m m 0 0 NMN n W 0 0 O m O 0 N0'NNM 35 40 45 50 55 60 Unit Time Period — N M V l0 0 r 0 m 0- N C C 5 C (0(0 a( 0I) C C U u?UE } U 0 N 0 0 O 0 (O ^ U • O W (0)0(400 • c9f8 6,1 0.4-2N8 22 N M N N NN 7 7 N W 2 7 J 0 O r O Q O O J 0 LL W W W Z C9 0 W Z W W* Q 1- O O 1 LL Qwix O (0Q77(g10 �ZW U K Q O>O>O> Wwtwo<CQQJ W <Z J WOO= Y Q M U 0 <OWJJWL,(L'JO> PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm C J 1J 10 CO!co CO 436.00 436.00 436.00 436.01 436.01 436.02 436.03 436.03 436.04 436.05 436.05 436.06 436.07 436.09 436.10 436.11 co n 0 0 coco 0 0 436.17 436.19 N 'Cr 6 0 co 0 0 436.26 436.29 436.31 5 0 ; C 7175 N 0 0 0 0 0 0 0 0 0 0 0 0.01 0.02 0.02 0.03 0.03 0.04 0.04 0.05 (0 n 0 O O O 0.08 0.09 0 CV 0 0 CO 10N. 10) N. 0 0 0 N. 0 0 0.20 0.22 0.24 O m C ( 1 U ON 109 263 417 703 857 1,142 1,427 1,580 1,776 2,060 N00010 N 0 N (V• 4 0 M M CO t00 (0 0 N (O 7,285 8,136 0))00 a0 1� a0 m 66 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft N N 211 211 N N N N N CO N N 213 213 0 0 N N 215 216 216 217 218 219 O N N N N N M N N N N 225 226 227 N N N N N N N N N CO N N CO CO N N 214 214 215 216 216 217 218 219 O N N N N 222 223 225 226 227 30,396 30,410 30,405 30,439 r M a 11) O O M co 30,569 30,632 30,694 30,728 30,771 30,833 M M CO O O— co M 31,135 31,217 31,356 31,504 31,624 31,772 31,978 32,165 M 0 0)) CO 0 N N co M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM a) •w E V N J > com ; U 277 343 320 474 0 LO N O 0 1,069 1,355 1,641 1,793 1,989 2,274 2,736 3,196 3,656 4,027 4,663 5,342 CO 10 OOD ,X) 10 (O 7,507 8,359 9,121 9,927 10,775 a) E 5 C j O U > 277 277 188 366 366 498 366 498 498 366 410 498 CD CD h I. (0 (D 676 587 853 897 764 897 1,163 1,074 986 1,030 1,074 Flood Hydrograph Flow cfs NN 0 0 O O MNN(O 0 N O T- N 0 T- T- N(0 N 0 T- T- (ON 0 N T- T- I,- O M 0 T- T- 101010 N N N N (0 N0. N 1 2.84 2.99 2.55 2.99 OD CO 0 117 M M 3.29 3.43 3.58 Effective Rain in/hr N� 0 0 NN 0 0 NNN 0 0 N 0 0 0.29 0.21 0.24 0.29 0.39 0.39 0.39 0.34 0.49 0.52 0.44 0.52 000 (0(0(0(O O O N O O O Loss Rate in/hr Max 1 Low co a0 N N O O 0 M N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 10 0 CO CO O O co 00 Cr 0 O O 0.48 0.44 N- 0) 10 11a 0 0 N 0) O 11a 0 0 N CO x 0 0 0 CO 117 OD 0 0 0 0 0 0 O O O O O O O O O O O O O O O O O O O O O O O O O Storm Rain in/hr MM O O 0.28 0.39 0.39 0.46 0.39 0.46 0 M O O 0.41 0.46 0.56 0.56 0.56 0.51 CO CD O O (NO(O O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 58.4 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.17 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) M M N T- 7 10 I- T- 1.5 1.8 1.5 _ 1.8 1.8 1.5 (O 0 I- T- 2.2 2.2 2.2 2.0 c0 r N N V r N N M M (0 2.9 3.0 3.1 Time Minutes Hours 0.08 0.17 N CO OO 0.42 0.50 0.58 0.67 0.75 0.83 DN) O O','' CO 7 N CO ' 1.42 1.50 1.58 1.67 r CO N 1.92 2.00 2.08 5 10 15 20 N M 35 40 45 50 55 60 (OO On 75 80 W 0) O C CD _ 105 110 _ 115 120 125 Unit Time Period N CO 10 (D N. 00 0 N C,2 MI. 15 16 N. CO 19 20 21 22 CO N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm 0 J W co com 436_35 436.40 43643 436.50 436.58 436.67 436_73 436.74 436_75 436.76 436.75 5 U t6 C (71 N 0.27 0.31 0.33 0.39 0.45 0.52 0.57 0.58 0.59 0.59 0.59 Om N C 1) U 11,880 13,564 14,582 17,058 19,751 22,838 24,903 25,241 25,489 25,738 25,528 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 229 232 233 237 241 246 249 249 250 250 250 229 232 233 237 241 246 249 249 250 250 250 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 32,986 33,355 33,578 34,121 CO CO r-- co a 10 M co ,- 10 a ,- GOO) 0710 M co 35,969 36,024 35,978 C U N E t mU 12,109 13,796 N 10 0) co ,-,- N VN 0) ,-N> 0 N N 25,739 25,988 25,777 2 C 0 U CO )1O O) , 1,251 2,713 a co 0)co M N M a co W (V 498 498 40 Flood Hydrograph Flow cfs 5.20 6.39 r- V CD voioi''''nT-T-T-O co r f0 n 0) (O f0 Co (o Effective Rain in/hr CD Tm O 0.73 1.57 1.70 1.93 M. a M co .- O 0.29 0.29 0.02 Loss Rate in/hr Max 1 Low N 0) 0) o O Nm CO N r V O Nm.- 0) 0) h r 1.29 0.44 0) 0) CO co co 0 0 0 r r r r r r r r r r N- Storm Rain in/hr 1010 0 N - T- 0.90 1.75 r ,- W T N 1.52 0.51 0.46 0.46 0.15 RCFC & WCD G/lAL1°- IMNJCQd DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 58.4 TOTAL ADJUSTED STORM RAIN (in) 2.14 CONSTANT LOSS RATE (in/hr) 0.17 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 4.2 5.0 3.5 6.8 MN N.: co 5.9 2.0 CO CO CO ,_,_O Time Minutes Hours N. N N N CO V N N 2.50 2.58 2.67 2.75 CO m 0 N N CM o 10 CO M 140 145 150 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 N CO CO CO 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 5 5 5 C U U C 0 U U U t U 3 g_ W co co.Nr p 0) co r � 0 N N c0 n c0 "I r M O co N. O . M 0 0 a a M N co 4 W 1— z 0 LU LU w~ 00 Lu Z W W O O Q 0 O O 7 10 Z W �Jc0>OOWWw0Omw LL�O ��2iL1 C7 Z _ _ w 0�L W0 u- I COW W W acc 2o_ < PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J W al COm 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 I 436.00 Total In Basin cu -ft ac -ft 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 0 0 O O 0 0 O O O O O O O O O O O O O O O O O O O O O O 0 7 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 43 44 44 44 44 101 O O 101 101 101 158 158 158 158 158 158 158 158 158 158 158 maim 211 -.:1 N -.:1 N c c c c c c c T.:, N T.:, N 0 0 0 0 0 0 2 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 7 (D 'Cr 7 M M 0 0 M M N 0 'Cr 7 M M 0 0 M M N r 7 0 M M 0 0 M M 30,357 30,357 30,357 30,357 30,357 30,370 30,370 30,370 30,370 30,370 30,370 _ 30,370 30,370 _ 30,370 30,370 _ 30,370 30,370 f 30,382 Basin Volume cu -ft co 7 7 7 7 7 7 7 44 - 101 101 101 101 - 101 CO Om Tm 158 158 158 158 158 158 158 158 158 158 215 N EO C U > , 7 7 7 7 7 7 7 7 0 7 0 0 0 0 0 )1") co O ..0 Lq co O ..0 Lq co O (n LO moo In LO moo In LO O 0 In N Flood Hydrograph Flow cfs mr u') O O 0.15 0.15 0.15 0.34 7 7 COCO O O 7 7 COCO O O 0.34 0.53 (h (0 O LC) O O (h (0 LO LC) O O (h (0 (A LL) O O (h (0 LO LL) O O (h (0 LO LL) O O (h N in r O O U) C U '(p L 0 C W oM 0 0 0 06 0 000 0 0 O6 0 0 O6 0000000000 0 0 O6 0 0 O6 0 0 O6 0 0 O6 0 0 0 W 00)0) 0 0 0 0 0 0 0 0 0) 0) 0 0 0 0 0)N 0 T- 0 0 Loss Rate in/hr Max 1 Low I- Mm Mm O O r r Mm Mm O O r O Mm N O O O O 0 N O O O O 0 N O O O CO 0 N O O CO CO 0 N O O CO CO N N O O CO CO N N O O CO CO N N O O CO CO N N O O CO LO N N O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr Tm N O O 0.20 0.20 0.20 0.23 CO CO O O CO CO O O 0.23 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.30 RCFC & WCD C, UDG DEC)Z3l klatiMaL DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 58.4 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.17 LOW LOSS RATE - PERCENT 85.00% 0 C C 1))23 W U) 0 0 m 0 0(0 CIO (O (O CIO (O I- CIO n N- CIO nN- CIO nc0 0 O a0 c0 CIO a0 c0 CIO O c0 Ci CD O c0 Ci CD O c0 Ci CD O-6O) Ci Time Minutes Hours 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 N 0 0 O O 1.08 1.17 (n CO N co. 1.42 1.50 1.58 1.67 1.75 1.83 2.00 O 0) O Mm 0) O N COM 0) O COM 7 0) O 7 (D 0) O (n coO 0) O co(D f- 0) O0) r O O o0 0 0) 00 0 CD 00 0Lr' CD T- 0 Unit Time Period c- N CO 7 (D (D I"- CO O F N 13 14 15 16 17 18 0) N Tm NNN N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm y I I N CO 01 m 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 O O co O co co 7 7 436.01 436.01 436.02 436.02 436.03 436.03 436.04 436.05 436.06 436.07 436.08 436.09 O O co co V 7 Total In Basin cu -ft ac -ft 0 0 00000000000000000000000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 N CO 0 0 CO mr 0 0 10 10 0 0 (0 N- 0 0 CO 0) 0 0 O V O el N OO N M N 010) O a r N N O CO M O M V 0),00) h (0 O (O V (O O W.-.-.- N 0) CO (0 co co CO I- OOH O M N N (O (O I� N M N V T. N O M V Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft C a- N T N 211 211 211 211 211 211 211 211 211 211 211 212 N N N N M N N 213 214 V O N N 215 216 MEM 217 N N N N N N N N N N N N N N N 212 212 212 213 213 214 214 215 215 216 216 217 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C ....p CO O E y U Q 0 a N h CO MM 0 0 M M M 0110 CO CO MM 0 0 M M CO CO CO MM 0 0 M M 1,-(0 CO (0 MM 0 0 M M O 0 V V 0 0 M M CO N V V V 0 0 M M (() O 00 V V 0 0 M M (O N O M O O 0 0 M M 0 I� N 10 CO 0 0 M M V1,- W V CO I� 0 0 M M COI00 N O) CO 00 0 0 M M (0 co 0 N. 0) 0 0 M M co O I- (0 x— CV M M Basin Volume cu -ft N O O T- N O a N N N N CO N N M N N 237 241 302 364 425 486 547 665 783 901 1,075 1,307 1,595 1,883 IV N r... N O N N N N r 0)N 0) MOD N CO. CO mr V CO CO' V N E 5 o C ] O ) > c (f) co T N O (f) N N O (f) N N O O N N N N I� r N N N N n r N N N O n CO N CO O O CO CO CO CO I- V co V CO V O O 1l) O CO CO O O (0 O O O (O (0 N 0) I� N (O r- Flood Hydrograph Flow cfs CO N 10-rr 0 0 N N 0 0 N N rr 0 0 N N rr 0 0 )0) 0 0 0)0) 0 0 O 0)� 0 O O T- N 0) CO N V I r (O01 (O (O ON N 2.05 2.05 7 CO N V N N (1) ; C U 'Ip L m Q' C W 0)N O 6 O NN 6 O NN 6 O NN 6 O (0 (O 6 O (0 (O 6 O (00) 6 O O) 0) 6 0 N (00)0) N N 0 0 N N 0 0 NN M M 0 0 (O (00)N M M 0 0 M a 0 0 Loss Rate in/hr Max 1 Low CO O NN . O O O O N N O O O O N N O O O O N N O O 00 W N N O O 00 OO N N O O a0 N M O O COCOCOCO7 O O 0.34 _ 0.37 O) 0) O O N N V O O 0.45 _ 0.45 00 7 0 . O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr 0.26 0.30 000000010)010) M M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 0.33 0.36 CO (0 CO co O O 0.40 0.43 0.46 0.46 0.50 0.50 0.53 0.53 0.56 0.60 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 58.4 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.17 LOW LOSS RATE - PERCENT 85.00% 0) C C (1) d U W (pN o_ a a m K OO O) 0 0 00) 0 0 00) 0 0 00) 0 0 OOOOO' T- T- T- T- T- T- T- T- NM T- T- 01710 T- T- 0 T- T- (0(01. T- T- T- Time Minutes Hours 2.08 2.17 N CO N N 2.42 2.50 2.58 2.67 r CO N N 2.92 3.00 3.08 3.17 N CO M M 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00 4.08 4.17 O O N M T O O M 01 O O c O T O O O (O T O O (0 (. T O O r O T O O W 0) % O O 0) O 0101010101010101010101 O O O O O N O O N M O O M 01 O O 7 0 Unit Time Period N N N co 29 30 31 32 M M 35 36 M co 39 40 41 42 CO V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywalls Number 0 Drywall Percolation Rate 0.00 cfs 0.00 cfm C J ow OCO m 436.14 436.16 436.18 436.20 N N 0)0 COCO 0 7 436.27 436.29 M M ci 000 CO 7 7 M V CO CO 7 7 436.48 436.53 436.59 436.67 436.69 436.69 436.68 436.68 436.67 436.66 Total In Basin cu -ft ac -ft T- N_ 6666666666666666666666 0 u') r 0) CO NN 0 I, NN O CO COM r CO 00 0 CO u) mt 0 CO O CO CO In 0 N N If)0 CO CO v u) NrOW (o 00 7,412 8,204 O)Q) 10,799 11,756 N ,_,_ 16,215 18,076 NW- ON N 23,414 23,383 23,181 22,977 22,758 22,529 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft CO 0) N N O N N N N NM N N N N 0(0 N N N N r0) N N N N T. CO M M N N 00) M Cr, N N N (0 7 0 N N I. r 0 0 N N 0 (0 0 0 N N OD u) 0 0 N N CO 0) N N O N N N N NM N N N N u)0 N N N N N. 0)m- N N N N M CO N N CO 0) CO CO N N N01. V 0 N N N-0,00 0 0 N N 0 0 N N u) 0 0 N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 31,410 31,547 00)0 M M 32,006 32,180 COLO CO T. Mu) NN MM 32,749 32,959 M((00 Nu) MM (0(00(4(0 M0 O0rN 0)M M0 34,814 35,396 1.11 CO 00 MM In If) MM 35,463 _ 35,419 MM ui ui MM Basin Volume cu -ft 4,910 5,536 6,217 6,898 7,634 8,427 9,276 10,123 11,026 11,985 0 NO N1. (00 16,450 18,315 20,462 23,120 0 N 007N (0(0(0(0 N N N N N N 23,003 22,775 NE C j U W V I� 0 0 0 fn O 0NN0)ONI.0)000 101 0 fn T- 0 0 X N X.N CO X N 7 r X N W X n) CO 001 N N W 0 r N 7 co 7 V 0 T N Flood Hydrograph Flow cfs N 0 m . N N O O 0 0 M M 3.19 3.38 3.57 3.57 0 (0 r rn M M N.0 COv 7 u) CO O O 0 1� 0 r 0 m r 01 2.62 0.72 0 0 . . O O O) 0 O o . . O O U) > C U 'Ip € Q' C W c00) 0 0 0 0 NN 0 u) 0 0 20) 0 u) 0 0 NN 0 f0 0 0 O O 0 f0 0 0 IO N 0 0- 0 NN N 000 M 0 N 0- 0 0 MN 0 0 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low CO 0 u0 ) 66 0.59 0.59 0 0 f0 CV 666666 0 0 CO 00 f00 0 0 Or CO 0 0 0.87 1.01 O- CO .-.- 1.32 1.58 CO N 66 0.17 _ 0.14 0.08 0.06 rrrrrrrrrrrrrrrrrrrrrr 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr CO M0 f00 6666 O N.O 0.73 0.76 0.79 0.79 0.83 0.86 O T- ..-..-.- N M 1.56 1.85 COMCO0 O O 0.20 0.17 O� O 66 RCFC & WCD C, UDG DECO Z37 klatiMaL DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 58.4 TOTAL ADJUSTED STORM RAIN (in) 2.76 CONSTANT LOSS RATE (in/hr) 0.17 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 0)O N I� N N 2.2 2.3 00 N N 2.5 2.6 3.1 3.6 3.9 4.2 4.7 5.6 0)O) ,- O 0.6 0.5 MN 66 Time Minutes Hours 0(0 N M 0 0 N O 7 0 7 V (0 N- u) 0 7 V OO M I. 0 7 V N O Q) O 0 ui (0 N. O N - ui ui IO M N M ui ui N O 7 O ui ui (0 N- u) 0 ui ui IO M N. 0 ui ui N O 0 0 ui c i I0 0 000000)0)000404(00000000 04010404040401 10 0 10 0 10 0 N 10 0 N M 10 0 M M 10 0 M M 10 0 M M 10 0 M M 10 0 M M 10 0 M M Unit Time Period ION 53 54 55 56 57 58 0000 63 64 00(00 67 _ 68 (O0. rr EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 0 5 5 E C0 V C c0) V c0) V o t 0 0 r a 7 (0 7 (G n mr T- Mt ISM r f OO N'N N MO 00 7M u)0 (00N O MO N a) CO H z 0 W W W H 00 Z w w g g w w OO WOV07)co Z W ww§Jo)j>>w0mw wwnw30 OooZ JJ=¢ --LLWL0w O w O w w w W W 2 a i- Q PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J C W N $ (6 0] 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.01 436.02 436.03 436.02 I 436.02 436.03 Total In Basin cu -ft ac -ft O O OO . O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O N O O O O N N O O O . O O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 106 316 629 1,046 0) 1- M CO 7 N CO CO 0) Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 27 41 41 55 41 41 41 55 55 55 COO COO COO COO COO CO 82 96 CO 0 82 96 110 110 CV CV 137 137 CO 0 CV 318 333 COCO V V O 635 636 638 640 M CO M 0 CO 0 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 632 633 633 633 633 633 633 632 633 633 633 634 634 635 636 638 640 O) CO O) CO CO CO O CO O SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.09 C 0.00160 Low Loss Rate (percent) 85.00% R V 7 M CO O O co M 30,344 30,347 V 00 M CO O O co M 30,344 30,347 30,347 30,347 30,350 30,350 30,350 30,350 30,350 30,353 30,353 30,356 30,356 30,359 30,353 30,356 30,359 30,359 30,362 30,362 LO 000 CO CO O O co M CLO OO CO CO O O co M 30,338 30,361 30,405 30,408 30,431 30,454 30,497 30,543 30,612 30,704 30,659 30,616 30,677 Basin Volume cu -ft N V 41 55 V V 41 55 55 55 0 0 0 0 0 0 82 96 O O 82 96 110 110 M M I"- t` I, -O O CV 318 333 V CO V LL0O 741 952 1,267 1,686 co uO N COCO O V N LO Volume In cu -ft 27 41 41 55 41 41 41 55 55 55 O O 0 0 O O 0 0 O NO 0 0 82 96 O (A 82 96 O 0 T- CO CO 0) 0)(0(0(0(0 I� f` r O 0) CO CO M M M CO V M V V (O 741 846 952 1,057 N (0 O M V CO V 0) Flood Hydrograph Flow cfs 0.03 0.05 (O O O O O O 0.05 0.05 (O O O O O O CO O O O O O 0.08 0.08 0.08 0.08 0.08 0.09 Cr T- O r 0 0 T- N T- 0 0 0) T- O 0 0 0.12 0.12 0.14 0.14 0.15 0.15 (0 r O O 0.02 0.13 0.35 0.37 0.49 0.60 0.82 0.94 co r 0 .... co O) N 77 0 O 15 fC ,,1 K .0 W 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 co co 0 0 O O co co 0 0 O O O N 0 0 O O O O 0 0 O O O c- 0 O O 7 0 O O 0.18 0.20 O O) CO 0 0 T- O O O Loss Rate in/hr Max I Low O N CO O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O O CO O O 0.075 0.075 0.075 0.075 LO O O O 0 0 O (O O 0 0 0 (f) O O N 0 0 0.090 0.105 O O N N O O 0.135 0.135 O O (f) (O 0 0 O (O (f) co 0 0 O (O co T- 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 0 (O O N N O CO O O O 0.306 0.302 0.299 0.295 0.292 0.288 (n N CO CO N N O O 0.278 0.275 co I� CO N N 0 0 Ln O CO N N 0 0 CO N LO N N N 0 0 0.252 0.248 0.245 0.242 0.239 0.236 CO 0 CO CO N N O O 0.227 0.224 0.221 0.218 0.215 0.212 0.209 0.206 0.203 0.200 I� (O 0) O) O O N O) 0) CO O O 0.187 0.184 0) O CO 1` n O O O Storm Rain in/hr (0 CO CO N O O O O 0.053 0.071 CO CO (0 N O O O O 0.053 0.071 1` 1` O O O O 0.088 0.088 0.088 0.088 CO O CO O O O O 0.106 0.123 M N V O O 0.106 0.123 V V O O O) O) LO N O O O O r 1` O O O V r O) T- O O N O) N N N O O LO (0 O O N N O O 0.282 0.300 0.335 0.353 0.370 0.388 LO (0 CO O co (n N N CO O O O RCFC & WCD C;117D12C11,C U GAG°, aML°- d DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 175% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 0.2 0.3 0.3 0.4 CO CO 0 0 CO V 0 0 V V 0 0 0.5 0.5 0.5 0.5 LO CO O O CO (` O O 0.7 0.8 O 1. O O 0.8 0.8 02 O 0 0 O O T- T- O T- T- 1.2 1.3 LO. N T- T- CO. 1` T- T- O) O T- N c- N N N LO. O T- T- -N L') 0 2 0.25 0.50 O O N., O O T- 1.25 1.50 1.75 2.00 2.25 2.50 (0 O r O N M 3.25 3.50 (0 O r O M V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 (P O r O O 1— 7.25 7.50 I n O r O r O (n O N (0 O O 8.75 9.00 9.25 9.50 O O N- O) O N (C (0 O O Time Minutes 15 30 45 60 LO O O O 135 150 165 180 0) O N 225 240 255 270 285 300 (n O CO CO 345 360 375 390 405 420 435 450 465 480 495 510 525 540 555 570 585 600 (n O 0) O coMO Unit Time Period T- N M V (n O 1` CO CO C"- T- N T- T- M V T- T- 15 16 I� O T- T- 19 20 N N N CO V N N 25 26 27 28 29 30 N 0)0)0)0)CO CO 7 35 36 I,- O CO M 39 40 N M V 7 V N E N O w UJ to 0 O0 tts O )) = 0) V N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm 0 J W VI CO = CO 436.04 436.04 436.05 436.05 436.05 436.08 436.10 436.14 436.17 436.22 436.27 436.29 436.31 436.34 436.37 436.39 436.42 436.44 436.46 436.48 436.49 436.47 436.45 436.43 436.41 436.39 436.37 436.35 436.34 436.32 436.30 436.28 436.26 _ 436.24 436.22 436.21 436.19 436.17 436.15 436.13 436.11 436.10 436.08 Total In Basin cu -ft 1 ac -ft CO CO 0 0 O O 0.04 0.04 ni. CO O O 0 0 CO N- O r 0 0 CO N 0 0 0.21 0.22 0.24 0.26 0)(O N M O O 0.33 0.35 h CO CO O O 0.38 0.36 0.35 0.33 N0 CO CO O O 0.29 0.28 0.26 0.25 0.23 0.22 0 CO N 0 0 I. CO 0 0 O CO_ 0 0 N 0 .- 0 0 0) I. (O 0 0 0 0 0 0 0 0) N 7 0 CO_(0(0O 1,845 2,648 3,549 4,641 5,830 7,481 9,135 9,795 10,463 11,502 12,458 13,419 14,297 15,090 15,800 16,153 16,515 15,862 15,213 14,552 0) CO CO N 7 N CO O 11,389 10,760 CO (0 „ V d) 8,848 8,217 N 0 (00 00)) O 6,339 5,719 5,102 4,488 M V V COON (MO M M N Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O V V OD O 642 643 643 647 651 656 N 0) CO O CO O (- 0 I- O CO O 683 688 N O Cr) 0) CO O 700 704 707 709 711 708 705 702 0) OM 0) O) O O O O) 0) O O 687 684 O CO I- O O 675 673 OIC r (0 O(0 V 7 (O (0 O(0 658 655 M OI - (O () 4 - O(0 CO 640 641 642 643 643 647 651 656 N Ch CO O CO O I- 0 I- O CO O 683 688 N O Cr) 0) CO O 700 704 707 709 711 708 705 702 0) O 0) O)0) O O CO O 0) O O 687 684 O OI- O O 675 673 O I- r (0O(0 O(0 V 7 O(0 658 655 M O h - 0() 4 - O(0 CO SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.09 C 0.00160 Low Loss Rate (percent) 85.00% Percolation Area sf 30,740 30,786 30,835 30,846 30,880 31,056 31,255 31,495 31,756 32,119 32,483 32,628 32,775 33,003 V O N N 7 M M M M 33,618 33,793 33,949 34,026 34,106 33,962 33,819 33,674 33,530 33,392 33,254 33,118 32,979 32,840 32,702 32,562 32,420 32,281 32,146 32,008 O N O CO CO. h M CO 31,596 31,461 31,323 31,190 31,053 Basin Volume cu -ft 1,851 2,061 2,283 2,334 2,489 3,295 4,200 5,297 6,492 8,150 (0 (V h M 7 0V (O O V 0) � 1 13,149 14,116 14,997 15,794 16,507 16,862 17,226 16,570 15,917 15,254 14,593 13,963 CO N CO M h 12,076 11,444 10,815 10,174 9,523 8,889 8,271 7,643 7,003 6,380 5,760 5,143 CO0 CO (O 0) N M M Volume In cu -ft 928 850 863 694 798 1,449 1,553 1,748 1,851 2,319 2,331 1,339 r (O N CO I's 1,647 1,658 1,578 1,497 1,417 1,062 1,072 55 (O (O 7 41 68 co CO O O 55 55 (O (O 7 N. N 7 V) (0 7 N. N 7 V 7 N. N. N 7 N Flood Hydrograph Flow cfs 1.03 0.94 CO (� f�O . . c.:;'' 0 0 CO . Oi� 0 CO V ,_CD. 2.06 2.58 2.59 1.49 O N O0)O ,_,_,_,_,_,_ CO V COC (O O O 1.57 1.18 0) O O ,- 0 0.06 0.05 0.05 0.08 0.08 0.08 CO O 00 O 0 0.06 0.05 0.03 0.05 0.06 0.05 0.03 0.05 0.05 0.05 M (0 CO 000 . 0 0 O Effective Rain in/hr 0.18 0.16 l O O 0.15 _ 0.28 0.30 _ 0.34 M 7 O O 0.45 _ 0.26 N M O O 0.32 _ 0.32 M N O O N N O O 0.21 0.01 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max 1 Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 0V IO CO O O V 0 M O O 0.390 0.390 0.375 0.360 0.345 0.285 0.285 0.060 0.060 0.045 0.045 0.075 0.075 0.075 (0 0 (00 O O O O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 M 7 CO M O O O O O O 0.173 0.171 OO O O_ O O 0.163 0.161 0.158 0.156 0.154 0.151 0.149 0.147 0.145 0.142 0.140 0.138 0.136 0.134 0.132 0.130 0.128 0.126 0.124 0.122 0.120 0.118 I- (O y- a.-,- O O 0.113 0.112 OON- 0_ 0 0 (O4 0_ 0_ 0 0 N _0 0_ 0 0 7 O _0 001 0 0 co I- 0 0 0 0 0 0(07 0 O) 0) 0 0 0 0 0 0 Storm Rain in/hr CO CO CO CO O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N 0 CO CO O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 M n CO 0 O O N- CO 0 0 O O 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 N- CO 0 0 O O 0.035 0.053 0.053 0.053 M CO M 0 0 0 O O O RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 175% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) 2.0 1.9 0) I- N. co (O M N O CO N N 2.9 3.4 V CO M N CO N. N N 2.6 2.6 O,t N N 2.3 1.9 1.9 0.4 0.4 0.3 0.3 0.5 0.5 0.5 0.4 0.4 0.4 0.3 0.2 0.3 0.4 0.3 0.2 0.3 0.3 0.3 Cl CO N O O O 0 2 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O (O O N ci 7 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 O (O O N O O N 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 O CO O O N (O N N N Time Minutes (00 n O O 690 705 720 735 750 _ 765 780 795 810 825 840 855 870 _ 885 OO 0) CO 930 945 (00 LO 0) 0) 0) O 1020 1035 1050 1065 W 00) O 0 1110 1125 1140 1155 1170 1185 1200 1215 (0 0 (0On0O) l lCV CV Unit Time Period 44 45 46 47 48 49 50 51 N co (O 0 0 (0 (O 0 56 57 CO O) (O (O 0 O O N CO O O 64 65 CO I. O O CO 0) O 0 LL OL N M I. I-- 74 75 CO I. N. n CO O N- N- O CO 00 82 83 0 (O CO CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 1/26/21 Basin Percolation Rate 1.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm 0 J (0 = caW 436.06 436.04 436.02 436.01 436.00 436.00 436.00 436.00 436.00 436.00 CO 2� Total In Basin cu -ft 1 ac -ft 0.05 0.03 N 0 0.00 0.00 co 0.00 0.00 O O 0 0 O O 0 0 2,031 1,417 820 211 000000 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 644 641 01 239 27 CO M COCO I,- I,- N N 1` 1,- `O N N 644 641 O) CO 633 632 632 632 N N CO CO O CO CO CO O LO SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM VARIABLE LOSS RATE (AVG) IN/HR Fm = Minimum value on loss curve (in/hr) 0.09 C 0.00160 Low Loss Rate (percent) 85.00% Percolation Area sf 30,921 30,786 30,654 30,520 30,387 30,341 30,341 30,341 30,341 30,341 C N v m20U 2,675 2,059 1,458 847 239 27 N N N N Volume In cu -ft _ 41 27 r, I,- r, I,- V N N N N N N N Flood Hydrograph Flow cfs LO CO LO M M M M COMM 0000000000 0 0 0 0 0 0 0 0 0 0 Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 O O O O O O O O O O Loss Rate in/hr Max 1 Low 0.045 0.030 0.045 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.093 0.092 O) O0) O O W W O O 0.088 0.087 0.087 0.087 O O O O Storm Rain in/hr 0.053 0.035 0.053 0.035 0.035 0.035 0.035 0.035 M O 0 0 0 0 RCFC & WCD C,11ff IDGiCMOOfn1W 1!'Lu QNJV4:ILS DRAINAGE AREA -ACRES 5.70 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 8.56 UNIT TIME -PERCENT OF LAG 175% TOTAL ADJUSTED STORM RAIN (in) 4.41 Pattern Percent (Plate E-5.9) M N M N N N N N N N 0 0 0 0 0 0 0 0 0 0 02 21.75 22.00 22.25 22.50 22.75 23.00 23.25 23.50 23.75 24.00 Time Minutes 1305 1320 1335 1350 1365 1380 1395 1410 1425 1440 Unit Time Period 87 88 CO 010 0) 0)) 93 94 00) 00) >- 1ce < C U U C V V 1 U .E^ 7 g m6, MOO O OO O OE CV, O M O 07 O) OOVOMN.ON (n 7 co m W 2 7 J 0 > W O i- O X O 06 QZ OC%' QdOzO W W W ZW U0 Q Jj 0 Q W O ce WWOOQU ja W OW m0 Z W > Z f Jy>OOWWwQa H §Jii OW cOJm0 FZ• W�J�U FLL°2O W OOfigW gWQ • yu U. BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: EXISTING BASIN BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 436 0 0 30,335 0 0 0.00 437 1 1 7,440 37,775 33,987 33,987 0.78 438 1 2 4,415 42,190 39,962 73,949 1.70 439 1 3 3,705 45,895 44,030 117,979 2.71 440 1 4 3,730 49,625 47,748 165,727 3.80 441 1 5 4,590 54,215 51,903 217,630 5.00 WHERE: V= 17E1—E2 Al+Az+AiA2) 3 Basin Volume Worksheet Page 13 of 13 Coral Mountain Master Plan Hydrology Report Appendix G Riverside County Whitewater River Region WQMP Worksheets Whitewater Watershed Legend: Required Entries Calculated Cells BMP Design Volume, VBMP & Design Flow Rate QBMP (Rev. 06-2014) Company Name MSA Consulting, Inc Date County/City Case No. MOUNTAIN - MSA JOB #2553 January 26, 2021 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREA 'A' Enter the Area Tributary to this Feature (ATRIB) ATRIB = 162.745 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (ATNF) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 39.291 acres O.24 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.8581f3 - 0.78If2 + 0.774If + 0.04 CBMP = 0.19 Determine Design Storage Volume, VBMP Calculate Vu, the 80% Unit Storage Volume Vu = 0.40 x CBMP Calculate the design storage volume of the BMP, VBMP VBMP (ft3) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMP = 0.08 (in*ac)/ac 45,719 ft3 12(in/ft) BMP Design Flow Rate, QBMP QBMP = CBMP X I X ATRIB I = Design Rainfall Intensity, 0.2 in/hr Notes: QBMP = 6.30 ft3/s Whitewater Watershed Legend: Required Entries Calculated Cells BMP Design Volume, VBMP & Design Flow Rate QBMP (Rev. 06-2014) Company Name MSA Consulting, Inc Date County/City Case No. MOUNTAIN - MSA JOB #2553 January 26, 2021 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREA 'B' Enter the Area Tributary to this Feature (ATRIB) ATRIB = 41.586 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (ATNF) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 17.518 acres O.42 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.8581f3 - 0.78If2 + 0.774If + 0.04 CBMP = 0.29 Determine Design Storage Volume, VBMP Calculate Vu, the 80% Unit Storage Volume Vu = 0.40 x CBMP Calculate the design storage volume of the BMP, VBMP VBMP (ft3) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMP = 0.12 (in*ac)/ac 17,618 ft3 12(in/ft) BMP Design Flow Rate, QBMP QBMP = CBMP X I X ATRIB I = Design Rainfall Intensity, 0.2 in/hr Notes: QBMP = 2.43 ft3/s Whitewater Watershed Legend: Required Entries Calculated Cells BMP Design Volume, VBMP & Design Flow Rate QBMP (Rev. 06-2014) Company Name MSA Consulting, Inc Date County/City Case No. MOUNTAIN - MSA JOB #2553 January 26, 2021 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREAS 'C & 'F' Enter the Area Tributary to this Feature (ATRIB) ATRIB = 55.002 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (AIMP) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 17.771 acres 0.32 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.8581f3 - 0.78If2 + 0.774If + 0.04 CBMP = 0.24 Determine Design Storage Volume, VBMP Calculate Vu, the 80% Unit Storage Volume Vu = 0.40 x CBMP Calculate the design storage volume of the BMP, VBMP VBMP (ft3) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMP = 0.10 (in*ac)/ac 18,975 ft3 12(in/ft) BMP Design Flow Rate, QBMP QBMP = CBMP X I X ATRIB I = Design Rainfall Intensity, 0.2 in/hr Notes: QBMP = 2.61 ft3/s Whitewater Watershed Legend: Required Entries Calculated Cells BMP Design Volume, VBMP & Design Flow Rate QBMP (Rev. 06-2014) Company Name MSA Consulting, Inc Date County/City Case No. MOUNTAIN - MSA JOB #2553 January 26, 2021 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREA 'D' Enter the Area Tributary to this Feature (ATRIB) ATRIB = 28.403 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (ATNF) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 14.157 acres 0.50 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.8581f3 - 0.78If2 + 0.774If + 0.04 CBMP = 0.34 Determine Design Storage Volume, VBMP Calculate Vu, the 80% Unit Storage Volume Vu = 0.40 x CBMP Calculate the design storage volume of the BMP, VBMP VBMP (ft3) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMP = 0.14 (in*ac)/ac 13,950 ft3 12(in/ft) BMP Design Flow Rate, QBMP QBMP = CBMP X I X ATRIB I = Design Rainfall Intensity, 0.2 in/hr Notes: QBMP = 1.92 ft3/s Whitewater Watershed Legend: Required Entries Calculated Cells BMP Design Volume, VBMP & Design Flow Rate QBMP (Rev. 06-2014) Company Name MSA Consulting, Inc Date County/City Case No. MOUNTAIN - MSA JOB #2553 January 26, 2021 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREA 'E' Enter the Area Tributary to this Feature (ATRIB) ATRIB = 61.802 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (AIMP) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 19.059 acres 0.31 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.8581f3 - 0.78If2 + 0.774If + 0.04 CBMP = 0.23 Determine Design Storage Volume, VBMP Calculate Vu, the 80% Unit Storage Volume Vu = 0.40 x CBMP Calculate the design storage volume of the BMP, VBMP VBMP (ft3) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMP = 0.09 (in*ac)/ac 20,610 ft3 12(in/ft) BMP Design Flow Rate, QBMP QBMP = CBMP X I X ATRIB I = Design Rainfall Intensity, 0.2 in/hr Notes: QBMP = 2.84 ft3/s Whitewater Watershed Legend: Required Entries Calculated Cells BMP Design Volume, VBMP & Design Flow Rate QBMP (Rev. 06-2014) Company Name MSA Consulting, Inc Date County/City Case No. MOUNTAIN - MSA JOB #2553 January 26, 2021 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREAS 'G' Enter the Area Tributary to this Feature (ATRIB) ATRIB = 35.742 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (ATNF) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 10.635 acres 0.30 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.8581f3 - 0.78If2 + 0.774If + 0.04 CBMP = 0.22 Determine Design Storage Volume, VBMP Calculate Vu, the 80% Unit Storage Volume Vu = 0.40 x CBMP Calculate the design storage volume of the BMP, VBMP VBMP (ft3) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMP = 0.09 (in*ac)/ac 11,617 ft3 12(in/ft) BMP Design Flow Rate, QBMP QBMP = CBMP X I X ATRIB I = Design Rainfall Intensity, 0.2 in/hr Notes: QBMP = 1.60 ft3/s 35 Whitewater Watershed Legend: Required Entries Calculated Cells BMP Design Volume, VBMP & Design Flow Rate QBMP (Rev. 06-2014) Company Name MSA Consulting, Inc Date County/City Case No. MOUNTAIN - MSA JOB #2553 January 26, 2021 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREAS 'H' Enter the Area Tributary to this Feature (ATRIB) ATRIB = 7.118 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (AIMP) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 6.406 acres 0.90 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.8581f3 - 0.78If2 + 0.774If + 0.04 CBMP = 0.73 Determine Design Storage Volume, VBMP Calculate Vu, the 80% Unit Storage Volume Vu = 0.40 x CBMP Calculate the design storage volume of the BMP, VBMP VBMP (ft3) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMP = 0.29 (in*ac)/ac 7,547 ft3 12(in/ft) BMP Design Flow Rate, QBMP QBMP = CBMP X I X ATRIB I = Design Rainfall Intensity, 0.2 in/hr Notes: QBMP = 1.04 ft3/s 35 Whitewater Watershed Legend: Required Entries Calculated Cells BMP Design Volume, VBMP & Design Flow Rate QBMP (Rev. 06-2014) Company Name MSA Consulting, Inc Date County/City Case No. MOUNTAIN - MSA JOB #2553 January 26, 2021 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREAS 'I' Enter the Area Tributary to this Feature (ATRIB) ATRIB = 51.629 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (ATNF) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 15.164 acres 0.29 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.8581f3 - 0.78If2 + 0.774If + 0.04 CBMP = 0.22 Determine Design Storage Volume, VBMP Calculate Vu, the 80% Unit Storage Volume Vu = 0.40 x CBMP Calculate the design storage volume of the BMP, VBMP VBMP (ft3) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMP = 0.09 (in*ac)/ac 16,626 ft3 12(in/ft) BMP Design Flow Rate, QBMP QBMP = CBMP X I X ATRIB I = Design Rainfall Intensity, 0.2 in/hr Notes: QBMP = 2.29 ft3/s 35 Coral Mountain Master Plan Hydrology Report Appendix H Existing Topography Exhibit Synthetic Unit Hydrograph Exhibits 58th Avenue 1 Planning Area VIII Future Low Density Residential (3) mails 7 NO. 2 Planning Area VIII Future Low Density Residential (2) Planning Area VIII Density Residential (1) Planning Area VIII Future Low Density Residential (4) EXISTING BAS I The Beach Club Planni T e Farm illage Surf g Area IX esort (3) The Farm\) )) Planning Area VIII Future Low Density Residential (5) The Hotel Village 3 \\ o / o The Hotel -N , \ i \N N , 0 , N.N N, Village fr /A NNNN NNNN Pop -Up Village 5 Back of N se EXISTING LEVEE-' DIKE NO. 4 60th Avenue /›N 0' 200' 400' 600' 800' SCALE 1"=200' OCTOBER 2019 MSA CONSULTING, INC. > PLANNING > CIVIL ENGINEERING > LAND SURVEYING 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com CITY OF LA QUINTA TTM 37815 - C.M. WAVE DEVELOPMENT EXISTING TOPOGRAPHIC EXHIBIT DESIGN BY SHEET DLS DRAWN BY 1 OF DLS CHECK BY 1 MSR SHEETS 58th Avenue DA -H A=7.118 Planning Area VIII Future Low Density Residential (3) PROPOSED RETENTION FLOOD VOLUME 1.3 AC -FT STORAGE PROVIDED 1.4 AC -FT PROPOSED RETENTION FLOOD VOLUME 3.2 AC -FT STORAGE PROVIDED 3.4 AC -FT DA -OFF (N) A=11.704 EXISTING LEVEE DIKE NO. 2 DA -F A=44.811 Planning Area VIII Future Low Density Residential (2) DA -B L=2,000 A=41.586 DA -I A=51.629 Planning Area VIII Future Low Density Residential (4) PROPOSED LAKE & RETENTION OOD VOLUME 4.2 AC -FT STOR GE PROVIDED 6.7 AC -FT PROPOSED RETENTION FLOOD VOLUME 5.0 AC -FT STORAGE PROVIDED 5.1 AC -FT EXISTING RETENTION FLOOD VOLUME 1.4 AC -FT STORAGE PROVIDED 2.9 AC -FT EXISTING CATCH BASIN PROPOSED RETENTION FLOOD VOLUME 4.7 AC -FT STORAGE PROVIDED 5.4 AC -FT Pop -Up Village 1 The Beach Club 464.0 e Farm Planni Village Surf g Area IX esort (3) The Farm EXISTING RETENTION FLOOD VOLUME 0.9 AC -FT STORAGE PROVIDED 5.0 AC -FT EXISTING CATCH BASIN OPOSED LAKE & RETENTION LOOD VOLUME 3.1 AC -FT AGE PRO IED 8 AC Pop -Up Village 2 The Hotel Planning Area VIII Future Low Density Residential (5) Planning Area X Open Space PA IX Surf Resort (1) DA -E L=780 A=61.802 Coral Mountain LAND USE LEGEND DA -A1 L=1,18 A=88.41 Pop -Up Village 3 rea I (2) The Hotel PROPOSED & RETENTION FLOOD VOLUME 5.7 AC -FT STORAGE PROVIDED 27.9 AC -FT ROCK OUTCROPPING EXISTING OPEN BRUSH - POOR IMPERVIOUS (PAVING/HARDSCAPE) IMPERVIOUS (WATER FEATURE) COMMERCIAL SINGLE FAMILY RESIDENTIAL - LOW DENSITY SINGLE FAMILY RESIDENTIAL - MEDIUM DENSITY SINGLE FAMILY RESIDENTIAL - HIGH DENSITY OPEN SPACE (LANDSCAPE/RETENTION) 960.0 PROPOSED R DA -OFF (S) A=5.701 Pop -Up Village 4 DA -A3 L=1,050 A=24.968 Pop -Up Village 5 ack of House 490.9 EXISTING LEVEE DIKE NO. 4 HYDROLOGIC AREA RECONCILIATION ROCK OUT -OUTCROPPING EXISTING OPEN BRUSH - POOR IMPERVIOUS (STREETS/WALKS) IMPERVIOUS (WATER FEATURE) SFR - LOW DENSITY SFR - MEDIUM DENSITY SFR - HIGH DENSITY OPEN SPACE (LANDSCAPE) TOTAL ON-SITE HYDROLOGIC AREA OFF-SITE IMPERVIOUS (STREETS/WALKS) OPEN SPACE (LANDSCAPE) TOTAL OFF-SITE HYDROLOGIC AREA TOTAL HYDROLOGIC AREA SURVEY BOUNDARY AREA ADD: AREA SUBTRACT: TOTAL AREA - RECONCILED 35.652 35.233 11.552 27.445 193.047 4.092 22.208 95.642 444.027 9.768 5.701 17.405 461.432 384.389 77.080 0.037 461.432 AC AC AC AC AC AC AC AC AC AC AC AC AC AC AC OFF-SITE TRIBUTARY AC AC o' 200' 400' PRELIMINARY WQMP SUMMARY DRAINAGE AREA TOTAL AREA (acres) IMPERVIOUS AREA (acres) DESIGN VOLUME (cu -ft) DESIGN FLOW (cfs) STORAGE PROVIDED (cu -ft) DA -A 162.745 39.291 45,719 6.30 3,033,385 DA -B 41.586 17.518 17,618 2.43 292,016 DA -C & F 55.002 17.771 18,975 2.61 223,118 DA -D 28.403 14.157 13,950 1.92 168,719 DA -E 61.802 19.059 20,610 2.84 1,216,389 DA -G 35.742 10.635 11,617 1.60 147,099 DA -H 7.118 6.406 7,547 1.04 60,238 DA -I 51.629 15.164 16,626 2.29 237,233 600' 800' SCALE 1"=200' MSA CONSULTING, INC. > PLANNING > CIVIL ENGINEERING > LAND SURVEYING 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com XX L -XX A=XX LEGEND DRAINAGE DIRECTION TRIBUTARY DRAINAGE AREA BOUNDARY DRAINAGE SUB -AREA ID FLOW TRAVEL LENGTH (FT) AREA (AC) JANUARY 2021 CITY OF LA QUINTA TTM 37815 - CORAL MOUNTAIN RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD (SHORTCUT METHOD) DEVELOPED CONDITION HYDROLOGY EXHIBIT DESIGN BY DLS DRAWN BY DLS CHECK BY MSR SHEET 1 OF 2 SHEETS DRAINAGE AREA 'Al' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT ROCK OUT -CROPPING 34.384 93 0.09 5.0 EXISTING OPEN BRUSH 30.363 76 0.29 5.0 OPEN SPACE 23.665 56 0.51 10.0 TOTAL 88.412 7.64 STORM EVENT SUMMARY - 10 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 0.46 0.41 0.39 0.28 FLOOD VOLUME (cu -ft) (acre -ft) 147,065 3.38 130,384 2.99 126,548 2.91 90,475 2.08 STORAGE PROVIDED (cu -ft) (acre -ft) 154 781 3.55 PEAK FLOW (cfs) N/A 70.45 58.94 7.64 MAXIMUM WSEL (ft) DEPTH (ft) 460.83 1.83 460.50 1.50 460.29 1.29 459.27 0.27 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 459 0.0 65,765 0.00 0.00 460 1.0 77,310 71,460 1.64 461 2.0 89,480 154,781 3.55 DRAINAGE AREA 'A2' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC II INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 2.071 56 0.51 100.0 COMMERCIAL 5.752 56 0.51 90.0 RESIDENTIAL - HIGH DENSITY 8.141 56 0.51 50.0 OPEN SPACE 1.350 56 0.51 10.0 TOTAL 17.314 469.02 1.02 STORM EVENT SUMMARY - 10 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 0.50 0.55 0.73 1.06 FLOOD VOLUME (cu -ft) (acre -ft) 31,653 0.73 34,498 0.79 45,742 1.05 66,464 1.53 PEAK FLOW (cfs) N/A 14.61 12.35 2.19 DRAINAGE AREA 'A3' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC II INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT ROCK OUT -CROPPING 1.268 93 0.09 5.0 EXISTING OPEN BRUSH 4.879 76 0.29 5.0 STREETS/WALKS 0.011 56 0.51 100.0 OPEN SPACE 18.819 56 0.51 10.0 TOTAL 24.968 469.02 1.02 STORM EVENT SUMMARY - 10 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 0.73 0.29 0.30 0.36 FLOOD VOLUME (cu -ft) (acre -ft) 30,473 0.70 26,411 0.61 26,879 0.62 32,470 0.75 STORAGE PROVIDED (cu -ft) (acre -ft) 34,217 0.79 PEAK FLOW (cfs) N/A 15.98 12.73 1.23 MAXIMUM WSEL (ft) DEPTH (ft) 469.82 1.82 469.45 1.45 469.33 1.33 469.02 1.02 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 468 0.0 10,730 0.00 0.00 469 1.0 17,060 13,773 0.32 470 2.0 24,025 34,217 0.79 DRAINAGE AREA 'A' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC II INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT ROCK OUT -CROPPING 35.652 93 0.09 5.0 EXISTING OPEN BRUSH 35.233 76 0.29 5.0 STREETS/WALKS 2.082 56 0.51 100.0 WATER FEATURE 18.699 56 0.51 100.0 COMMERCIAL 5.752 56 0.51 90.0 RESIDENTIAL - HIGH DENSITY 8.141 56 0.51 50.0 OPEN SPACE 57.186 56 0.51 10.0 TOTAL 162.745 PEAK FLOW (cfs) STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.17 1.35 1.34 1.36 FLOOD VOLUME (cu -ft) (acre -ft) 693,659 15.92 799,746 18.36 789,971 18.14 803,730 18.45 STORAGE PROVIDED (cu -ft) (acre -ft) 3,178,217 72.96 PEAK FLOW (cfs) N/A 301.94 260.74 60.87 MAXIMUM WSEL (ft) DEPTH (ft) 452.09 1.09 452.26 1.26 452.24 1.24 452.26 1.26 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 451 0.0 548,486 0.00 0.00 456 1.0 726,985 3,178,217 72.96 DRAINAGE AREA 'B' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 2.581 56 0.51 100.0 WATER FEATURE 6.423 56 0.51 100.0 COMMERCIAL 1.483 56 0.51 90.0 RESIDENTIAL - LOW DENSITY 20.347 56 0.51 30.0 OPEN SPACE 10.759 56 0.51 10.0 TOTAL 41.586 262,250 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.12 1.21 1.20 1.10 FLOOD VOLUME (cu -ft) (acre -ft) 169,568 3.89 182,917 4.20 180,867 4.15 166,219 3.82 STORAGE PROVIDED (cu -ft) (acre -ft) 292 016 6.70 PEAK FLOW (cfs) N/A 75.02 64.49 13.72 MAXIMUM WSEL (ft) DEPTH (ft) 458.58 0.58 458.63 0.63 458.62 0.62 458.57 0.57 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 458 0.0 279,800 0.00 0.00 459 1.0 304,405 292,016 6.70 DRAINAGE AREA 'C' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 1.455 56 0.51 100.0 RESIDENTIAL - MEDIUM DENSITY 4.092 56 0.51 40.0 RESIDENTIAL - HIGH DENSITY 2.159 56 0.51 50.0 OPEN SPACE 2.485 56 0.51 10.0 TOTAL 10.191 56 DRAINAGE AREA 'F' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 0.353 56 0.51 100.0 RESIDENTIAL - LOW DENSITY 42.760 56 0.51 30.0 OPEN SPACE 1.698 56 0.51 10.0 TOTAL 44.811 56 DRAINAGE AREAS 'C' & 'F' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 1.808 56 0.51 100.0 RESIDENTIAL - MEDIUM DENSITY 4.092 56 0.51 40.0 RESIDENTIAL - HIGH DENSITY 2.159 56 0.51 50.0 RESIDENTIAL - LOW DENSITY 42.760 56 0.51 30.0 OPEN SPACE 4.183 56 0.51 10.0 TOTAL 55.002 262,250 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.08 1.10 1.10 0.99 FLOOD VOLUME (cu -ft) (acre -ft) 215,291 4.94 219,074 5.03 219,690 5.04 197,108 4.52 STORAGE PROVIDED (cu -ft) (acre -ft) 223 118 5.12 PEAK FLOW (cfs) N/A 96.73 82.80 15.99 MAXIMUM WSEL (ft) DEPTH (ft) 453.83 2.83 453.73 2.73 453.55 2.55 452.59 1.59 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 451 0.0 65,060 0.00 0.00 452 1.0 71,195 68,104 1.56 453 2.0 77,490 142,425 3.27 454 3.0 83,940 223,118 5.12 DRAINAGE AREA 'D' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 2.588 56 0.51 100.0 WATER FEATURE 2.323 56 0.51 100.0 COMMERCIAL 4.803 56 0.51 90.0 RESIDENTIAL - HIGH DENSITY 7.637 56 0.51 50.0 OPEN SPACE 11.052 56 0.51 10.0 TOTAL 28.403 262,250 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.16 1.31 1.28 1.28 FLOOD VOLUME (cu -ft) (acre -ft) 119,475 2.74 134,950 3.10 132,055 3.03 132,086 3.03 STORAGE PROVIDED (cu -ft) (acre -ft) 168 719 3.87 PEAK FLOW (cfs) N/A 52.25 45.06 3.03 MAXIMUM WSEL (ft) DEPTH (ft) 452.10 1.10 452.23 1.23 452.20 1.20 452.20 1.20 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 451 0.0 101,190 0.00 0.00 452 1.0 112,495 106,793 2.45 452.5 1.5 135,570 168,719 3.87 DRAINAGE AREA 'E' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 1.707 56 0.51 100.0 RESIDENTIAL - LOW DENSITY 48.170 56 0.51 30.0 RESIDENTIAL - HIGH DENSITY 4.271 56 0.51 50.0 OPEN SPACE 7.654 56 0.51 10.0 TOTAL 61.802 442.26 0.26 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.07 1.08 1.10 0.98 FLOOD VOLUME (cu -ft) (acre -ft) 240,394 5.52 242,121 5.56 246,363 5.66 219,473 5.04 STORAGE PROVIDED (cu -ft) (acre -ft) 1,216,389 27.92 PEAK FLOW (cfs) N/A 108.26 92.62 17.61 MAXIMUM WSEL (ft) DEPTH (ft) 442.97 0.97 442.85 0.85 442.76 0.76 442.26 0.26 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 442 0.0 224,555 0.00 0.00 443 1.0 231,980 228,257 5.24 444 2.0 239,460 463,968 10.65 445 3.0 247,000 707,188 16.23 446 4.0 254,595 957,976 21.99 447 5.0 262,250 1,216,389 27.92 DRAINAGE AREA 'G' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 0.316 56 0.51 100.0 RESIDENTIAL - LOW DENSITY 33.880 56 0.51 30.0 OPEN SPACE 1.546 56 0.51 10.0 TOTAL 35.742 10.03 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.07 1.07 1.09 0.96 FLOOD VOLUME (cu -ft) (acre -ft) 138,381 3.18 138,303 3.17 141,025 3.24 124,782 2.86 STORAGE PROVIDED (cu -ft) (acre -ft) 147 099 3.38 PEAK FLOW (cfs) N/A 62.43 53.39 10.03 MAXIMUM WSEL (ft) DEPTH (ft) 453.73 3.73 453.60 3.60 453.48 3.48 452.35 2.35 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 450 0.0 29,375 0.00 0.00 451 1.0 32,950 31,145 0.71 452 2.0 36,680 65,944 1.51 453 3.0 40,540 104,538 2.40 454 4.0 44,615 147,099 3.38 DRAINAGE AREA 'H' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT COMMERCIAL 7.118 56 0.51 90.0 TOTAL 7.118 34,704 0.80 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.34 1.85 2.18 2.61 FLOOD VOLUME (cu -ft) (acre -ft) 34,704 0.80 47,783 1.10 56,379 1.29 67,518 1.55 STORAGE PROVIDED (cu -ft) (acre -ft) 60,238 1.38 PEAK FLOW (cfs) N/A 14.42 12.62 3.71 MAXIMUM WSEL (ft) DEPTH (ft) 449.84 1.84 450.29 2.29 450.48 2.48 450.53 2.53 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 448 0.0 13,135 0.00 0.00 449 1.0 19,390 16,161 0.37 450 2.0 21,415 36,555 0.84 451 3.0 26,025 60,238 1.38 DRAINAGE AREA 'I' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT 438 STREETS/WALKS 0.470 56 0.51 100.0 RESIDENTIAL - LOW DENSITY 47.890 56 0.51 30.0 OPEN SPACE 3.269 56 0.51 10.0 TOTAL 51.629 170,480 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.06 1.06 1.08 0.96 FLOOD VOLUME (cu -ft) (acre -ft) 199,561 4.58 198,899 4.57 202,969 4.66 179,153 4.11 STORAGE PROVIDED (cu -ft) (acre -ft) 237 233 5.45 PEAK FLOW (cfs) N/A 90.09 77.02 14.41 MAXIMUM WSEL (ft) DEPTH (ft) 441.37 3.37 441.22 3.22 441.10 3.10 439.99 1.99 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 438 0.0 49,700 0.00 0.00 439 1.0 54,375 52,020 1.19 440 2.0 59,209 108,795 2.50 441 3.0 64,195 170,480 3.91 442 4.0 69,345 237,233 5.45 DRAINAGE AREA OFF-SITE NORTH PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 5.754 56 0.51 100.0 OPEN SPACE 5.950 56 0.51 10.0 TOTAL 11.704 126 903 2.91 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.18 1.37 1.32 1.39 FLOOD VOLUME (cu -ft) (acre -ft) 50,090 1.15 58,112 1.33 55,916 1.28 59,063 1.36 STORAGE PROVIDED (cu -ft) (acre -ft) 126 903 2.91 PEAK FLOW (cfs) N/A 21.77 18.81 4.43 MAXIMUM WSEL (ft) DEPTH (ft) 439.80 1.80 439.93 1.93 439.77 1.77 439.35 1.35 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 438 0.0 21,900 0.00 0.00 439 1.0 27,300 24,550 0.56 440 2.0 31,405 53,879 1.24 441 3.0 36,785 87,939 2.02 442 4.0 41,185 126,903 2.91 DRAINAGE AREA OFF-SITE SOUTH PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT STREETS/WALKS 4.014 56 0.51 100.0 OPEN SPACE 1.687 56 0.51 10.0 TOTAL 5.701 217 630 5.00 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.27 1.62 1.74 1.97 FLOOD VOLUME (cu -ft) (acre -ft) 26,215 0.60 33,604 0.77 36,073 0.83 40,668 0.93 STORAGE PROVIDED (cu -ft) (acre -ft) 217 630 5.00 PEAK FLOW (cfs) N/A 11.11 9.67 2.59 MAXIMUM WSEL (ft) DEPTH (ft) 436.69 0.69 436.76 0.76 436.69 0.69 436.49 0.49 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 436 0.0 30,335 0.00 0.00 437 1.0 37,775 33,987 0.78 438 2.0 42,190 73,949 1.70 439 3.0 45,895 117,979 2.71 440 4.0 49,625 165,727 3.80 441 5.0 54,215 217,630 5.00 MSA CONSULTING, INC. > PLANNING > CIVIL ENGINEERING > LAND SURVEYING 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com JANUARY 2021 CITY OF LA QUINTA TTM 37815 - CORAL MOUNTAIN PROPOSED LAND USE, FLOOD VOLUME AND BASIN VOLUME SUMMARIES DESIGN BY DLS DRAWN BY DLS CHECK BY MSR SHEET 2 OF 2 SHEETS