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Appendix J.1 - Preliminary Hydrology ReportCORAL MOUNTAIN RESORT DRAFT EIR SCH# 2021020310 TECHNICAL APPENDICES Preliminary Hydrology Report Appendix J.1 June 2021 PRELIMINARY HYDROLOGY REPORT For Property Located In A Portion of Sections 27 & 28, Township 6 South, Range 7 East, SBM La Quinta, California CORAL MOUNTAIN Tentative Tract Map 37815 May, 2020 Prepared for: CM Wave Development, L.L.C. 2440 Junction Place, Suite 200 Boulder, CO 80301 JN: 2553 MSA CONSULTING, INC > PLANNING > CIVIL ENGINEERING > LAND SURVEYIN 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com PRELIMINARY HYDROLOGY REPORT For Property Located In A Portion of Sections 27 & 28, Township 6 South, Range 7 East, SBM La Quinta, California CORAL MOUNTAIN Tentative Tract Map 37815 May, 2020 Prepared for: CM Wave Development, L.L.C. 2440 Junction Place, Suite 200 Boulder, CO 80301 JN: 2553 MSA CONSULTING, INC > PLANNING > CIVIL ENGINEERING > LAND SURVEYIN 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com Coral Mountain Preliminary 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 Area 'C' 3 Drainage Area 'D' 3 Drainage Area 'E' 3 Drainage Area 'F' 3 Drainage Area 'G' 4 Drainage Area 'H' 4 Drainage Area 'I' 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 Preliminary 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 preliminary 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 Preliminary 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 Preliminary 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 73 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. Drainage Area 'C' Storm runoff (roughly 1 acre-foot) for this drainage area will be conveyed to and retained in a temporary retention basin located in Drainage Area 'F'. 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". Drainage Area 'E' Storm runoff of approximately 5.7 acre-feet for this drainage area will be conveyed to and retained in a a large basin located in along the southerly portion of Planning Area VIII (Area 5). This basin will also provide a discharge location for the lagoon. Drainage Area 'F' This area is a future low-density residential development. Once developed it is anticipated approximately 4.0 acre-feet of retention will be required in addition to the 1 acre-foot basin required for Drainage Area 'C'. 3 Coral Mountain Preliminary Hydrology Report Drainage Area 'G' This area is a future low-density residential development. Once developed it is anticipated approximately 3.2 acre-feet of retention will be required. Drainage Area 'H' This area is a future commercial development. Once developed it is anticipated approximately 1.6 acre-feet of retention will be required. 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. 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 'I' is developed. 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. 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 Preliminary Hydrology Report Appendix A Riverside County TLMA Vicinity Map Coral Mountain Preliminary Hydrology Report Appendix B NFIP Flood Insurance Rate Map w C) w J SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT pth Zone AE, AO, AH Regulatory Floodway gn Ow Oa J a� 0a W N as U) Area with Flood Risk due to Leveezooe O lig U. O a' Q N W a 2 ao LUO W O LL 0 O Area of Minimal Flood Hazard D OTHER AREAS Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall J IX d' W W U 0 77, - Profile Baseline Hydrographic Feature Digital Data Available No Digital Data Available MAP PANELS 116°14'40.70"W 33°36'19.61"N 33°36'49.57"N O O O w 0) w J SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT 33°37'53.05"N pth Zone AE, AO, AH Regulatory Floodway OW Oa J a� W N as U) Area with Flood Risk due to Leveezooe O U. O a' N W a 2 a � W O LL O 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 O Q D y o. L j N Z 3 O. O O T 'O (6 O L O y O. y y= N i ( w �n U O _ O. U t O (p f6 . O E N 2 R O d v~£ E E N m FD-6mF06 Ul N U O at+ N N V O Eq d' £ Oq H 'O H N H N i F H N d Li i 116°14'40.22"W 33°37'23.10"N O O O N O O O O N O SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT 33°37'35.63"N Regulatory Floodway 0 W oa J Q� W N aQ lig LL 0 x N N W < CCx < 0 W 0 x0. 0 0 f0 N O 2 0 O LL 7012 £ g C R i ¢ `w 0 K U z Area of Undetermined Flood Hazard OTHER AREAS Channel, Culvert, or Storm Sewer Levee, Dike, or Floodwall J c/) 2 2 W M W U CC Hydrographic Feature z Digital Data Available No Digital Data Available N R i £ O o � m—. O c 2 E ° ma cC 0 Y m NNd 0 OprO£QYL~p N ON3Na £ • pNc ayill' 836 daaE� y L0 0 £TW p L OQ `N5 .S2?- d O N 133641 y >, O' cry NL > NL £ ¢ >. a> O O ._+ d Q N O R O V .- y L i 2 N - a+ E o V a0.. 4>e C V O N d'O O •- > N L 0. 0 Q. E N Q� •U 0 o N C y cc'm YYo £a�y�> t 0= i .r 2 3 c4 £ d L H O. c6 H •y i 0 O J m O C d O. O H V O Z o y= I, LI o.Om;a O>mc"a V O£ N L c6 Z 0 O. O N >. V c6 O L d �_ mw�� _°o=au�m £ica2 ,�`odv N= 3 L y N N 0 H v H co c9 £ a O. -O MAP PANELS 116°14'39.62"W Coral Mountain Preliminary Hydrology Report Appendix C USDA NCSS Hydrologic Soils Map 33° 3756" N 33° 36' 28" N 8 8 568100 Hydrologic Soil Group—Riverside County, Coachella Valley Area, California (THE WAVE) 568400 568700 569000 569300 ,59600 569900 8 Vint ORO Soil Map may not be valid at this scale. 568100 I I I I I I 568400 568700 569000 569300 569600 565900 Map Scale: 1:13,200 if printed on A portrait (8.5" x 11") sheet. efAN 0 150 300 600 Meters 900 A\ Feet 0 500 1000 2000 3000 Map projection: Web Mercator Comer coordinates: WG584 Edge tics: UTM Zone 11N WGS84 USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 8 lV 8 g 8 0) 9/18/2019 Page 1 of 4 33° 37 56" N 33° 36'28" N E 0 .o U To ° (o T.) L U (0 O rij oW U= a) 0 3 O 0 U U 0) 0 2 a 2 MAP INFORMATION MAP LEGEND (0 a 0) a E 0) a) 0 O 0) N 0. E roO U .L. > ° cno 00 y o Warning: Soil Map may not be valid at this scale. a ° 'o1>2 (I' '@ co ° D c UO 0) i) U ccry E O) U N (0 a (0 E f9 ° 3 O c _c o•Q 0 �0 a° c U (0 L 0) E o L-' O C > - o o L E cy> a n� c sZ — CO O y E o O N E C N oacciN asE c E ° � 'c co (0 14 ai a) c - c O W E_ ai m U (0 0 U U 0 Not rated or not available ❑ ❑ 0 0 Soil Rating Polygons c (0 0 (0 = N a) coN O co O ° (0 co w :o 2 m (d ° m r°° a a 3 c o a U U O Q N O co 0 c co E O ) 0 y (co n >a) a w a Q — U N p cc >> N a N v > co M 'O (0 E m LO L°. ° f0 (A is Cn cy (0 a y • L L (O7 c 0 N 0) Ce a0 0 Q y .L°„ .: C to N 0 O ZL N Z U O N F) E Na ° c ma °� (° Q o 3 ii o m> co �j w cmEOE U r c t 3Lma) L y . c a� (6 D w O- a) N o °QL (0 o U @ c 0 a) • 7 N a) a= (6 c O 0)) >' c V .. O U O O. 0 CUO E ., co E ° 0 a ° N p Q N c .y0.. Q N E II N n O cN � Q ND a NQ O > 05 Q ct w Q° C ° y i6 so N ° O N_ O L L U L >' > L N aI (6 (0 f0 CO aI E co O O) >, 3 oc m 3Cn y 3a co y o Q .co o oa Qm >E 2 °- E c m Tx,0 c•E CD a- co a o a> nma E ,_ 0) °'o c o O° m° o° Q ao (0N. tc o w U L �0 > ° >, E O �' tT ° 7 U 'd U c a O O a) c (0 0 O Q 0 Q N (0 a) c (0 -c Cn ° O :: N a°) E (00 CD E io50 M o.6 m H o 0)0i 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 Preliminary 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 0.856 (0.543-0.947) (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 (1.39-2.43) 1 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 1 (2.10-3.66) 3.32 (2.46-4.54) 4.21 (2.98-6.00) 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 (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) 6.04 1 (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 2.52 3.26 4.36 5.28 6.28 (0.961-1.25) (1.48-1.93) (2.22-2.91) (2.85-3.80) (3.69-5.25) (4.38-6.48) (5.09-7.90) 7.38 9.01 (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 (5.59-8.66) 8.09 , (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 (6.12-9.50) 8.86 (6.99-11.4) 10.7 (8.16-14.5) 12.3 (9.04-17.1) 45 -day 1.34 2.15 3.32 4.35 5.88 7.14 8.49 (1.19-1.55) (1.90-2.49) (2.93-3.85) (3.81-5.08) (4.98-7.08) (5.93-8.77) (6.89-10.7) 9.96 12.1 (7.87-12.9) (9.16-16.2) 13.8 (10.1-19.2) 60 -day 1.42 2.31 3.60 4.73 6.40 7.78 9.27 (1.26-1.64) (2.04-2.67) (3.17-4.17) (4.14-5.52) (5.42-7.71) (6.46-9.56) (7.52-11.7) I 10.9 13.2 15.0 (8.58-14.0) (9.98-17.7) (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 H W W 2 N J LL LL Z Lu CI)Q C 0 0Z ❑ Z H O) 22 LL Z_ 0 w W W LL to Z Q ~ F LLINO(0Z_ w Z = 0 m W < W m J 2 2 H < < z F F W w w tt O 000 Z aaaio C LO O O co 0) 7 CO 7 7 N L 0) LO CO O 7 T C V P] N N O O LO O O O co (fl CV (O N I n (l7 J LL O J m Q F N W N CO N 0 CO LO N co V 0 (0 co co O V W co r u) Q LLLL CV (0r COO) OO,- N NM V V 41LO (.0 CO N- N.- N- CO CO 01 W IX Z W v 0 0 0 0 0 2 0 rG w r LL == Jr_ y LL LL Q m W LO CO CO (O M N V CO O V W (0 0 n CO O r l0 N O CO W ¢ g LLZ=047 co V N C, N., (JD. u) V V MNN N7 7 ,- 00000) J Z W S US OS N N N N O >00 �zv >- Et Et F LL LL N Z Z CO W Z QwOfnOf0Ofnou)ou)Ou)Ou)ou)ofnoinoino W (n Z z s - c -NN MM V V f0(0 (O (O rr 00000)0) 00 N ? 0 d o 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 Preliminary Hydrology Report Appendix E Preliminary Land Use Worksheets J ^��OO�MNN�NO 0) 0M F mnNmoi _r0 W, 0.N-ONO.O• h OrO 0.,NrM ❑ W a OD tll O N N N 7 O a0 OO O T N O I� A 0) Oy w °270ONOv 0NO0 0000,4 � a a O 0 x W J NQ 0 m ornn 00000°000° Q z N d M - e 0 0 0 0 e 0 0 0 2 �� .70, -CON N O o 0 o N 0 0 0 N O W 0 N W O N 0- V N O O O O N O O 0 N wo a ww K 0 2 ❑ (0W J Q O0 0 0 0 N 0 0 N 0 0 0 0 N 0 0 0 N o )0 `OO W OOT 00000) 0000) a w u 4) 0 0 0 0 0 e 0 0 0 0 e 0 0 e e O w o O o v o o a o 0 0 o a o 0 0 a wo am w O J J pH v) do-oo-fO ODo °)e0000 j 4�N000woO00,.,0)00004 N w 0 W N J O Q a _ C W N `u)O NONM00.-000000 a w z n U 1. 7 0 0 0 R o o, 0•D o e l G C m vi - o a o y o o r o? 0 o e 0 (-4 6gw SMOMo1°0000'°0004 W N` O N O N O a 0 0 0 0 a 0 0 0 a F u0'U O V o M o 0 0 0 0 0 0 g0 0- g°DOONON0000N00004 W N ~ N O N N N 00 0.0040 0 0 0 N V V W 0 M M W Y N `W 00N000 N,-OI,-LnN,-bN V V W J n 0 0 N 7 N r m m 0 n M N3 Q_' OONc.i.- 0000 Ofi70)N a a N M O N O0 I, - N O M OA O Is N M N V LO V O O I, W W M = 00 N M 7 O O N N M O O 0) M M N N O O N NO W r O OD 10 0 0 0 0 0 M 0 0 0 0 M 0 0 0 M M N ` O O O O O O O O O O O m, `1 0 0 0 0 O O O O N O O O N W W K v M 0 0 0 0 M O 0 0 0 M 0 0 0 M a O H i 0 7 Z 0 Y a M H N o 0 0 0 N 0 0 0 0 N 0 0 0 N w Q O m 0 0 0 0 . 0 0 0 0 0 0 0 z 1- ZrZm N O a O (0 w 7 4 IL 4 4 O Q O 0 0 J . W O W (72- O 7 (J7 W J}}}}- W 7~U F • Z= } U ce 0,z 0H Q N 2 W QmUO W OmmOZOm�zO^S JNfa1 w'Yg' W z W O 0 • U O ON❑o c� �a 00000DWWWmQww<0 000ZZ<= 0000 0 -FW OV,0c9 FFFFi_LLL, _ 0wO W W 00w0<> }000 M 0O0) L 2 ❑ Nw IJi LL wO00O W V10O W W W O' N W 0 3 J 2<02 ❑ 1- w cY.OWt2rrrwl- > 1- i-cowm } 0 W Oxra00000.0 7 0 i-20.2 0 1- Q2L w' W On>0 J J_101- (0 1- RAL MOUNTAIN 1- z U H W x Z ›- to to La reLa z cocep J N * W N N- O O o M -, 0_ L 2 HYDROLOGIC SOIL GROUP B J N N 7i-2,7)2 a M o O W N r- 1.1.1 W ▪ Q M a eo in tS, F_ 0 to N U O W N`,2 a. W CI' p 0 x LU W mato mo 00 aZ IIS V o�o o� Oo m d d d ed CLy w re w• ' W O a l0 UI 0 0 0 O O • Z IIS V o 0 0 0 0 O w K` 0 0 0 0 0 a'O ay w re 0 J O ' N a to N w a z j O W K o Z N W J � O W 0 a• s a w l 0 N 0 0 N ▪ W N `! O N O O lf! a �. II V O I� o o n a C` O N O O N 0 V0 0 0 0 0 0 ` 0 0 0 0 0 13 0 0 0 0 0 o 0 0 0 W a' a' w N O O O O) 01 W D N` 0 0 0 0 Of F F II V 0 0 0 W10 0 0 0- 0 V) W Y N T8 z• -8V:. w J II V 0 0 0 0 0 ▪ j C v O N O O N N >> x M M I- re to `co o Nson II W N LLW K o O V O �.�j CL 0 Z Yam— : TTM 37815 - CORAL MOUNTAIN W 0 wW cca w 0 7 p 0 O N UZN 0 M ,a <2 -r5 22 HYDROLOGIC SOIL GROUP A oQ WW aQ 2 W p 1- o CZ UN cqT-O V CO 0M mi 6 M oi 6 0 0 0 N^ 6 V OOD ^ W r W (NOR, n N V � U � � V � N c0 M V M T.:: if W U y W La W 609 4° 8 c00 N O cu O d II ct,r- 0 N t 0 6 t 0 O M 00! (n Q % Q = Z Z O 0 c0U M^ 0 0 0 0: 0 Il J❑ c cA U O c0 N N 0 0 0 O N O (7) Q c0 Co O N I- Ti 0 0 0 O O • W O WE Q F.5 Z W col 0O d O O 00)) 0000 0000 ON)O Q7 0 0 0 0 0 0 0 0 0 0 0 0 V1 g Q A 0 0 7 0 0< 0 0 0 0 4 0 0 W 2 D- < G c o 09 0 0 N Q S O N O O a b a M O M O W 0 � J W Q U DW Q i J 0 0 U c N N CO O CO O Ce 0 0 CO O O O 000 CO O O O M O O O U O Q0) .-646c466,-:66,6 O W O O O O T- O O o IID O V O c4 0 0 I- O 6 O CO W e i_D0 d00))NON04.0000000 .000000 WQ m O O N O N O O O O N O LL 0)) _ N M w J 0 0 OND 0 00') CO O 4M) 0 0 N 0 W U O 0 7 Ifi I� . CO CO 0 V 4^ j. s N N N ° 0 0 0 0 If) x U m 0 0 N 0 0 0 0 N 0 0 0 0 N 0 II U0 0 0 0 O O O O O W Q (O,M0000 0000 MO wa 0 0 Z a U O '\ni d 0 0 0 0. 0 0 CCD 0 0, o w0, 'UQ ,2666 vM000 CD CD CD 0 M O 0 0 0 M 0 IL D 0 x W F W J N Z OLU O J � c9 9WW(72—Hii 0000000000 (000 00 00 00 i- 0 Coral Mountain Preliminary 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 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 548,486 sf 456.0 ft 726,985 sf 0.0 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 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 3.97 590.00 [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 452.26 1.26 504 [11] S-FEET/MILE LOWEST FLOW LINE ELEVATION DIFFERENCE (ft) 2255.2 [12] S^0.5 LOWEST PAD ELEVATION DIFFERENCE (ft) 47.49 [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 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 4.58 799,746 18.36 3.97 789,971 18.14 4.02 803,730 18.45 3.95 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 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) 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 N CO N. v CD CD r 0 0 CO LO O O 0 0 0.0064 0.0250 w CO N O 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 N JoJ 0N J II J H °oE2 m oJy m -0 aTE a Ul 0 a , C O N > H .t. Gm O. 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 co oz, O AREA WEIGHTED AVERAGE 0.219 0.216 0.013 0.115 0.035 0.050 M O (n W Ce 0 CO CV C 0 5.752 8.141 57.186 0, t` CsiL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC 11 ADJUSTED INFILTRATION RATE (in/hr) co rn co 0 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 N 0 O- 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] co co co N. co co 0) i() co co i() 0) co if) 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 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J WCD .17/ N N> m> _ 451.03 451.06 O 7 V V 451.19 451.24 451.31 451.40 N 0 0 V ,t - 452.06 452.09 `c?,0 otE C 0.40 0.92 1.48 2.08 2.76 3.55 4.50 5.78 8.04 14.47 15.48 15.92 N F m C 0 U 17,538 40,181 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 0000000000001 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 549,471 550,743 552,110 553,573 555,227 557,167 559,490 562,625 568,149 583,897 586,364 587,444 Basin Volume cu -ft 17,538 40,181 64,525 90,570 W n 0 O 10 O a N LL) 195,929 251,748 350,104 630,509 674,420 693,659 N E 5 o O U — 0 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 7 a CO N ID 1, 81.15 86.82 00 Lo 0 137.86 186.07 W CD n O co 0) co CO M o V . a) C ')p t 0ce C W 0.36 0.46 0.49 0.53 0 0 o I- O O 7 co W.- O 0 0 --0U o r.- N 6 0.89 0.39 Loss Rate in/hr Max 1 Low 0.53 0.62 <LO 00 CCD 0 0 CO W 0 0 m O 0- 1.92 5.07 CO N 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 NCO CO h 0 0 0 0 1, 1., 0 0 0 r,- CO 0).- 0 0'-'- 0 .:1- 0 0 C,1 0).-0 N 0'- 0 0 O RCFC & WCD G 7DGi0O1. Wf NIG1Gfl. IMIL 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) 3.6 4.2 4.4 4.6 o co 66 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 CO r-- LO 0 0 0 NMN n CO 0 0 O O) O 0 L0 oO LO N 25 30 35 40 45 50 55 _ 60 Unit Time Period N- N 0) V lD (D I- W 0) o`- N C 0) 0W 0) 0) N 0) 0 0) 0 U } U 0 N O O) U OLo 7 N N N 0 O 0 Q I� O ' co o a 0 O • O It 0) ) 0 p W .- 0 0 00 W m 7 J O W G Q o w o z J 0 LL ~W W UUco J• W (OL z WWOO W'- O O Zm>?�ymoz• o W I_1`n_>WWwma 2vi> 0 W Q W O W O O» Y Q LL r z J u O O 3 a X Q - W W I- 0) O W L L 0 Q 0 I- Q 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 m m � 451.01 451.01 451.01 451.02 451.03 451.05 451.05 451.07 451.09 451.09 451.11 451.12 451.14 451.17 451.19 451.21 N N 0 0 451.30 451.33 CO V 0 0 451.46 451.50 451.54 I U t6 ; C N 0.08 0.15 M 00 0.44 0.66 0.80 1.02 N CO ,, 1.54 1.76 CD V NN CO O NM 3.51 4.00 4.39 4.87 co co Mm 100 6.67 7.24 7.84 Om N U A 0 (6- 46 N M r,:C6 N cob N 34,815 44,484 - O 10 (00 V r c. (^O 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 548,674 548,862 548,908 549,238 549,568 550,111 550,441 550,984 551,527 551,857 552,259 552,802 553,629 554,456 555,283 _ 555,968 557,079 558,261 559,230 560,412 562,020 563,486 564,811 566,206 567,672 Basin Volume cu -ft 0 C' 0 N mO) h 6. cr N 34,815 44,484 A 0 67,171 76,840 91,566 106,292 CO 1:, O N CV CO _ 152,999 174,047 N0) MM MNm�O O N _ 240,982 267,086 _ 290,662 315,502 341,607 N 0 °V MM CO 820 5,877 0^ 00 N 0) 0 OO 10 0) 0 N. (OO 0) (n 0 0 CO N 0) 0(000 N N hl„ V 7 N 0 J h 19,783 21,047 17,255 21,047 M7 (0 0 CO N N 23,576 24,840 26,104 Flood Hydrograph Flow cfs (O CO N_ 2.73 19.59 19.59 32.23 19.59 32.23 32.23 19.59 CO CO 01 CO N N CO 49.09 49.09 49.09 40.66 N- 10 O � (O N.- 57.52 70.16 95.44 87.01 78.59 82.80 87.01 Effective Rain in/hr N... O 0 O O 0.02 0.12 - N- O O N O O 0.20 0.12 LO N co 0.30 0.30 0.30 0.25 0.40 0.43 M CO co 0.58 0.53 0.48 0.50 0.53 Loss Rate in/hr Max 1 Low 0 co N N O O 00) N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 100) CO CO O O OO 0 0 O O 0.48 0.44 0-0) 10 LC, 0 0 N0) 10 LC, 0 0 NO 0- CO 0 0 CO LC, OD CO CO co 0 0 0 n r` N N O O 0.27 0.27 0.27 0.27 0.27 0.27 r` r` N N 0 0 r r` N N 0 0 r- r` N N 0 0 r` r- N N 0 0 r` r- N N 0 0 r` 0-0.0-0.0-0. N N 0 0 N N 0 0 N N N 0 0 0 Storm Rain in/hr co co 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 60 0 O O ((0 ((0 O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD MUDDI3o©I1= Ctrl FACACME 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) 'I cl T- 10 10 CO 1n 0 1.8 1.5 (0 0 N N N N 2.2 2.0 CO N- N (V 0 r N (V co 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) 0 ON- 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(0 35 40 45 50 55 60 65 70 75 80 CNO 00 O 0 _ 105 110 10 0 10 T- T- T- Unit Time Period T- N CO 0 10 O 0. CO 0) O , N 7 15 16 0 CO 19 20 21 22 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 aLu sit 451.68 ' 451.68 451.73 451.84 451.97 452.11 452.21 452.23 452.24 452.26 452.26 0CD 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 CDCO SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 79,919 572,734 574,484 _ 578,577 583,026 588,113 591,567 592,252 592,795 593,338 593,402 Basin Volume cu -ft 381,618 431,743 462,904 535,785 614,988 705,569 767,072 779,270 788,939 798,608 799,746 Volume In cu -ft 40,011 50,125 31,161 72,881 79,203 90,581 61,503 12,198 tO COo Flood Hydrograph Flow cfs 133.37 167.08 103.87 242.94 264.01 301.94 205.01 40.66 32.23 32.23 3.79 Effective Rain in/hr 0.81 1.02 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 Storm Rain in/hr 1.52 0.51 0.46 0.46 0.15 RCFC & WCD GOO oDD o@E Ctrl FACACME 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) 3.5 6.8 5.9 2.0 Time Minutes Hours 2.50 2.58 2.67 2.75 Loco 0CV 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 Loin o %9) Q CI N- a, a, CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm V,c W CO 451.00 451.00 0 0 7 7 0 0 7 7 0 0 7 7 0 . 7 7 451.03 451.03 0 0 7 7 0 0 7 7 451.05 451.05 451.05 451.06 451.06 451.06 451.06 I 451.07 = . (6 ; C 7175 N CO (O CD CD 0 0 O (0 0 0 (D O c- N 0 0 a CO N N 0 0 N (O M M 0 0 O 7 V V 0 0 Cr, CO V (O 0 0 CO N IO (O 0 0 I- CO r 0 0 co O r co 0 0 N Cr, co co 0 0 7h - 0) 0) 0 0 O @ m o U M O N O N(0 Nnr.j OD IO NN �(0O MIO OO W .5ON r W N 0(V M 7)O O)(0 Ct)" ION ON MMNN r': 0 OD IO rM MN N N W ;7, W. t.,i N N IOzs O(0 A.0) 47M N M W I� (0 M� W MCOiE (0(0 (O W M M� N M 7 ON 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 O 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 548,555 548,637 548,720 548,802 a W 00 COM W W V V N LC, 549,077 549,173 549,269 549,365 549,461 549,571 549,681 549,791 549,901 550,011 550,121 _ 550,231 550,340 _ 550,450 550,560 _ 550,670 550,780 f 550,869 C (p D D mU MO N O) N 0 N OD IO IO N .- 0 ni vi MIO 0) O O W O h 0) N IO N O N M 7 IO O) O MO ION co N M CO. h O OD IO h M N N N M CO 0) 00o N N- IO co 0 O M OD O r 0 0 M V O Moo 0 W O W N 00 M OD V O N; Ce B D.. co I- N (O N 7777(-(-r . t` r O O .. . t` N O .. . N N .. . N N (-r .. . N r (O (-0) .. . t` r to (O 0 0) .. . t` r N O 0 0) .. .. t` r V O O)0) .. .. t` r to O 010) .. .. t` r to O 010) .. .. t` CO IO CO 01 IO .. .. Flood Hydrograph Flow cfs 4.08 4.89 4.89 4.89 4.89 5.71 n r 6 6 r r vi 6 5.71 6.52 N N YD IO 6 6 N N IID 0 6 6 6.52 6.52 6.52 6.52 6.52 6.52 6.52 5.29 U C L a) Q' 6 W O M 0 0 M M 0 0 M M 0 0 M M 0 0 M M 0 0 M a 0 0 7 7 0 0 7 a 0 0 7 a 0 0 7 a 0 0 7 a 0 0 7 M 0 0 Loss Rate in/hr Max 1 Low nr 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(0 N N O O M(0 N N O O M(0 N N O O M(0 N N O O M(0 N N O O M(0 N N O O M LL) 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 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 MUDDI3o©I1= Ctrl 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% O d U W 0 0 0 m E 0 0 O CD W. 0W. O CD I` O CD I I` O CD I I` O CD I W O CD OD CD O CD OD W O CJ OD W O CJ OD W O CJ OD W O CJ aO 0) O CJ Time Minutes Hours O O 0.25 0.33 0.42 0.50 M(00.....,0 LO O O 0.75 0.83 07 MON- N 1.42 1.50 1.58 1.67 1.75 1.83 MEM 2.00 O IO O N IO O N CM IO O M a IO O a (O IO O (0 IO O (O (- IO O r O IO O C0 CO0) IO O 0) cp IO mCD 0 co � LO CD Unit Time Period A. N co d' IO O r CO O O,_ N 7 15 16 � CO 0) O N N N N M V N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm W m 0 m 451.07 451.07 451.07 451.08 CO CO O O 7 7 451.08 451.09 451.09 451.10 451.10 451.11 ‘.N 7 7 () N. 7 7 451.15 451.16 451.17 451.19 451.21 451.22 N I� N N V 7 _ 451.29 I 451.31 w U (C C C 1175 N N (O O O T- O) CO O v7 T- T- (D O T7 N T- T- a r N N T- T- (O N M V T- T- O N 0 0 T- T- a O (O I T- T- r CO CO O T- T- CO .-- co N N 7 (0 N r N N N CO O N M M CO CO N N M M ,7 0) N 0 7 7 O m ~ C A U Wn,o(0 co O) .1In V 7 N.— 1` Oi V 7 MN I- M ON L0 (0 ONMNn0)cr O) (0 cti L0 (0 1-. 0) CO3 0) (0 ,— co (A WO co (0 N 17- 1` COOM N,— O 0 (0 N(n0OrON0W co 1` N000 0) 6 N `- N N N ° 't Cr, 0 NCO L° O N co cti C0 0) 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 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C O '@ N i) Q N C) a O CO r CO O O O (f) N N N (0 I,- N V r N (0 (0 N (0 CO )0 CO N M V (0 (0 N (0 a M O (f) (O (0 (0 N (0 a O CO (O h O (0 (0 N (0 (0 O Cr N M N N (0 (0 N (0 I., 0) O I� N r N N (0 (0 N (0 (0 a (0 N O M M (0 LO N LO CO CO CO O M L0 (0 LO N LO O COCO O M O N V (0 (0 LO N LO a n CO N O (0 LO N LO N O V r N 0) n L0 (0 LO N LO 0) O Cr, n r W O) (0 LO N LO Basin Volume cu -ft 44.389 45,976 47,564 49,151 50,739 52,327 7 N o.,)(00 M (0 in 41 0 CO r 0M) W 0 O 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 W rn N CO 0) N 4- C U 00000(00(00(00(00)0)00 4') CO 6 O .-.- CO CO N 6 CO CO N 6 .- CO CO N 0 .- N N M M N N M M 7.d. N CO M 7 a CO CO 7 a 1` 7 (O co' 0 7, 1` r ai 6`-`-" 1` r M M 0 0 O O N N co co (O N Flood Hydrograph Flow cfs 6.52 5.29 5.29 5.29 5.29 5.29 5.29 5.29 6 0 6 0 6 0 0 (O 21.60 27.03 32.47 32.47 r r co M (0 (0 7 V 48.77 54.21 QC x ga-.,-'E W V M 0 0 MM 0 6 MM O 6 MM O 6 0`0 0 O 6 0`0 0 O 6 0`0 00� O 6 0 O (J M�0 0 6 00 0 0 MM 0 0 N N 0 0 OM 0 0 Loss Rate in/hr Max 1 Low 0.23 0.25 up (0 N N O O 01 (0 N N O O 01 (0(0(0(0(0(0 N N O O N N O O N N O O N M O O M M O O 0.34 _ 0.37 0) 0) M M O O N N 7 V O O 0.45 _ 0.45 OD 7 LLC 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 O O M M 6666666666 O O M M O O M M co co M M co 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 GOO oDD o@E Ctrl NIG3MML \E 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% T C C (0 d V W 5C) a a a m a m OO)O) 0 0 0 0 O)O) 0 0 O)O) 0 0 OOOOO7 T- T- T- T- T- T- 7 7 T- T- NM T- T- ',7 T- T- (0 (000 T- T- T- T- r 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 r CO M M 3.92 4.00 4.08 4.17 (0 O N co N (0 O M,r (0 O cr LO (0 O LO CO l (0 O co 1--1`03 (0 O (0 O CO O (0 O 0) OO N (0 O N N (0 O N N N (0 O NM N N (0 O N N 000 (0 O LO N N Unit Time Period (n (00 N N CO N N 29 30 31 32 Ma M Cl 35 36 I"- CO M Cl 39 40 41 42 Ma V V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm r, W m w m 451.34 451.37 V V? N 17 7 7 CO Tm 0. N 7 7 451.56 451.60 451.64 451.69 451.74 451.82 451.90 451.98 O Tm O N N 7 7 CO 7 N N N V 7 V 7 N N N V 7 V v N N N N V U ; C it N O LL) O V N uim CO N 0) V O6 a 0 6 O r 0 0 n M W CO 0 co O O CO 6 OT- O M M Ni W 0 0 Oe..: 0 0 M W 0 m2 W tD 0 Mt W aC O @ H m O U CO Tm MO r N r 101001 M N N 0 CO ONO 70 Nn N N CO r CO n ON 00 CO M CO CO U1 a0 co N CO 010 6 M m4 O 1010 06 OM 7 7 0) Tm O N CO MCO t`10 710 V CO ON 0 co Oi 0 (ON N O CO r I` M6 a0 (O 0010 CO I` O CO I's 10N V O 1-:"(0 0000 t` I` N CO V N 10001 r 000)0 C000 I• I` CV CO f� a0 I• N. 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 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 Percolation Area sf 560,715 561,811 562,999 564,187 565,467 566,838 568,301 569,764 571,318 572,964 575,068 577,630 580,466 583,577 587,146 591,539 592,544 _ 592,634 592,716 _ 592,785 592,826 _ 592,853 Basin Volume cu -ft 72217.738 37,261 258,415 279,568 302,353 326,767 co co 10 CO co N W 6 N- 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 N E C (1 15 U M M so NNS M 0 r 0) T- 7 a �� N N 7 W (700 N Ni N N N 711�0N cO O. N N O O cc) co e. Oi N N W N 7O e. u5 CO a M c0 00)7N (OM O LO N 0 0- N (0N M a0 O n M W 07 CO r- Tm f�M , 640 r V Flood Hydrograph Flow cfs c(00 CO di N 1n co 70.51 70.51 00) CO 10CO N-0700700) CO 03 (0 N (00 Ni r 124.86 152.04 M (�0 co co 211.82 260.74 59.64 5.29 4.89 4.08 2.45 1.63 d 0 = LL' C W 8O 0 0 MM 0 0 O0 0 0 MM 0 0 N 81O2 0 0 0 0 MM N O 6 022 0 0 0 0 00 0 0 Loss Rate in/hr Max 1 Low 0.53 0.56 0.59 0.59 CO 113 c0 (0 0 0 0 W O (0 0 0 O CO r rM 0 0 0.87 1.01 O W CO W 1) CO 10 O N 0 0 0.17 _ 0.14 OD ID O O O O r 1` CV N 0 000000000000000) 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- r N N I` r N N 00 I` r N N 00 0- N- N N 00 Storm Rain in/hr MM0 000 0 0 O O 0 0 0.73 0.76 0.79 0.79 0.83 0.86 CO 0) 'r N 0) 'r .- 1.56 1.85 CMO CD 0) O O 0.20 0.17 O- O O O RCFC & WCD GOO DDD o@E Ctrl NIG3MML \E 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) co O N H CV N 2.2 2.3 a 7 N N 2.5 _ 2.6 3.1 3.6 3.9 4.2 4.7 5.6 0) 0 . O 0.6 0.5 CO N O O Time Minutes Hours 113 CO N 6 V 7 N 0 a O a a W r N O a a c0 CO r 00 a a N O CO O a 10 CO I` O.- If) 0 10 M N M If) 0 N 0 7 LO If) LC) CO r LO CO If) LC) 10 CO r CO If) 10 N O Cr, O 0 10 11) 0 1n CO N N 10 0 CO 1- N N 10 0 r M N N 10 0 CO 0) N N 10 0 0) 0 N CO 10 0 0 CO CO 10 0 N CO CO 10 0 N M CO CO 10 0 CO V CO CO 10 0 V L0 CO CO 10 0 10 CO CO CO Unit Time Period 51 52 53 54 55 56 57 58 0CD CD CD D 63 64 CO CD CO CO 67 _ 68 10 0 0^ nN- EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY %55 % 55 5 1= 1 = 1 w •C •C O U C@ U@ U U E n 7 N th mN j cq •U 0 N O — O O (M0 CO CO CO 0 1- z O W W N W 00 W o Z W W 00 gg Q 000 M I -W 0 0 Z 7 Z W J 10 j>> w w W O m W J0O 0 0_ _ N W J <OHW0000O1- W,WO QWL LLQ PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J V) W m 451.00 451.00 451.00 _ 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 O O V V 451.05 451.06 451.06 451.06 451.07 451.07 451.08 451.09 451.09 451.10 451.10 451.11 N CO V V 7 V V 451.15 451.15 00 00 V V 451.20 451.22 451.23 451.24 451.26 Total In Basin cu -ft 1 ac -ft N 7 OOO 0 0 I� r 0 0 co co 0 0 O) N N NN 0 0 co O CO 0 0 0.34 0.39 0.43 0.48 0.52 0.57 M d)d) CO CO O O,- 0.75 0.83 0.88 0.94 00 I, LO N 1.34 1.43 N (O co 1.72 1.84 1.97 2.11 2.25 2.26 2.39 2.61 2.89 3.25 CO N O 0,U)c0 M M M 782 1,954 3,126 4,690 5,862 7,034 8,207 9,770 11,333 12,896 14,850 16,804 18,758 20,712 22,666 25,011 IO ,_ (O O) OD O F.: f.: O N co 32,827 35,953 38,298 41,033 44,160 47,286 50,803 54,320 58,228 62,136 66,044 70,343 N N M L - O %- N O I-- co 85,974 91,836 98,089 98,254 104,254 113,478 125,920 141,576 147,438 153,299 165,530 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 O O O O O O O O O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O O O O O O O O O O O 0 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) 0.13 C 0.00246 Low Loss Rate (percent) 85.00% C O U Q N 0 IL 548,530 548,596 548,662 548,749 (O L- 00 c0 CO co- W cr 7 O O 548,947 549,035 549,122 549,210 549,320 549,430 549,540 549,649 549,759 549,891 550,022 550,176 550,330 550,505 550,637 550,791 550,966 551,142 551,339 551,537 551,756 551,976 552,195 552,437 552,700 552,985 553,315 553,644 553,995 554,004 554,341 554,859 555,558 556,437 556,767 557,096 557,783 C 0 l0 j m U 782 1,954 3,126 4,690 5,862 7,034 8,207 9,770 M W 14,850 16,804 18,758 20,712 22,666 25,011 27,355 30,091 32,827 35,953 38,298 41,033 44,160 47,286 50,803 54,320 58,228 62,136 66,044 70,343 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 Volume In cu -ft 782 1,172 1,172 1,563 N N n I` 1,172 1,563 1,563 1,563 1,954 1,954 1,954 1,954 1,954 2,345 2,345 2,736 2,736 3,126 2,345 2,736 3,126 3,126 3,517 3,517 3,908 3,908 _ 3,908 4,299 4,690 5,080 5,862 5,862 M N (O O 7 O N 12,443 15,655 N N M CO O N Flood Hydrograph Flow cfs I- O CO CO O 1.30 1.74 1.30 1.30 1.30 1.74 1.74 1.74 N- r N N N- r N N N— (O(OO N N Cl. N M 3.04 3.47 7 VD) N M h 0- M M M M 4.34 4.34 4.34 _ 4.78 5.21 5.64 (O(O (O (O In o3 O T- (O O I� (O CON (O O 13.83 17.39 O 0 L LO (O (O Effective Rain in/hr O O O O O O O 0 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 N N O O O O N N O O O O N N O O O O N N O O O O M CO O O O O M CO O O O O M M O O O O 0.04 0.04 V O 0 0 0 0 V CO 0 0 0 0 OO T- 0 T- 0 0 V 7 OD 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low O (O CO ,r O O O O 0.045 0.060 0.045 0.045 0.045 0.060 O 0 (O (O O O O O _ 0.075 0.075 0.075 0.075 0.075 0.090 O (O O) O O 0 0 (O O O_ N T- 0 0 O (O O) O O 0 0 0.120 0.120 0.135 0.135 O O (O (O 0 0 O (O (O (O 0 0 O (O CO O) 0 0 0.225 0.225 0.240 0.255 (f) O CO O N CO 0 0 LO O CO M CO 0 0 (O (O O N N O N N CO 0 0 0 0.469 0.464 0.459 0.453 0.448 0.443 0.437 0.432 0.427 0.422 0.416 0.411 0.406 0.401 T O) CO CO O O 0.386 0.381 0.376 0.372 0.367 0.362 0.357 0.352 0.348 0.343 0.339 0.334 _ 0.329 0.325 0.320 0.316 T- O M CO O O 0.303 0.299 0.295 0.290 0.286 0.282 CO Or Cl N N O O O Storm Rain in/hr 0.035 0.053 0.053 _ 0.071 0.053 0.053 0.053 0.071 0.071 0.071 0.088 0.088 0.088 0.088 co CO CO O O O O 0.106 0.123 0.123 0.141 0.106 0.123 0.141 0.141 0 O N o 0 0 (O CO n r 0 0 (O ,F r O 0 0 0.212 0.229 0.265 0.265 0.282 0.300 0.335 0.353 0.370 0.388 (O (O CO Cl N M O O O RCFC & WCD FAzamaL 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 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 co I� O 0 0.7 0.8 co n 0 0 0.8 0.8 O) O) 0 0 O O T- T- O 7 T- T- 1.2 1.3 1.5 1.5 V1 h T- T- 1.9 2.0 N (V N (O (O O T- T- Ni 0 2 0.25 0.50 10 O h 0 O T- 1.25 1.50 1.75 2.00 2.25 2.50 (O O I- O N M (O O N (O 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 N O 8.25 8.50 N O h 0 W O 9.25 9.50 N O h O) O N (O 0 O O O O Time Minutes LID M 45 60 n OOj (O O O 135 150 165 180 (O O O)M 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 0 O (O 7 (O (O (O Unit Time Period N M V 0 co I� co co OT- CV el cr 0 O 17 18 19 20 N N N CO 7 N N 25 26 27 28 29 _ 30 N M M 33 34 (O (O M M 37 38 39 40 N M V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm ) Iii N Op CO $ CO M m LO a V 451.32 451.33 451.34 451.39 451.44 451.50 451.56 451.65 451.73 451.77 451.82 451.88 CO C u4 u4 V V 452.04 452.09 452.14 452.17 N N N N V V N N N N V V 452.21 452.22 452.22 452.22 452.23 452.23 452.23 452.23 452.23 452.24 452.24 452.24 452.24 452.24 452.24 452.25 452.25 452.25 452.25 Total In Basin cu -ft 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) Is NM V (O V V 15.23 15.97 CO CV (O (O h 17.59 17.63 CO 0) CO (O N.:, N4 17.72 17.76 LO CO O h 17.89 17.92 CO CO 0) 0) r N4 18.00 18.03 18.07 18.09 W C co W W C V0 N N N W C W 178,345 189,132 200,490 207,202 217,079 245,745 277,562 315,130 r CO CO 0) CO 0 u) O u) 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 558,502 559,108 559,746 560,123 560,678 562,288 LO LO 1.... CO O T- (0 O O (O LI, LO 568,471 571,518 O y- 0) 0) O O O (N-0 n LO 577,615 579,753 581,772 583,818 585,745 587,552 589,239 590,367 591,519 591,607 591,695 591,760 591,826 591,936 592,046 592,156 592,243 592,331 592,419 592,485 592,529 592,595 592,682 592,748 592,792 592,858 592,924 592,990 593,033 593,099 593,143 C0 y N D m > U 178,345 189,132 200,490 207,202 217,079 245,745 277,562 315,130 M 0 CO O L6 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 0)) N 0 N M N r 793,178 794,351 795,132 Volume In cu -ft 12,815 10,787 O N M O 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 CD 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 M N N n ,- 782 1,172 M N N n T 782 1,172 1,172 1,172 N CO n CO r n Flood Hydrograph Flow cfs N W (NO 7 I� 10.97 31.85 35.35 41.74 45.23 60.29 W CD CO 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 Ns , (Ni Ns 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 0 0 0 0 0.08 0.05 O- 0 0 0.22 0.25 0.28 0.37 0.37 0.18 0.18 0.26 0.24 0.25 N N O 0 0.20 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 I 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 0 O 0.060 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 CDCD O O O 0 0 0 0.266 0.262 0.258 0.254 0.251 0.247 0.243 0.240 CO N CO CO N N 0 0 0.229 0.225 0.222 0.219 0.215 0.212 0) O 000(3)0) N N 0 0 N (3) N 0 0 CO CO (3) 0 0 0.190 0.187 0.185 0.182 0 O n n O 0 _ 0.174 0.171 0) 0 OOOO 0 0 7 N 0 0 0) Is (Ou) 0 0 uO CO (Ou) 0 0 0) )0 0 0 Is 0 7 NI. Ni. 0 0 0 Storm Rain in/hr N M M CO O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 N O 1n O O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 0.335 0.071 Is 1f) O O O O 0.053 0.088 0.088 0.088 0.071 _ 0.071 Ns 1f) O O O O 0.035 0.053 0.071 0.053 0.035 0.053 0.053 0.053 M 1M M O O O O O O RCFC & WCD FAzamaL 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) CD d) N r O) I- r r co. u) r N (JD CO N N 2.9 3.4 V CO M N CO I- N N 2.6 2.6 (O V N N 2.3 1.9 0) V , 0 V CO 0 0 0.3 0.5 0.5 0.5 _ 0.4 0.4 0.4 0.3 0.2 0.3 7 CO O O 0.2 0.3 0.3 0.3 Cl CO N O O O 12 O 2 0u) O N • T- 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 CD U, O N 4 7 N 14.50 14.75 CD U, O N N u) N 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 Ou)0 O N u) N N N Time Minutes (oO CO O 690 705 720 735 750 765 780 795 810 825 840 855 870 885 O u) 0) (3) 930 945 CO0n 0) (3) O 0) O 1020 1035 O N CO(0 0 0 _ 1080 1095 1110 1125 1140 1155 1170 1185 1200 1215 1230 1245 LO 00) Unit Time Period 44 45 46 47 48 49 50 51 N CO O u) V u) O u) 56 57 co 0) (010(0(0(0(0 O N M 64 65 CO I,- (0 CO CO 0) CO 0 LL OL N CO I� r 74 75 O Ns h CO O) h F. O CO 00 82 83 0 u) O CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J W O $N N N U) a V 452.26 452.26 452.26 452.26 452.26 452.26 452.26 452.26 Total In Basin cu -ft ac -ft of O(+) N M N O V M M O co (OO M M O O 18.40 18.42 18.43 18.45 796,305 797,086 798,259 799,040 799,822 800,603 O 1 -- co O (O M S- T- N O O CO CO 802,948 803,730 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 593,209 593,253 593,319 593,363 593,407 593,450 593,494 593,538 593,582 593,626 C N 7 m ; j 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 1.30 0.87 0.87 0.87 r n co co 0 0 0.87 0.87 Effective Rain in/hr 0 0 o 0 0 0 0 0 0 0 0 O 0 0 O O 0 0 O O Loss Rate in/hr Max 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 0.139 0.138 0.137 0.136 0.135 0.134 0.133 0.133 Storm Rain in/hr 0.053 0.035 0.053 0.035 0.035 0.035 0.035 0.035 In Lo co co O O 0 0 RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z 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) M N 0 0 co. N 0 0 N N 0 0 N N 0 0 N N 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 (0 O N V V V Unit Time Period 87 88 O) O N Cr) N 01 O) 93 94 (0 CO 01 01 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C U C U V U V N C N 6 O V 4F E 7N U1M7n (40 Up U5 0 O M O M COOO O CO CO W W N Z 0 ww co w~ W u-,00 J 0 Z W W OW 0O ,l— U LLL O (o W 7 0 co tj Z W _iOe J cnjOOWWwO¢w C0 J CO 0 Z_jV 7--3: ww O Q O l L J W W Q W O> F2'(nw LLLL 2d' 2d FQ 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 0 548,486 0 0 0.00 456 5 5 178,499 726,985 3,178,217 3,178,217 72.96 WHERE: V = 1(El — E2 )(141 + `42 + AlAiA2 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 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 1-7 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 x D] 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 0 U 32,230 41,975 N 0 ,- LO 0 7 (0 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 co 0) 0 O 7 N 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 7 CO 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 In O 0 OD W CO M M , 113,494 113,658 113,326 O)n E 0 > 7,528 10,250 M j co."-- ui O 18,074 21,136 Mmr M mr 743 743 248 Flood Hydrograph Flow cfs 25.09 34.17 17.16 54.58 N I OD n r.- o 7 O V OMD N N 0 Effective Rain in/hr O O N M 0 0 0) - 0 0 0 00 O 0 1 0 0 0.50 0.00 M 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 0 O N 3.5 6.8 CO N I- co 5.9 2.0 0 CO 0 ,- N- O Time Minutes Hours N N N C4 coCOV M N N 2.50 2.58 2.67 2.75 CO 0 0 OD N N 00 O N co M 140 _ 145 150 _ 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 N M M M 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C U U C UU U U U 00M 0)� O0 000,,),.._"..= T- CO CO CO (00 00 CO O c0 0i D N N ` h N• - AR O F- CD O wW Nr 0 0 Lai Z uj I- J <M2,2° Q OJ w O CO M Z W 5Ju)j 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 @� w ° 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 CO 'I' o w vv 459.03 459.03 o 0 oiw vv 4, U CO C C i0 N 0 0 0 0 0 0 0 0 o 0 . 0 0 0 0 o 0 0 06 0 0 o 0 0 0 o 0 0 0 o 0 0 0 .- o 0 0 0 N N o 0 0 0 N 0) o o 0 0 7.cr o o 0 0 N tO o o 0 0 N 10 o o 06 N N- o o . 0 0 Om N UON COO O) M N COO M r CO co I- `—N O N N N I- N N O VO O NVrONN V N W 8 t4 gJN (V (V W V N O (V (V V WO N CO (V (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 C (0 (0 z d y U4 N a 0- N c07 co CO (n N O N N CONN V V CO W N<66<66<66<66N N N LC)LC)C0COCD CO W N N CO ,- CO W N N M N CO W N N C0 00 CO 0) N N O O W 0) NN N N O 0 W O) N N N O O) 0O 0 0 <6 <6 N O N CO 0 (OO N O N CO N <6 <6 N O NON N— <6 <6 N O N N M <6 <6 N O Basin Volume cu -ft 444 477 N. CO V N 536 556 575 595 r O CO r N M 812 885 957 1,082 h N O M I. N O O V N t` I N M (O N O O CO N N 2,642 2,977 2,741 2,504 MIEMM 3,342 N E w = C jUN4nrnrnrN 15 10 r r r r r r r 0 0 M 0 O N M O CO N O CO CO W N (O O) M N N N 7 V N N ) ) 7 V FlNN O OO) O Flood Hydrograph Flow cfs 1 .41 1.59 1.59 1.59 1.59 1.59 N � N- N-.- 1.77 1.77 1.77 1.77 1.77 1.94 1.94 1.94 c- COom N N 2.47 2.47 2.65 2.65 0- N- O O 3.65 0) C U '(p s a' C W N N O O D 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 CO O O CO CO O O CO CO O O 10� O O 10� O O 10 (O O O 0 CO O O r 0) O O 0.20 _ 0.20 N N N N O O CO CO N N O O 0.24 0.26 (n N N N D 0 CO N N N 0 0 CO 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 N N 0 0 N 10 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 (O CO O O (O CO O O (O W ,- O O W 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 m D 0 O)O) 0 0 O)O) 0 0 O)O) 0 0 OOOOO77. T- T- T- T- T- T- 7 T- T- NM T- T- ',7 T- T- N N T- T- (OW T- T- N 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 M X N O M,r N O cr N % N O N (0 % N O co 1-- % N O 1` O % N O CO 0) % N O O) O N N O O N N N O N N N N O NCM N N N O M V N N N O 7 N N N Unit Time Period 6 CO N N 1- CO N N 29 30 31 32 M 7 M Cl 35 36 I.- CO M Cl 39 40 41 42 CO 7 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 Inn 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 N 0 M O T- 0 0 n T- CV 0 0 h M NCO 0 0 M N17 07 0 0 h (O (0 co 0 0 0 o co co. 0 T- N M N- T- M N- "-1 N- N 0 0) N N 0 M N N I- (0 N N O W m S U 3,952 5,459 MM M 11,709 14,514 17,753 20,987 Tr in M O n 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 ( 0 7 7 CO CO CO 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 O LO ( O N N (O (O M O N (O (O M O O (O M M O N M (O CO 7 7 CO CO (O CO 7 7 0 7 h N..1` 7 7 h(O W 7 7 0 (00) 7 7 h CO 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 CO (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....N.. 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 -a-up 7,864 9,805 12,179 14,988 N 7 W N 25,139 29,242 0 00 M 7 53,736 64,791 78,016 95,155 , O 0) 0) 95,798 95,501 95,099 94,644 O E 'f =E j U M O M (O -077 T- T- M M 007 N N P. N P. MN N M (O (0 I- r M CM N M (OM ..1�0 7 7 M I72 CO CO N N Mr N(n O. � 7 N Nal I�(004 M M N- T- CO LO M M N 00 -O Flood Hydrograph Flow cfs lMO 66 8.02 8.02 rs 7MMM 0 T- T- 13.84 15.29 22.57 29.84 Non) M op 45.85 58.94 5.11 1.59 1.06 0.88 ( M O co Q C mcc s Q' C W 00006ci 8 Q 0 0 0 0' 0 0 N 0 0 7 7 6ci 0 0 M I. 6ci 0 0 (O M NM 0 0 a0 M M7 0 0 (O (0(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 r 0.44 0.52 00 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 co N N 0 0 (O co N N 0 0 (O (O N N 0 6 (O (O N N O 6 (O (O N N O 6 (O In 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 (V 2.2 2.3 00 N N 2.5 _ 2.6 3.1 3.6 3.9 4.2 4.7 5.6 00 ,- 0 0.6 0.5 MCV 66 Time Minutes Hours 0) M N M 777700000 N O 7 (0 00 N- (0 M (0 M I- M N O 0 0 (0(0(0(0(0(0(0(0(0(0(0(0(0 000- 0 N - (0 M N M N O 7 (0 00 I- M (O (0 M I- M N O 0 0 100 0 M N N (n o (O f. N N (n o r M N N (n o M 0 N N (n o 0 0 N M (n o 0 M M (n o N M M (n o N M M M (n o M 7 M M (n o 7 (0 M M (n o (0 M M M Unit Time Period 51 52 53 54 55 56 57 58 0)0, -CV 63 64 M M 67 _ 68 CON -N-1-.. 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 WW(n F W 00 woo 10 Q -= Z W W 0 0 Q 0 00 w O m z z o B Z W 4J(>OOwwWOmw <01— _Jpp NW JC9 Z O 7 1--QLLOOG(7>¢E-W I -M0 W 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' C 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 O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O 00'0 00'0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0 0.03 0.04 7 7 7 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 0 393 753 0) 0 v- CO CO 1- CO QD,0 NT 0M) CO 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 (D W N O (0 CO 608 695 W N O (0 CO 695 695 N N CO CO r O) o O CO CO CO 0) O tD 0 CO 0) 1,043 1,130 CO CO CO OM M M 1,376 1,377 1,379 1,381 O O CO CO CO I". N co co r r M co, r r co, co, r 1` co, 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 LO u) N r co co 1,376 1,377 1,379 1,381 O O 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 < < u) N 0 0 t` O N CO CO < < u) N 0 0 N N CO CO < < u) N 0 0 65,835 65,835 65,835 65,835 65,835 65,849 65,849 65,863 M n (D I.- CO CO < < VD u0 O O 65,849 65,863 I� n N- n CO CO < < VD u0 O O 0) 0) CO CO < < VD u0 O O 65,905 65,905 65,905 65,919 65,933 65,948 (D (O I� r 0) 0) < < (0 uO O O O CO 0) O 0) O < < CO O CO O 66,051 66,109 CO CO (O . N < < (D O (JD 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 Q) 0) O O CO CO 0 ) O O u) CO m 1,043 1,130 co co O M o% ,- ,- CD CIr- 0)) D) M V ,- ,- 1,769 2,130 CO T- (C) T- N M M (0 T- 0 0) CO M N M Volume In cu -ft 174 261 (D V N CO (D (D N N (D V N CO V V M CO 434 434 434 434 434 521 521 608 608 695 521 608 695 695 782 782 (OD (D 0)0)0)0) (OD (0O 1,043 1,130 M M ,- ,- 1,390 1,477 CDD CO LO T-,- LO CV CO Cr/CO T-,- CO CO M N- v-,- T- Flood Hydrograph Flow cfs CD 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 N r r r O O 0.87 0.87 N r O (r 0 0 N co O O 0 T co co T- N T (O u) 7 7 7 7 (D co M co co O 2.03 2.12 (O u) co 7 7 0) N 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 (D 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 LO CO O O O O O 0.047 0.055 0.063 0.063 0.071 0.071 0.078 0.078 0.078 0.086 V N CY) O O O 0.118 0.118 (C) M N CO _ 0 0 Q) 1� V (0 0 0 (C) N CO 1- 0 0 CO CO 1� T- T- (0 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 lam() CO M CO O O 0.349 0.344 0.340 0.335 CO CO M M O O N= M M 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 (CDD CO LO N N N O O O Storm Rain in/hr CO r N O O O O 0.027 0.036 1` 1` 0)0)0)0)0)0) 000000 0 0 N- CO 0 0 CO CO 0 0 0.045 0.045 0.045 0.045 0.045 0.054 0.054 0.062 N O 1- O O O O 0.054 0.062 N 1` 00000000== 0 0 O O CO CO 0 0 O) D) M C0 0 0 O) CO 00 O 0 0 N- CO O= 0 0 0.134 0.134 0.143 0.152 T CO CO 1` 0 0 I- CO CO D) 0 0 V V CO CO M N 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 M V 0 0 M CO 0 0 M V 0 0 V V 0 0 0.5 0.5 0.5 0.5 In CO O O (D 1- O O 0.7 0.8 O 1` O O 0.8 0.8 0) O 0 0 O O T- T- O 7 T- T- N M T- T- In (n T- T- co. 1 T- T- O) O T- N v- N N N In (n T- T- N 0 2 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 r O GV M 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 cc; 1- MEM 7 50 r 0 r W 8.25 8.50 8.75 9.00 9.25 9.50 S O Oj O N (L O O Time Minutes 15 30 45 60 (n O n 0) 105 120 135 150 165 180 195 210 225 240 255 270 285 300 � OM CO CO 345 360 375 390 405 420 1 450 465 480 495 510 525 540 555 570 585 600 = CO 7 (D CO CO Unit Time Period T-. (V CO V (n CO 1- CO 0) C"- T- N T- T- M V T- T- 15 16 r W 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 1- c0 CO CO 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 (0 0 O CO O 0 0 O O h la- 0 0 O O 0) CO 0 0 O O h 0 0.- O O 0.22 0.34 CO la- CO CO O O 0 V 7 O O 0.44 0.45 O M. V 7 0 0 O 10 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 NM 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 ISO 5,500 4,458 3,333 2,125 I- 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) N� 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 (0 (") (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 h O O) 0) O O (0 N CO I- 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 h a- OI- (O (O CO O 66,527 66,332 O O (0 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 (h r (n (n CO O T- 1,477 1,564 N � v (0 N 1,764 2,755 O M O n O DD O (O O T CD 0) 0) 0) N 2,649 2,188 2,439 1,971 1,499 1,023 (0 0) O O T- 348 348 (o (o 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 ('a 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 (0O 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) 0,03C0 O O 0) N- 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) 0) 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 N CO CO N N N 0 0 mt 0) Y- 0 N N 0 0 0) 0) 0 0 Y- Y- 0 0 O O CO M O O 0 0 0.027 0.027 0.045 0.045 0.045 0.036 0.036 0.036 � CO N Y- O O O O 0.027 0.036 � CO N Y- O O O O 0.027 0.027 I,- CO N Y- O O O O 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 I- 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 (0 T- r 11.75 12.00 12.25 12.50 12.75 13.00 (0 O N O T- T- C6 13.75 14.00 (0 O N (0 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 0O 7 V 47 48 49 50 51 52 M V (0 O 55 56 h 00) 0 (0 O,- 0 O N 0 O 63 64 (O CO O O Is CO O O 0) O,- 0 N N 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 J W CO 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 459.00 Total In Basin cu -ft ac -ft 0.00 O 00 0 0.00 0.00 0 0 0 0 O O 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 174 261 174 174 174 174 V V V O Nc- c- c - 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 C 0 MZIM 261 174 174 174 174 07 j m ; U _ O N I- N- N- Volume In cu -ft O 261 174 174 174 174 V V V I� N- h - N ,- c- c - Flood Hydrograph Flow cfs 0.29 0)N MOMMMMM 666666666 Effective Rain in/hr I 0.00 O O 0.00 0.00 0.00 0.00 O O O 66 666 Loss Rate in/hr Max I Low 0.024 0.016 0.024 0.016 0.016 0.016 0.016 O O O ,- 000 O 0 0 0.135 I 0.134 0.133 0.131 0.130 0.129 0.128 CO N N 0 0 0 Storm Rain in/hr 0.027 W N W 0.018 0.018 0.018 0.018 �� O O O O O O O CJ C) C) 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 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 u) n- o fh (6 V 2 N N N Time Minutes 1305 1320 1335 1350 1365 CD 0, CO 0 ) Ou)0 _ N V M co V V V Unit Time Period 87 88 89 O N M 7 0) (0 0) 0) 0) 0 0) 0) 0) EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY == 4F 4F sFC C U U C U 0 U 0^ V U 6 6 13 N m, N W r 0 7 6 (,O r M 0) O N O p ? O 1n 0 W CV N O O r Mo Ns CD 0 Z 0 ww w~ 00 W Z W W Q OU LL O W m 7 m tj Lw Z W �Q>�>FOO»WLHWwOQw OcnmC� ▪ Z▪ _W_V 0X� O< O LL_I Ow W Q W O> i—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 CC Q < 0 0 N N OD ,— 4 x- 0 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 _ m w On N `— 10 M 7 7 468.14 468.15 468.15 468.16 468.17 468.17 468.18 468.19 468.20 468.21 NNNN M M '7"7•7'1. M M 468.25 468.27 468.28 468.29 MM M M 71."771-'1. mM M M _ 468.38 I 468.40 w U 10 1; .0 7175 N 7 7 0 0 0 0 i 7 10 0 0 0 0 c0 10 0 0 0 0 c0 10 0 0 0 0 c0 CO 0 0 0 0 CO N 0 0 0 0 N N 0 0 0 0 N CO 0 0 0 0 CO CO 0 0 0 0 0) 0) 0 0 0 0 0 0 _ 0 0 .— .— 0 0 NN _ _ 0 0 Om @ 0 U N O I� co: -- s— '87'5 ..... N N - a- N N M 0) N M N N 10 0) 100 CO N N 0) a N c!S N N M O N 0) N M M 0) 10 100 M 0) W O M Ni N 7 V Ni 8 0M) V Ni it. i u) 10 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft W CO 81 81 81 82 CON 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 Cr, 0) N O) 0) SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM O 0 f0 O rD d y i Q a 7 0) 0) 0) N N 7 CO 7 CO c0 O CO N CO N N N N COc0 N CO co.. 00 O) N N 01 O) T- c N N N 0 0 N N 0 CO 0) N CO 7 1.0 N CO N. ci CO N CO CO M 7 N N cy O N 1.0 CO c0 co N CO 0) CO N N co N 7 CO CO CO W O N M CO 1.0 N c— N M M Basin Volume cu -ft 1.792 1,890 1,988 2,085 2,182 2,279 CO N N N CO 7 N N 2,587 2,703 N 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 m E w = E j O U > W co 10 N co co N N co co N N co N N N co N Cr) 0) co N O 0) co N O N co N N N co N M 10 N N N N N N N N N N 0) 0) N N N N M M N c0 M 10 M M Flood Hydrograph Flow cfs 0.53 0.59 0.59 0.59 0.59 0.59 0.59 0.59 c0 c0 O c0 0 0 O (0 O (JD 0 0 c0 CO O N 0 0 CO CO N N 0 0 0) (0 N O 0 0 0.92 0.92 O 0) 0) Cr' 0 0 O CO 0 0 7 7 N 0) 7 7 d C U '1p s a' C W c V N O O 0 0 N N O O 0 0 N N O O 0 0 N N O O 0 0 M M O O 0 0 M M O O 0 0 M M O O 0 0 M CO O O 0 0 M C0 O O 0 0 7 7 O O 0 0 7 7 O O 0 0 7 7 O O 0 0 7 c0 O 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 1 y 0 O O 0.15 0.15 ON. N_ 0 0 CO 0) 0 0 N N 0 0 N N N N 0 0 M 10 N N 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 7 7 0 0 7 7 0 0 7 0 0 Storm Rain in/hr 0.13 0.15 10 c0 O O 10 c0 N O O 10 c0 N O O CO CO N O O CO CO N O O CO CO N O O CO N O O 0.20 0.21 0.23 0.23 N 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 c0 ID. Z. W 5O) a a m a co. O) 0 0 O 0) 0 0 O 0) 0 0 O 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- 10 W. T- T- W. W T- N W 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 0- CO M M 3.92 4.00 4.08 4.17 c0 O 0)0)0)10100)U)(000 X 10 O 10 O , 10 O , 10 O -N-(0(00000040)0)40101010 , 10 O , 10 O , 10 O 0)0)0)0)0)0)0)0)0)0)0) 10 O 10 O 10 O 10 O 10 O Unit Time Period LO c0 N N N CO N N 29 30 31 32 CO 7 M CO 35 36 N CO M M 39 40 41 42 40 7 7 7 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 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 7175 N M 0 O O N 10 O O O r O O O 0 a- O O 0 0 N N O O 7 N N O O M N N CO O O M r co 7 O O r r 7 O O 0 r r 7 7 O 0 r r 7 7 0 0 O 2 S U N N N N I� O L C 7 (O t`CO t")(OOM (6Q6 00,,a,„ 0 CO Cs: h: M.- r- .- SCO (000 O N �0 c0 CO CO (O � CSi f, Q CD c4. vi (ON “! N (00000000 N MCO N N N 10010 N V N N V M N N Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft CO 7 o W 4) O D) o 0) co D) 0) 0 0O 0 0 104 108 010)0•1.0000 .- r CV 0) 0) 0) 0) CO 135 134 c') 7 10 0 h 0 0 0 0 0 0 0 M 0) In 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 CO 7 N cei. M O CO (OO M M 13,994 14,159 M 0 CO N 7 7 14,686 14,695 14,987 15,562 16,305 17,175 18,058 19,316 N a- M7 O 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 a- 16,702 20,396 OD e - CO (00 N N 20,665 20,630 20,554 20,459 0 E.I.0 O C j U CD CO O M M O f0 7 7 O 10101010 M 4) 7 7 n r 7 7 N O N 7 CO 00) 0) 0) I� T- N O7) I 0 T. nj ON ‘R".. 0 C ON n M OOOO 71 0 4) 7 Flood Hydrograph Flow cfs N M (O0 M 1.45 1.52 1.58 1.58 1.65 0.41 7 10 N V 5.75 6.98 M CO r O e4- N 0 O 0.40 0.33 0.20 _ 0.13 U'C s gQC W o 08 O 00 O8 OO OO OO W OO 0N OO OO OO MN OO 2 7,001 6 0 0 NE 0 0 00 OO Loss Rate in/hr Max I Low 0.26 0.27 N N 0 0 t00 0 0 0 M M 0 0 0.34 0.36 0.42 0.49 0.53 0.58 Cr 00 � O O 0.26 _ 0.12 O O O O 0.04 0.03 7 Ti 0 0 7 Ti 0 0 7 Ti 0 0 7 Ti 0 0 7 Ti 0 0 7 Ti 0 0 7 Ti 0 0 7 Ti 0 0 7 Ti 0 0 7 Ti 0 0 7 7 0 0 Storm Rain in/hr 0.31 0.33 MM O O 0.36 0.38 MM 0 0 704)0 0 0 0 0 0.64 0.69 rO 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 a- CJ 0.6 0.5 MN O O Time Minutes Hours N M CV M V 777 N 0 7 10 CO h- LOCO a a 1O CO r O a a 01 0 O O a 1C CO h- O a - 47 Lf 10 CO N M 47 Lf N 0 710 47104] CO h- LOO UP 10 CO I- O UP UP N O CMCD UP CO 4) 0 10 O N N 10 0 OI. N N 10 0 x000000 N N 10 0 N N 10 0 N CO 10 0 CO CO 10 0 N CO CO 10 0 NM CO CO 10 0 077 CO CO 10 0 LO100 CO CO 10 0 CO CO Unit Time Period 51 52 53 54 55 56 57 58 0O(D CO(ND 63 64 (00(00 67 _ 68 CON O^ nr EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 5 5 1 C U V C U V U V M rwNj 5 CO O O LOO CV ON c 0 N N � CO a0 1- z O W W N F W gg Q Q woo o o Z W W O O Q 0 00 LLO1D7coc BZW Z 0)W0000 -1 -'WW 5- W < OHce_N 0JLiWO000 00J 1-OJWW,WOQMOWL, 1iMCW7 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 OOOO OO 00000000000 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 W (O c 7 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft IO h (0 O l_ 0 0,010, 1_ r O 0 0,010101 0 0 N N (O (O N N (O (O N 47 (O W 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 (O N N M (O O) (O (O (O N N N V V N N N N V Uo N N N N 224 224 224 225 225 225 (n (O N N N N (n (O N N N N (n (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) CO 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 m ; U I 65 97 O O Ma, 0,m 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 n V „F 7 Volume In cu -ft 65 97 r O,_,_ O M O) 0, O CO O O CO CO N N m OO N N m OO 162 195 195 227 227 260 195 227 260 260 N N 0 0) N N (O (O N N M CO _ 325 357 390 422 487 487 520 552 617 649 682 714 r n O) CO CO a 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) CO 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 (O 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 M 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 O O O 0.027 0.027 n C.0 N CO O O O O CO CO 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 OOO CO m 0 0 0 0 m CO 0) 0 0 0 0 r- CD 0 7 0 0 0.134 0.134 0.143 0.152 Om OO N- O O 0.187 0.196 7O -m 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 co (� O 0 0.7 0.8 co (� 0 0 0.8 0.8 0 0 0 0 0 0 l T-,, 0 7 1.2 1.3 1.5 1.5 (O h - 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 m O N (OO Ns O O O Time Minutes M 45 60 n 0)O 1n O 135 150 165 180 0) 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(O Unit Time Period N M V „ m I_ m fP O 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 0) CO 33 34 N m 0) 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 amu) 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- O0 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 Lo (0 m0 M70M 1. 0 N M O r M 0 O) 0 (O IO N Up N O O O O N ` 7 M 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 0.021 458.0 ft 279,800 sf 459.0 ft 304,405 sf 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 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 0.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD HM201 217 AMA L°, bU °fid 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 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 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) 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) 1 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: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0064 0.0062 0.0154 0.3229 0 0 0 0 0 O O O N ,- N O 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% 11 L H H o 3i 'a, J J 11 J 2 C H Em� U O J y R N .. >-'R 0- U3 o 0' C O > y 0 m LL O LOW LOSS RATE PER RCFC/2322 O O O O co O_ O O 0.1000 0.6600 0.5800 0.5000 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED 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 - O AREA WEIGHTED AVERAGE 0.036 0.062 0.154 0.489 0.000 0.000 0.259 (1) W Ce 1.483 2.574 6.423 20.347 o o O O n 6 o 7 SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0(0 0 0 0 O C- 0 0 0 0 M O 0 N o O 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] o e 0 O) e 0 OD M o� 0 0 V 0 0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 0.51 0.51 0.51 .7(7) O RI NUMBER [Plate E-6.1] 0 0 0 0 0 0 0 0 0 CO 0 0 0 0 LAND USE COMMERCIAL PAVING/HARDSCAPE WATER FEATURE SF - LOW DENSITY SF - MEDIUM DENSITY SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL=. [I ULM SOIL GROUP [Plate C-1] 0)0)0)0)0)0)0) PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm 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 oO 10 C C N O O 0.33 0.47 0.63 0.82 1.05 1.36 O0I. 110 .-vi 3.79 3.89 02 C U 3,841 8,987 a0 M 0 CO 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 0000000000.0 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 W m M 05 N N 27,467 35,656 45,584 59,208 83,700 154,712 165,292 169,568 o E 5 z C 0 0 > 3,841 5,146 O N N O .6- 6,885 8,189 9,928 13,623 24,492 71,012 W O . N (5- _.,1- Flood Hydrograph Flow cfs 0 1000 N N-00 0 ON N m 0 1�M N N 0 7 N M 7 81.64 236.71 35.27 14.25 0) 0 C0)00777 U'01 L f .g(56 W M 7 0.44 0.48 0.55 0.65 Oc O,-.- (5,-.-666 000 6 0 0 Loss Rate in/hr Max 1 Low 0.53 0.62 .COMN.TM (56666 1.92 5.07 00. 66 N N M 0 66 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 Storm Rain in/hr N M 0 0-1-1-000).-700).-0 0 0 0 0 0 0 0 1� 0 0 ,- 0 0 0 N U) 0 0 .- O RCFC & WCD NIG1Gfl. IMIL 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) 3.6 4.2 4.4 4.6 0 0 1010 6.4 8.1 13.1 34.5 0- 0 0(0 Time Minutes Hours 0 0. -NM 0 0 N M 0 0 0.42 0.50 100-1010100 M O 0 0 n 00 0 0 m 0 0 u,oO (oN 25 30 35 40 45 50 55 _ 60 Unit Time Period N M 7 1[) O r W O) o'- N C C 10 C 10 10 O) 10 1 tel) 10 C O U .,,,,,.--..co. N U M U 100 ,- U N -M.-,00 0006N00 CO CO M N r4,9 M p 2 0- 0- o O N O 01 0 0 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 0 J W co 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 o t 6 C To N 0 0 O 0.02 0.04 co U 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 O � 1.39 1.52 1.66 Om @ Cch O 215 431 964 1,825 2,687 4,518 O M N N C NO O O O O) N. W r . 0 C 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 Basin Volume cu -ft 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 co T T I N 10 10 N N O (0 N 10 (0 0 O N N N CO0CON CO M CO W 862 1,831 1,831 862 1,185 1,831 M M Cr; M 3,123 2,477 4,415 4,738 3,769 4,738 CO O n CO (O CO- 5,384 5,707 6,030 Flood Hydrograph Flow cfs 0.72 0.72 1.78 2.87 2.87 6.10 2.87 6.10 6.10 2.87 LO N O0 M 6 10.41 10.41 ,- 7 N O O• 6 O 14.72 15.79 12.56 15.79 N N N 17.95 19.02 20.10 Effective Rain in/hr 0.02 0.02 O O O O 0.07 0.15 0.07 0.15 T 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 CO N N . O O 7 CO N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 10 C0 CO Cr, O O OD N 7 V O O 0.48 0.44 r CA 10 10 0 0 N CA 10 10 0 0 N N I� CO 0 0 M 10 OD CO CO CO 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 N N CO M O CJ 0.32 0.32 0.32 0.32 0.32 Storm Rain in/hr COO co O O 0.28 0.39 0.39 0.46 0.39 0.46 CO M COO O O 0.41 0.46 0.56 0.56 0.56 0.51 COO O O CO CCV OO O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD MUDDI3o©I1= Ctrl FACACME 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 co. T- 10 10 CO 1n CO 1.8 1.5 c0 CO T- T- N N N N 2.2 2.0 CO N- N N V r CV ('1 CO C7 CM 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 CV aj O CO 7 N CO 1.42 1.50 1.58 1.67 N CO 1.92 2.00 2.08 _ 5 10 15 20 N M OBD 35 40 45 50 55 60 65 70 75 80 00l O Off)CD _ 105 110 10 O 10 T- T- T- Unit Time Period N CO 10 40 r-- CO O , N, Mr 15 16 CO 19 20 21 22 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 C J W co 458.28 458.32 458.35 458.41 458.48 458.55 458.60 458.61 458.62 458.63 458.63 w U 0 C N co (O co. N 2.33 2.74 3.19 3.71 (O O V V 4.15 4.19 4.20 Om @ co 0 0 M M Oi 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 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 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 286,695 287,721 CO CO CO V/ CO W W 0) W W N N 291,504 293,400 294,671 294,879 295,034 295,188 295,212 Basin Volume cu -ft _ 81,835 94,003 101,326 119,309 138,907 161,413 176,489 178,965 O N N- O) N 0 o(ID rn O N N CO CO OD o 2- 0 j U 9,584 12,168 M M 0' r 19,598 22,506 15,076 2,477 co co O ,— , Flood Hydrograph Flow cfs 31.95 40.56 24.41 59.94 65.33 75.02 N co O Lo CDN. O O D O Effective Rain in/hr co N. r O) 0 0 0.58 1.43 CO 0, (O I- 1.20 0.20 0.15 0.15 0.02 Loss Rate in/hr Max 1 Low rn C o.— N 1 o.—.—.— 41 F- 1.29 0.44 co M s- 0 0 0 CV M M M 0 0 0.32 0.32 0.32 0.32 0.32 0.32 COMCO O co, O Storm Rain in/hr co co o N0) c- o (On, n O ,— - oD,— ,— N 1.52 0.51 0.46 0.46 0.15 RCFC & WCD MU oDI o©I1= Ctrl FACACME 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) N O V N 3.5 6.8 MN I.— - co 5.9 2.0 OD CO(O �O Time Minutes Hours N N N M V N N 2.50 2.58 2.67 2.75 W m 0 N N M O co co M 140 _ 145 150 _ 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 N M M M 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Cmh 'IT U U C U U U U M U MN M VD O N N O) N O) OD O U O "COO‘- 7 7 r O PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm yW 0 m(o 4 m> 458.00 458.00 458.00 458.00 0 a0 CO 7 7 0 0 a0 CO 7 7 0 0 a0 CO 7 7 N CV 0 0 a0 CO 7 7 N CV 0 0 a0 CO 7 7 458.02 458.02 458.03 458.03 458.03 458.03 458.03 458.03 O O a0 W 7 7 5 '113 C C N 0.01 0.02 0.02 0.03 0.04 0.05 CO O O O CO O O O 0.10 0.11 0.12 0.14 0.15 0.16 S CO O O S N O O 0.22 0.23 0.24 0.25 ON m U N 00 �� N 1� (OM O70ON I. N. N O 1O00N I. (V 1` ' (OM N M N O 1000)0) 1007 M 7 ` t` t;'5 W V 7�0 1,',:i1` 0)0) 00 t` 1` MM CO (O (O t` 1` MM �0) t` t` ` 1• t',,-5 MM CO0) CO CO 1• t` MM V O Cr, Cr, M N V O) 0 0 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 279,826 279,858 279,890 279,921 279,953 279,990 280,026 280,063 280,100 280,137 280,174 280,216 280,258 280,300 280,342 280,385 280,427 _ 280,469 280,511 _ 280,553 280,595 _ 280,637 280,679 f 280,727 C N 5 10 0 J W LO ; U N r W (h 0N N t` Om O V N o co co_N r 10 00 N co_—N07O7O7 N M N 0 OO M V h 1� co co 7 V r t` co co IO 1O r t` (hM O) (O 0 I� 1- co co Mt a". r I� 1- co co Mt a". CO CO I� 1- co co Mt a". Cr, 0 0) M0) 710) 0 0 0) E 5 O U — J 312 375 375 375 375 437 437 437 437 437 437 500 500 500 500 500 500 500 500 500 500 500 500 562 Flood Hydrograph Flow cfs 1.04 1.25 10 1O C4 N 1.25 1.46 1.46 1.46 1.46 1.46 1.46 1.67 r r 00 r r- 0 0 r r- 0 0 r N- 0 0 I,- N- 0 0 I,- N - 0 0 m- ) g,' C U '(p L g Q' 5 W N(0(0(0(0(0(0(0(0(0(0 000000000000000000000000 0 0 0 0 0 0 0 0 0 0 7 0 0 7 7 0 0 7 a 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 10 I- 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 CO CO N N O O CO CO N N O O CO CO N N O O CO 0 N N O O CSI CO 0 0 ('((‚4 0 0 ('((‚4 0 0 ('((‚4 0 0 ('((‚4 0 0 ('((‚4 . . 0 0 ('((‚4 . . 0 0 (‚((‚4 0 0 M CO 0 0 ('40.1040.10404 0 0 0 0 0 0 Storm Rain in/hr T- 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 MUDDI3o©I1= Ctrl 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 (0 (1) U IL N a a m 0 O (O O CD (O (O O CD (O 1- O CD t` 1- O CD t` 1- O CD t` 0 O CD a0 (0 O CD a0 c0 O CJ 00 c0 O CJ 00 c0 O CJ 00 c0 O CJ 00 0 O CJ Time Minutes Hours 0L- O O 0.25 0.33 0.42 0.50 10O((0 O O 0.75 0.83 0)007 O NM 1.42 1.50 1.58 1.67 1.75 1.83 MEM 2.00 O O I0 O N I0 O N M N O (0 a N O s (0 N O (0 (0 I0 O (0 1- I0 O r 0 I0 O CO 0) I0 C 0) co 0 0 co 10 0 Unit Time Period I N CO V0 O r 0 0 0,_ N,- 7 15 16 CO 0) O N N N N M V N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm 0 W m w 0 CO 0 0co Lo 7 458.04 458.05 458.05 458.05 458.05 458.05 458.05 458.05 458.05 458.06 458.06 458.06 458.06 458.06 458.07 458.07 458.08 458.08 458.09 458.10 458.11 458.12 et CO CO V 7 0 U 0 C C N 0 CO N N 0 0 O) O N M 0 0 N CO M M 0 0 V M M M 0 0 (D 0 M M 0 0 1` r M M 0 0 CO 0) M M 0 0 O N V V 0 0 V I- V V 0 0 N 0 LO O 0 0 c- 0 CO (O 0 0 N CO r 1` 0 0 CO V CO O) 0 0 0 0 0 0 j 0 0) N 0) (O V 00.-1—M --(V I N V 1) N (0 NM I N 0) N V ,- Mmur(0 V n 1— co 0 V �(n N 0) .- .— 0 0001.— 0) O I N co (0 03 CO 0) (O I N CO 0 e)o, (0(O I N 0 7 7 LOv— r W I N 00 ON) O4N OiO I N ,- W N V(6 N N N N NCO a N N O(0 LO v— 71)0 M cv W 00) N I- CO V Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 0 0 O 0 O 0 O 0 O 0 O 0 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 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C .@ N V a N 0 0 O O O I� 0 0 0) 0 N N V T- (O co_ 0 0 0 0 N N CO (O N O O)OO 0 0 0 N N CO 0 N O _• 0 0 N N 0 (0r T- M 0 0 N N N et (O _ _7.N 0 0 N N r 0 h N 0 0 N N CO 0 h N NM 0 0 N N V (D CO V (D 0 0 N N a O V (O CO 0 0 N N m CO CO N ON N N 0 0 N N V 0(0 N 0 Ti-- (O N N 0 0 N N CO V co W N N M 0 0 N N Basin Volume cu -ft 11.499 12,062 V 1� N0 0 _ _ N M - � 13,749 14,312 V 1� (-(000)(0t(0 COV _ _ - Ln � O) (O CO0) _ _ M Ln � � co L) _ _ M 0 � � CO 0 CO0) _ _ (O 0 � � 17,545 18,144 19,160 20,592 I. O 7011)N N _ _ N V N N 0 O N CON _ _ 0 0 N N N O 00 _ ,.- CO CO MEM 40,798 a) E w . C j 15 U O N 00000 (n Ln N N M Ln N N (O0 M Ln N N (00000000) M Ln N N N N N 0) Ln O) 0 0)0) 0 LL) N N M Oa X W d1 V V 000 X N O (D O NN N N N N 0 0 O0O N N W O 0 (n M Flood Hydrograph Flow cfs 1.67 _ 1.87 1.87 1.87 1.87 1.87 1.87 1.87 00 0 0 00 0 O 0O O N OO N N 3.38 4.77 00 0 (O 7.55 7.55 8.94 8.94 11.72 U 'C s QC W V V 0 0 V V 0 0 V V 0 0 V V 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0 0 0 2 2 0 0 0 0 0 0 N N 0 0 N 0N 0 0 Loss Rate in/hr Max 1 Low 0.23 0.25 (D 0 N N . O O6 (D 0 N N O6 (D 0 N N O6 0 0 N N O6 0 0 N N O6 0 N COCOCOCOCOVV O6 O6 0.34 _ 0.37 O 0 O6 N N O6 0.45 _ 0.45 0 V 0 . 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 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 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 GOO oDD o@E Ctrl f�t1G1 ItW111� 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% T C C (0 112 V W 75 (( o_ a a m 0 m 0) 0 0 0)00)00)00000077. 0 0 0 0 0 0 T- T- T- T- T- T- 7 T- T- NM T- T- V V T- T- N W. T- T- O(01 T- T- -O 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 (6 M 3.42 3.50 3.58 3.67 r CO (6 M 3.92 4.00 4.08 4.17 0 O N CO X LO O M,r LO O el. LO , (0 O LO 0 , (0 O co 1- , (0 O r 0 , (0 O CO 0) , (0 O O) O N (0 O O N N (0 O N N N (0 O N M N N (0 O M V N N (0 O V LO N N Unit Time Period (n (O N N 1) CO N N 29 30 31 32 M V CO CO 35 36 r CO CO CO 39 40 41 42 CO V V V 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm W 0 (0 w m 458.15 458.17 a00 N (0 6 (O (0 7 7 N7 NN (0 6 (O (0 7 7 458.26 458.28 ON MM (0 6 (O (O 7 7 458.35 458.39 MCO 7700 (0 CO (O (O 4'1.44 MO (0 W (O IO 458.61 458.62 NN CO CD 6 CO N IO 7 7 458.62 458.62 (0 0 @,-,-,-,- ; C 7175 N CO CO O 7 7 10 NM (O CO 7(O 0) 0- 0, N r O N N CO CO.-- COm- CO N N N CV COO N M CO CO (O M 7 N CO N. 7 7 c0 4 4 7 7 0 (O 7 7 15 6 H m C ,7,,,...0; O 0) M1,, I� 7 7�� V 0 70000, (0(O d) W O (00770010 M 6 co 0 0 O N o7 t` W N 0 (O0 )` 7 a0 0 N r M 7 CO(O M7 O`- N r N 07OM (00 N (O M N 0- (06000000 Ns (O 1. 0 (O M W N" Ns N IO N 10 N a0 CO N 0. N t0 0- CO a0 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 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 Percolation Area sf 283,569 283,935 284,337 284,738 285,175 285,647 7 0 N CD CD 6 0 W 00 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 00 (00 (00 0- CO 00 (00 75,405 81,420 CONn 0CO7) 103,632 114,647 126,912 140,427 156,025 175,373 179,305 179,867 N 14 00000 180,742 180,867 . C 15 U N 0 M 7 0 co M 7 (O (0) O O 10 1- 7 7 N 0 W 0 .- (n (O (O (0 (0) 0 0 6 0 N CO M 7 7 00 O O N(0 M 0 0 W O(0 O N (O , M 00 0 (O M ,, N co N 0 (0 CO 0 Ln N r M M 0- Ln co csi Flood Hydrograph Flow cfs 00 �� CO CO 17.27 18.66 20.05 20.05 7 CO N N N 29.77 36.72 40.88 45.05 Cr O 3�'- n 0 1.25 1.04 0.62 0.42 0) > C ) ec s � Q' C W to M MMM 0 0 W 0 0 0 (O 7777 0 0 W 0 0 0 7 (O (O 0 0 0 10 C000 0 0 1` 18 0 ..- 7 7 N (n .- ..- 7 600000 0 0 M N 0 0 0 0 Loss Rate in/hr Max 1 Low 0.53 0.56 0.59 0.59 N 0 (O (O 0 0 CO CO (O (O 0 0 O CO 10 10 0 0 0.87 1.01 O CO N. N. N N— N CO CO 0 — CO 0 0 N O O 0.17 _ 0.14 CO (O O O O O N (01 00 CO o O N N MM OO N N MM OO N N MM OO N N 0)M OO N N 0)M OO N N 0)M OO N N 0)M 6 c N N 0)M 6 c N N MM 6 c N N MM 00 Storm Rain in/hr CO ((0 C60 0 0 O 0.O 0 0.- 0.73 0.76 0.79 0.79 0.83 0.86 O 0) N M 1.56 1.85 CO6CO CD O O 0.20 0.17 O- 0 O O RCFC & WCD GOO oDD o@E Ctrl NIG3MML \E 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) 0) 0' N NN 2.2 2.3 7 7 N N 2.5 _ 2.6 3.1 3.6 3.9 4.2 4.7 5.6 00 ,-6 0.6 0.5 MN OO Time Minutes Hours (O CO N CO N 0 7 (0 W r N o N CO r W N 0 CO 0 CO 0- 0N- (O CO N CO N 0 7 10 CO r (O (0 (O CO 10 CO N O 0 0 (n O (O CO N N 0) O CO 10 N N 0) O 10 0 N N 0) 0 CO 0 N N 0) 0 0 0 N CO 0) 0 0 CO CO 0) 0 N CO CO 0) 0 N CO CO CO 0) 0 7 CO6 CO 0) 0 7 (0 CO CO (O 0 (O (O CO CO Unit Time Period 51 52 53 54 55 56 57 58 0(0 D CD CD 63 64 C C0(00 67 _ 68 CO(0O ^ nr EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY U U C U U U U N U C E (O M COO (01` N10 (O 0 8rN�a0ra00� N -N 7c7 7 (70OO 1- z 0 W W F 00 ig J 7 Z W W W OU m00 a J LLO(O'77coc �Z W J CO j O O w w w O m W a0~00Ce WW -1 Z J O 7 7 —LLood30.¢QW i-Kcnw(Ji(DiceKMai-Q PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm O J W CO 458.00 458.00 458.00 I 458.00 I 458.01 458.01 458.01 458.01 458.01 458.01 458.01 458.01 458.02 458.02 458.02 458.02 458.02 458.03 458.03 458.03 458.03 458.04 458.04 458.04 458.04 458.05 458.05 458.05 458.06 458.06 458.07 458.07 458.08 458.08 458.09 458.09 458.10 458.10 458.10 458.11 458.11 I 458.12 458.12 Total In Basin cu -ft 1 ac -ft 0N 0000 C O O c) O O 0.03 0.04 0 (D 00000 0 0 I,- COO) 0 0 O 0 0 0.11 0.12 CO 10(O 0 0 CO 0 0 0) ,- N 0 0 0.22 0.24 0.26 0.28 O N CO O O 0.34 0.36 a) COLO O O 0.44 0.47 0.50 0.54 CO CO 0 0 0(O <0 CO 0 0 0) CO O 1,- 0 0 OM 00 0 0 0 200 499 0 01 L- 1,498 1,797 2,097 2,496 2,896 3,295 3,795 4,294 4,793 5,293 5,792 6,391 W (00 0 t` CO L- 0 d) 9,786 10,485 11,284 12,083 12,982 13,880 14,879 15,878 CO 0) 19,173 20,471 21,969 23,467 25,064 26,762 28,659 28,919 30,031 31,994 33,492 34,989 36,164 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 O O O O O O O O O O O O O O O O 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 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% c O @ (C 0 O Q N O !L 279,817 279,842 279,867 279,901 279,926 279,951 279,977 280,010 280,044 280,078 280,120 280,162 280,204 280,246 280,288 280,338 280,389 280,448 280,507 280,574 280,625 280,683 280,751 280,818 280,894 280,970 281,054 281,138 281,222 281,315 281,415 281,525 281,651 281,777 281,912 282,055 282,215 282,237 282,330 282,496 282,622 282,748 282,847 C O N E (p O m; O 200 499 CO 0) a) Cr) r CO r rn a)a) 7 r x- 2,097 2,496 2,896 3,295 3,795 4,294 co a) a)rn n N 7 (O 5,792 6,391 O a) W CO (0 0 r CO 1 CO W M 0 0) 9,786 10,485 11,284 12,083 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 36,164 Volume In cu -ft 200 300 _ 300 399 300 300 300 399 CD a) 0) a) CO CO(O 499 499 499 499 499 599 a) 0) a) 0) CO a) 0) a) 0) (O N- a) 0) a) 0) N CO a) 0) a) 0) n n a) 0) a) 0) CO 0 a) 0) a) 0) a) 0) a) aO) a) 0 a) 0, aO) x- N 1,498 1,498 1,598 1,698 0, 0L- CO 0 N (MO L- a) CO CD 0O) LC) M. 7 L - Flood Hydrograph Flow cfs NM N CO O O 0.33 0.44 0.33 0.33 0.33 0.44 0.44 0.44 0.55 0.55 0.55 0.55 0.55 0.67 0.67 0.78 0.78 0.89 1` O0) CO 1 0 0 01 0 CO 0 0,_ 1.00 1.00 T- N T- N M7 M 7 T- T- CO CO 0 (O T- T- 1.78 1.89 T- 0170(O T- N N O N,— N (O� 0 (O Effective Rain in/hr O O O O 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 N N O O O O N N O O O O N N O O O O N N O O O O M CO O O O O M M O O O O M M O O O O 0.04 0.04 0.04 0.04 NO T- O O O O 0.03 0.05 Cr Cr M 0 0 0 O O O Loss Rate in/hr Max 1 Low O (O M 7 O O O O 0.045 0.060 0.045 0.045 0.045 0.060 0) 0 00 0) 0 O O _ 0.075 0.075 0.075 0.075 0.075 0.090 O (O a) OO_ O 0 0 (O O Na) 0 0 O (O O O 0 0 0.120 0.120 0.135 0.135 O O (O (O(0) 0 0 O (O 0_0 0 0 O (O 0) 0 0 0.225 0.225 0.240 0.255 (O O 00 CV CO O O 0.315 0.330 (O (O O N NO N N M 0 0 0 0.559 0.553 0.546 0.540 0.534 0.527 0.521 0.515 0.508 0.502 0.496 0.490 0.484 0.478 0.472 0.466 0.460 0.454 7 � 7 7 O O 0.437 0.431 0.426 0.420 0.414 0.409 0.403 0.398 _ 0.392 0.387 0.382 0.377 0.371 0.366 0.361 0.356 0.351 0.346 0.341 0.336 M N N M CO M O O O Storm Rain in/hr 0.035 0.053 0.053 _ 0.071 0.053 0.053 0.053 0.071 0.071 0.071 0.088 0.088 0.088 0.088 00 CO 0 O O O 0.106 0.123 0.123 0.141 0.106 0.123 0.141 0.141 CO 0)00(0 N 0 0 0 n N- 0 0 n 0) 0 0 0.212 0.229 0.265 0.265 0.282 0.300 0.335 0.353 0.370 0.388 10 OM CD N CO M O O O RCFC & WCD FAzamaL 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 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 0 1-- O O 0.7 0.8 co 1� O O 0.8 0.8 0•00•Q0• 0 0 T- TT. 7 T- T- 1.2 1.3 1.5 1.5 0 h T- T- 1.9 2.0 N- N N N 0 0 O T- T- N O 2 0.25 0.50 (O O h 0 0) Y- 1.25 1.50 1.75 2.00 2.25 2.50 0 0 N. O N M 0 0 N 0 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 UD O h 0 N 0 8.25 8.50 N O h 0 c0) D) 9.25 9.50 N O h a) O N (OO n O O O Time Minutes C- M 45 60 n CO0 0 0) O T- 135 150 165 180 0 0) Q) 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 1n O N CO Cr 0 0 0 Unit Time Period T- N co V 0 0 r 0 O) O T- Cq CO Cr UD 0N 17 18 19 20 N N CO 7 N N 25 26 27 28 29 _ 30 7 N M CD 33 34 N 0 M CD 37 38 39 40 7 N M 7 7 7 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm Dm 0W V 00 OD 7 V 458.13 458.14 458.14 458.16 458.18 458.21 458.24 458.28 458.32 458.34 458.36 458.39 458.41 458.44 458.47 458.49 458.51 458.52 458.54 458.54 458.54 458.54 458.54 458.54 458.54 458.55 458.55 458.55 458.55 458.55 458.55 458.55 458.55 458.56 458.56 458.56 458.56 458.56 458.56 458.56 458.56 Total In Basin cu -ft ac -ft 0.86 0.88 O7 0) 0) . 0 0 CO 0) 0) O 0 1.23 1.41 0) CO CO ,. s. 2.18 2.30 N 7 CO N N 2.78 2.96 3.13 3.28 NN 7 (n M M 3.60 3.60 CO (D M M 3.63 3.64 3.65 3.66 3.67 3.68 3.69 3.70 O Ns Ns M M 3.72 3.72 3.73 3.74 3.74 3.75 Li, CO h Ns Ns h M M M 37,517 38,380 39,416 41,114 41,827 47,368 N 7 T- N- CO M 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 C E w 0 37,517 38,380 39,416 41,114 41,827 47,368 V T- r- al 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 0 V CV OD N V V CV V r 163,023 163,323 163,523 163,822 164,022 Volume In cu -ft N CO C1 O CO 1,037 1,698 713 5,541 6,373 7,869 0 Or) O CD.(O W 12,345 5,178 5,332 8,147 M N- N- r 7,259 6,737 6,213 3,689 N 0) O 0) M co 0) 0 0) 0 CO CO 300 499 499 499 0) 0) 0) 0) CO CO 0) 0 0) 0 CO CO 200 300 0) 0 0) 0 CO CO 200 300 300 300 0 0 0 O 0 0 N CO N Flood Hydrograph Flow cfs 0000)0) 0 0 O- N CO - O I CJ (O _ 7.08 8.74 _ 9.66 13.54 _ 13.72 5.75 _ 5.92 9.05 _ 8.48 8.64 (- 01 O 7 GD I: O O 0) T- (O V (O7 N 7 V 0 V M V M 0 0 0.33 0.55 0.55 0.55 a 7 a 7 O O 0.44 0.33 N M N M O O 0.44 0.33 N MM N M 0 0 M M M 0 0 N MN N M N 0 0 0 Effective Rain in/hr 0.04 0.02 co 7 O O O 0 N O O 0 0.17 0.21 0.23 0.32 0.33 0.14 N N O 0 0.20 0.21 0) CO O 0 CO 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 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max I Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 O LO V 0 co O O 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 CO0 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 OD M O O O 0 0 0 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 7 M N N O O 0.234 0.230 0.227 0.223 N r 00) N N O O 0.213 0.210 _ 0.207 0.204 0.201 0.198 00) O O 0.190 0.187 0.185 0.182 0.180 0.178 Ns CO 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 (O O O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 0.335 0.071 n (M 0 0 O O 0.053 0.088 0.088 0.088 0.071 _ 0.071 r- (M 0 0 O O 0.035 0.053 0.071 0.053 0.035 0.053 0.053 0.053 M (M M 0 0 0 O O O RCFC & WCD FAzamaL 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) O W N r 0) I- r r co. 0 r N O CO N N 2.9 3.4 V CO M N CO 1- N N 2.6 2.6 (O V N N 2.3 1.9 0) V , 0 V CO 0 0 0.3 0.5 0.5 0.5 _ 0.4 0.4 0.4 0.3 0.2 0.3 7 CO O O 0.2 0.3 0.3 0.3 Cl CO N O O O 12 O 2 O (O O N • T- 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 0 O O N ,i 7 N 14.50 14.75 0 O O N 0 0 N 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 0 0 0 O N 0 N N N Time Minutes COONs CO O 690 705 720 735 750 765 780 795 810 825 840 855 870 885 0 0 (00 0) 0) 930 945 n 0) 0) 0 O 0) O 1020 1035 N (00 0 0 _ 1080 1095 1110 1125 1140 1155 1170 1185 1200 1215 1230 1245 (00 001 Unit Time Period 44 45 46 47 48 49 50 51 N co 0 0 V O 0 0 56 57 O0)O 0 0 0 0 N CO 0 0 64 65 OI.O 0 0 O) 0 0 LL OL N M I� r 74 75 0(-00)0 h F. h F. CO 00 82 83 V 0 0 CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm c J .y wca m5 458.56-1 458.56 458.56 458.57 458.57 458.57 I L 458.57 458.57 458.57 458.57 Total In Basin cu -ft ac -ft 3.77 3.78 1,m W W W W W M M M M M M M N 164,521 164,821 165,020 165,220 165,420 165,620 165,819 166,019 166,219 07W 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 0 293,662 293,688 293,704 293,721 293,738 293,755 293,772 293,789 293,805 M O N T - 165,020 165,220 165,420 165,620 165,819 166,019 166,219 CN 0 M N N N W T Volume In cu -ft 300 200 300 200 200 200 200 O O O O O O N N N Flood Hydrograph Flow cfs M N M 0.22 0.22 0.22 0.22 N N N 666 OOO Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 6666666666 Loss Rate in/hr Max Low r 0.045 0.030 0.045 0.030 0.030 0.030 0.030 000 M M M 000 O O O O W (O W M N 0 O) W I� W W W W W W W W W 0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr 0.053 M IM 0.035 0.035 0.035 0.035 M M M 00 000 O O 0 0 0 RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z 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) M 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 W h- o M M v M ('4(0(0 Time Minutes 1305 1320 1335 1350 1365 00000 (00) _ N V M M V V V Unit Time Period 87 88 89 O N M 7 00 W 0)0)0)0)0)0)0) EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY .E.U C ) U V U LA V= E N O O N O N 0) W N 0 V n 0 O N O N 00 W N. 0 0 0M M W M W O Z 0 ww co w~ W 00 c J. Z W w OW oW0 F Q LOO LLOWm7Otjw ZW a'_tV �jOOWWwOQw <01— CeCe —ILL -1000--1.2 J - -1 O _ X� O< O LLw W Q W O> F W W W LLLL2LL'2dFQ 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�Ei—E2)(Ai+A2+VA1A2 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 March 30, 2020 DLS 1 CORAL MOUNTAIN 2553 BASIN C DA -C 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 5 B 6 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 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 452.0 ft 25,035 sf 453.0 ft 28,965 sf 454.0 ft 33,060 sf 1.0 in/hr Data Input Sheet Page 1 of 13 RCFC & WCD HM201 217 IVtEL1°. GSM °�. 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 79,166 33,734 BASIN C [2] AREA DESIGNATION EFFECTIVE RAIN (in) DA -C [3] AREA - ACRES 1.21 10.191 [4] L -FEET 41,768 0.96 1350 [5] L -MILES 41,485 0.95 0.256 [6] La -FEET 39,121 0.90 1.48 675.00 [7] La -MILES STORAGE PROVIDED (cu -ft) (acre -ft) 0.128 [8] ELEVATION OF HEADWATER n/a 464 [9] ELEVATION OF CONCENTRATION POINT 3.41 455 [10] H -FEET 453.39 1.39 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 1.1 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) 53,271 11,503 79,166 33,734 102,102 57,155 163,141 121,656 EFFECTIVE RAIN (in) 1.13 1.23 1.21 1.12 FLOOD VOLUME (cu -ft) (acre -ft) 41,768 0.96 45,432 1.04 44,947 1.03 41,485 0.95 REQUIRED STORAGE (cu -ft) (acre -ft) FACTOR OF SAFETY 39,500 0.91 1.47 39,121 0.90 1.48 34,975 0.80 1.66 19,901 0.46 2.91 STORAGE PROVIDED (cu -ft) (acre -ft) _ 57,966 1.33 PEAK FLOW (cfs) n/a 18.44 15.86 3.41 MAXIMUM WSEL (ft) DEPTH (ft) 453.40 1.40 453.39 1.39 453.26 1.26 452.74 0.74 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) 0.8 0.9 1.1 1.1 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: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0143 0.2329 CD LO 0 0 0 N O O 0.5530 -HOUR STORM ONLY) NOTE: Low Toss rates established per RCFC/2322 (Dated: May -30-95) For 10 Year Storms or Less 0.00288 (24-(T/60))^1.55 + 0.16 in/hr Undeveloped Condition: Low Loss = 90% 11 L H 0 o J 11 J E H ° J m O J y !6 U w N C 0- i5 d C 0 Y > y G COIOL co- LOW LOSS RATE PER RCFC/2322 0.1000 0.5800 0.5000 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED DEVELOPED 1 MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0073 0.1311 0.0594 0.1132 0.3109 AREA WEIGHTED AVERAGE 0.143 0.402 CS1 't N N O O 2 D WLO Q LO m V o ,- v 2.159 2.485 rn o SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC 11 ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.33 0.28 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] o 0 0� o 0 LO x- PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 0.51 RI NUMBER [Plate E-6.1] 0 CO L L CO CO L L LAND USE PAVING/HARDSCAPE SF - MEDIUM DENSITY SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL=. [I ULM SOIL GROUP [Plate C-1] 0)0)0)0) 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 _ 452.03 452.07 452.11 452.16 452.22 452.29 452.37 452.49 452.71 453.30 453.38 453.40 c 0 C 0.02 0.04 0--,-0M 0 0 0 0 0 0 0.44 0.83 0.89 0.91 N F 4i 0 U 784 1,887 3,095 4,409 0) n ton to A 10,043 13,212 19,039 36,249 38,647 39,500 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 175 176 177 178 180 182 184 187 co O 0) N 212 213 175 176 177 178 180 182 184 187 193 210 212 213 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 25,175 25,336 25,512 25,703 0 0 0) .- i0 00 0000 0 0 (0 D) 0 27,837 30,218 CO a N 0 00 CO CO Basin Volume cu -ft 959 2,063 CO CO N . M V CO .- LO .- W CO n 10,227 13,399 N OD N a m M 38,859 39,713 0) E x 2 C 0 U rn cD N O 1,385 1,492 1,705 2,025 2,451 3,356 6,020 17,420 .- m co O N.- Flood Hydrograph Flow cfs 3.20 _ 4.26 4.62 4.97 5.68 6.75 8.17 11.19 20.07 58.07 _ 8.70 3.55 ) ? C0 U 5 t o C W ch V 66 0.45 0.48 0.55 0.66 0) n 0 O 1.95 5.65 0.85 0.35 Loss Rate in/hr Max 1 Low 0.53 0.62 tLO O CCD 66666 CO W m CA 1.92 5.07 CO N 66 666666666666 Storm Rain in/hr 01000/01,-,-00000 CO n 666666 n n W 0) .- a ., .- N 0) N lD .- 0 N-6 RCFC & WCD G 7DGi0O1. Wf NIG1Gfl. IMIL DRAINAGE AREA -ACRES 10.19 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 0.31 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 3.6 4.2 4.4 4.6 oco 0)6 6.4 8.1 13.1 34.5 n0 6O Time Minutes Hours ON- O 6666 N co N m 0.42 0.50 co n LO CD 00000 NMN n CO O CD 0 O oO LO N 25 30 35 40 45 50 55 _ 60 Unit Time Period N- N <n V lD 0 n W 0° N C C ( .=x(0 5 ,finC C U U U 0 M 0 0 0 V n U 2-0'T O N O m Q N N O n N a N N 2 N V CO CO W E 7 J > W G Q O W O z J 0 LL W W W ~ Z W U' U` W 1 J R J z W W O O '- O O O Z LU f2J_>WWW<W �> W Q LL O W O O» Y Q W r Z J LL O O 0 0 X Q F W W 0 (0 O W LLL (0 (0 M 0 1- Q CORAL MOUNTAIN CO N O N N N cc ccO C N o N C' U U o a ❑ N ci__ n00 m= �m 5 2, m m Z ❑ 10 O v O LO O v O 10 O V (V 10 O v O 10 O v 10 O v O 10 co v O O v v v (V V N LO CO v M LO co v ✓ LO v ry E N 0 W O N(0 N Cl. = CO CO CO d V 5 N O O O O O O O O O O 0 O O O CO O co CO O O co O co co O O M O O O N 0 N O CO O 0) O CO O O O O O 0 a co a OD r O CO CO O O N 0 N 0 M M co C) M 10 10 O V N.: M (0 CO O N M co (V N M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 2 0 z 0 J U U Z_ E K W Q > K 7 W Q • W M W (0 re2 a 0 ce >- } 1- Z 7 C O U O N 0 n 0- 10 0- r 0- r n r n (0 r 0- co w CO 00 CO CO co 0 N- 00 CO 0- 0- n 0- n 0- n 0 - 0- n O n 0- m 0m O m CO m ro m ro 0 O d U Q G) 0 O O N 10 O O N a O O N (o co O N co O O N O O N n O N O co O N N O N O N O N O CO O N N CO O N O co O N O 7 N n N O N N O N O 10 O N N co O N M O O N O 10 O N M co O N a O O N N 0- O N 0) O N c N E 5 J m ; r 1- M N CO 0) CO CO O N CO N 7 O co N 00) N co L0 co CO 0)) M W V W O (0 O 1- L0 O V O N N N 10 a) EOOOOO (OO GOO MM co O p0. 0) NO MOOD) 7'^ M N N O NOON O (" O GO N V- (O V M V V U N N 7 N 7 V N M 7 1� r n O O Flood Hydrograph Flow cfs N N 7 N. 0.76 1.55 0.76 1.55 LID (JD 1 1.03 1.55 O O 2.61 2.08 3.67 3.93 T- CO 10 m 4.46 4.72 4.99 O O O O O N N M M 10 V 0 O 0 O 0 0 O 0 10 O 0 10 O LO r-- 0 10 O LO 0 N O LO O N O co co O co O O co O 00 O N O M 0 N O <7. N O M 0 CO O <7. co O M 0 M O <7. co O M 0 M O <7. co O M 0 CO O <7. co O M 0 M O <7. 7 O M 0 oo O <7. 7 O M 0 V O M O M O M O O O M O 0) O M O 0) O M O 0 O M O (0o O M O CO O M O 10 (0 O M O OD O M O E C r O C CO M CO O CO O M O M O co (0 O M O co (0 O CD (0 O M O 7 O co (0 O N O (0 O N O 10 O co O 0) O CO O 0) O co O O O 0 O 0 O 0 coO 0t M c O O 7 L0 LO W O c6 N Z < L Z 2.=_w w O O W ix = Z W — C?w()O Q � d ❑ J O• W2Q¢0 Z�J.70=O z O O O ❑ H U M M O O O O O O O O O N (V N N N N N M 0 O 2 E 1- 0 0 0 0 0 0 0 0 O 0 0 o N M 40] O M 0 O CO CD N O O LO N N CO M a LO LO 100 N (0 O O LO W O 0) O 0 LO a) E Y 0 0 ?a N V O O r O O O N M 7 N co 0- O O O N N 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 C J W COCO CO 452.60 452.70 452.76 452.92 453.08 453.25 453.36 453.38 453.38 453.39 453.39 U 0 C To N 0.37 0.43 0.47 0.57 0.67 0.80 0.88 0.89 01 Co 0 O O 0 O O O Om @ C 0 O 16,108 18,914 N CO N - C N N VD 0) COO 0 N CO 38,200 38,613 38,867 39,121 38,980 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 190 193 LID 0)7 0) 0) -'- CO O O N N 212 212 212 212 212 190 193 (O C) C1 0 204 208 N N N N NNN N N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 7227,409 7,819 28,055 28,671 29,309 30,013 30,476 30,531 30,564 30,598 30,579 Basin Volume cu -ft 16,298 19,108 20,727 24,957 29,578 34,908 — ..0 N 7 W W W M CO 39,079 39,333 39,192 ON E 0 U 2,366 I 3,000 o N W V ,— V M N M co to V (C N o h N M O 466 466 71 Flood Hydrograph Flow cfs co O r O 6.04 14.75 O V (0 G 12.37 2.08 1.55 1.55 0.24 Effective Rain in/hr r N. 0 0 6 0 0 0.59 1.44 (1) 0, N 1'- .— . 1.20 0.20 0.15 0.15 0.02 Loss Rate in/hr Max 1 Low 0N) O O' CO V 0 N— h m N— 1.29 0.44 M CO0s- 0 0 0 0.31 0.31 M M 0 0 M M 0 0 M M 0 0 M M M 0 0 0 Storm Rain in/hr co co 0 Cy c- o (0 CD n(ON— O .— 0 ,- ,— N 1.52 0.51 0.46 0.46 0.15 RCFC & WCD MU oDI o©I1= Ctrl FACACME DRAINAGE AREA -ACRES 10.19 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) 0.31 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) N O V N 3.5 6.8 CO N 0 co 5.9 2.0 W CO (0 ,_,_ O Time Minutes Hours N N N CO V N N 2.50 2.58 2.67 2.75 W 0 Co N N M O N CO CO 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 0 0 . 0 0 0 0 0 0 pg 7t8 AM M� Nr 0? 0 (O N O 0 0 7 M O M W O W W (n 00LU LL1 Q 0) 0 CO M 7 7 co W �coj 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 W W 0 COCll CO 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 O O CV (4 Cr 7 452.00 452.00 452.00 I 452.00 t 0 (6 ; C N 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 N C 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft Z6 LL CI N -CV O h n O O h n O O 107 123 M M N N M CO N N CO CO N N CO CO N N CO CO N N CO CO N M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 25,046 25,048 25,048 25,048 25,048 25,051 25,051 25,051 25,051 25,051 25,051 25,053 25,053 25,053 25,053 25,053 M (0 O O 0 0 N 0 N N 25,053 _ 25,053 25,053 _ 25,053 25,053 f 25,055 C .7,'E a > LO > 0 r ONi W r-0 ONi000000 0 r-0 0 r-0 0 co M co M M co M 00 M 00 M co 0 M 1) E r C U0) > Z6 LL 0) r 0) O I,- I,- O O I,- I,- O O 107 123 CO CO N N CO CO N N CO CO N N CO CO N N CO CO N N CO CO N M Flood Hydrograph Flow cfs 0.26 0.31 M M O O 0.31 0.36 CO 0 CO M O O CO 0 CO M O O CO CO V O O 7 V O O 7 V O O 7 V O O 7 V O O 7 V O O O 7 V O O U) 0 U '1p L g Q' 5 W N CO 000000000000000000000000 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 a 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 nr 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 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 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 MUDDI3o©I1= Ctrl DRAINAGE AREA -ACRES 10.19 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) 0.31 LOW LOSS RATE - PERCENT 85.00% O E C (0 (1) U W N a a m 0 O O O CD O (001— O CD O CD I� 1` O CD 1` 1` O CD 1`O O CD a0 c0 O CD a0 c0 O CJ O c0 (3 CJ O c0 (3 CJ O (000) (3 CJ (3 CJ Time Minutes Hours 0 N- O O 0.25 0.33 0.42 0.50 1(00 ((00 O O 0.75 0.83 0N) 0 O 0 N M 1.42 1.50 1.58 1.67 1.75 1.83 MEM 2.00 0 0 0 0 N 0 0 N M 0 0 co 7 0 0 7 0 0 0 0 0 0 0 0 1- 0 0 r O 0 0 CO 0) 0 0 0) cD 0 CD CD 0 CD Unit Time Period I N CO V O O r-- CO O O,_ N,- 7 15 16 CO 0) O N 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 C W 0 W m 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 O O (V (4 Cr 7 452.02 452.03 452.05 452.06 452.08 452.10 _ 452.12 I 452.15 w U 0 C C N 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C) 0 0 0 0 0 C) 0 0 0 0 0 C) 0 0 0,- 0 C) 0 0 N 0 C) 0 0 CO 7 0 C) 0 0 (0 CO 0 C) 0 0 OD 0) 0 C) 0 0 O W m S U O 0000000000000000) W N OMON, N lb 1- 7 N((0,((O .-N- M N (V N NOai C) C) Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft CO CO CV CO CO CO CO 0, CO CO CO 0, CO CO CO CO N N 0 0 N N 0 0 62 165 165 165 174 174 175 175 N (O N- N- CO N- N- N- 178 174 174 174 174 174 174 174 174 174 174 174 174 174 174 174 174 174 174 175 175 175 176 (0 r C` N- 178 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C O <D 0 O 2 u n U 4 4., N 0- CO N O N 0 0 (0 N cV N (O (O (0 (O 0 0 N (n N N (O (O (0 (O 0 0 N (n N N (O N (0 10 0 0 N (O N N 777770) 7 7 0 0 O O N N 7 7 0 0 N (O N N 7 N 0 0 N (O N N 0) 0) O (O 0 0 N (n N N 7N N- 0 0 N O N N (0 0) .cr10 c0 N O N N r- LO 70 N CO N O N N N -O N- (O co 7 N O N N C`O CO 7 (O ( O N v,- N N Basin Volume cu -ft 0,03000000000000 T- O O O 62 62 62 62 (0 N(O O N 10 0(0 N.,- 0(0 N 7 758 1,054 1,452 1,850 2,349 2,848 3,449 4,151 O) E w O C U (o co N CO (010 CO CO OD N CO CO OD N CO CO N N co 0 N N 0 0 N 10 0 CO 0) 10 CO CO r 0) (O (O NM 0- 0- 77 CO CO r 0- (0O 0) 10 r 1- (O(O 0- 0) r 0- rO Flood Hydrograph Flow cfs 7 CO O O 0.46 0.46 0.46 0.46 0.46 0.46 0.21 0.21 N N O O 0.21 0.55 0.55 0.55 0.89 1.23 1.57 1.57 O O) 2.25 2.25 MIEM 2.93 0 c r QC W 77777777 0 0 0 0 0 0 0 0 NN 0 0 NN 0 0 82 0 0 088N 0 0 0 0 0010 0 0 0 0 NN 0 0 NO 0 0 Loss Rate in/hr Max I Low 0.23 0.25 0) 0) NN . O O6 0) 0) N N O6 0) 0) N N O6 CO OD N N O6 CO OD N N O6 CO N COCOCOCOCO7 O6 O6 0.34 _ 0.37 0) 0) O6 N N 7 O6 0.45 _ 0.45 W 7 10 . 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 0 0 Storm Rain in/hr 0.26 0.30 O O M M 0 0 O O M M 0 0 O 00000 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 GOO DDD o@E Ctrl NIGICML \E DRAINAGE AREA -ACRES 10.19 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) 0.31 LOW LOSS RATE - PERCENT 85.00% T C C (0 d V W 5O) o_ a a m a co O) 0 0 OD) 0 0 OD) 0 0 OD) 0 0 00000 T- T- T- T- T- T- -. T- T- NM T- T- 7710 T- T- 0 T- T- (O(O T- T- 1� T- Time Minutes Hours 2.08 2.17 N M N N 2.42 2.50 2.58 2.67 0- W N N 2.92 3.00 3.08 3.17 N CO M M 3.42 3.50 3.58 3.67 0- CO M M 3.92 4.00 4.08 4.17 (0 O N CO X 0) O M1010 0) O (0106 , 0) O , 0) O (O1-r00O0) T- 0) O , 0) O , 0) O 0)OO N 0) O N N 0) O N N N 0) O 10(0 N N 0) O M774] N N 0) O N N Unit Time Period 0 CO N N 1- CO N N 29 30 31 32 M 7 CO CO 35 36 0- CO CO CO 39 40 41 42 CO 7 7 7 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 C LU ,- /! 10 N CO 7 N N N N 7 7 N M N N 7 7 M N 7 452.47 452.52 452.58 452.65 452.74 452.85 452.96 453.09 453.23 453.26 453.26 453.25 453.25 N N CO C) 0 7 5,- O T - co O C To N co_ N T -N0 O O O O O O CO (D N O O 0 N 00 O O 0 0 0 CO 77 O O O CO O (O CO O O CO CO CO 0- O O 0 0 CO CO 0 O 0 0 CO c0 0 0 0 CO N. 1` 0 0 Tot Ba cu -ft 4,775 71—N(000 co OO (O 0 0 1-0 r 00 0 coto 6 NN 0 010 15,521 17,536 20,059 to 000 0 0 N N 29,651 34,202 34,975 _ 34,904 34,788 _ 34,656 34,494 _ 34,316 000 N. W 000 N. W 100 N. W coo0Doi N% 007) N% 0000000000 N 0 0 0 0 0 0 0 0 0 Basin Losses Maximum Percolation cu -ft 179 O0 O GO T- T- CO (0 O T- T- 7 N (0 OO T- T- r O (O OO T- T- O N 7 0 0 0 T- T- T- 1- 0 0 0 T- N ,1-00000000000 0 0 N N 0 0 N N 0 0 N N 0 0 N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 25,757 25,888 26,035 26,181 0 00 CO O CO 0 N 0 26,709 26,899 ON .- M h N- N N 27,618 27,986 00 mt 0(0 CO W O O N 0 29,345 29,947 30,050 _ 30,040 30,025 _ 30,007 29,986 29,962 Basin Volume cu -ft 4.954 00 O n 8,975 10,182 CD CID 7n .- .- CO mm N1. 0 10 17,728 20,253 NO ON N N 29,855 34,410 35,184 35,113 34,996 34,864 34,702 34,524 N _ O C O 15 U 0 M 0000 0 0 0 O.- T- N. 0 0 N CO N. NN 0 0 mr N. 701�1- 0 0 N co T-. 0 N 1` N N 00001 N M O co CO CO 7 NO co 1. CO mc O M 0 N O I� O 7 M Flood Hydrograph Flow cfs 3.27 3.61 3.95 3.95 4.29 4.63 1` r 0) 0) vv 5.31 5.65 CO CO CO 0 1r6 10.08 11.10 12.80 15.86 3.27 0.46 0.31 0.26 0 0 00 m Q C sE N �) re C 0 W M0M 0 0 0 00 0 0 07 0 0 (00 0 0 N00 0 0 O0 0 .,- N7 T .‘" 000N 0 0 0 0 00 0 0 Rate hr Low 0.53 0.56 0.59 0.59 CO CO O (O 0 0 0 0 0 O 0 0 0 CO 1� r 0 0—.-- 0.87 1.01 O O CO O Cl 10 CO 0 0 0 O O 0.17 _ 0.14 OD (O O O O O M 0 MM M . . 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 Storm Rain in/hr 0.63 0 0 0 0 0 0 0.73 0.76 0.79 0.79 0.83 0.86 O- '—,—'—,— CO M 1.56 1.85 CO0M O O 0.20 0.17 '. O O O RCFC & WCD GOO oDD o@E Ctrl DRAINAGE AREA -ACRES 10.19 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) 0.31 LOW LOSS RATE - PERCENT 85.00% Pattern Percent (Plate E-5.9) 1.9 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 co N O O 0) N 7 co N 0 M 7 (O 7 7 7 O I. O O a a (0 CO 1� 0 a a N 0 0 0 a 10 CO N. 0N- 1n (() 10 CO N CO 1n (() N 0 M. (O 1f) ((P CO 1. O O 1f) 10 10 CO 1� CO 1f) 10 N O 0 0 (0 0 Tir Minutes 255 o O 0 CO CO N. N N N O 0 1` O N N O 0 CO 0 N N O 0 CO 0 N CO O 0 0 CO CO O 0 N CO CO O 0 N CO COM O 0 CO 7 CO CO O 0 7 (0 CO CO O 0 (0 (O CO CO Unit Time Period 51 52 53 54 55 56 57 58 0 0 0 0 63 64 0 0 67 _ 68 0 0 0- N- EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 = 10 1 C C 0 V C 0 0 0 0� U V O N @ f' @ (0 N c0,— 0 O� csi ,i. 0,0 MM O 0 0 O O N N r 4 O 0 7 .2 N lil1- z 0 W W N F w Q Q woo Q Z w w 0 0 1- 0 ix0 WOW ZZ(00) z W 4 J 0) j O O w w w O< w J<OH NW 03 JC9 Z O 3 7 0—QLL0000>¢1-w I-Kow(Ji(JiaK2 WaE-Q 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 J rh W CO 452.00 452.00 452.00 _ 452.00 - 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 452.00 Total In Basin cu -ft 1 ac -ft 0 0 O O 0 0 O O 0.00 0.00 0.00 0.00 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 0.00 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 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 0 0 9t 0 O O O Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 49 73 73 98 73 73 73 98 98 98 N N N N 122 147 147 171 f� 00) 147 171 00) 00) 220 220 245 245 245 269 294 318 367 367 392 416 465 122 330 523 CON(OO V N N N N 0 (0 N N N N (n (0 N N N N (n 0 N N N N (n (0 N N N N 0 0 N N N N (n 0 N N N N (n 0 N N N N (n 0 N N N N (n 0 N N N N (n 0 N N N N (n 0 N N N N (n 0 N N N N (n 0 N N N N (n 0 522 _ 522 522 523 523 523 523 523 523 522 523 523 CO M M N N N 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 0.00288 Low Loss Rate (percent) 85.00% C N N Q N N IL 25,042 25,046 25,046 25,049 25,046 25,046 25,046 25,049 25,049 25,049 25,053 25,053 25,053 25,053 25,053 25,056 25,056 25,060 25,060 25,064 25,056 25,060 25,064 25,064 25,067 25,067 25,071 25,071 25,071 25,074 25,078 25,081 25,088 25,088 25,092 25,096 25,103 25,053 M M co U N N 25,091 25,088 25,085 Basin Volume cu -ft 49 73 M 00 I- 0) 73 73 73 98 co 00 0) d1 N N CV CV N N CV CV 122 147 147 171 171 196 147 171 CO (O 0) 0) 220 220 245 245 245 269 294 318 367 367 392 416 465 122 330 538 N I- N CO (O 7 co co co Volume In cu -ft 49 73 73 98 M co I. 73 98 0000 0) 0,CNICNICSICNI N N N N 122 147 147 171 CO r- 0) 147 171 (O CO o 0) 220 220 245 245 _ 245 269 294 318 367 367 392 416 465 122 330 538 r n N 0 0 7 M CO M Flood Hydrograph Flow cfs 0 00 O O 0 0 CO O 0 0 0.08 0.08 CO T- O r O O L L'0 _ _ 0.14 0.14 _ 0.14 0.14 0.14 0.16 CO 010 0 0 NOD N- NT- 0 0 01 T- 0 0 0.22 0.22 0.24 0.24 0.27 0.27 I- O N M 0 O 0.33 0.35 0.41 0.41 0.44 0.46 0.52 0.14 NCDT- M CO O O T- OD 7.1. 01 O O O Effective Rain in/hr O O O O 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 N N O O O O N N O O O O N N O O O O N N O O O O M M O O O O M M O O O O M M O O O O 0.04 0.04 0.04 0.04 0 c- 0 0 0 0 7 CO 0 0 0 0 7 7 7 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low O 0 M 7 O O O O 0.045 0.060 0.045 0.045 0.045 0.060 O 0 (D (O O O O O _ 0.075 0.075 0.075 0.075 0.075 0.090 0 0 0) OO_ O 0 0 0 0 Nd) 0 0 0 0 O O 0 0 0.120 0.120 0.135 0.135 0 0 000 0 0 0 0 (O 0 0 0 0 CO 0) 0 0 0.225 0.225 0.240 0.255 0 0 CO CD N CO 0 0 0 0 MN M CO 0 0 0 0 0 NO N N M 0 0 0 0.549 0.543 _ 0.536 0.530 0.524 0.518 0.511 0.505 0.499 0.493 0.487 0.481 0.475 0.469 0.463 0.457 0.452 0.446 0.440 0.435 0.429 0.423 0.418 0.412 0.407 0.401 00) 0) M M O O _ 0.385 0.380 0.375 0.370 0.365 0.359 0.354 0.349 0.345 0.340 0.335 0.330 N N 0 M M M O O O Storm Rain in/hr 0.035 0.053 0.053 _ 0.071 0.053 0.053 0.053 0.071 0.071 0.071 0.088 0.088 0.088 0.088 co (D O O O O 0.106 0.123 0.123 0.141 0.106 0.123 0.141 0.141 (3) (3)(O 0 0 0 0 (O(O7 I's n 0 0 n 0) 0 0 0.212 0.229 0.265 0.265 0.282 0.300 0.335 0.353 0.370 0.388 O0M ClUD N M O O O RCFC & WCD FAzamaL DRAINAGE AREA -ACRES 10.19 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 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 CO N- O O 0.7 0.8 CO n O O 0.8 0.8 (3) 0) 0 0 O O T- T- O 7 T- T- 1.2 1.3 1.5 1.5 (O h T- T- 1.9 2.0 Y- N N N 0 0 0 T- T- N O 2 0.25 0.50 00 h 0 O,_ 1.25 1.50 1.75 2.00 2.25 2.50 0000 I. O N M N 0 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 00 h 0 N 0 8.25 8.50 00 h 0 OO D) 9.25 9.50 NON h 0) O CD ( n O O O Time Minutes LO M 45 60 n 001 0 0 O 135 150 165 180 0 0 Q)M 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 0 0 0 7 (O (O (D Unit Time Period N M 7 0 (O I_ 0 a OT- Cq CO Tr U, 0 17 18 19 20 N N N CO 7 N N 25 26 27 28 29 _ 30 N 01 CO 33 34 0 (O 01 CO 37 38 39 40 N M 7 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 V)w N(O m 5 v 452.00 452.00 452.00 I 452.00 452.00 452.03 452.07 452.13 452.19 452.28 452.37 00 N N V V 452.48 I 452.53 452.59 452.63 452.67 452.71 452.72 452.74 452.72 452.70 452.68 452.66 452.65 452.63 452.61 452.60 452.58 452.56 (LO VN) NN Lo uo V V 452.51 452.49 452.47 452.45 vv NN LO LO V -71- 452.40 452.38 452.36 I 452.34 Total In Basin cu -ft ac -ft o O O 0 O O O O 0 0 0.00 0.00 N (O 0 0 0 0 CO N 0.-,- 0 0 I. C) N 0 0 0.25 0.27 0 COCO 01010101 O 0 0) O 0 0.42 0.44 0.45 0.46 0.45 0.43 0.42 0.41 0 0) 7 OD 0 0 0.38 0.37 CO IA CO CO O O 0.34 0.32 0 CO CO O O 0.29 0.28 0.27 0.26 0.25 0.23 0.22 0.21 00 000 882 1,963 3,407 5,047 7,534 10,051 10,809 11,602 13,080 14,426 15,804 17,050 18,164 19,146 19,507 19,901 CO CO c- CO 7O) O) 00 18,428 17,923 17,469 17,017 CO CO 0) (OO (O (O O N �7 (OT- 6 u) 14,653 14,136 Cr 0) ,T N. (OT- 00 M 12,690 12,179 't O 0)T- CON T- CO N NN N. CV O O 9,743 9,241 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft (n CO M 264 306 (n N N N 526 529 534 539 546 554 556 558 563 567 571 575 578 581 583 584 N 0000 (CO (O 579 578 576 575 574 572 O) I0 (O ((O 4O 568 566 565 563 562 560 559 557 556 554 553 551 (O N (O N N N N uO LO N N N N UO LO 526 529 534 539 546 554 556 558 563 567 (O I0 n UO (O 578 581 583 584 N CO CO UO (O 579 578 576 575 574 572 571 569 568 566 565 563 562 560 559 557 556 554 MEM 551 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 0.00288 Low Loss Rate (percent) 85.00% Percolation Area sf CA O 10 N 25,073 25,080 25,038 25,068 25,240 25,398 25,609 25,849 26,212 26,580 26,691 26,807 27,023 27,219 27,421 27,603 27,765 27,909 27,962 28,019 27,948 27,878 27,804 27,730 27,664 27,598 27,532 27,463 27,394 27,325 27,252 27,177 27,105 27,037 26,966 26,891 26,820 26,749 26,679 26,605 26,535 26,462 C N .N E CO _7 CO 0 .-- w j U Ln ) ?,'2, Ch 264 306 () N N N 1,408 2,493 3,940 5,585 8,080 I 10,605 (O M CCD CV 13,643 14,993 16,375 17,625 18,742 19,727 20,090 20,484 19,999 19,514 19,007 18,501 18,046 17,592 0) OD C0(D (-( 0) (O OD- ai(0 15,221 14,702 14,209 13,742 13,252 12,739 CO CO (a) 1. 0 c- 11,283 10,777 10,296 9,792 Volume In cu -ft N 00 264 306 21 225 CO , p Tr(OO I's O) r 3,033 3,071 (n MM 2,041 1,913 1,949 1,821 1,692 1,563 944 977 CO0)0) 73 73 N NN 122 98 CO CU Ch 73 49 73 98 73 49 CO CO 73 49 N.7 Flood Hydrograph Flow cfs O a oO 0.29 0.34 N() O N O COO) (O t` c- ON N V N N 3.37 3.41 1.46 1.50 2.27 2.13 I. CV c- 0 N N 1.88 1.74 1.05 1.09 __ O O 0.08 0.08 0.14 0.14 7T- 0 0 T - T -W T 0 0 10 0 0 0 0 0.08 0.11 W I!) O O 0 O 0.08 0.08 0.08 0.05 0.08 0.05 Effective Rain in/hr T o.04 0.03 0.03 O N O O CJ C7 0.15 0.17 0.21 0.24 M OD M C CJ C7 0.14 0.15 0.22 0.21 0.21 0.20 0.18 0.17 O_ T- CJ C7 0 0 CJ C7 0 0 CJ C7 0 0 CJ C7 0 0 CJ C7 0 0 CJ C7 0 0 0 C7 0 0 0 C7 0 0 0 C7 0 0 CJ C7 0 0 CJ C7 0 0 CJ C7 Loss Rate in/hr Max I 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 (O O O CA TT CO O O 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 0.060 O O (O (O O O O O 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 0.030 0.045 0.030 0.311 0.307 0.302 0.298 0.293 0.289 0.284 0.280 0.276 0.272 0.268 0.264 0.260 0.256 0.252 c0 7 V 7 N N O O 0.240 0.237 0.233 0.230 0.226 0.223 0.219 0.216 0.213 0.209 0.206 0.203 O Ns O CA N O O 0.194 0.192 0.189 0.186 0.184 0.181 O) � Is Ns 0 0 N Cs Ns 0 0 O CO Cs (O 0 0 Storm Rain in/hr CO (O CO O 0.335 0.335 0.300 0.318 0.441 0.459 0.494 0.512 O O O O CO (O O O 0.406 0.406 0.476 J 0.459 0.459 0.441 0.423 0.406 0.335 0.335 0.071 0.071 0.053 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 0.071 0.053 0.035 0.053 0.053 0.053 0.035 0.053 0.035 RCFC & WCD FAzamaL DRAINAGE AREA -ACRES 10.19 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) O N W CA r r N CO r r CO 0 N N 2.8 2.9 V V co CO M 00 N N Is (0 N N 2.6 2.5 V OO N N O) O) c- T- 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 X O O ,- LO O N (O ,- 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 (O O N (O T- T- T- 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 C) O CO CO 675 690 705 720 735 750 765 780 795 810 825 840 855 870 885 900 (O O OD O O 945 960 (O O O) 0) O (A 1005 1020 1035 1050 LO O CO CO O O 1095 1110 1125 1140 1155 1170 1185 1200 1215 1230 1245 1260 MiEaM 1290 Unit Time Period a a (O CO 7 V 47 48 49 50 51 52 C°) V 0 (O 55 56 h co 0 (O cu CD 0 00 c- CV CO 0 63 64 LO CO CO 0 I. CO (O CO O) O 0 N- c- CV n (� 73 74 75 76 (- CO h O) Oc- CO N 00 CO 83 84 I 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 J W N 0) V C° J N 7 452.31 452.29 1 452.27 452.25 452.23 I 452.22 452.20 452.18 452.16 Total In Basin cu -ft ac -ft 0.20 I 0) CO O O h CO O O 0.14 0.13 N_ ,— O O O O 7 8,265 7,791 7,295 6,800 6,307 5,815 V L[) co (O I- m NM V co co co ui7 7 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 550 548 547 545 544 N V 7 O) CO co co co co I) LO LO U) UV 550 548 547 545 544 542 541 0) CO CO CO CO CO LO (L) (L) 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 0.00288 Low Loss Rate (percent) 85.00% Percolation Area sf N 26,319 26,250 26,177 26,105 26,033 25,961 25,889 25,818 25,747 O O N 0 E _ y 2 m ; 0 0 C 0) O 8,813 8,338 7,840 7,344 6,849 6,356 V CO NI - m n co c0 co c0 LO (O Volume In cu -ft M 49 73 49 49 49 49 0) 0) 0) 0) 444 Flood Hydrograph Flow cfs 0.08 0.05 0.08 0.05 0.05 0.05 0.05 LO LO LO O O O O O O Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 6666666666 Loss Rate in/hr Max Low r 0.045 0.030 0.045 0.030 0.030 0.030 0.030 O o O co co co O O O O O O (0 0.165 0.163 VD CD U1 CO N. UV UV O 0 0 0 0 0 0 0 Storm Rain in/hr 0.053 M LO 0.035 0.035 0.035 0.035 M M M O O 0 0 0 O O 0 0 0 RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z DRAINAGE AREA -ACRES 10.19 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 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 (unh-o O (h c64 2 N N N Time Minutes 1305 1320 1335 1350 1365 CD UV c0 0) O UV CD N V 0) CO V V V Unit Time Period 87 88 89 O N CO 7 U) CO 0) 01 0) 01 0) 01 01 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 5 C 0 0 C U V U 0� V 0 ON N _ 0 ? (lO N m m N M 0) co N O O d 4 M M N Z 0 ww w~ W 00 c J. Z W w 0o o0 W H Q CC LOO LLOWm7mcow Z W <01— CeCe —ILL▪ Z▪ _W_V °X� O<OLL�_IOwwQ W O> i—W cow LLLL2LL2mi—< BASIN VOLUME WORKSHEET PROECT CORAL MOUNTAIN JOB No. 2553 BASIN DESIGNATION: BASIN C BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR (ft) TOTAL (ft) AREA INCR (sf) TOTAL (sf) INCR (cuft) VOLUME TOTAL (cuft) (acre -ft) 452 0 0 25,035 0 0 0.00 453 1 1 3,930 28,965 26,976 26,976 0.62 454 1 2 4,095 33,060 30,990 57,966 1.33 WHERE: V= l(E�—E2)(At+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 March 30, 2020 DLS 1 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 HM201 217 IVtEL1°. GSM °�. 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 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 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: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE CO OD 0 0 0 0 0 0 0.0304 0.1344 rn CO 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 0 J O 3 O J J 11 J C H ° o E 2 m O J, m '0 ''y+' N C d >-'R a N O a' C O Y > y G CO IL OO 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 co O AREA WEIGHTED AVERAGE N OO 0000 O) O) - N 0.389 (n Q W K Q 2.588 2.323 4.803 7.637 11.052 co 0 7 N SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC 11 ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.05 8Z.0 01'0 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 0 0 O O 0 0 NLO 0 O— PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 0.51 0.51 RI NUMBER [Plate E-6.1] CO CO 0) 0) CO CO 0) X/ CO L LAND USE PAVING/HARDSCAPE WATER FEATURE COMMERCIAL SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL=. [I ULM SOIL GROUP [Plate C-1] 0)0)0)0)0) 70) N W 0 G) M N a m a PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm r-,01' W NN m> _ 451.03 451.06 0 0 451.19 451.25 451.31 451.40 N N O � • N 0 10 452.08 452.10 o 10 C C 1,-.0 0 0 0 0 0.25 0.35 0.47 0.60 0.76 0.98 1.38 2.50 2.67 2.74 02 U N h N O 10,865 15,278 Lom W N - ON N 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 00.000.000.0 000000000000 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 101,500 101,904 102,340 102,807 1,-N MO MM M M 00 104,712 105,729 107,532 113,212 116,019 117,221 Basin Volume cu -ft Wnw N W N Od 6- 20,285 26,183 33,269 42,879 59,912 108,718 116,249 119,475 o C o 0 Z 0 2,929 3,820 W M_ .- a 7 a 5,007 5,898 W O O W r W 17,033 48,806 7,531 3,226 Flood Hydrograph Flow cfs M r 0 W H N ri 0 r 4 M W 0 W cd oi N M c0 O N W T 1� f0 N fg 25.10 10.75 U) C U 'cp t (DC C W 0.34 0.44 0.48 0.51 W O 00W, 0W(D 0 0 N N - 0 1.98 5.68 0.88 0.38 Loss Rate in/hr Max 1 Low 0.53 0.62 W0000r 00000- W O M 1O0 1.92 5.07 M OO 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 N M 01,1-0- 0 0 W W 0 0 0 1� W 0)-aN 0 0-- ,- 0 0 0 0)-0 0- 0 0 O RCFC & WCD G 7DGi0O1. Wf NIG1Gfl. IMIL 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) 3.6 4.2 4.4 4.6 o W 1010 6.4 8.1 13.1 34.5 n W 0M Time Minutes Hours 00-000 0. -NM 6666 0.42 0.50 00-000(00 M W, 00000 W M 0 u,oO m N 25 30 35 40 45 50 55 _ 60 Unit Time Period 10 M V 1[) W 0- 0 0 0'- N C 55 C 0 5 0 5 0 0l) C U U >m. V-. a O N 0N- 0 0 E W '- m rn'-Nn IL-)FA'q" Q ',IC, N 0 V a o O m • 7 N O O O 7 CO W M 7 J O W G Q O ce O z J 0 LL W W W ~ Z W U' U` W co J a i m z W W O '- O O Ili ▪ Z o W m>?�y mza 1= _I m— owwwO<L W Q • W O W 0 0 7 7 Y Q LL r z J u O O 3 0 X' 0- W ii.W 1- 0) O W LL LL 0 Q 0 I Q 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 0 >m m 451.00 451.01 O O V V 451.03 451.04 O O V V 451.08 451.09 451.10 451.11 451.13 451.16 451.18 451.20 451.23 451.26 451.29 451.32 451.37 451.41 451.45 451.49 451.53 (0 O (0 ; C N N O O O O 0.02 0.04 CO 0 0 O O 0.12 0.15 CO N O O 0.24 0.27 COCO CO CO O O 0.44 0.49 0.56 0.64 m I7 r 0 0 O O 0) O 0 ... 0) m 0) O N . Om @ C j 452 904 915 1,809 2,702 4,258 5,151 6,706 8,262 9,155 ((00N N0 COCDrT N(. 19,138 21,135 24,456 27,997 0 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 Basin Volume cu -ft 452 904 915 1,809 CD N N V 5,151 6,706 8,262 9,155 N C ,— ,- 14,263 16,701 19,138 21,135 _ 24,456 27,997 _ 30,876 34,417 _ 39,282 43,706 _ 47,688 51,891 56,315 U 452 452 (0 T— (0 T— 1,555 893 a 0 T— CO CO N N 2,438 1,997 M CO 2,879 3,541 4,865 4,424 3,982 4,203 4,424 Flood Hydrograph Flow cfs (0 10 O 00) ( O N 2.98 5.18 2.98 5.18 5.18 2.98 3.71 5.18 8.13 8.13 co 00 co (O O O 0 ' ' O co O) ' N 0 Nr.- 6 4 13.27 14.01 14.75 Effective Rain in/hr 0.05 0.05 00 0 O O 0.10 0.18 0.10 0.18 CO O O 0.13 0.18 0.28 0.28 0.28 0.23 0.39 0.41 CO a O O 0.57 0.51 0.46 0.49 0.51 Loss Rate in/hr Max 1 Low 0 co N N O O 7 CO N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 (00) CO CO O O 00 Cr V O O 0.48 0.44 0- 0) (0 10 0 0 N0) (0 10 0 0 N0 I- (O 0 0 CO 10 OD 0 (0 CO 0 0 0 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 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 M CO O O 0.28 0.39 0.39 0.46 0.39 0.46 CO CO (n0 O O 0.41 0.46 0.56 0.56 0.56 0.51 (00 O O (NO (00 O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD MUDDI3o©I1= Ctrl FACACME 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) M M ,— .,. T- (0 ,. .,. (0 CO ,. .,. (0 0 ,. ,.- 1.8 1.5 (O W. T- T- T- N N N N 2.2 2.0 CO N- N CJ V r N CJ — CO T— M CM 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 CO 7 N CO 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 65 70 75 80 O(0 0LO 0) O 00)CD _ 105 110 (0 0 ( 0 T- T- T- Unit Time Period N M (0 (O r CO 0) O I. N, 7 15 16 N- CO 19 20 21 22 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 J 7) W @ S °3 451.59 451.67 r •0 .0 451.97 452.10 452.18 452.20 452.21 452.23 452.23 w U C co N N N V 1.77 2.06 2.37 2.73 2.98 3.02 3.06 3.09 3.10 @ O m S U CO N CO CO N'.. CO- N- CO r0 - 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 C, 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 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 7107,877 108,789 109,350 110,683 112,132 117,060 121,010 121,754 122,333 122,913 122,987 Basin Volume cu -ft CO 0 CO CO r M .- CO O r 77,088 89,675 103,366 119,042 129,644 131,641 133,196 134,752 134,950 - > 0 co0 W to cD W co MUl In N 13,691 15,676 10,602 1,997 LO — — Flood Hydrograph Flow cfs rNco N N M N- V 45.64 52.25 M M M o 5.18 5.18 0.66 Effective Rain in/hr O 0 CO O O .- 0.62 1.47 1.59 1.82 1.23 0.23 0.18 0.18 0.02 Loss Rate in/hr Max I Low N o O o- nv° O T- uF- T- T- 1.29 0.44 o- cc 0 0 0 O co N N o O 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 Storm Rain in/hr co co O N c- L- o (0 Cr) n O N- n N- CO N- N- N 1.52 0.51 0.46 0.46 0.15 RCFC & WCD GOO oDD o@E Ctrl FACACME 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) N O V N 3.5 6.8 MN N - CO 5.9 2.0 CO CO (0 ' T- C3 Time Minutes Hours N N N M V m N N 2.50 2.58 2.67 2.75 M 0 N N M O N M CO 140 _ 145 150 _ 155 160 165 170 175 180 Unit Time Period 26 27 28 29 30 31 N M M M 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 C U V C U U U U M 0 1°7 : o 0M o M 0 N U O N N Lo M A M A(0 IO 0 W WW Nr oLU LL1 1-0 Z2 2 O O Q OJ a' OCOWDDtoic7 Z W CO11 j PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm y�j O CO CO 451.00 451.00 000000 7 7 7 7 7 7 451.02 451.03 451.03 451.03 0000 7 7 Ti; 7 451.05 451.05 451.05 451.06 451.06 451.06 451.07 I 451.07 0 U (0 ; C N O 0 0 O O N N 0 0 O 0 CO 7 0 0 0 0 a M 0 0 0 0 0 LO 0 0 0 0 h O 0 0 0 0 Cr, 0) 0 0 0 0 OT- 0 0 N_ CA M_ 0 0 (0 0 0 (0 (0 0 0 co N- 0 0 Om @ V MO0N N V r 00) 01� M M 01(0 (07 M M 00 �(V MN M M 7 1— N(V N M I O M MM V �01� C 0 cO O M'dr OO) 0) M M 1` 77 I D N O 7 N Lri N7 0 O r&(0 N(O (0 I� O 0- t0 (O 0M N I A N t` t` 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 0 CO N. 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 C(0 E O O 0 [D > M O N V (O N r N O 1— M M N 10 (0 V M M 0 N M N M M 7 1— N N N M 1 O M M M 710 10 h O M V h 0 0) M M 0- 7 V O) I- N O V 10 L0 N 7 (0 O r ca 10 O (0 0- IL')O 1` 0 O O M N I— N I� r m E 5 .. — O U J 213 256 256 256 256 299 299 299 299 299 299 341 341 341 341 341 341 341 341 341 341 341 145 Flood Hydrograph Flow cfs 0.71 0.85 0.85 0.85 1(0 0 0 Q.PQ.PQ.P77 0 0 0 0 0 V 7 V 777777777 1.14 0.48 O 0 o•(p L W Q' 5 W N co 000000000000000000000000 0 0 co co 0 0 co co 0 0 M M 0 0 M M 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 0 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(0 N N O O M(0 N N O O M(0 N N O O M(0 N N O O M(0 N N O O M(0 N N O O M 10 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 0 Storm Rain in/hr T -N O O 0.20 0.20 0.20 0.23 NNNN O O 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 MUDDI3o©I1= Ctrl 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 5 4 1)) U W 0 a a m 0 (000001 000000000000000 1. t` 0- t` 0-(00000000000000000) CJ OCD OCD OCD OCD Time Minutes Hours 0.- O O 0.25 0.33 0.42 0.50 100 (n0 O O 0.75 0.83 0N) 0 O 0 7 N M 1.42 1.50 1.58 1.67 1.75 1.83 MEM 2.00 0 0 10 O N 10 O N (0 (0 O (0 a (0 O a (0 (0 O 10 (0 10 O CO 0- 10 O r O 10 O O O) 10 N 0) cp 0 0(0 0 0 Unit Time Period I N co V 10 0 I- CO 0 O,_ N,_ 7 15 16 r- CO 03 O N N N N CO V N N PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm W = (1) w M 451.07 451.07 451.07 451.08 CO CO O O 0 7 CO CO O O 7 7 451.08 451.09 451.09 451.10 O.- V 7 .- N 0 7 M7 V 7 451.16 451.17 451.19 451.21 451.23 451.25 _ 451.27 I 451.29 w ( N C C 75 N r N 0 0 O W 0 0 0) O) 0 0 0) O l N 0 0 T- N N N 0 0 CO 7 N N 0 0 M (0 N N 0 0 COO N CO 0 0 N 10 CO CO 0 0 W N CO V 0 0 CO T- V 10 0 0 CO O N (O 0 0 CO N CO r 0 0 O N m S O «) O 001OOM (0 n r n N O 00 R. W V O CO Of) W V 0) W NN V (0070 OO W O W W Oi Oi O 0 Oi O r N. 1-00 ? O`- N O NOON N (V 1' N. OOM M In co co 1�M (O (0 C° N. OO V O O N N N 0- ' ,�M M 7 N N O N t• W N M Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O O 0 O 0 O 0 O 0 O 0 O 0 O 0 0 O 0 O 0 O 0 O 0 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 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C 0 '@ N 0 Q` 0 `0 0- CO .- O 0 0 E, N 0 0 T- T- h N N V 0 0 N N 0 0 h CO N r 0 0 N N 0 0 CO CO OO O 0 N N 0 0 CO 7 O N N 0 0 0 O,- 7 W N N N N 0 0 CO M O CO 7 N N 0 0 N (0 OO O 7 O N N 0 0 CO 0) CO O CO . N N 0 0 N.- CO M O.- N 0) 0 0 1` M N N CO O M 0) 0 0 OO 7 I� I,- 0) 0) 0) 0 0 N (0 co N( O V V 0 0 Basin Volume cu -k 0 O mrs N: 0 7,905 8,050 8,194 8,339 8,484 8,629 O 0. omr (A (P CO V M (A e 10,777 11,491 0 0) N0) c..1 c4 .-.-.-.- 0 ON o5 Lrii COO M t-- CO o5 (O .- 20,188 22,041 24,178 26,315 28,736 31,442 m E w O C j U N M V)LO ,r LO LO ,r LO LO ,r OOOOO,r 77777 I -r r OM ON T - -N. CO CO N O NN co.,O N. (0 t` .7 NN co NN Flood Hydrograph Flow cfs 7 CO 7 0 CO CO 7 7 0 0 0.48 0.48 0000 7 7 O O MM 7 7 MM 7 7 , Mm 7 CO N N CO CO CO M N< V MN CO N M 7 MM N N (O 10 0-0- (O O 7.12 7.12 rN O O mi, 6 N '(C s mQC0 W 7 2,1 0 N 0 0 N 0 0 N 0 0 N O 0 0 N O 0 0 N O 0 0 W O 0 0 NO 0 0 W O 0 0 N N 0 0 N N 0 0 N 0M 0 Loss Rate in/hr Max 1 Low 0.23 0.25 (0 (1) N N O O (0 110 N N O O (0(1)10 N N O O W N N O O OO W N N O O a0 N Cr, O O CO CO O O 0.34 _ 0.37 CO 0) M CO O O N N 7 7 O O 0.45 _ 0.45 a0 7 11) O O 010100100100100100100100100100100100100 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 0000000)0)0)0) 0)0)0)0)0)0) 0000000000 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 GOO oDD o@E Ctrl NIGICML \E 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% T C C O d V W 5O 0- a a m a m 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O O T- T- O O T- C- O T- T- 7 T- T- N M T- T- 7 7 C- T- N O C- T- O O C- T- r C- Time Minutes Hours 2.08 2.17 N M 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 r CO (5 M 3.92 4.00 4.08 4.17 (O O N CO N (0 O M,r (0 O cr LO (0 O LO CO (0 O (O 1s (0 O r O (0 O CO 0) (0 O 0) 0 N (O O 0 N N (O O N N N (O O NCM N N (O O co,r N N (O O 7 LO N N Unit Time Period (n CO1-(0 N N N N 29 30 31 32 M7 M CO 35 36 I-(0 M CO 39 40 41 42 M7 7 7 45 46 47 48 49 50 PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm co 451.32 451.35 451.39 451.42 451.46 451.49 N I. 451.62 451.67 451.73 451.80 451.88 451.97 452.06 452.17 NNNNNNW U @ ; C co 0) r r CO 0 0 O CO 0) O 0 ,- NN S IN .- ,- Mil .- ,- 7 (O CO .- ,- CO CO N. O) .- ,- CO W a- CO N N M 7 CO 0) N N N 0 0 M M N CO 0 0 M M CO CO 0 0 M M O @ m ~ S 0 co O M O I� 0) 0) M CO 0 n (O N N co. 7 O 1s O co co co N 7 o 7 11 N N (O f� 0 (0 O 0 N O CO M (O 0-0- O 1` M 0 7 1` (n t` 00 M W N n N 7 p,_ O) f� 0 1: N N 1` N N M 01 (NO ca O N O ci Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft o o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 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 x- 0 x- CO 00- a0 W O O 109,417 110,245 111,164 112,174 115,448 120,485 0 7 0 (O CO CO N N 121,749 121,829 121,876 121,908 Basin Volume cu -k 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 0- N N I- N CO_ 0)0 OD O N)0 M M 0) O (OO O O N M M 0 E' C o j U (O 0) I2 0) c.“0 N M 0 224:g1:2:2828 0 0 (O MM 7 O) 7 N co M 77777 M M a 7 Op M W CO co 0) (O O O N 7 0 (Or N c0 00 0) 0 0 00 0) W O1 O 0 0 6v 0) O 0) 7 N� co M N N W N W Flood Hydrograph Flow cfs N 0 0 m C5 11.87 11.87 12.81 13.76 N.- N. O COO ,- 21.35 26.09 28.94 31.79 36.53 45.06 07 0 0 OOD 0-7N 0 0 0 0 0,- O) UC s QC W 4') MO 0 0 77O77 0 0 0 0 (f(n 0 0 2(O1O0; 0 0 0 0 0-W (.n ON 0 0 MN 0 0 00 0 0 Loss Rate in/hr Max 1 Low 0.53 0.56 0.59 0.59 CO 0 (0(O 666666 CO CO CD (0 O CO I,-0- 0.87 1.01 O CO CO W Cl 00N .- .- CO 0 O O 0.17 _ 0.14 OD (0 OO O O O N N N 0 0 OOCOOOCO N N 0 0 N N 0 0 OOCO N N 0 0 OOCO N N 0 0 OOCO N N 0 0 OOCO N N 0 0 OOCO N N 0 0 OOCO N N 0 0 OOCO N N 0 0 OOM N N 0 0 Storm Rain in/hr (MO COO 0 0 O N.O 0 0 0.73 0.76 0.79 0.79 0.83 0.86 O ''.- N M 1.56 1.85 COMCD CO O O 0.20 0.17 O— 0 O O RCFC & WCD GOO DDD o@E Ctrl NIG3MML \E 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) 0 0 N a -a- 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 a! CD a- 0 0.6 0.5 MN O O Time Minutes Hours (1) CO N CO V 7 N 0 7 O 7 7 CO 0- (O 0 a a (O CO I� CO a a N 0 D) O a (C CO 1` Oa- (n (C (O CO N CO (n (C N 0 7 O (n 10 CO 1. (O O 0 10 (O CO Na CO 0 10 N O O) O 0 0 (n O 000r N N O O -r--000000—'-000000000(0 N N O O N N O O N N O O N CO O O CO CO O O CO CO O O CO CO O O CO CO O O CO CO O O CO CO Unit Time Period 51 52 53 54 55 56 57 58 (0C CO(ND 63 64 (00(00 67 _ 68 CO 0-0-0- nr EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 1 D U C E (0 (O O co O3 (O 0 (O N (O 0 (00 NOOOON O• UO "‘-co M M 7 7 0 lil1- z O W W N F W Q Q gg W 0 J� ZWW00 1-1-000 w 0) D 7,o c z W OjOOWW<4-W W W 0<OH0 NW JC7 Z O 7 0—LLO_iWW,W - W 0 M O W U- 1Ji W W 0. W O Q PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm J WT 0 0, M m 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 M O O (0 (n V V 451.05 451.06 451.06 451.07 451.07 451.08 451.08 451.09 451.10 451.10 T- (O (n V V N M v) (n V V M. 1 n - v) (n V .1 - 451.16 451.17 451.18 451.19 451.20 451.23 451.24 451.25 451.26 Total In Basin cu -ft 1 ac -ft CD O 0 0 0 0 NN 0 0 0 0 M 0 0 0 0 0.03 0.04 0.05 0.05 CO h O O O O 0.08 0.08 0) On- O r O O N_ O O 0.13 0.14 (0 OO O O O) O O 0.20 0.22 0.23 0.25 0.26 0.28 O N71- 0 0 0 0 0 M 0 0 0) N M Cr 0 0 0.43 0.46 0.50 0.55 OO7 (0 CO (0 O O O I 136 341 546 818 0 0 1,432 1,705 1,978 2,251 2,592 2,933 3,274 3,615 3,956 4,365 4,774 5,252 5,729 6,275 00CD ( O h 7,707 8,253 8,866 9,480 10,162 10,844 11,526 12,277 00 CO eiT- 15,005 16,028 17,119 18,278 18,886 20,063 21,808 24,119 25,142 26,165 27,897 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 O O O O O O O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O 0 O O O O O O O O O O O 0 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) 0.14 C 0.00260 Low Loss Rate (percent) 85.00% C O @ U it Q N 0 0_ 101,204 101,226 101,248 101,277 101,298 101,320 101,342 101,370 101,399 101,428 101,464 101,500 CO co (0 (0 O O 101,609 101,652 101,695 101,746 101,796 101,854 101,898 101,948 102,006 102,064 102,129 102,194 102,266 102,338 102,410 102,490 102,576 102,670 102,778 102,887 103,002 103,125 103,189 103,314 103,499 103,743 103,852 103,960 104,143 C O '�1 E = (p O m; UT- 136 341 546 818 M O N N O N T- 1,432 1,705 1,978 2,251 N M O) CO (n W N N 3,274 3,615 3,956 I 4,365 V N f� (0 C.... N V (O 5,729 6,275 V co O (O O r 7,707 8,253 8,866 9,480 10,162 10,844 11,526 12,277 13,095 13,982 15,005 16,028 17,119 18,278 18,886 20,063 O 0) O W v - N N 25,142 26,165 27,897 Volume In cu -ft 136 205 _ 205 273 205 205 205 273 273 273 341 341 341 341 341 409 409 477 477 546 409 477 546 546 614 614 682 682 _ 682 750 818 887 1,023 1,023 O) (00 0 CO n 53.- CO ,- 1., M CO CO M O O n T- Flood Hydrograph Flow cfs in M T- N O O 0.23 0.30 0.23 0.23 CO 000 N CO O O M CO O O 0.38 0.38 0.38 0.38 CO (O(O M 7 0 0 MM V (O 0 0 N Cr) 0 0 0.45 0.53 CO O 0 0 CO 0(O CO 0 0 0 OD 1� r 0 0 CO MT- r CO 0 0 O) 0 01 0 0 V 7 T- T- ,- 1.21 1.29 On- CO M O .„_. 1.94 2.57 V 7N T- 0 ,_ Effective Rain in/hr O O 0 O O O 0 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 N N O O O O N N O O O O N N O O O O N 01(0 O O O O (0(0 O O O O M O O O O M M O O O O 0.04 0.04 0.04 0.04 0.02 0.05 1- 01 0 0 O O V 7 1� 0 0 0 O O O Loss Rate in/hr Max 1 Low O (n CO O O O O 0.045 0.060 0.045 0.045 0.045 0.060 O 0 (O (O O O O O 0.075 0.075 0.075 0.075 0.075 0.090 O (0 O) O O 0 0 CO O O_ e- N 0 0 O (n O) O 0 0 0 0.120 0.120 0.135 0.135 O O CO (0 0 0 O (n CO (O 0 0 O (n _O 0) 0 0 0.225 0.225 0.240 0.255 (O O O O N CO O O 0.315 0.330 0 0 O N N O N N M 0 0 0 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 _ 0.348 0.344 0.339 0.334 0.330 0.325 0.321 0.316 0.312 0.307 0.303 0.298 7 O O O) 0) CO Cl N N 0 0 O Storm Rain in/hr 0.035 0.053 0.053 _ 0.071 0.053 0.053 0.053 0.071 0.071 0.071 0.088 0.088 0.088 0.088 CO O CO O O 0 0 0.106 0.123 0.123 0.141 0.106 0.123 0.141 0.141 O) 0) CO OD 0 0 O CO n r 0 0 O 1- r 0) 0 0 0.212 0.229 0.265 0.265 0.282 0.300 0.335 0.353 0.370 0.388 CO (O M ClCD N M O O O RCFC & WCD FAzamaL 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 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 CO N- O O 0.7 0.8 CO n 0 O 0.8 0.8 06)0.0.0.7 0 0 1.2 1.3 1.5 1.5 O h 1.9 2.0 n- N (V N CO (O O T- T- N O 2 0.25 0.50 (0 O h 0 O n- 1.25 1.50 1.75 2.00 2.25 2.50 CO O O N M CO O N (O 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 N O h 0 ^ O 8.25 8.50 N O h 0 QO O) 9.25 9.50 N O h O) O CO (00 n 1- O O O Time Minutes M 45 60 n 001 O O O 135 150 165 180 M O O)M 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 l0 O N M. O O O Unit Time Period T- N M V Lo O r O O O T- Cq CO Tr 0 OD 17 18 19 20 N N N CO 7 N N 25 26 27 28 29 _ 30 l. N M M 33 34 0 O M M 37 38 39 40 N M V 7 V PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm .J W CO$ 451.28 451.29 451.31 451.31 451.33 451.37 451.42 451.48 451.54 451.63 451.71 451.75 451.79 451.85 451.91 451.97 452.02 452.06 452.10 452.12 0 (0 (0 (� V V 452.16 452.16 452.16 452.16 452.16 452.17 452.17 452.17 452.17 452.18 0000 CV 4 U) V V CV NO U) ( V V 452.18 452.18 452.19 452.19 452.19 I 452.19 452.19 Total In Basin cu -ft ac -ft 0.68 0.72 (f) h I- h 0 0 0 CO O 0 0,- CO h O 7 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 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) O (V (V M 29,737 31,229 32,826 33,618 34,968 39,603 44,793 50,992 mr 03 ccr W (0 (0 76,087 80,399 84,805 91,122 97,075 103,118 108,794 114,103 119,044 122,249 W c- 0 03 N 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 I- O) O) O O 110,167 110,836 111,466 112,106 V O N N M (0 117,060 118,254 119,480 119,582 119,683 119,759 0 ((000 CO 0) 0) O) 120,090 120,217 120,319 120,420 120,522 120,598 120,649 120,725 120,827 120,903 120,954 121,030 121,106 121,183 121,233 121,310 121,361 0 m; 29,737 31,229 (0 00 N 0.5 CO M 34,968 39,603 44,793 50,992 57,744 66,868 76,087 80,399 84,805 91,122 97,075 103,118 O0) co CO -l. ,- 119,044 122,249 125,538 125,811 W co CO- 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 O N WV .- ,- 1,597 792 1,350 4,635 0 0) m W O O 6,752 9,123 9,219 4,312 4,406 6,317 5,953 6,043 5,677 5,309 4,940 3,206 0) Nn N M 273 205 205 341 341 341 _ 273 273 273 205 136 205 273 205 136 205 205 205 MM 0 N ,- Flood Hydrograph Flow cfs 0. On O (0 N,- 1.77 0.88 1.50 5.15 0) I- co U) (O O LO N.: 00 c,CV 0) r V 4.90 7.02 co N. (O 660 0 M 01 5.49 3.56 (0 O CO M 07000 O M M N 0.23 0.38 0.38 0.38 0.30 _ 0.30 0.30 0.23 0.15 0.23 0.30 0.23 0.15 0.23 0.23 0.23 (0 M LO N OOO Effective Rain in/hr I� (O O O 0 0 (O M O O 0 0 0.05 0.18 0.20 0.24 CO (O N M O 0 CO M O 0 0.17 0.25 0.23 0.23 0.22 0.21 0)) 0 O 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 O O 0 0 0 O O O Loss Rate in/hr Max I 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 CD ,N 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 CCD 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 0 0 0 0.281 0.277 0.273 0.269 0.265 0.261 0.257 0.253 0.250 0.246 0.242 0.238 0) CO N N 0 0 0.228 0.224 1- N N N 0 0 7 N N 0 0 0.208 0.204 W O 0) N O 0 0.195 0.192 0.189 0.187 7 CO CO 0 0 00 (O N- N- 0 0 co N- N- 0 0 0) (O (0 (O 0 0 7 N (0 (O 0 0 0.160 0.158 (0 mt N lO (0 0 O O O Storm Rain in/hr co M M M O O 0.335 0.300 _ 0.318 0.441 _ 0.459 0.494 cc -N O (O CO 0 0 _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 0.335 0.071 I- 1M O O 0 0 0.053 0.088 0.088 0.088 0.071 _ 0.071 N- 1M O O O O 0.035 0.053 0.071 0.053 0.035 0.053 0.053 0.053 M 1M M O O O O O O RCFC & WCD FAzamaL 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) o 0) N r O) N- r r co (O r N (0 co N N 2.9 3.4 V co M N co (- N N 2.6 2.6 (O V N N 2.3 1.9 co. V , 0 V co 0 0 0.3 0.5 0.5 0.5 _ 0.4 0.4 0.4 0.3 0.2 0.3 mr CO O O 0.2 0.3 0.3 0.3 Cl CO 0 O O O 12 O 2 CD (O CD N • c- 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O (O O N Mi 7 N 14.50 14.75 O (O O N N (0 N 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 O (O O O N (O N N N Time Minutes CO0LO CO (0 690 705 720 735 750 765 780 795 810 825 840 855 870 885 0 ( LO 0) 0) 930 945 00 0 0) 0) 0 O 0) O 1020 1035 N COCOOr- 0 0 _ 1080 1095 1110 1125 1140 1155 1170 1185 1200 1215 1230 1245 0 01 0) 0) 0) Unit Time Period 44 45 46 47 48 49 50 51 N 0 (O (O V 0 (O (f) 56 57 co 0) (O (O O CO (0 N M CO (0 64 65 CO N. CO (0 CO O) CO (O LL OL N M I- 74 75 CO N- N- F. CO 0 � F. O CO 00 82 83 V CO O CO 00 CO PROJECT: CORAL MOUNTAIN Job No.: 2553 BY: DLS DATE 3/30/20 Basin Percolation Rate 0.0 in/hr Maxwell Drywells Number 0 Drywell Percolation Rate 0.00 cfs 0.00 cfm cw .y W 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 ac -ft 3.00 3.01 00000000 N N N M M M M 0, M 0, 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 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 121,437 121,488 121,564 121,615 121,665 121,716 121,767 121,818 121,869 121,920 C N 0 j m ; U 130,790 130,926 131,131 131,267 131,403 131,540 131,676 131,813 131,949 132,086 Volume In cu -ft 205 136 205 136 0 0 M M 0 0 M M 0 0 M C) Flood Hydrograph Flow cfs 0.23 0.15 M (n 0.15 0.15 0.15 0.15 0.15 0.15 N.- 6 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 LoV V V 0.145 0.144 0.143 0.142 V V 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 O O RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z 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) M 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 0 O N V V V Unit Time Period 87 88 O) O N 93 94 lf) (O N 0) 01 0) 01 01 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C.00,,,• MCC, M O N V 7 O O N M O M O U 0 0 O C O O O O O LON M M M M p401 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)(At+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 March 30, 2020 DLS 1 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 HM201 217 IVtEL1°. GSM °�. 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 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 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 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: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE CO N 7 M 0 L- 0 LO d d 0.0346 0.1016 COCO LO CO 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 0JJ 3 O 0 II J C H ° o .,-,2� m U 0 .... - C 0_ i 'R CNOd l C O Y > y G CO IL OO 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 MNJ O AREA WEIGHTED AVERAGE CO 0 o I� 0000 0 CV o Q W K Q 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) 0.05 0.37 0.28 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] 0 0 0 0 0 0O— PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 0.51 RI NUMBER [Plate E-6.1] CO CO LO LO CO CO LO LO LAND USE PAVING/HARDSCAPE SF - LOW DENSITY SF - HIGH DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL=. [I ULM SOIL GROUP [Plate C-1] 0)0)0)0) 7(0 N W 0 d P) N ) m a 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 (0 m> 00 N (V V V 442.06 442.09 442.12 442.17 N CO m� NW N N V V 442.44 442.90 N N V a o (0 C 0.07 0.19 0.32 0.47 0.65 0.87 ° r 2.33 4.70 O O (0 N N F m 0,-.56. °Oo ° N 14,063 20,470 28,169 37,803 0)') r On O 1: 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 (00 (00 N N 0. n N N 1,583 1,606 0 O— Do 1,560 1,562 1,563 1,564 1,566 1,568 .-Ln t---1.-.00 LO LO 1,583 1,606 M O 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 0 ,- 0 ,- 0 0 7)Z.; N N Basin Volume cu -ft N 7 0 1,-00 v of 15,626 22,035 29,735 39,371 51,590 69,298 103,155 206,137 219,287 223,066 d E To U NO .4- (00 4,64(0 7,326 7,972 9,264 11,203 13,787 19,279 35,432 104,565 n ami Flood Hydrograph Flow cfs 1'- CON 1004 N 24.42 26.57 30.88 37.34 45.96 64.26 118.11 348.55 00 ,-CD d)r ,- ,c1.,- 0 U) C t-7,.@ t a, i C W 0.25 0.36 0.39 0.43 00 Loco dc; 0.74 1.03 1.90 5.59 0.79 0.29 Loss Rate in/hr Max 1 Low 0.53 0.62 W (00 00000 r W 0) W 1.92 5.07 m N MO 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 N M0 0 h 000000'-'-c-l0'-0 W 0- 0.00 00-' 0.- 00000 4 01 0.- 0 RCFC & WCD G 7DGi0O1. Wf NIG1Gfl. IMIL 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) 3.6 4.2 4.4 4.6 OO 66 6.4 8.1 13.1 34.5 ('-0 0M Time Minutes Hours CON -LOM 0. -NM O O O O 0.42 0.50 0 0. m o O O NMN n 0 O O O rn o O 0 oO m N 25 30 35 40 45 50 55 _ 60 Unit Time Period ('40') V 4) 0 0. 0 0 0'- N C C(0 W(0(0 J C C U O } U 0 p U (0 U 00)) N U M 00 (0 N N (- U com O 0 (0M V,,p O W 2 CC O M 0 uj 2 M 0 N N CO V) W 2 J > W G Q 0 o w o z J p LL W W W ~ Z W ( U` W � J R„ J z W W O P O O Q• Z o W>?�y ,za f • R' J v`ni >>> W W w o m 0 W Q W O W O O» Y Q cloLL m W r z J W O 0 0 0" Q F W W 1- 40 O W LL LL 0 (0 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 c -j (p C0 0 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 0000 CV (V vavv (V (V 442.05 442.07 442.08 442.10 442.14 442.16 442.19 442.21 442.24 U (O ; C N 0.00 0.00 000000 0 0 0 0 0 0 0 0 0 0 0 0 000 0 0 0 0 0 0 0 0 0.05 0.10 0.15 0.18 0.27 0.37 0.44 0.55 0.72 0.86 Cf) COi- T N O Om @ 0r j U 0 0 0 0 0 m 0 194 387 0 0 194 O (Oj mr N7 CO 0 1I j (00 (O C. 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 936 936 NM 0) co 313 1,560 N. (OO N 1n 1,560 700 CO 0 1 0)n 1,560 1,561 1,561 1,561 1,562 1,563 1,564 1,565 1,567 1,568 1,569 1,571 1,572 1,560 1,560 00 11 4D 1,559 1,560 1,560 1,560 1,560 1,560 1,560 1,560 0000 N 4D N 0 1,562 1,563 00 N 0 0001` N 0 r N 0 N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 10 10 CO CO 10 10 7 V N N N N 1() CO t0 10 10 V V N N N N (0 CV (O T- 10 CO V V N N N N N r T- 10 (O V V N N N N 224,618 224,578 N CO T- to CO V V N N N N 224,681 224,750 224,818 224,856 224,987 225,134 ,C O 0)10 N co 10 10 N N N N 225,621 225,830 226,008 226,201 226,410 Basin Volume cu -ft 936 936 792 313 CO M N. 507 1,753 0 0) O0 793 1,753 3,867 5,981 8,094 9,246 _ 13,279 17,791 CO CO(0 0 L0 N N 0) N 0) co co _ 44,655 50,600 57,024 Volume In cu -ft (O CO CO OD CP 0, 792 313 M co c�� M co (ham N- co CO ^m N- 793 1,753 3,674 3,674 T- r CO 1 C6 N 10 0 In CO - D 4,634 6,074 8,955 7,995 7,034 7,515 7,995 Flood Hydrograph Flow cfs N T- T- MM 2.64 1.04 1.04 5.84 1.04 5.84 5.84 1.04 CO N1!") 12.25 12.25 N Q �O 18.65 20.25 7 N N -N 29.85 26.65 23.45 25.05 26.65 Effective Rain in/hr 0.05 0.05 7 N 0 0 0 0 N 0) 0 0 0 0 N 0) 0 0 0 0 W N 0 0 0 0 7 0) 0 0 0 0 0.20 0.20 O )0 N,- O O 0.30 0.32 0.25 0.32 0 co 7 a O O 0.38 0.40 0.43 Loss Rate in/hr Max 1 Low co 007 N N O O co N M O O 0.33 0.39 0.33 0.39 0.39 0.33 Lc) co CO CO O O ODOO 'Cr V O O 0.48 0.44 N- 0) 10 LO 0 0 N0) 10 LO 0 0 NN I� CO 0 0 CO LL7 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 M M 0 0 M M 0 0 M M 0 0 M M M 0 0 0 Storm Rain in/hr co M 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(0 O O CON0 O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD MUDDI3o©I1= Ctrl FACACME 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 T- 10 10 CO 1n W 1.8 1.5 (O 0 N- (V N N N 2.2 2.0 co N. NN V r NN CO Ci Ci 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 0N) 0 0N- N CO 1.42 1.50 1.58 1.67 r CO T- 1.92 2.00 2.08 _ 5 10 15 20 N M 35 40 45 50 55 60 65 70 75 80 OCD 00) 00)) O _ 105 110 ..00 1f) T- T- T- Unit Time Period T- N M 10 40 r CO O N. N, 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 03 442.29 442.36 % % 442.62 442.76 442.84 442.85 442.85 442.85 442.84 1.54 1.90 2.09 2.64 3.25 3.96 4.42 4.44 67,152 82,690 141,764 172,644 NJ' C6 193,738 193,888 192,717 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 1,575 1,578 1,580 1,586 1,592 1,599 1,603 1,604 0 0 0 CO CO CO 1,575 1,578 1,580 1,586 1,592 1,599 CD CD CD CD CD 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 01 N CV N CO CV CV 230,868 230,904 230,909 230,914 230,876 Basin Volume cu -ft 68,727 84,269 92,605 116,783 LO ml. co cu 194,081 195,192 195,342 195,491 194,320 \: gammt 13,276 17,116 %\ 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 CD CO CO mro Effective Rain in/hr 0.53 1.38 1.15 0.15 Loss Rate in/hr Max I Low 1.29 0.44 0.37 0.37 0.37 0.37 0.37 0.37 0.37 0.37 Storm Rain in/hr 1.52 0.51 0.46 0.46 0.15 RCFC & WCD GOO oDD o@E Ctrl FACACME 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) 3.5 6.8 5.9 2.0 Time Minutes Hours 2.50 2.58 2.67 2.75 LOco cm,co 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 «;/ \0)(0 (0 \\)}} 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 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 5 0 0 C C 7175 N 0 0 0 0 0 0 0 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 Om N C U 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 (00 (0 1) _ _ 0 0 0)) 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ 0 0 N 0 _ _ SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area J sf 224,570 _ 224,573 224,573 224,573 224,573 224,576 224,576 224,576 224,576 224,576 224,576 224,579 224,579 224,579 224,579 224,579 224,579 _ 224,579 224,579 _ 224,579 224,579 _ 224,579 224,579 f 224,582 E0) 0 0 J co if,0 U V I- (0 (0 7 (0 n r (0 (0 1.0 (0 n O (0 (0 (0 (D O O (0 (0 CO (D O O 1.0 (0 (0 (D O M 1.0 V CO I� co M V V r r M(0 V V r r M(0(0(0(0(0(0 V V n r V V n r V V n r (D V M n co U) E 5 O U — J 464 557 557 557 557 650 650 650 650 650 650 743 743 743 743 743 743 743 743 743 743 743 836 Flood Hydrograph Flow cfs 1.55 1.86 (0 (0 row O N- c9 N r r N N 0-0-0-0)0(00(0(0(0(0(0(0(0 N N N-00 T- v N N v v N N v v N N v v N N v v N N v v N N 2.48 2.79 U) C U '(p L WCC 5 W 0I(0(0(0(0(0(0(0(0(0 000000000000000000000000 666666666666666666666666 CO 7 7 7 7 a 7 a 7 a 7 a 7 a Loss Rate in/hr Max 1 Low _ nr 0- 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 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 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 MUDDI3o©I1= Ctrl 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 C L) :) U W N a a m ET_ (nO O C D W. O C D W. O C D n0- O C D n0- O C D h, OD O C D CO (0 O C D CO (0 O C D O (0 O C D O (0 O C D O (0 O C D O0 O C D Time Minutes Hours 0L- O O 0.25 0.33 0.42 0.50 (00(0D O O 0.75 0.83 0)007 O NM 1.42 1.50 1.58 1.67 1.75 1.83 MEM 2.00 O (0 O N (0 O N (0 (0 O (0 a (0 O s (0 (0 O (0 (0 (0 O (0 0- (0 O r O (0 O (0 0) (0 0 0) cp 0 CD cp n- 0 CD Unit Time Period N N CO V (0 O r CO O O,_ N,- 7 15 16 h- CO 0) O N 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 C J W a) 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 0 U f0 C C N 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 0 0 0 0 06 c- y- 0 0 06 CO 0 00 . 0 0 OD N 0 7 0 0 0 co 7 N . 0 0 O W m 0 U 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 221 _ 441 1,280 _ 2,120 3,578 _ 5,036 T O T CO N. Dj Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft M 000000000) V C) 1 CO CO CO CO CO CO N N 00) N N ON N 0 T- NN 0 0 T- T- NO V 1'' T- (0000 “D XD T- T- (0000 “D XD T- T- 00 “D XD T- T- ,00 “D XD T- T- 1,560 1,560 O O 0 0 10 10 O O 0 0 10 10 O O 0 0 10 10 O O 0 0 10 10 O O 0 0 10 10 O O 0 0 10 10 O O 0 0 N 0 O O 0 0 N 0 O O 0 0 N 0 O O 0 0 N 0 0 (ID N 0 1,562 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C .@ O] OInm O y E.‹ d 0)N h 0O 1)7010 NNNNNNNNNNNNN N N NN CO N N NN CO CO N N NN CO CO mIn N N 0)00)00000 CO CO 0 1)7 N N CO CO 01)7 N N CO CO 01)7 NNNNNNNNNNN N N CO CO 00 N N MM I) CO 00 N N MO N c010 N N N-0 - 0 cD co N N NO N r n r N N 1-0 0 N OO) •71-- N N Basin Volume cu -ft 743 836 836 836 836 836 836 836 N N N N 929 1,022 o o V Y- 1,780 2,001 2,841 3,680 5,138 6,597 0) 400 M 0 E w = C j U co 0 0 M I� OOOO00000) 0 0 M 0) 0 0 M 0) 0 0 M 0) 0) 0) N N 0) 0) N N 00) N 0) N N 0 0)T- N F18 N N 0 0 T- T• N 0 0- 0� O 0 0 1- 1 X. O O 0 0 '1:- 0 N 0) d 1 0 0 MM 0 1- M 1)) 0 N Ma Flood Hydrograph Flow cfs 2.48 2.79 CD m N N � m N N n m N N o 0 M C7 0 0 M C7 0 M C7 M M 1.81 3.87 5.93 5.93 8.00 8.00 o 0 66 66 CO T c4,f )1) > C U 'Ip r Q' C W 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 010 0 0 0 0 0 10 0 0 0 0 0 10 0 0 0 0 8 10 0 0 0 0 M 0 0 0 0 0 0 0 6 6 0 0 0 6 6 c"'"' 0 0 0 0 6 6 0 0 0 0) 6 N 0 0 Loss Rate in/hr Max 1 Low 0.23 0.25 0 07 NN . O O 0 07 NN O O 0 07 NN O O O O NN O O O O NN O O O N0) O O CO) O O 0.34 _ 0.37 0 0) CO) O O N N 0 V O O 0.45 _ 0.45 O 71)7 . O O I— n c7 c+) CO 0 0 1` ) M M 0 0 1` ) M M 0 0 1` 1` M M 0 0 1` f` M M 0 0 r f` M M 0 0 I� f` O7 M 0 0 1` r M M 0 0 1` r M M 0 0 t` r M M 0 0 t` r M M 0 0 t` r M M 0 0 1` N- 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 C7 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 GOO oDD o@E Ctrl NIGICML \E 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% 0) C C 0 0 V W 5O) a a m E m 0 0 0 00) 0 0 00) 0 0 00) 0 0 0000077. T- T- T- T- T- T- 7 T- T- NM,t T- T- 7000.01-0 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 cri 3.42 3.50 3.58 3.67 r co M M 3.92 4.00 4.08 4.17 1)) O N M T- X 10 O M'0 10 O 01)70001' T 10 O T 10 O T- T- 10 O 1`O T- T 10 O Om T 10 O 0)OO N 10 O N N 10 O N N N 10 O NM N N 10 O 0)77 N N 10 O 0 N N Unit Time Period 1n O1�0 N N N N 29 30 31 32 Ma M M 35 36 I"- CO M M 39_ 40 41 42 Ma 7 7 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 C J W N (O 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 CO 1 INC V 442.63 442.74 442.76 442.75 LO r N N et 7 442.74 442.73 w U (0 C To N 0 CD M(0 0 0 O O O (0 0 0 N O N- W 0 0.-.-.-.-.- O O 0I-. N- CO MIv, CO O N -I07 (V N- T- W (V N CO CO N C00(0) CO M CD 7 M M N 0 O1 W CO M OO co OW CO M O @ m ~ S U 13,121 17,053 21,603 26,152 CO CO M� CO M 43,506 49,907 CO N W ai 70 75,292 89,114 0) N ISM I. 10 7 M 0. CO 10 N. 172,408 _ 171,645 170,604 _ 169,470 168,151 _ 166,740 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft C) 7 (0 O 0) N O (0 c0 VD O O I-, W OD (0 O O O r r O O M7 r r O O h O r 00000000000000 O O M( O OO N000O O OO 00 OO CO 00 00 OO W r 00 OO M 7 CO 0 (0 u) O (0 CO (O O O n CO (O O OO CO r-- N. (O O CO 7 r-- N. (O O n 0 r00 (O O CO r co CO (O 0) N CO 00000000 N 0) 0)000 N 0) CO N 0) 00 N - N 0) SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 225,033 225,161 225,309 225,457 225,625 225,813 226,021 226,230 226,458 226,706 O O O 0 0 O h. h N N N N 228,015 228,586 229,257 230,109 230,215 _ 230,190 230,157 _ 230,120 230,077 230,031 Basin Volume cu -ft 14,684 18,616 23,167 27,717 O N- CO I- CO (0 N W MM _ 45,076 51,478 CO (0 0) CO 7 00 (O (0(O 76,868 90,694 106,374 123,908 144,534 170,728 174,006 173,244 172,202 171,068 169,749 168,337 O) O U W 7.- 7 On O O r co O I� cn O^) r r 000 N W OC CON M 7 N Or N t)i MOO N n N I� N N op (0 W (f (70 0 7 r 00 N Flood Hydrograph Flow cfs 16.25 18.32 CO COCO7 N N N 0 N 26.57 _ 26.57 28.64 30.70 41.02 51.34 (ul r (00 (M0 74.04 92.62 16.25 2.79 (0 O OD O CO N 0(0 0 0 co C s' i.; Q' C w OO 0 0 MM 0 0 M0 0 0 MM00088 0 0 0 0 0 0 NN 0 0�0 N7 0 0 MN 0 0 OO 0 0 Loss Rate in/hr Max 1 Low 0.53 0.56 0.59 0.59 N O (O (0 0 0 CO W CD (O 0 0 O CO I,- rM 0 0 0.87 1.01 O W T- T- N W O N v- CO O O N O O 0.17 _ 0.14 OD (0 O O O6 r 10 M MM . 0 0 10 10 . M 0 0 10 10 M M 0 0 n 10 M M 0 0 10 10 M M 0 0 r 10 M M 0 0 r 10 M M 0 0 C` r M M 0 0 t` r M M 0 0 t` r M M 0 0 10 I- M CO 0 0 Storm Rain in/hr (MO COO 0 0 O N.O 0 0 0.73 0.76 0.79 0.79 0.83 0.86 CO ..-.- 0) 0) 1.56 1.85 COMCD CO O O 0.20 0.17 O— 0 O O RCFC & WCD GOO DDD o@E Ctrl NIG3MML \E 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) O O N H (V 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 0 0 .- 0 0.6 0.5 M N O O Time Minutes Hours 0) (+) N CO 7 7 N 0 7 O 7 7 CO r O O a a O CO r CO a a N 0 CD O a 16 CO r O N- LO LO O CO N M LO LO N 0 7 O (f) if CO r O 0 (f) if O CO I,- CO (f) Lf N O CD O 10 (0 O0 O (O N N (0 0 CO r N N (0 0 r M N N (0 0 CO 0 N N (0 0 CD 0 N CO (0 0 0 CO CO (0 0 N CO CO (0 0 N M CO CO (0 0 co 7 CO CO (0 0 7 O CO CO (00 O (O CO CO Unit Time Period 51 52 53 54 55 56 57 58 0C N CD 63 64 0 (0(00 67 _ 68 CO00 ^ N -N. EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY (000 C@ U@ O U t V V U CONC O O CO CO (N0 N 00 CO SCO MCD?N N (0,- O M O N CO 0 0 N 1- z 0 W W F W gg wuw1Q J� ZWWOO ¢00 w OLe/ 2 7 a z 4 J (0 w j O O W W w O< w ceww-1 °3 JQOI-0c(--> W_j O 0 7 0 OLwi000W W0> I- M O W LJi LJi cere 2 a O Q 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 J W CO 442.00 442.00 442.00 _ 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 442.00 Total In Basin cu -ft 1 ac -ft 0 0 O O 0 0 O O 0.00 0.00 0.00 0.00 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 0.00 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 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 0 0 0 0 0 0 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 297 445 445 594 445 445 445 594 594 594 742 742 742 742 742 890 0) O (0 CD O 1,039 1,187 0) O (0 '" O I- I` O N 1,336 1,336 1,484 1,484 1,484 1,632 0) CO N IT Cr, T- 2,226 2,226 2,374 2,523 2,820 2,968 3,116 3,265 O (O CO N N (O N N 0) N N N 4,678 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 I 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 4,679 _ 4,679 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 CO O CO V .1 .1.- 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% 0 0 0 ts La O ;•L'N U 0 d 224,565 224,569 224,569 224,574 224,569 224,569 224,569 224,574 224,574 224,574 224,579 224,579 224,579 224,579 224,579 224,584 224,584 224,589 224,589 224,594 224,584 224,589 224,594 224,594 224,598 224,598 224,603 224,603 224,603 224,608 224,613 224,618 224,627 224,627 224,632 224,637 224,647 224,652 224,656 224,661 224,627 224,627 224,652 C 0 m 0 (� 297 445 445 594 V V 7 a 445 594 594 594 742 742 742 742 742 890 0)0 0 0 O, 1,039 1,187 0)0 0 Co O,- 1,187 1,187 1,336 1,336 V V V CO T- T- 1,484 1,632 1,781 1,929 2,226 2,226 2,374 2,523 2,820 2,968 3,116 3,265 CO CO CO N N(0 N N N Volume In cu -ft 297 445 445 594 445 445 445 594 594 _ 594 742 _ 742 742 _ 742 742 890 890 1,039 1,039 1,187 890 1,039 1,187 1,187 1,336 1,336 1,484 1,484 _ 1,484 1,632 CO N Is 0) 2,226 2,226 2,374 2,523 2,820 2,968 3,116 3,265 N N ((00 N N O N N ,,1 Flood Hydrograph Flow cfs 0.33 0.49 0) O ch O O6 0.49 0.49 0) O ch O O6 CO O CO O O6 _ 0.82 0.82 _ 0.82 0.82 0.82 0.99 0) (0 0) c- O � 1.15 1.32 0) (0 0) Y- O � 1.32 1.32 1.48 1.48 1.65 1.65 (0 O W ,.- ..-N 1.98 2.14 2.47 2.47 2.64 2.80 3.13 3.30 3.46 3.63 I- h O V7 M . . . N M Effective Rain in/hr 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 0 0 0 O 0 01 0 O 0 01 0 O 0 01 0 O 0 01 0 O 0 01 0 O 0 0 0 O 0 0Ct' 0 O O 0 0 O O 0.04 0.04 0.04 0.04 0.05 0.05 0 CO O O 1.0 0 0 0 O O O Loss Rate in/hr Max 1 Low O 1!) CO O O O O 0.045 0.060 0.045 0.045 0.045 0.060 O 0 0 0 O O O O 0.075 0.075 0.075 0.075 0.075 0.090 O O O) O O 0 0 (0 O O_ e- N 0 0 O )f) 0) O 0 0 0 0.120 0.120 0.135 0.135 O O (0 (f) 0 0 O )f) O O 0 0 O )f) a_O 0) 0 0 0.225 0.225 0.240 0.255 (4) O CO 0 N CO O O 0.315 0.330 (4) (0 O N N O N N M 0 0 0 107 O CO O O _ 0.636 0.628 N CO CO CO O O CO CO O O O 0.591 0.584 0.577 0.570 0.563 0.556 0.549 0.542 0.535 0.528 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 0.432 0.426 0.420 0.414 0.408 0.402 0)0) M M O O LCD (0 .1. M M M O O O Storm Rain in/hr 0.035 0.053 0.053 _ 0.071 0.053 0.053 0.053 0.071 0.071 0.071 0.088 0.088 0.088 0.088 co O CO O O O O 0.106 0.123 0.123 0.141 0.106 0.123 0.141 0.141 O) 0) N O 0 0 CO VD n n 0 0 CO 1- n 0) 0 0 0.212 0.229 0.265 0.265 0.282 0.300 0.335 0.353 0.370 0.388 O O CO ClVD N M O O O RCFC & WCD FAzamaL 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 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 CO N- O O 0.7 0.8 CO n O O 0.8 0.8 O) 0. 0 0 O O l. TT. O 7 ,, T- 1.2 1.3 1.5 1.5 O h T- T- 1.9 2.0 Y- N (V NT- O O O T- (V 0 2 0.25 0.50 10 O Os 0 O Y- 1.25 1.50 1.75 2.00 2.25 2.50 (0 O Is O N M (0 O N 10 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 (0 O h 0 1 O 8.25 8.50 N ON h 0 O 6 9.25 9.50 h O O) O N 100 n O O O Time Minutes LID M 45 60 n OOjO 0 O 135 150 165 180 O O O)M(0 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 10 O CO O Unit Time Period T- N M V 0 co I� 0 0) OT- Cq CO Tr U1 ON 17 18 19 20 N N CO 7 N N 25 26 27 28 29 _ 30 N M M 33 34 (0 O M M 37 38 39 40 N M 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 Iii fn CO 442.00 442.00 442.00 442.00 442.00 442.00 442.01 442.03 442.06 442.10 442.15 442.16 442.16 442.18 442.20 442.22 442.24 442.25 442.26 442.25 442.25 442.23 442.21 442.19 442.18 442.16 442.14 442.12 442.11 442.09 442.07 442.05 O O W 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 ac -ft O O 0 0 . 0 0 O O 0 0 0 0 O N 0 0 0 0 N- h 0 c- 0 0 0.30 0.55 0.80 0.82 0.84 0.95 1.05 1.15 7(0 N M ‘. S. CO M M T. S. O M N ‘. S. T- N T7 O ‘. S. 0.92 0.83 0.74 0.65 0.55 0.46 0.36 0.27 (O N- N. O O O 0.00 0.00 0.00 0.00 0.00 0.00 0 0 0 O O O O O O O 0 0 0 0 858 CV U1 00) 01 N N. 13,045 23,921 35,064 35,593 I 36,389 41,401 45,681 I 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 O 0D CO (n op , 0a) Ns N 0 0 0 0 0 0 0 0 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 2,968 2,820 N CO 00(00 N N Ns W N 7 4,683 4,686 4,690 4,698 4,705 4,706 4,706 4,709 4,712 4,715 4,718 4,720 N N Ns r 7 V 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 CO (O 07 C) 7 297 445 (O (O 7701701 7 7 Is (O Is N 7 N 4,680 4,680 4,680 4,680 4,680 4,682 4,683 4,686 00) 00) 0 0 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 co co r N- 0 0 (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% Percolation Area sf N N- 0 7 CO 0 N N N N 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 0 0 N 0 7 (O0 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 C N .N 2 7 m; w w j 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 ON 0 0 '- 3,531 445 297 445 445 445 0) 0 01 7 O) W N 7 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 Y- O 0 Ns 0 R 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 CD N 7 Ncy Flood Hydrograph Flow cfs O (MM Cr) N— cn Ci OI N— CO C6 NN -0I- CZ .t— 0N.: W LO O 11.50 17.30 17.61 5.82 00) (0 OC) 00 O0) C), CO0 W co N - C) 3.94 0.66 00) 07 0O 0.49 0.82 N N00001 (000007 000000 0.33 0.49 001 07 OO 0.33 0.49 0.49 0.49 M01M C)7 CO 000 Effective Rain in/hr 0.05 0.05 CO 7(O O O 0 0 CD O 0 0 CV CO 0 0 0.18 0.28 0.28 0.09 O Ns O 0 CO O 0 0.15 0.14 CO 00 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 O O 0 0 O O 0 0 0 O O O Loss Rate in/hr Max I Low 0.300 0.285 0.285 0.255 0.270 0.375 0.390 0.420 0.435 0.510 0 LO 7 0 co O O U1 7 0 co 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 CD 0 (00 CO OO 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 000 0 0 0 0.369 0.363 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 1O N N N 6 O 7 ,N N N O O _ 0.241 0.237 0.234 0.230 0.227 0.224 0.221 0.218 0.215 0.212 0.209 0.207 O O CCD Cl N Y- 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 O 0 0 O O _ 0.600 0.406 _ 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 0.335 0.071 N- 1M O O O O 0.053 0.088 0.088 0.088 0.071 _ 0.071 Ns 1M O O O O 0.035 0.053 0.071 0.053 0.035 0.053 0.053 0.053 M 1M M O O O O O O RCFC & WCD FAzamaL 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) 00)0) N r (-0000 r r r N N N 2.9 3.4 7 CO C) N CO (s N N 2.6 2.6 (O7 N N 2.3 1.9 0) 77 , O CO O O 0.3 0.5 0.5 0.5 _ 0.4 0.4 0.4 0.3 0.2 0.3 7 CO O O 0.2 0.3 0.3 0.3 Cl CO CI O O O 12 0 2 O 0 O N • 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 O IO O N 7 7 14.50 14.75 O 0 O N N 0 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 O 10 O O N 0 N N N Time Minutes (OO (0 CO CO 690 705 720 735 750 765 780 795 810 825 840 855 870 885 0 0 0) 0) 930 945 (00 n 0) 0) 0 O 0) O 1020 1035 N (00 0 0 _ 1080 1095 1110 1125 1140 1155 1170 1185 1200 1215 1230 1245 (00 LO 001 CV CV CVCV l. Unit Time Period 44 45 46 47 48 49 50 51 N C)70 0 (O 0 (O 56 57 (0010 0 (O 0 0 N CO 0 0 64 65 0Is(O01 0 0 CO 0 LL OL N C) Is r 74 75 0N -(O0)0 h Ns h Ns CO 00 82 83 700 CO CO 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 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 O O 0.00 0.00 0 0 0 0 0 O O 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 N 445 297 297 297 297 I's N.- 71- a W 0) 0) N N N 0) r 4,678 4,679 4,678 4,678 4,678 4,678 CO CO CO I` n N- CO O O O OD 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% Percolation Area sf O 224,565 224,569 224,565 224,565 224,565 224,565 224,565 224,565 224,565 CO O dr N N 0 297 445 •C _ 2 7 j a o) O) W O) W 0) 0) CO Z U N N N N N N N Volume In cu -ft N 445 297 297 297 297 I` n N.- 71- 7 7 O O) O) N N N Flood Hydrograph Flow cfs 0.33 0.49 M M M M MM M O O O O O O O O Effective Rain in/hr 0.01 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Loss Rate in/hr Max Low r 0.045 0.030 0.045 0.030 0.030 0.030 0.030 O O O co co co O O O O O O O0) 0.195 0.193 O) o co W co W W O 0 0 0 0 0 0 0 Storm Rain in/hr 0.053 CO Lco O 0.035 0.035 0.035 0.035 CO CO CO O O 00 0 0 0 000 RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z 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) M 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 M M V 2 N N N Time Minutes 1305 1320 1335 1350 1365 O4) O4) O CO 0) co C+) N V -V V Unit Time Period 87 88 89 O N co 7 ,n CO 01 01 01 01 01 03 03 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY ( C C U U C V U V V - V O f6 f6 coO N U M W co O 7 . M 7 O) m ui Oi,-O �,- O)N co co m N N s- 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 (Et — E2 )(At + A2 + VAiA2 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 FUTURE BASIN DA -F 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 4 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT 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 (For Storms Greater Than 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR 2,000 ft 1,000 ft 467.0 ft 455.0 ft 0.02 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 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 2.14 FUTURE BASIN [2] AREA DESIGNATION RAINFALL VOLUME (cuft) DA -F [3] AREA - ACRES 448,954 44.811 [4] L -FEET 60,714 2000 [5] L -MILES 560,808 0.379 [6] La -FEET 1.07 1000.00 [7] La -MILES FLOOD VOLUME (cu -ft) 0.189 [8] ELEVATION OF HEADWATER 176,875 467 [9] ELEVATION OF CONCENTRATION POINT 3.98 455 [10] H -FEET 3.59 12 [11] S-FEET/MILE 78.28 31.7 [12] SA0.5 5.63 [13] L*LCA/SA0.5 0.013 [14] AVERAGE MANNINGS'N' 0.02 [15] LAG TIME -HOURS 0.09 [16] LAG TIME -MINUTES 5.5 [17] 100% OF LAG -MINUTES 5.5 [18] 200% OF LAG -MINUTES 11.0 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 NOAA ATLAS 14 [3] 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 DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR TOTAL RAINFALL (in) 1.44 2.14 2.76 4.41 RAINFALL VOLUME (cuft) 234,237 348,102 448,954 717,351 SOIL LOSSES (cuft) 60,714 174,628 272,079 560,808 EFFECTIVE RAIN (in) 1.07 1.07 1.09 0.96 FLOOD VOLUME (cu -ft) 173,523 173,475 176,875 156,543 (acre -ft) 3.98 3.98 4.06 3.59 PEAK FLOW (cfs) N/A 78.28 66.94 12.58 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) CO o CO O N 0 (O O O 0.0311 ' - CO CO O -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 .E. o N JJ 0 OM J IJ , J o E d m °Jym v v d - 0 'Ip . a 0 ore 0 c'a o 0 > m m `O — G m LL 0 LOW LOSS RATE PER RCFC/2322 (in/hr) 0.1000 0.6600 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0004 0.3553 (0 O O MNU3 d AREA WEIGHTED AVERAGE 0.008 0.954 0.038 co W K Q 0.353 42.760 c SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.37 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] G o0 O, M O0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 RI NUMBER [Plate E-6.1] co co ... (D LAND USE PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL°MUL°.L SOIL GROUP [Plate C-1] 03 03 CO 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 44.81 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 5.49 UNIT TIME -PERCENT OF LAG 91.1 TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.37 LOW LOSS RATE - PERCENT 85% 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 0.62 0.37 0.53 0.25 11.24 2 10 0.17 4.2 0.73 0.37 0.62 0.35 15.93 3 15 0.25 4.4 0.76 0.37 0.65 0.39 17.49 4 20 0.33 4.6 0.79 0.37 0.68 0.42 19.05 5 25 0.42 5.0 0.86 0.37 0.73 0.49 22.17 6 30 0.50 5.6 0.97 0.37 0.82 0.59 26.86 7 35 0.58 6.4 1.11 0.37 0.94 0.73 33.11 8 40 0.67 8.1 1.40 0.37 1.19 1.03 46.38 9 45 0.75 13.1 2.26 0.37 1.92 1.89 85.42 10 50 0.83 34.5 5.96 0.37 5.07 5.59 252.51 11 55 0.92 6.7 1.16 0.37 0.98 0.78 35.45 12 60 1.00 3.8 0.66 0.37 0.56 0.28 12.80 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) 1.44 234,237 60,714 1.07 3.98 173,523 252.51 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 44.81 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 5.49 UNIT TIME -PERCENT OF LAG 91.1 TOTAL ADJUSTED STORM RAIN -INCHES 2.14 CONSTANT LOSS RATE-in/hr 0.37 LOW LOSS RATE PERCENT 85% 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 0.33 0.37 0.28 0.05 2.26 2 10 0.17 1.3 0.33 0.37 0.28 0.05 2.26 3 15 0.25 1.1 0.28 0.37 0.24 0.04 1.91 4 20 0.33 1.5 0.39 0.37 0.33 0.01 0.54 5 25 0.42 1.5 0.39 0.37 0.33 0.01 0.54 6 30 0.50 1.8 0.46 0.37 0.39 0.09 4.02 7 35 0.58 1.5 0.39 0.37 0.33 0.01 0.54 8 40 0.67 1.8 0.46 0.37 0.39 0.09 4.02 9 45 0.75 1.8 0.46 0.37 0.39 0.09 4.02 10 50 0.83 1.5 0.39 0.37 0.33 0.01 0.54 11 55 0.92 1.6 0.41 0.37 0.35 0.04 1.70 12 60 1.00 1.8 0.46 0.37 0.39 0.09 4.02 13 65 1.08 2.2 0.56 0.37 0.48 0.19 8.66 14 70 1.17 2.2 0.56 0.37 0.48 0.19 8.66 15 75 1.25 2.2 0.56 0.37 0.48 0.19 8.66 16 80 1.33 2.0 0.51 0.37 0.44 0.14 6.34 17 85 1.42 2.6 0.67 0.37 0.57 0.29 13.30 18 90 1.50 2.7 0.69 0.37 0.59 0.32 14.46 19 95 1.58 2.4 0.62 0.37 0.52 0.24 10.98 20 100 1.67 2.7 0.69 0.37 0.59 0.32 14.46 21 105 1.75 3.3 0.85 0.37 0.72 0.47 21.43 22 110 1.83 3.1 0.80 0.37 0.68 0.42 _ 19.11 23 115 1.92 2.9 0.74 0.37 0.63 0.37 16.78 24 120 2.00 3.0 0.77 0.37 0.65 0.40 17.95 25 125 2.08 3.1 0.80 0.37 0.68 0.42 19.11 26 130 2.17 4.2 1.08 0.37 0.92 0.71 31.87 27 135 2.25 5.0 1.28 0.37 1.09 0.91 41.15 28 140 2.33 3.5 0.90 0.37 0.76 0.53 23.75 29 145 2.42 6.8 1.75 0.37 1.48 1.37 62.04 30 150 2.50 7.3 1.87 0.37 1.59 1.50 67.84 31 155 2.58 8.2 2.11 0.37 1.79 1.73 78.28 32 160 2.67 5.9 1.52 0.37 1.29 1.14 51.60 33 165 2.75 2.0 0.51 0.37 0.44 0.14 6.34 34 170 2.83 1.8 0.46 0.37 0.39 0.09 4.02 35 175 2.92 1.8 0.46 0.37 0.39 0.09 4.02 36 180 3.00 0.6 0.15 0.37 0.13 0.02 1.04 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) 2.14 348,102 174,628 1.07 3.98 173,475 78.28 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 44.81 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 5.49 UNIT TIME -PERCENT OF LAG 91.1 TOTAL ADJUSTED STORM RAIN -INCHES 2.76 CONSTANT LOSS RATE-in/hr 0.373 LOW LOSS RATE - PERCENT 85% 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 0.166 0.37 0.14 0.02 1.12 2 10 0.17 0.6 0.199 0.37 0.17 0.03 1.35 3 15 0.25 0.6 0.199 0.37 0.17 0.03 1.35 4 20 0.33 0.6 0.199 0.37 0.17 0.03 1.35 5 25 0.42 0.6 0.199 0.37 0.17 0.03 1.35 6 30 0.50 0.7 0.232 0.37 0.20 0.03 1.57 7 35 0.58 0.7 0.232 0.37 0.20 0.03 1.57 8 40 0.67 0.7 0.232 0.37 0.20 0.03 1.57 9 45 0.75 0.7 0.232 0.37 0.20 0.03 1.57 10 50 0.83 0.7 0.232 0.37 0.20 0.03 1.57 11 55 0.92 0.7 0.232 0.37 0.20 0.03 1.57 12 60 1.00 0.8 0.265 0.37 0.23 0.04 1.80 13 65 1.08 0.8 0.265 0.37 0.23 0.04 1.80 14 70 1.17 0.8 0.265 0.37 0.23 0.04 1.80 15 75 1.25 0.8 0.265 0.37 0.23 0.04 1.80 16 80 1.33 0.8 0.265 0.37 0.23 0.04 1.80 17 85 1.42 0.8 0.265 0.37 0.23 0.04 1.80 18 90 1.50 0.8 0.265 0.37 0.23 0.04 1.80 19 95 1.58 0.8 0.265 0.37 0.23 0.04 1.80 20 100 1.67 0.8 0.265 0.37 0.23 0.04 1.80 21 105 1.75 0.8 0.265 0.37 0.23 0.04 1.80 22 110 1.83 0.8 0.265 0.37 0.23 0.04 1.80 23 115 1.92 0.8 0.265 0.37 0.23 0.04 1.80 24 120 2.00 0.9 0.298 0.37 0.25 0.04 2.02 25 125 2.08 0.8 0.265 0.37 0.23 0.04 1.80 26 130 2.17 0.9 0.298 0.37 0.25 0.04 2.02 27 135 2.25 0.9 0.298 0.37 0.25 0.04 2.02 28 140 2.33 0.9 0.298 0.37 0.25 0.04 2.02 29 145 2.42 0.9 0.298 0.37 0.25 0.04 2.02 30 150 2.50 0.9 0.298 0.37 0.25 0.04 2.02 31 155 2.58 0.9 0.298 0.37 0.25 0.04 2.02 32 160 2.67 0.9 0.298 0.37 0.25 0.04 2.02 33 165 2.75 1.0 0.331 0.37 0.28 0.05 2.24 34 170 2.83 1.0 0.331 0.37 0.28 0.05 2.24 35 175 2.92 1.0 0.331 0.37 0.28 0.05 2.24 36 180 3.00 1.0 0.331 0.37 0.28 0.05 2.24 37 185 3.08 1.0 0.331 0.37 0.28 0.05 2.24 38 190 3.17 1.1 0.364 0.37 0.31 0.05 2.47 39 195 3.25 1.1 0.364 0.37 0.31 0.05 2.47 40 200 3.33 1.1 0.364 0.37 0.31 0.05 2.47 41 205 3.42 1.2 0.397 0.37 0.34 0.02 1.09 42 210 3.50 1.3 0.431 0.37 0.37 0.06 2.59 43 215 3.58 1.4 0.464 0.37 0.39 0.09 4.09 44 220 3.67 1.4 0.464 0.37 0.39 0.09 4.09 45 225 3.75 1.5 0.497 0.37 0.42 0.12 5.58 46 230 3.83 1.5 0.497 0.37 0.42 0.12 5.58 47 235 3.92 1.6 0.530 0.37 0.45 0.16 7.08 48 240 4.00 1.6 0.530 0.37 0.45 0.16 7.08 49 245 4.08 1.7 0.563 0.37 0.48 0.19 8.58 50 250 4.17 1.8 0.596 0.37 0.51 0.22 10.07 51 255 4.25 1.9 0.629 0.37 0.53 0.26 11.57 52 260 4.33 2.0 0.662 0.37 0.56 0.29 13.07 53 265 4.42 2.1 0.696 0.37 0.59 0.32 14.56 54 270 4.50 2.1 0.696 0.37 0.59 0.32 14.56 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 44.81 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 5.49 UNIT TIME -PERCENT OF LAG 91.1 TOTAL ADJUSTED STORM RAIN -INCHES 2.76 CONSTANT LOSS RATE-in/hr 0.373 LOW LOSS RATE - PERCENT 85% 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 0.729 0.37 0.62 0.36 16.06 56 280 4.67 2.3 0.762 0.37 0.65 0.39 1 17.55 57 285 4.75 2.4 0.795 0.37 0.68 0.42 19.05 58 290 4.83 2.4 0.795 0.37 0.68 0.42 19.05 59 295 4.92 2.5 0.828 0.37 0.70 0.45 20.55 60 300 5.00 2.6 0.861 0.37 0.73 0.49 22.04 61 305 5.08 3.1 1.027 0.37 0.87 0.65 29.53 62 310 5.17 3.6 1.192 0.37 1.01 0.82 37.01 63 315 5.25 3.9 1.292 0.37 1.10 0.92 41.50 64 320 5.33 4.2 1.391 0.37 1.18 1.02 45.99 65 325 5.42 4.7 1.557 0.37 1.32 1.18 53.47 66 330 5.50 5.6 1.855 0.37 1.58 1.48 66.94 67 335 5.58 1.9 0.629 0.37 0.53 0.26 11.57 68 340 5.67 0.9 0.298 0.37 0.25 0.04 2.02 69 345 5.75 0.6 0.199 0.37 0.17 0.03 1.35 70 350 5.83 0.5 0.166 0.37 0.14 0.02 1.12 71 355 5.92 0.3 0.099 0.37 0.08 0.01 0.67 72 360 6.00 0.2 0.066 0.37 0.06 0.01 0.45 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) 2.76 448,954 272,079 1.09 4.06 176,875 66.94 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 44.811 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 5.49 UNIT TIME -PERCENT OF LAG 273.3 TOTAL ADJUSTED STORM RAIN -INCHES 4.41 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.3732 MINIMUM LOSS RATE (for var. loss) - in/hr 0.187 LOW LOSS RATE - DECIMAL 0.85 C 0.00346 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 0.035 0.659 0.030 0.005 0.24 2 30 0.50 0.3 0.053 0.651 0.045 0.008 0.36 3 45 0.75 0.3 0.053 0.644 0.045 0.008 0.36 4 60 1.00 0.4 0.071 0.636 0.060 0.011 0.48 5 75 1.25 0.3 0.053 0.629 0.045 0.008 0.36 6 90 1.50 0.3 0.053 0.621 0.045 0.008 0.36 7 105 1.75 0.3 0.053 0.614 0.045 0.008 0.36 8 120 2.00 0.4 0.071 0.607 0.060 0.011 0.48 9 135 2.25 0.4 0.071 0.599 0.060 0.011 0.48 10 150 2.50 0.4 0.071 0.592 0.060 0.011 0.48 11 165 2.75 0.5 0.088 0.585 0.075 0.013 0.60 12 180 3.00 0.5 0.088 0.577 0.075 0.013 0.60 13 195 3.25 0.5 0.088 0.570 0.075 0.013 0.60 14 210 3.50 0.5 0.088 0.563 0.075 0.013 0.60 15 225 3.75 0.5 0.088 0.556 0.075 0.013 0.60 16 240 4.00 0.6 0.106 0.549 0.090 0.016 0.72 17 255 4.25 0.6 0.106 0.542 0.090 0.016 0.72 18 270 4.50 0.7 0.123 0.535 0.105 0.019 0.84 19 285 4.75 0.7 0.123 0.528 0.105 0.019 0.84 20 300 5.00 0.8 0.141 0.522 0.120 0.021 0.96 21 315 5.25 0.6 0.106 0.515 0.090 0.016 0.72 22 330 5.50 0.7 0.123 0.508 0.105 0.019 0.84 23 345 5.75 0.8 0.141 0.501 0.120 0.021 0.96 24 360 6.00 0.8 0.141 0.495 0.120 0.021 0.96 25 375 6.25 0.9 0.159 0.488 0.135 0.024 1.08 26 390 6.50 0.9 0.159 0.482 0.135 0.024 1.08 27 405 6.75 1.0 0.176 0.475 0.150 0.026 1.20 28 420 7.00 1.0 0.176 0.469 0.150 0.026 1.20 29 435 7.25 1.0 0.176 0.463 0.150 0.026 1.20 30 450 7.50 1.1 0.194 0.456 0.165 0.029 1.32 31 465 7.75 1.2 0.212 0.450 0.180 0.032 1.43 32 480 8.00 1.3 0.229 0.444 0.195 0.034 1.55 33 495 8.25 1.5 0.265 0.438 0.225 0.040 1.79 34 510 8.50 1.5 0.265 0.432 0.225 0.040 1.79 35 525 8.75 1.6 0.282 0.425 0.240 0.042 1.91 36 540 9.00 1.7 0.300 0.419 0.255 0.045 2.03 37 555 9.25 1.9 0.335 0.414 0.285 0.050 2.27 38 570 9.50 2.0 0.353 0.408 0.300 0.053 2.39 39 585 9.75 2.1 0.370 0.402 0.315 0.056 2.51 40 600 10.00 2.2 0.388 0.396 0.330 0.058 2.63 41 615 10.25 1.5 0.265 0.390 0.225 0.040 1.79 42 630 10.50 1.5 0.265 0.385 0.225 0.040 1.79 43 645 10.75 2.0 0.353 0.379 0.300 0.053 2.39 44 660 11.00 2.0 0.353 0.374 0.300 0.053 2.39 45 675 11.25 1.9 0.335 0.368 0.285 0.050 2.27 46 690 11.50 1.9 0.335 0.363 0.285 0.050 2.27 47 705 11.75 1.7 0.300 0.357 0.255 0.045 2.03 48 720 12.00 1.8 0.318 0.352 0.270 0.048 2.15 49 735 12.25 2.5 0.441 0.347 0.375 0.094 4.26 50 750 12.50 2.6 0.459 0.341 0.390 0.117 5.29 51 765 12.75 2.8 0.494 0.336 0.420 0.158 7.12 52 780 13.00 2.9 0.512 0.331 0.435 0.180 8.15 53 795 13.25 3.4 0.600 0.326 0.510 0.273 12.36 54 810 13.50 3.4 0.600 0.321 0.510 0.278 12.58 55 825 13.75 2.3 0.406 0.316 0.345 0.089 4.03 56 840 14.00 2.3 0.406 0.312 0.345 0.094 4.25 57 855 14.25 2.7 0.476 0.307 0.405 0.169 7.65 58 870 14.50 2.6 0.459 0.302 0.390 0.156 7.07 59 885 14.75 2.6 0.459 0.298 0.390 0.161 7.28 60 900 15.00 2.5 0.441 0.293 0.375 0.148 6.69 61 915 15.25 2.4 0.423 0.289 0.360 0.135 6.09 62 930 15.50 2.3 0.406 0.284 0.345 0.122 5.49 63 945 15.75 1.9 0.335 0.280 0.285 0.055 2.50 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 44.811 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 5.49 UNIT TIME -PERCENT OF LAG 273.3 TOTAL ADJUSTED STORM RAIN -INCHES 4.41 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.3732 MINIMUM LOSS RATE (for var. loss) - in/hr 0.187 LOW LOSS RATE - DECIMAL 0.85 C 0.00346 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 0.335 0.276 0.285 0.060 2.70 65 975 16.25 0.4 0.071 0.271 0.060 0.011 0.48 66 990 16.50 0.4 0.071 0.267 0.060 0.011 0.48 67 1005 16.75 0.3 0.053 0.263 0.045 0.008 0.36 68 1020 17.00 0.3 0.053 0.259 0.045 0.008 0.36 69 1035 17.25 0.5 0.088 0.255 0.075 0.013 0.60 70 1050 17.50 0.5 0.088 0.251 0.075 0.013 0.60 71 1065 17.75 0.5 0.088 0.248 0.075 0.013 0.60 72 1080 18.00 0.4 0.071 0.244 0.060 0.011 0.48 73 1095 18.25 0.4 0.071 0.240 0.060 0.011 0.48 74 1110 18.50 0.4 0.071 0.237 0.060 0.011 0.48 75 1125 18.75 0.3 0.053 0.233 0.045 0.008 0.36 76 1140 19.00 0.2 0.035 0.230 0.030 0.005 0.24 77 1155 19.25 0.3 0.053 0.227 0.045 0.008 0.36 78 1170 19.50 0.4 0.071 0.224 0.060 0.011 0.48 79 1185 19.75 0.3 0.053 0.221 0.045 0.008 0.36 80 1200 20.00 0.2 0.035 0.218 0.030 0.005 0.24 81 1215 20.25 0.3 0.053 0.215 0.045 0.008 0.36 82 1230 20.50 0.3 0.053 0.212 0.045 0.008 0.36 83 1245 20.75 0.3 0.053 0.209 0.045 0.008 0.36 84 1260 21.00 0.2 0.035 0.207 0.030 0.005 0.24 85 1275 21.25 0.3 0.053 0.204 0.045 0.008 0.36 86 1290 21.50 0.2 0.035 0.202 0.030 0.005 0.24 87 1305 21.75 0.3 0.053 0.200 0.045 0.008 0.36 88 1320 22.00 0.2 0.035 0.198 0.030 0.005 0.24 89 1335 22.25 0.3 0.053 0.196 0.045 0.008 0.36 90 1350 22.50 0.2 0.035 0.194 0.030 0.005 0.24 91 1365 22.75 0.2 0.035 0.192 0.030 0.005 0.24 92 1380 23.00 0.2 0.035 0.191 0.030 0.005 0.24 93 1395 23.25 0.2 0.035 0.189 0.030 0.005 0.24 94 1410 23.50 0.2 0.035 0.188 0.030 0.005 0.24 95 1425 23.75 0.2 0.035 0.187 0.030 0.005 0.24 96 1440 24.00 0.2 0.035 0.187 0.030 0.005 0.24 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) 4.41 717,351 560,808 0.96 3.59 156,543 12.58 Plate E-2.2 24 Hour Storm Page 9 of 9 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 FUTURE BASIN DA -G 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 4 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT PAVING/HARDSCAPE 0.316 D 56 0.51 1.00 SF - LOW DENSITY 33.880 D 56 0.51 0.30 LANDSCAPING 1.546 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 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 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 2.14 FUTURE BASIN [2] AREA DESIGNATION RAINFALL VOLUME (cuft) DA -G [3] AREA - ACRES 358,093 35.742 [4] L -FEET 48,450 0 [5] L -MILES 447,389 0.000 [6] La -FEET 1.07 0.00 [7] La -MILES FLOOD VOLUME (cu -ft) 0.000 [8] ELEVATION OF HEADWATER 141,025 0 [9] ELEVATION OF CONCENTRATION POINT 3.18 0 [10] H -FEET 2.86 0 [11] S-FEET/MILE 62.43 #DIV/0! [12] SA0.5 #DIV/0! [13] L*LCA/SA0.5 #DIV/0! [14] AVERAGE MANNINGS 'N' 0 [15] LAG TIME -HOURS #DIV/0! [16] LAG TIME -MINUTES #DIV/0! [17] 100% OF LAG -MINUTES #DIV/0! [18] 200% OF LAG -MINUTES #DIV/0! RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 NOAA ATLAS 14 [3] 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 DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR TOTAL RAINFALL (in) 1.44 2.14 2.76 4.41 RAINFALL VOLUME (cuft) 186,831 277,652 358,093 572,171 SOIL LOSSES (cuft) 48,450 139,349 217,068 447,389 EFFECTIVE RAIN (in) 1.07 1.07 1.09 0.96 FLOOD VOLUME (cu -ft) 138,381 138,303 141,025 124,782 (acre -ft) 3.18 3.17 3.24 2.86 PEAK FLOW (cfs) N/A 62.43 53.39 10.03 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) Cr, ICO A O N O (O O O 0.0355 N CO (O d -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 N N O 3 O J J J c a J m C J.- A v a W ore N o« >'a m m `p G IO LL C LOW LOSS RATE PER RCFC/2322 (in/hr) 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 AREA WEIGHTED AVERAGE 0.009 0.948 0.043 co W K Q 0.316 33.880 o V n (ri M SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.37 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] co O, M 0 O0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 RI NUMBER [Plate E-6.1] LL L L (O L LAND USE PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL°MUL°.L SOIL GROUP [Plate C-1] 03 03 CO 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 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.37 LOW LOSS RATE - PERCENT 85% 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 0.62 0.37 0.53 0.25 8.96 2 10 0.17 4.2 0.73 0.37 0.62 0.35 12.70 3 15 0.25 4.4 0.76 0.37 0.65 0.39 13.94 4 20 0.33 4.6 0.79 0.37 0.68 0.42 15.19 5 25 0.42 5.0 0.86 0.37 0.73 0.49 17.68 6 30 0.50 5.6 0.97 0.37 0.82 0.59 21.42 7 35 0.58 6.4 1.11 0.37 0.94 0.73 26.40 8 40 0.67 8.1 1.40 0.37 1.19 1.03 36.99 9 45 0.75 13.1 2.26 0.37 1.92 1.89 68.12 10 50 0.83 34.5 5.96 0.37 5.07 5.59 201.40 11 55 0.92 6.7 1.16 0.37 0.98 0.78 28.27 12 60 1.00 3.8 0.66 0.37 0.56 0.28 10.21 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) 1.44 186,831 48,450 1.07 3.18 138,381 201.40 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 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.14 CONSTANT LOSS RATE-in/hr 0.37 LOW LOSS RATE PERCENT 85% 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 0.33 0.37 0.28 0.05 1.80 2 10 0.17 1.3 0.33 0.37 0.28 0.05 1.80 3 15 0.25 1.1 0.28 0.37 0.24 0.04 1.53 4 20 0.33 1.5 0.39 0.37 0.33 0.01 0.42 5 25 0.42 1.5 0.39 0.37 0.33 0.01 0.42 6 30 0.50 1.8 0.46 0.37 0.39 0.09 3.20 7 35 0.58 1.5 0.39 0.37 0.33 0.01 0.42 8 40 0.67 1.8 0.46 0.37 0.39 0.09 3.20 9 45 0.75 1.8 0.46 0.37 0.39 0.09 3.20 10 50 0.83 1.5 0.39 0.37 0.33 0.01 0.42 11 55 0.92 1.6 0.41 0.37 0.35 0.04 1.35 12 60 1.00 1.8 0.46 0.37 0.39 0.09 3.20 13 65 1.08 2.2 0.56 0.37 0.48 0.19 6.90 14 70 1.17 2.2 0.56 0.37 0.48 0.19 6.90 15 75 1.25 2.2 0.56 0.37 0.48 0.19 6.90 16 80 1.33 2.0 0.51 0.37 0.44 0.14 5.05 17 85 1.42 2.6 0.67 0.37 0.57 0.29 10.60 18 90 1.50 2.7 0.69 0.37 0.59 0.32 11.53 19 95 1.58 2.4 0.62 0.37 0.52 0.24 8.75 20 100 1.67 2.7 0.69 0.37 0.59 0.32 11.53 21 105 1.75 3.3 0.85 0.37 0.72 0.47 17.08 22 110 1.83 3.1 0.80 0.37 0.68 0.42 15.23 23 115 1.92 2.9 0.74 0.37 0.63 0.37 13.38 24 120 2.00 3.0 0.77 0.37 0.65 0.40 14.31 25 125 2.08 3.1 0.80 0.37 0.68 0.42 15.23 26 130 2.17 4.2 1.08 0.37 0.92 0.71 25.41 27 135 2.25 5.0 1.28 0.37 1.09 0.91 32.82 28 140 2.33 3.5 0.90 0.37 0.76 0.53 18.93 29 145 2.42 6.8 1.75 0.37 1.48 1.37 49.48 30 150 2.50 7.3 1.87 0.37 1.59 1.50 54.10 31 155 2.58 8.2 2.11 0.37 1.79 1.73 62.43 32 160 2.67 5.9 1.52 0.37 1.29 1.14 41.15 33 165 2.75 2.0 0.51 0.37 0.44 0.14 5.05 34 170 2.83 1.8 0.46 0.37 0.39 0.09 3.20 35 175 2.92 1.8 0.46 0.37 0.39 0.09 3.20 36 180 3.00 0.6 0.15 0.37 0.13 0.02 0.83 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) 2.14 277,652 139,349 1.07 3.17 138,303 62.43 Plate E-2.2 3 -Hour Storm Page 5 of 9 RCFC & WCD MUDQMdICD@U GLIA °I. IMUS° 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 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.76 CONSTANT LOSS RATE-in/hr 0.373 LOW LOSS RATE - PERCENT 85% 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 0.166 0.37 0.14 0.02 0.90 2 10 0.17 0.6 0.199 0.37 0.17 0.03 1.07 3 15 0.25 0.6 0.199 0.37 0.17 0.03 1.07 4 20 0.33 0.6 0.199 0.37 0.17 0.03 1.07 5 25 0.42 0.6 0.199 0.37 0.17 0.03 1.07 6 30 0.50 0.7 0.232 0.37 0.20 0.03 1.25 7 35 0.58 0.7 0.232 0.37 0.20 0.03 1.25 8 40 0.67 0.7 0.232 0.37 0.20 0.03 1.25 9 45 0.75 0.7 0.232 0.37 0.20 0.03 1.25 10 50 0.83 0.7 0.232 0.37 0.20 0.03 1.25 11 55 0.92 0.7 0.232 0.37 0.20 0.03 1.25 12 60 1.00 0.8 0.265 0.37 0.23 0.04 1.43 13 65 1.08 0.8 0.265 0.37 0.23 0.04 1.43 14 70 1.17 0.8 0.265 0.37 0.23 0.04 1.43 15 75 1.25 0.8 0.265 0.37 0.23 0.04 1.43 16 80 1.33 0.8 0.265 0.37 0.23 0.04 1.43 17 85 1.42 0.8 0.265 0.37 0.23 0.04 1.43 18 90 1.50 0.8 0.265 0.37 0.23 0.04 1.43 19 95 1.58 0.8 0.265 0.37 0.23 0.04 1.43 20 100 1.67 0.8 0.265 0.37 0.23 0.04 1.43 21 105 1.75 0.8 0.265 0.37 0.23 0.04 1.43 22 110 1.83 0.8 0.265 0.37 0.23 0.04 1.43 23 115 1.92 0.8 0.265 0.37 0.23 0.04 1.43 24 120 2.00 0.9 0.298 0.37 0.25 0.04 1.61 25 125 2.08 0.8 0.265 0.37 0.23 0.04 1.43 26 130 2.17 0.9 0.298 0.37 0.25 0.04 1.61 27 135 2.25 0.9 0.298 0.37 0.25 0.04 1.61 28 140 2.33 0.9 0.298 0.37 0.25 0.04 1.61 29 145 2.42 0.9 0.298 0.37 0.25 0.04 1.61 30 150 2.50 0.9 0.298 0.37 0.25 0.04 1.61 31 155 2.58 0.9 0.298 0.37 0.25 0.04 1.61 32 160 2.67 0.9 0.298 0.37 0.25 0.04 1.61 33 165 2.75 1.0 0.331 0.37 0.28 0.05 1.79 34 170 2.83 1.0 0.331 0.37 0.28 0.05 1.79 35 175 2.92 1.0 0.331 0.37 0.28 0.05 1.79 36 180 3.00 1.0 0.331 0.37 0.28 0.05 1.79 37 185 3.08 1.0 0.331 0.37 0.28 0.05 1.79 38 190 3.17 1.1 0.364 0.37 0.31 0.05 1.97 39 195 3.25 1.1 0.364 0.37 0.31 0.05 1.97 40 200 3.33 1.1 0.364 0.37 0.31 0.05 1.97 41 205 3.42 1.2 0.397 0.37 0.34 0.02 0.87 42 210 3.50 1.3 0.431 0.37 0.37 0.06 2.06 43 215 3.58 1.4 0.464 0.37 0.39 0.09 3.25 44 220 3.67 1.4 0.464 0.37 0.39 0.09 3.25 45 225 3.75 1.5 0.497 0.37 0.42 0.12 4.45 46 230 3.83 1.5 0.497 0.37 0.42 0.12 4.45 47 235 3.92 1.6 0.530 0.37 0.45 0.16 5.64 48 240 4.00 1.6 0.530 0.37 0.45 0.16 5.64 49 245 4.08 1.7 0.563 0.37 0.48 0.19 6.83 50 250 4.17 1.8 0.596 0.37 0.51 0.22 8.03 51 255 4.25 1.9 0.629 0.37 0.53 0.26 9.22 52 260 4.33 2.0 0.662 0.37 0.56 0.29 10.41 53 265 4.42 2.1 0.696 0.37 0.59 0.32 11.61 54 270 4.50 2.1 0.696 0.37 0.59 0.32 11.61 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 35.74 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.76 CONSTANT LOSS RATE-in/hr 0.373 LOW LOSS RATE - PERCENT 85% 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 0.729 0.37 0.62 0.36 12.80 56 280 4.67 2.3 0.762 0.37 0.65 0.39 14.00 57 285 4.75 2.4 0.795 0.37 0.68 0.42 15.19 58 290 4.83 2.4 0.795 0.37 0.68 0.42 15.19 59 295 4.92 2.5 0.828 0.37 0.70 0.45 16.38 60 300 5.00 2.6 0.861 0.37 0.73 0.49 17.58 61 305 5.08 3.1 1.027 0.37 0.87 0.65 23.54 62 310 5.17 3.6 1.192 0.37 1.01 0.82 29.51 63 315 5.25 3.9 1.292 0.37 1.10 0.92 33.09 64 320 5.33 4.2 1.391 0.37 1.18 1.02 36.67 65 325 5.42 4.7 1.557 0.37 1.32 1.18 42.64 66 330 5.50 5.6 1.855 0.37 1.58 1.48 53.39 67 335 5.58 1.9 0.629 0.37 0.53 0.26 9.22 68 340 5.67 0.9 0.298 0.37 0.25 0.04 1.61 69 345 5.75 0.6 0.199 0.37 0.17 0.03 1.07 70 350 5.83 0.5 0.166 0.37 0.14 0.02 0.90 71 355 5.92 0.3 0.099 0.37 0.08 0.01 0.54 72 360 6.00 0.2 0.066 0.37 0.06 0.01 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) 2.76 358,093 217,068 1.09 3.24 141,025 53.39 Plate E-2.2 6 -Hour Storm Page 7 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 35.742 UNIT TIME -MINUTES 15 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 4.41 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.3734 MINIMUM LOSS RATE (for var. loss) - in/hr 0.187 LOW LOSS RATE - DECIMAL 0.85 C 0.00346 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 0.035 0.659 0.030 0.005 0.19 2 30 0.50 0.3 0.053 0.652 0.045 0.008 0.29 3 45 0.75 0.3 0.053 0.644 0.045 0.008 0.29 4 60 1.00 0.4 0.071 0.637 0.060 0.011 0.38 5 75 1.25 0.3 0.053 0.629 0.045 0.008 0.29 6 90 1.50 0.3 0.053 0.622 0.045 0.008 0.29 7 105 1.75 0.3 0.053 0.614 0.045 0.008 0.29 8 120 2.00 0.4 0.071 0.607 0.060 0.011 0.38 9 135 2.25 0.4 0.071 0.599 0.060 0.011 0.38 10 150 2.50 0.4 0.071 0.592 0.060 0.011 0.38 11 165 2.75 0.5 0.088 0.585 0.075 0.013 0.48 12 180 3.00 0.5 0.088 0.578 0.075 0.013 0.48 13 195 3.25 0.5 0.088 0.571 0.075 0.013 0.48 14 210 3.50 0.5 0.088 0.564 0.075 0.013 0.48 15 225 3.75 0.5 0.088 0.556 0.075 0.013 0.48 16 240 4.00 0.6 0.106 0.549 0.090 0.016 0.57 17 255 4.25 0.6 0.106 0.542 0.090 0.016 0.57 18 270 4.50 0.7 0.123 0.536 0.105 0.019 0.67 19 285 4.75 0.7 0.123 0.529 0.105 0.019 0.67 20 300 5.00 0.8 0.141 0.522 0.120 0.021 0.76 21 315 5.25 0.6 0.106 0.515 0.090 0.016 0.57 22 330 5.50 0.7 0.123 0.508 0.105 0.019 0.67 23 345 5.75 0.8 0.141 0.502 0.120 0.021 0.76 24 360 6.00 0.8 0.141 0.495 0.120 0.021 0.76 25 375 6.25 0.9 0.159 0.489 0.135 0.024 0.86 26 390 6.50 0.9 0.159 0.482 0.135 0.024 0.86 27 405 6.75 1.0 0.176 0.476 0.150 0.026 0.95 28 420 7.00 1.0 0.176 0.469 0.150 0.026 0.95 29 435 7.25 1.0 0.176 0.463 0.150 0.026 0.95 30 450 7.50 1.1 0.194 0.456 0.165 0.029 1.05 31 465 7.75 1.2 0.212 0.450 0.180 0.032 1.14 32 480 8.00 1.3 0.229 0.444 0.195 0.034 1.24 33 495 8.25 1.5 0.265 0.438 0.225 0.040 1.43 34 510 8.50 1.5 0.265 0.432 0.225 0.040 1.43 35 525 8.75 1.6 0.282 0.426 0.240 0.042 1.53 36 540 9.00 1.7 0.300 0.420 0.255 0.045 1.62 37 555 9.25 1.9 0.335 0.414 0.285 0.050 1.81 38 570 9.50 2.0 0.353 0.408 0.300 0.053 1.91 39 585 9.75 2.1 0.370 0.402 0.315 0.056 2.00 40 600 10.00 2.2 0.388 0.396 0.330 0.058 2.10 41 615 10.25 1.5 0.265 0.391 0.225 0.040 1.43 42 630 10.50 1.5 0.265 0.385 0.225 0.040 1.43 43 645 10.75 2.0 0.353 0.379 0.300 0.053 1.91 44 660 11.00 2.0 0.353 0.374 0.300 0.053 1.91 45 675 11.25 1.9 0.335 0.368 0.285 0.050 1.81 46 690 11.50 1.9 0.335 0.363 0.285 0.050 1.81 47 705 11.75 1.7 0.300 0.357 0.255 0.045 1.62 48 720 12.00 1.8 0.318 0.352 0.270 0.048 1.72 49 735 12.25 2.5 0.441 0.347 0.375 0.094 3.39 50 750 12.50 2.6 0.459 0.342 0.390 0.117 4.22 51 765 12.75 2.8 0.494 0.337 0.420 0.157 5.67 52 780 13.00 2.9 0.512 0.331 0.435 0.180 6.49 53 795 13.25 3.4 0.600 0.326 0.510 0.273 9.85 54 810 13.50 3.4 0.600 0.321 0.510 0.278 10.03 55 825 13.75 2.3 0.406 0.317 0.345 0.089 3.21 56 840 14.00 2.3 0.406 0.312 0.345 0.094 3.39 57 855 14.25 2.7 0.476 0.307 0.405 0.169 6.10 58 870 14.50 2.6 0.459 0.302 0.390 0.156 5.63 59 885 14.75 2.6 0.459 0.298 0.390 0.161 5.80 60 900 15.00 2.5 0.441 0.293 0.375 0.148 5.33 61 915 15.25 2.4 0.423 0.289 0.360 0.135 4.85 62 930 15.50 2.3 0.406 0.284 0.345 0.121 4.38 63 945 15.75 1.9 0.335 0.280 0.285 0.055 1.99 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 35.742 UNIT TIME -MINUTES 15 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 4.41 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.3734 MINIMUM LOSS RATE (for var. loss) - in/hr 0.187 LOW LOSS RATE - DECIMAL 0.85 C 0.00346 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 0.335 0.276 0.285 0.060 2.15 65 975 16.25 0.4 0.071 0.271 0.060 0.011 0.38 66 990 16.50 0.4 0.071 0.267 0.060 0.011 0.38 67 1005 16.75 0.3 0.053 0.263 0.045 0.008 0.29 68 1020 17.00 0.3 0.053 0.259 0.045 0.008 0.29 69 1035 17.25 0.5 0.088 0.255 0.075 0.013 0.48 70 1050 17.50 0.5 0.088 0.252 0.075 0.013 0.48 71 1065 17.75 0.5 0.088 0.248 0.075 0.013 0.48 72 1080 18.00 0.4 0.071 0.244 0.060 0.011 0.38 73 1095 18.25 0.4 0.071 0.241 0.060 0.011 0.38 74 1110 18.50 0.4 0.071 0.237 0.060 0.011 0.38 75 1125 18.75 0.3 0.053 0.234 0.045 0.008 0.29 76 1140 19.00 0.2 0.035 0.230 0.030 0.005 0.19 77 1155 19.25 0.3 0.053 0.227 0.045 0.008 0.29 78 1170 19.50 0.4 0.071 0.224 0.060 0.011 0.38 79 1185 19.75 0.3 0.053 0.221 0.045 0.008 0.29 80 1200 20.00 0.2 0.035 0.218 0.030 0.005 0.19 81 1215 20.25 0.3 0.053 0.215 0.045 0.008 0.29 82 1230 20.50 0.3 0.053 0.212 0.045 0.008 0.29 83 1245 20.75 0.3 0.053 0.209 0.045 0.008 0.29 84 1260 21.00 0.2 0.035 0.207 0.030 0.005 0.19 85 1275 21.25 0.3 0.053 0.204 0.045 0.008 0.29 86 1290 21.50 0.2 0.035 0.202 0.030 0.005 0.19 87 1305 21.75 0.3 0.053 0.200 0.045 0.008 0.29 88 1320 22.00 0.2 0.035 0.198 0.030 0.005 0.19 89 1335 22.25 0.3 0.053 0.196 0.045 0.008 0.29 90 1350 22.50 0.2 0.035 0.194 0.030 0.005 0.19 91 1365 22.75 0.2 0.035 0.192 0.030 0.005 0.19 92 1380 23.00 0.2 0.035 0.191 0.030 0.005 0.19 93 1395 23.25 0.2 0.035 0.190 0.030 0.005 0.19 94 1410 23.50 0.2 0.035 0.188 0.030 0.005 0.19 95 1425 23.75 0.2 0.035 0.187 0.030 0.005 0.19 96 1440 24.00 0.2 0.035 0.187 0.030 0.005 0.19 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) 4.41 572,171 447,389 0.96 2.86 124,782 10.03 Plate E-2.2 24 Hour Storm Page 9 of 9 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 FUTURE BASIN DA -H 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 1 B 2 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT COMMERCIAL 7.118 D 56 0.51 0.90 PAVING/HARDSCAPE 0.000 D 56 0.51 1.00 LANDSCAPING 0.000 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 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 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 2.14 FUTURE BASIN [2] AREA DESIGNATION RAINFALL VOLUME (cuft) DA -H [3] AREA - ACRES 71,314 7.118 [4] L -FEET 2,504 0 [5] L -MILES 46,429 0.000 [6] La -FEET 1.85 0.00 [7] La -MILES FLOOD VOLUME (cu -ft) 0.000 [8] ELEVATION OF HEADWATER 56,379 0 [9] ELEVATION OF CONCENTRATION POINT 0.80 0 [10] H -FEET 1.55 0 [11] S-FEET/MILE 14.42 #DIV/0! [12] SA0.5 #DIV/0! [13] L*LCA/SA0.5 #DIV/0! [14] AVERAGE MANNINGS 'N' 0 [15] LAG TIME -HOURS #DIV/0! [16] LAG TIME -MINUTES #DIV/0! [17] 100% OF LAG -MINUTES #DIV/0! [18] 200% OF LAG -MINUTES #DIV/0! RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 NOAA ATLAS 14 [3] 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 DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR TOTAL RAINFALL (in) 1.44 2.14 2.76 4.41 RAINFALL VOLUME (cuft) 37,207 55,294 71,314 113,948 SOIL LOSSES (cuft) 2,504 7,511 14,935 46,429 EFFECTIVE RAIN (in) 1.34 1.85 2.18 2.61 FLOOD VOLUME (cu -ft) 34,704 47,783 56,379 67,518 (acre -ft) 0.80 1.10 1.29 1.55 PEAK FLOW (cfs) N/A 14.42 12.62 3.71 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) 0.1800 0.0000 0.0000 0 � 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% n L N O 3 0 J J iiJ E a . J o E d m °327. v m o'm aH o Z c o y > ) m m `o 0 0 m LL o LOW LOSS RATE PER RCFC/2322 (in/hr) 00 0 0 0o 0 0 0 0.8200 LOW LOSS CONDITION DEVELOPED _ DEVELOPED DEVELOPED MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0969 0.0000 0.0000 00 O AREA WEIGHTED AVERAGE 00 00 o 0.000 Q W K Q co o - 0 ,- o h O 0.000 7.118 SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC 11 ADJUSTED INFILTRATION RATE (in/hr) O Ln O O O 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] .) o 0 o O PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 RI NUMBER [Plate E-6.1] OO U U O UD LAND USE COMMERCIAL PAVING/HARDSCAPE LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL°MUL°.L SOIL GROUP [Plate C-1] 0 0 0 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 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.10 LOW LOSS RATE - PERCENT 85% 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 0.62 0.10 0.53 0.53 3.77 2 10 0.17 4.2 0.73 0.10 0.62 0.63 4.51 3 15 0.25 4.4 0.76 0.10 0.65 0.66 4.76 4 20 0.33 4.6 0.79 0.10 0.68 0.70 5.01 5 25 0.42 5.0 0.86 0.10 0.73 0.77 5.51 6 30 0.50 5.6 0.97 0.10 0.82 0.87 6.25 7 35 0.58 6.4 1.11 0.10 0.94 1.01 7.24 8 40 0.67 8.1 1.40 0.10 1.19 1.30 9.35 9 45 0.75 13.1 2.26 0.10 1.92 2.17 15.55 10 50 0.83 34.5 5.96 0.10 5.07 5.86 42.09 11 55 0.92 6.7 1.16 0.10 0.98 1.06 7.61 12 60 1.00 3.8 0.66 0.10 0.56 0.56 4.02 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) 1.44 37,207 2,504 1.34 0.80 34,704 42.09 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 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.14 CONSTANT LOSS RATE-in/hr 0.10 LOW LOSS RATE PERCENT 85% 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 0.33 0.10 0.28 0.24 1.70 2 10 0.17 1.3 0.33 0.10 0.28 0.24 1.70 3 15 0.25 1.1 0.28 0.10 0.24 0.19 1.33 4 20 0.33 1.5 0.39 0.10 0.33 0.29 2.07 5 25 0.42 1.5 0.39 0.10 0.33 0.29 2.07 6 30 0.50 1.8 0.46 0.10 0.39 0.37 2.62 7 35 0.58 1.5 0.39 0.10 0.33 0.29 2.07 8 40 0.67 1.8 0.46 0.10 0.39 0.37 2.62 9 45 0.75 1.8 0.46 0.10 0.39 0.37 2.62 10 50 0.83 1.5 0.39 0.10 0.33 0.29 2.07 11 55 0.92 1.6 0.41 0.10 0.35 0.31 2.25 12 60 1.00 1.8 0.46 0.10 0.39 0.37 2.62 13 65 1.08 2.2 0.56 0.10 0.48 0.47 3.36 14 70 1.17 2.2 0.56 0.10 0.48 0.47 3.36 15 75 1.25 2.2 0.56 0.10 0.48 0.47 3.36 16 80 1.33 2.0 0.51 0.10 0.44 0.42 2.99 17 85 1.42 2.6 0.67 0.10 0.57 0.57 4.10 18 90 1.50 2.7 0.69 0.10 0.59 0.60 4.28 19 95 1.58 2.4 0.62 0.10 0.52 0.52 3.73 20 100 1.67 2.7 0.69 0.10 0.59 0.60 4.28 21 105 1.75 3.3 0.85 0.10 0.72 0.75 5.39 22 110 1.83 3.1 0.80 0.10 0.68 0.70 5.02 23 115 1.92 2.9 0.74 0.10 0.63 0.65 4.65 24 120 2.00 3.0 0.77 0.10 0.65 0.67 4.83 25 125 2.08 3.1 0.80 0.10 0.68 0.70 5.02 26 130 2.17 4.2 1.08 0.10 0.92 0.98 7.05 27 135 2.25 5.0 1.28 0.10 1.09 1.19 8.52 28 140 2.33 3.5 0.90 0.10 0.76 0.80 5.76 29 145 2.42 6.8 1.75 0.10 1.48 1.65 11.84 30 150 2.50 7.3 1.87 0.10 1.59 1.78 12.76 31 155 2.58 8.2 2.11 0.10 1.79 2.01 14.42 32 160 2.67 5.9 1.52 0.10 1.29 1.42 10.18 33 165 2.75 2.0 0.51 0.10 0.44 0.42 2.99 34 170 2.83 1.8 0.46 0.10 0.39 0.37 2.62 35 175 2.92 1.8 0.46 0.10 0.39 0.37 2.62 36 180 3.00 0.6 0.15 0.10 0.13 0.06 0.41 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) 2.14 55,294 7,511 1.85 1.10 47,783 14.42 Plate E-2.2 3 -Hour Storm Page 5 of 9 RCFC & WCD MUDQMdICD@U GLIA °I. IMUS° 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 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.76 CONSTANT LOSS RATE-in/hr 0.097 LOW LOSS RATE - PERCENT 85% 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 0.166 0.10 0.14 0.07 0.49 2 10 0.17 0.6 0.199 0.10 0.17 0.10 0.73 3 15 0.25 0.6 0.199 0.10 0.17 0.10 0.73 4 20 0.33 0.6 0.199 0.10 0.17 0.10 0.73 5 25 0.42 0.6 0.199 0.10 0.17 0.10 0.73 6 30 0.50 0.7 0.232 0.10 0.20 0.13 0.97 7 35 0.58 0.7 0.232 0.10 0.20 0.13 0.97 8 40 0.67 0.7 0.232 0.10 0.20 0.13 0.97 9 45 0.75 0.7 0.232 0.10 0.20 0.13 0.97 10 50 0.83 0.7 0.232 0.10 0.20 0.13 0.97 11 55 0.92 0.7 0.232 0.10 0.20 0.13 0.97 12 60 1.00 0.8 0.265 0.10 0.23 0.17 1.21 13 65 1.08 0.8 0.265 0.10 0.23 0.17 1.21 14 70 1.17 0.8 0.265 0.10 0.23 0.17 1.21 15 75 1.25 0.8 0.265 0.10 0.23 0.17 1.21 16 80 1.33 0.8 0.265 0.10 0.23 0.17 1.21 17 85 1.42 0.8 0.265 0.10 0.23 0.17 1.21 18 90 1.50 0.8 0.265 0.10 0.23 0.17 1.21 19 95 1.58 0.8 0.265 0.10 0.23 0.17 1.21 20 100 1.67 0.8 0.265 0.10 0.23 0.17 1.21 21 105 1.75 0.8 0.265 0.10 0.23 0.17 1.21 22 110 1.83 0.8 0.265 0.10 0.23 0.17 1.21 23 115 1.92 0.8 0.265 0.10 0.23 0.17 1.21 24 120 2.00 0.9 0.298 0.10 0.25 0.20 1.44 25 125 2.08 0.8 0.265 0.10 0.23 0.17 1.21 26 130 2.17 0.9 0.298 0.10 0.25 0.20 1.44 27 135 2.25 0.9 0.298 0.10 0.25 0.20 1.44 28 140 2.33 0.9 0.298 0.10 0.25 0.20 1.44 29 145 2.42 0.9 0.298 0.10 0.25 0.20 1.44 30 150 2.50 0.9 0.298 0.10 0.25 0.20 1.44 31 155 2.58 0.9 0.298 0.10 0.25 0.20 1.44 32 160 2.67 0.9 0.298 0.10 0.25 0.20 1.44 33 165 2.75 1.0 0.331 0.10 0.28 0.23 1.68 34 170 2.83 1.0 0.331 0.10 0.28 0.23 1.68 35 175 2.92 1.0 0.331 0.10 0.28 0.23 1.68 36 180 3.00 1.0 0.331 0.10 0.28 0.23 1.68 37 185 3.08 1.0 0.331 0.10 0.28 0.23 1.68 38 190 3.17 1.1 0.364 0.10 0.31 0.27 1.92 39 195 3.25 1.1 0.364 0.10 0.31 0.27 1.92 40 200 3.33 1.1 0.364 0.10 0.31 0.27 1.92 41 205 3.42 1.2 0.397 0.10 0.34 0.30 2.16 42 210 3.50 1.3 0.431 0.10 0.37 0.33 2.39 43 215 3.58 1.4 0.464 0.10 0.39 0.37 2.63 44 220 3.67 1.4 0.464 0.10 0.39 0.37 2.63 45 225 3.75 1.5 0.497 0.10 0.42 0.40 2.87 46 230 3.83 1.5 0.497 0.10 0.42 0.40 2.87 47 235 3.92 1.6 0.530 0.10 0.45 0.43 3.11 48 240 4.00 1.6 0.530 0.10 0.45 0.43 3.11 49 245 4.08 1.7 0.563 0.10 0.48 0.47 3.35 50 250 4.17 1.8 0.596 0.10 0.51 0.50 3.58 51 255 4.25 1.9 0.629 0.10 0.53 0.53 3.82 52 260 4.33 2.0 0.662 0.10 0.56 0.57 4.06 53 265 4.42 2.1 0.696 0.10 0.59 0.60 4.30 54 270 4.50 2.1 0.696 0.10 0.59 0.60 4.30 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 7.12 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.76 CONSTANT LOSS RATE-in/hr 0.097 LOW LOSS RATE - PERCENT 85% 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 0.729 0.10 0.62 0.63 4.53 56 280 4.67 2.3 0.762 0.10 0.65 0.66 4.77 57 285 4.75 2.4 0.795 0.10 0.68 0.70 5.01 58 290 4.83 2.4 0.795 0.10 0.68 0.70 5.01 59 295 4.92 2.5 0.828 0.10 0.70 0.73 5.25 60 300 5.00 2.6 0.861 0.10 0.73 0.76 5.49 61 305 5.08 3.1 1.027 0.10 0.87 0.93 6.67 62 310 5.17 3.6 1.192 0.10 1.01 1.10 7.86 63 315 5.25 3.9 1.292 0.10 1.10 1.19 8.58 64 320 5.33 4.2 1.391 0.10 1.18 1.29 9.29 65 325 5.42 4.7 1.557 0.10 1.32 1.46 10.48 66 330 5.50 5.6 1.855 0.10 1.58 1.76 12.62 67 335 5.58 1.9 0.629 0.10 0.53 0.53 3.82 68 340 5.67 0.9 0.298 0.10 0.25 0.20 1.44 69 345 5.75 0.6 0.199 0.10 0.17 0.10 0.73 70 350 5.83 0.5 0.166 0.10 0.14 0.07 0.49 71 355 5.92 0.3 0.099 0.10 0.08 0.00 0.02 72 360 6.00 0.2 0.066 0.10 0.06 0.01 0.07 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) 2.76 71,314 14,935 2.18 1.29 56,379 12.62 Plate E-2.2 6 -Hour Storm Page 7 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 7.118 UNIT TIME -MINUTES 15 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 4.41 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.0969 MINIMUM LOSS RATE (for var. loss) - in/hr 0.048 LOW LOSS RATE - DECIMAL 0.85 C 0.00090 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 0.035 0.171 0.030 0.005 0.04 2 30 0.50 0.3 0.053 0.169 0.045 0.008 0.06 3 45 0.75 0.3 0.053 0.167 0.045 0.008 0.06 4 60 1.00 0.4 0.071 0.165 0.060 0.011 0.08 5 75 1.25 0.3 0.053 0.163 0.045 0.008 0.06 6 90 1.50 0.3 0.053 0.161 0.045 0.008 0.06 7 105 1.75 0.3 0.053 0.159 0.045 0.008 0.06 8 120 2.00 0.4 0.071 0.157 0.060 0.011 0.08 9 135 2.25 0.4 0.071 0.156 0.060 0.011 0.08 10 150 2.50 0.4 0.071 0.154 0.060 0.011 0.08 11 165 2.75 0.5 0.088 0.152 0.075 0.013 0.09 12 180 3.00 0.5 0.088 0.150 0.075 0.013 0.09 13 195 3.25 0.5 0.088 0.148 0.075 0.013 0.09 14 210 3.50 0.5 0.088 0.146 0.075 0.013 0.09 15 225 3.75 0.5 0.088 0.144 0.075 0.013 0.09 16 240 4.00 0.6 0.106 0.143 0.090 0.016 0.11 17 255 4.25 0.6 0.106 0.141 0.090 0.016 0.11 18 270 4.50 0.7 0.123 0.139 0.105 0.019 0.13 19 285 4.75 0.7 0.123 0.137 0.105 0.019 0.13 20 300 5.00 0.8 0.141 0.135 0.120 0.006 0.04 21 315 5.25 0.6 0.106 0.134 0.090 0.016 0.11 22 330 5.50 0.7 0.123 0.132 0.105 0.019 0.13 23 345 5.75 0.8 0.141 0.130 0.120 0.011 0.08 24 360 6.00 0.8 0.141 0.128 0.120 0.013 0.09 25 375 6.25 0.9 0.159 0.127 0.135 0.032 0.23 26 390 6.50 0.9 0.159 0.125 0.135 0.034 0.24 27 405 6.75 1.0 0.176 0.123 0.150 0.053 0.38 28 420 7.00 1.0 0.176 0.122 0.150 0.055 0.39 29 435 7.25 1.0 0.176 0.120 0.150 0.056 0.40 30 450 7.50 1.1 0.194 0.118 0.165 0.076 0.54 31 465 7.75 1.2 0.212 0.117 0.180 0.095 0.68 32 480 8.00 1.3 0.229 0.115 0.195 0.114 0.82 33 495 8.25 1.5 0.265 0.114 0.225 0.151 1.08 34 510 8.50 1.5 0.265 0.112 0.225 0.153 1.10 35 525 8.75 1.6 0.282 0.110 0.240 0.172 1.23 36 540 9.00 1.7 0.300 0.109 0.255 0.191 1.37 37 555 9.25 1.9 0.335 0.107 0.285 0.228 1.63 38 570 9.50 2.0 0.353 0.106 0.300 0.247 1.77 39 585 9.75 2.1 0.370 0.104 0.315 0.266 1.91 40 600 10.00 2.2 0.388 0.103 0.330 0.285 2.05 41 615 10.25 1.5 0.265 0.101 0.225 0.163 1.17 42 630 10.50 1.5 0.265 0.100 0.225 0.165 1.18 43 645 10.75 2.0 0.353 0.098 0.300 0.254 1.83 44 660 11.00 2.0 0.353 0.097 0.300 0.256 1.84 45 675 11.25 1.9 0.335 0.096 0.285 0.240 1.72 46 690 11.50 1.9 0.335 0.094 0.285 0.241 1.73 47 705 11.75 1.7 0.300 0.093 0.255 0.207 1.49 48 720 12.00 1.8 0.318 0.091 0.270 0.226 1.62 49 735 12.25 2.5 0.441 0.090 0.375 0.351 2.52 50 750 12.50 2.6 0.459 0.089 0.390 0.370 2.66 51 765 12.75 2.8 0.494 0.087 0.420 0.407 2.92 52 780 13.00 2.9 0.512 0.086 0.435 0.426 3.05 53 795 13.25 3.4 0.600 0.085 0.510 0.515 3.70 54 810 13.50 3.4 0.600 0.083 0.510 0.516 3.71 55 825 13.75 2.3 0.406 0.082 0.345 0.324 2.32 56 840 14.00 2.3 0.406 0.081 0.345 0.325 2.33 57 855 14.25 2.7 0.476 0.080 0.405 0.397 2.85 58 870 14.50 2.6 0.459 0.078 0.390 0.380 2.73 59 885 14.75 2.6 0.459 0.077 0.390 0.381 2.74 60 900 15.00 2.5 0.441 0.076 0.375 0.365 2.62 61 915 15.25 2.4 0.423 0.075 0.360 0.348 2.50 62 930 15.50 2.3 0.406 0.074 0.345 0.332 2.38 63 945 15.75 1.9 0.335 0.073 0.285 0.263 1.88 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 7.118 UNIT TIME -MINUTES 15 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 4.41 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.0969 MINIMUM LOSS RATE (for var. loss) - in/hr 0.048 LOW LOSS RATE - DECIMAL 0.85 C 0.00090 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 0.335 0.072 0.285 0.264 1.89 65 975 16.25 0.4 0.071 0.070 0.060 0.000 0.00 66 990 16.50 0.4 0.071 0.069 0.060 0.001 0.01 67 1005 16.75 0.3 0.053 0.068 0.045 0.008 0.06 68 1020 17.00 0.3 0.053 0.067 0.045 0.008 0.06 69 1035 17.25 0.5 0.088 0.066 0.075 0.022 0.16 70 1050 17.50 0.5 0.088 0.065 0.075 0.023 0.16 71 1065 17.75 0.5 0.088 0.064 0.075 0.024 0.17 72 1080 18.00 0.4 0.071 0.063 0.060 0.007 0.05 73 1095 18.25 0.4 0.071 0.062 0.060 0.008 0.06 74 1110 18.50 0.4 0.071 0.061 0.060 0.009 0.07 75 1125 18.75 0.3 0.053 0.061 0.045 0.008 0.06 76 1140 19.00 0.2 0.035 0.060 0.030 0.005 0.04 77 1155 19.25 0.3 0.053 0.059 0.045 0.008 0.06 78 1170 19.50 0.4 0.071 0.058 0.060 0.012 0.09 79 1185 19.75 0.3 0.053 0.057 0.045 0.008 0.06 80 1200 20.00 0.2 0.035 0.057 0.030 0.005 0.04 81 1215 20.25 0.3 0.053 0.056 0.045 0.008 0.06 82 1230 20.50 0.3 0.053 0.055 0.045 0.008 0.06 83 1245 20.75 0.3 0.053 0.054 0.045 0.008 0.06 84 1260 21.00 0.2 0.035 0.054 0.030 0.005 0.04 85 1275 21.25 0.3 0.053 0.053 0.045 0.008 0.06 86 1290 21.50 0.2 0.035 0.052 0.030 0.005 0.04 87 1305 21.75 0.3 0.053 0.052 0.045 0.001 0.01 88 1320 22.00 0.2 0.035 0.051 0.030 0.005 0.04 89 1335 22.25 0.3 0.053 0.051 0.045 0.002 0.02 90 1350 22.50 0.2 0.035 0.050 0.030 0.005 0.04 91 1365 22.75 0.2 0.035 0.050 0.030 0.005 0.04 92 1380 23.00 0.2 0.035 0.050 0.030 0.005 0.04 93 1395 23.25 0.2 0.035 0.049 0.030 0.005 0.04 94 1410 23.50 0.2 0.035 0.049 0.030 0.005 0.04 95 1425 23.75 0.2 0.035 0.049 0.030 0.005 0.04 96 1440 24.00 0.2 0.035 0.048 0.030 0.005 0.04 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) 4.41 113,948 46,429 2.61 1.55 67,518 3.71 Plate E-2.2 24 Hour Storm Page 9 of 9 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 FUTURE BASIN DA -I 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 4 B 9 B AMC II ACRES LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT PAVING/HARDSCAPE 0.470 D 56 0.51 1.00 SF - LOW DENSITY 47.890 D 56 0.51 0.30 LANDSCAPING 3.269 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 100 85% 14 1.44 in 2.14 in 2.76 in 4.41 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 2.14 FUTURE BASIN [2] AREA DESIGNATION RAINFALL VOLUME (cuft) DA -I [3] AREA - ACRES 517,263 51.629 [4] L -FEET 70,315 0 [5] L -MILES 647,343 0.000 [6] La -FEET 1.06 0.00 [7] La -MILES FLOOD VOLUME (cu -ft) 0.000 [8] ELEVATION OF HEADWATER 202,969 0 [9] ELEVATION OF CONCENTRATION POINT 4.58 0 [10] H -FEET 4.11 0 [11] S-FEET/MILE 90.09 #DIV/0! [12] SA0.5 #DIV/0! [13] L*LCA/SA0.5 #DIV/0! [14] AVERAGE MANNINGS 'N' 0 [15] LAG TIME -HOURS #DIV/0! [16] LAG TIME -MINUTES #DIV/0! [17] 100% OF LAG -MINUTES #DIV/0! [18] 200% OF LAG -MINUTES #DIV/0! RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 NOAA ATLAS 14 [3] 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 DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR TOTAL RAINFALL (in) 1.44 2.14 2.76 4.41 RAINFALL VOLUME (cuft) 269,876 401,066 517,263 826,496 SOIL LOSSES (cuft) 70,315 202,167 314,294 647,343 EFFECTIVE RAIN (in) 1.06 1.06 1.08 0.96 FLOOD VOLUME (cu -ft) 199,561 198,899 202,969 179,153 (acre -ft) 4.58 4.57 4.66 4.11 PEAK FLOW (cfs) N/A 90.09 77.02 14.41 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) O N m O ,- 0 CO d d LO O d 0 CO CO d -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 . o N J O 0M J IJ c a. « o E d m °Jy v m 'O dd N .+ 'EO atlo K0 ei > ' m m p0 G m LL 0 LOW LOSS RATE PER RCFC/2322 (in/hr) 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 N O AREA WEIGHTED AVERAGE co O o) o 0.063 to Q W K Q 0.470 47.890 3.269 rn N N SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II ADJUSTED INFILTRATION RATE (in/hr) 0.05 0.37 0.46 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.3] co O8 M 0 O0 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 0.51 RI NUMBER [Plate E-6.1] coco co LAND USE PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL°MUL°.L SOIL GROUP [Plate C-1] CO 03 CO 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 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 1.44 CONSTANT LOSS RATE-in/hr 0.38 LOW LOSS RATE - PERCENT 85% 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 0.62 0.38 0.53 0.25 12.85 2 10 0.17 4.2 0.73 0.38 0.62 0.35 18.25 3 15 0.25 4.4 0.76 0.38 0.65 0.39 20.05 4 20 0.33 4.6 0.79 0.38 0.68 0.42 21.85 5 25 0.42 5.0 0.86 0.38 0.73 0.49 25.45 6 30 0.50 5.6 0.97 0.38 0.82 0.59 30.84 7 35 0.58 6.4 1.11 0.38 0.94 0.73 38.04 8 40 0.67 8.1 1.40 0.38 1.19 1.02 53.33 9 45 0.75 13.1 2.26 0.38 1.92 1.89 98.31 10 50 0.83 34.5 5.96 0.38 5.07 5.59 290.83 11 55 0.92 6.7 1.16 0.38 0.98 0.78 40.74 12 60 1.00 3.8 0.66 0.38 0.56 0.28 14.65 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) 1.44 269,876 70,315 1.06 4.58 199,561 290.83 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 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.14 CONSTANT LOSS RATE-in/hr 0.38 LOW LOSS RATE PERCENT 85% 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 0.33 0.38 0.28 0.05 2.61 2 10 0.17 1.3 0.33 0.38 0.28 0.05 2.61 3 15 0.25 1.1 0.28 0.38 0.24 0.04 2.21 4 20 0.33 1.5 0.39 0.38 0.33 0.01 0.52 5 25 0.42 1.5 0.39 0.38 0.33 0.01 0.52 6 30 0.50 1.8 0.46 0.38 0.39 0.09 4.53 7 35 0.58 1.5 0.39 0.38 0.33 0.01 0.52 8 40 0.67 1.8 0.46 0.38 0.39 0.09 4.53 9 45 0.75 1.8 0.46 0.38 0.39 0.09 4.53 10 50 0.83 1.5 0.39 0.38 0.33 0.01 0.52 11 55 0.92 1.6 0.41 0.38 0.35 0.04 1.86 12 60 1.00 1.8 0.46 0.38 0.39 0.09 4.53 13 65 1.08 2.2 0.56 0.38 0.48 0.19 9.88 14 70 1.17 2.2 0.56 0.38 0.48 0.19 9.88 15 75 1.25 2.2 0.56 0.38 0.48 0.19 9.88 16 80 1.33 2.0 0.51 0.38 0.44 0.14 7.21 17 85 1.42 2.6 0.67 0.38 0.57 0.29 15.23 18 90 1.50 2.7 0.69 0.38 0.59 0.32 16.56 19 95 1.58 2.4 0.62 0.38 0.52 0.24 12.55 20 100 1.67 2.7 0.69 0.38 0.59 0.32 16.56 21 105 1.75 3.3 0.85 0.38 0.72 0.47 24.59 22 110 1.83 3.1 0.80 0.38 0.68 0.42 21.91 23 115 1.92 2.9 0.74 0.38 0.63 0.37 19.24 24 120 2.00 3.0 0.77 0.38 0.65 0.40 20.57 25 125 2.08 3.1 0.80 0.38 0.68 0.42 21.91 26 130 2.17 4.2 1.08 0.38 0.92 0.70 36.62 27 135 2.25 5.0 1.28 0.38 1.09 0.91 47.31 28 140 2.33 3.5 0.90 0.38 0.76 0.52 27.26 29 145 2.42 6.8 1.75 0.38 1.48 1.37 71.38 30 150 2.50 7.3 1.87 0.38 1.59 1.50 78.06 31 155 2.58 8.2 2.11 0.38 1.79 1.73 90.09 32 160 2.67 5.9 1.52 0.38 1.29 1.14 59.34 33 165 2.75 2.0 0.51 0.38 0.44 0.14 7.21 34 170 2.83 1.8 0.46 0.38 0.39 0.09 4.53 35 175 2.92 1.8 0.46 0.38 0.39 0.09 4.53 36 180 3.00 0.6 0.15 0.38 0.13 0.02 1.20 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) 2.14 401,066 202,167 1.06 4.57 198,899 90.09 Plate E-2.2 3 -Hour Storm Page 5 of 9 RCFC & WCD MUDQMdICD@U GLIA °I. IMUS° 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 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.76 CONSTANT LOSS RATE-in/hr 0.375 LOW LOSS RATE - PERCENT 85% 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 0.166 0.38 0.14 0.02 1.29 2 10 0.17 0.6 0.199 0.38 0.17 0.03 1.55 3 15 0.25 0.6 0.199 0.38 0.17 0.03 1.55 4 20 0.33 0.6 0.199 0.38 0.17 0.03 1.55 5 25 0.42 0.6 0.199 0.38 0.17 0.03 1.55 6 30 0.50 0.7 0.232 0.38 0.20 0.03 1.81 7 35 0.58 0.7 0.232 0.38 0.20 0.03 1.81 8 40 0.67 0.7 0.232 0.38 0.20 0.03 1.81 9 45 0.75 0.7 0.232 0.38 0.20 0.03 1.81 10 50 0.83 0.7 0.232 0.38 0.20 0.03 1.81 11 55 0.92 0.7 0.232 0.38 0.20 0.03 1.81 12 60 1.00 0.8 0.265 0.38 0.23 0.04 2.07 13 65 1.08 0.8 0.265 0.38 0.23 0.04 2.07 14 70 1.17 0.8 0.265 0.38 0.23 0.04 2.07 15 75 1.25 0.8 0.265 0.38 0.23 0.04 2.07 16 80 1.33 0.8 0.265 0.38 0.23 0.04 2.07 17 85 1.42 0.8 0.265 0.38 0.23 0.04 2.07 18 90 1.50 0.8 0.265 0.38 0.23 0.04 2.07 19 95 1.58 0.8 0.265 0.38 0.23 0.04 2.07 20 100 1.67 0.8 0.265 0.38 0.23 0.04 2.07 21 105 1.75 0.8 0.265 0.38 0.23 0.04 2.07 22 110 1.83 0.8 0.265 0.38 0.23 0.04 2.07 23 115 1.92 0.8 0.265 0.38 0.23 0.04 2.07 24 120 2.00 0.9 0.298 0.38 0.25 0.04 2.33 25 125 2.08 0.8 0.265 0.38 0.23 0.04 2.07 26 130 2.17 0.9 0.298 0.38 0.25 0.04 2.33 27 135 2.25 0.9 0.298 0.38 0.25 0.04 2.33 28 140 2.33 0.9 0.298 0.38 0.25 0.04 2.33 29 145 2.42 0.9 0.298 0.38 0.25 0.04 2.33 30 150 2.50 0.9 0.298 0.38 0.25 0.04 2.33 31 155 2.58 0.9 0.298 0.38 0.25 0.04 2.33 32 160 2.67 0.9 0.298 0.38 0.25 0.04 2.33 33 165 2.75 1.0 0.331 0.38 0.28 0.05 2.59 34 170 2.83 1.0 0.331 0.38 0.28 0.05 2.59 35 175 2.92 1.0 0.331 0.38 0.28 0.05 2.59 36 180 3.00 1.0 0.331 0.38 0.28 0.05 2.59 37 185 3.08 1.0 0.331 0.38 0.28 0.05 2.59 38 190 3.17 1.1 0.364 0.38 0.31 0.05 2.84 39 195 3.25 1.1 0.364 0.38 0.31 0.05 2.84 40 200 3.33 1.1 0.364 0.38 0.31 0.05 2.84 41 205 3.42 1.2 0.397 0.38 0.34 0.02 1.16 42 210 3.50 1.3 0.431 0.38 0.37 0.06 2.88 43 215 3.58 1.4 0.464 0.38 0.39 0.09 4.61 44 220 3.67 1.4 0.464 0.38 0.39 0.09 4.61 45 225 3.75 1.5 0.497 0.38 0.42 0.12 6.33 46 230 3.83 1.5 0.497 0.38 0.42 0.12 6.33 47 235 3.92 1.6 0.530 0.38 0.45 0.15 8.06 48 240 4.00 1.6 0.530 0.38 0.45 0.15 8.06 49 245 4.08 1.7 0.563 0.38 0.48 0.19 9.78 50 250 4.17 1.8 0.596 0.38 0.51 0.22 11.50 51 255 4.25 1.9 0.629 0.38 0.53 0.25 13.23 52 260 4.33 2.0 0.662 0.38 0.56 0.29 14.95 53 265 4.42 2.1 0.696 0.38 0.59 0.32 16.68 54 270 4.50 2.1 0.696 0.38 0.59 0.32 16.68 Plate E-2.2 6 -Hour Storm Page 6 of 9 RCFC & WCD MUDQEDdICD@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 51.63 UNIT TIME -MINUTES 5 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 2.76 CONSTANT LOSS RATE-in/hr 0.375 LOW LOSS RATE - PERCENT 85% 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 0.729 0.38 0.62 0.35 18.40 56 280 4.67 2.3 0.762 0.38 0.65 0.39 20.12 57 285 4.75 2.4 0.795 0.38 0.68 0.42 21.85 58 290 4.83 2.4 0.795 0.38 0.68 0.42 21.85 59 295 4.92 2.5 0.828 0.38 0.70 0.45 23.57 60 300 5.00 2.6 0.861 0.38 0.73 0.49 25.30 61 305 5.08 3.1 1.027 0.38 0.87 0.65 33.92 62 310 5.17 3.6 1.192 0.38 1.01 0.82 42.54 63 315 5.25 3.9 1.292 0.38 1.10 0.92 47.71 64 320 5.33 4.2 1.391 0.38 1.18 1.02 52.88 65 325 5.42 4.7 1.557 0.38 1.32 1.18 61.51 66 330 5.50 5.6 1.855 0.38 1.58 1.48 77.02 67 335 5.58 1.9 0.629 0.38 0.53 0.25 13.23 68 340 5.67 0.9 0.298 0.38 0.25 0.04 2.33 69 345 5.75 0.6 0.199 0.38 0.17 0.03 1.55 70 350 5.83 0.5 0.166 0.38 0.14 0.02 1.29 71 355 5.92 0.3 0.099 0.38 0.08 0.01 0.78 72 360 6.00 0.2 0.066 0.38 0.06 0.01 0.52 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) 2.76 517,263 314,294 1.08 4.66 202,969 77.02 Plate E-2.2 6 -Hour Storm Page 7 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 51.629 UNIT TIME -MINUTES 15 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 4.41 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.3752 MINIMUM LOSS RATE (for var. loss) - in/hr 0.188 LOW LOSS RATE - DECIMAL 0.85 C 0.00347 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 0.035 0.663 0.030 0.005 0.28 2 30 0.50 0.3 0.053 0.655 0.045 0.008 0.41 3 45 0.75 0.3 0.053 0.647 0.045 0.008 0.41 4 60 1.00 0.4 0.071 0.640 0.060 0.011 0.55 5 75 1.25 0.3 0.053 0.632 0.045 0.008 0.41 6 90 1.50 0.3 0.053 0.625 0.045 0.008 0.41 7 105 1.75 0.3 0.053 0.617 0.045 0.008 0.41 8 120 2.00 0.4 0.071 0.610 0.060 0.011 0.55 9 135 2.25 0.4 0.071 0.602 0.060 0.011 0.55 10 150 2.50 0.4 0.071 0.595 0.060 0.011 0.55 11 165 2.75 0.5 0.088 0.588 0.075 0.013 0.69 12 180 3.00 0.5 0.088 0.580 0.075 0.013 0.69 13 195 3.25 0.5 0.088 0.573 0.075 0.013 0.69 14 210 3.50 0.5 0.088 0.566 0.075 0.013 0.69 15 225 3.75 0.5 0.088 0.559 0.075 0.013 0.69 16 240 4.00 0.6 0.106 0.552 0.090 0.016 0.83 17 255 4.25 0.6 0.106 0.545 0.090 0.016 0.83 18 270 4.50 0.7 0.123 0.538 0.105 0.019 0.96 19 285 4.75 0.7 0.123 0.531 0.105 0.019 0.96 20 300 5.00 0.8 0.141 0.524 0.120 0.021 1.10 21 315 5.25 0.6 0.106 0.518 0.090 0.016 0.83 22 330 5.50 0.7 0.123 0.511 0.105 0.019 0.96 23 345 5.75 0.8 0.141 0.504 0.120 0.021 1.10 24 360 6.00 0.8 0.141 0.497 0.120 0.021 1.10 25 375 6.25 0.9 0.159 0.491 0.135 0.024 1.24 26 390 6.50 0.9 0.159 0.484 0.135 0.024 1.24 27 405 6.75 1.0 0.176 0.478 0.150 0.026 1.38 28 420 7.00 1.0 0.176 0.471 0.150 0.026 1.38 29 435 7.25 1.0 0.176 0.465 0.150 0.026 1.38 30 450 7.50 1.1 0.194 0.459 0.165 0.029 1.52 31 465 7.75 1.2 0.212 0.452 0.180 0.032 1.65 32 480 8.00 1.3 0.229 0.446 0.195 0.034 1.79 33 495 8.25 1.5 0.265 0.440 0.225 0.040 2.07 34 510 8.50 1.5 0.265 0.434 0.225 0.040 2.07 35 525 8.75 1.6 0.282 0.428 0.240 0.042 2.20 36 540 9.00 1.7 0.300 0.422 0.255 0.045 2.34 37 555 9.25 1.9 0.335 0.416 0.285 0.050 2.62 38 570 9.50 2.0 0.353 0.410 0.300 0.053 2.75 39 585 9.75 2.1 0.370 0.404 0.315 0.056 2.89 40 600 10.00 2.2 0.388 0.398 0.330 0.058 3.03 41 615 10.25 1.5 0.265 0.392 0.225 0.040 2.07 42 630 10.50 1.5 0.265 0.387 0.225 0.040 2.07 43 645 10.75 2.0 0.353 0.381 0.300 0.053 2.75 44 660 11.00 2.0 0.353 0.375 0.300 0.053 2.75 45 675 11.25 1.9 0.335 0.370 0.285 0.050 2.62 46 690 11.50 1.9 0.335 0.364 0.285 0.050 2.62 47 705 11.75 1.7 0.300 0.359 0.255 0.045 2.34 48 720 12.00 1.8 0.318 0.354 0.270 0.048 2.48 49 735 12.25 2.5 0.441 0.348 0.375 0.093 4.82 50 750 12.50 2.6 0.459 0.343 0.390 0.115 6.01 51 765 12.75 2.8 0.494 0.338 0.420 0.156 8.11 52 780 13.00 2.9 0.512 0.333 0.435 0.179 9.30 53 795 13.25 3.4 0.600 0.328 0.510 0.272 14.15 54 810 13.50 3.4 0.600 0.323 0.510 0.277 14.41 55 825 13.75 2.3 0.406 0.318 0.345 0.088 4.56 56 840 14.00 2.3 0.406 0.313 0.345 0.092 4.81 57 855 14.25 2.7 0.476 0.308 0.405 0.168 8.74 58 870 14.50 2.6 0.459 0.304 0.390 0.155 8.06 59 885 14.75 2.6 0.459 0.299 0.390 0.160 8.30 60 900 15.00 2.5 0.441 0.295 0.375 0.146 7.62 61 915 15.25 2.4 0.423 0.290 0.360 0.133 6.94 62 930 15.50 2.3 0.406 0.286 0.345 0.120 6.25 63 945 15.75 1.9 0.335 0.281 0.285 0.054 2.81 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 51.629 UNIT TIME -MINUTES 15 LAG TIME - MINUTES #DIV/0! UNIT TIME -PERCENT OF LAG #DIV/0! TOTAL ADJUSTED STORM RAIN -INCHES 4.41 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.3752 MINIMUM LOSS RATE (for var. loss) - in/hr 0.188 LOW LOSS RATE - DECIMAL 0.85 C 0.00347 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 0.335 0.277 0.285 0.058 3.03 65 975 16.25 0.4 0.071 0.273 0.060 0.011 0.55 66 990 16.50 0.4 0.071 0.269 0.060 0.011 0.55 67 1005 16.75 0.3 0.053 0.264 0.045 0.008 0.41 68 1020 17.00 0.3 0.053 0.260 0.045 0.008 0.41 69 1035 17.25 0.5 0.088 0.257 0.075 0.013 0.69 70 1050 17.50 0.5 0.088 0.253 0.075 0.013 0.69 71 1065 17.75 0.5 0.088 0.249 0.075 0.013 0.69 72 1080 18.00 0.4 0.071 0.245 0.060 0.011 0.55 73 1095 18.25 0.4 0.071 0.242 0.060 0.011 0.55 74 1110 18.50 0.4 0.071 0.238 0.060 0.011 0.55 75 1125 18.75 0.3 0.053 0.235 0.045 0.008 0.41 76 1140 19.00 0.2 0.035 0.231 0.030 0.005 0.28 77 1155 19.25 0.3 0.053 0.228 0.045 0.008 0.41 78 1170 19.50 0.4 0.071 0.225 0.060 0.011 0.55 79 1185 19.75 0.3 0.053 0.222 0.045 0.008 0.41 80 1200 20.00 0.2 0.035 0.219 0.030 0.005 0.28 81 1215 20.25 0.3 0.053 0.216 0.045 0.008 0.41 82 1230 20.50 0.3 0.053 0.213 0.045 0.008 0.41 83 1245 20.75 0.3 0.053 0.210 0.045 0.008 0.41 84 1260 21.00 0.2 0.035 0.208 0.030 0.005 0.28 85 1275 21.25 0.3 0.053 0.205 0.045 0.008 0.41 86 1290 21.50 0.2 0.035 0.203 0.030 0.005 0.28 87 1305 21.75 0.3 0.053 0.201 0.045 0.008 0.41 88 1320 22.00 0.2 0.035 0.199 0.030 0.005 0.28 89 1335 22.25 0.3 0.053 0.197 0.045 0.008 0.41 90 1350 22.50 0.2 0.035 0.195 0.030 0.005 0.28 91 1365 22.75 0.2 0.035 0.193 0.030 0.005 0.28 92 1380 23.00 0.2 0.035 0.192 0.030 0.005 0.28 93 1395 23.25 0.2 0.035 0.190 0.030 0.005 0.28 94 1410 23.50 0.2 0.035 0.189 0.030 0.005 0.28 95 1425 23.75 0.2 0.035 0.188 0.030 0.005 0.28 96 1440 24.00 0.2 0.035 0.188 0.030 0.005 0.28 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) 4.41 826,496 647,343 0.96 4.11 179,153 14.41 Plate E-2.2 24 Hour Storm Page 9 of 9 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 March 30, 2020 DLS 1 CORAL MOUNTAIN 2553 BASIN B 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 II 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 HM201 217 IVtEL1°. GSM °�. 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 90,919 32,807 BASIN B [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 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: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0492 0.4169 0 0 CO v d -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 J IIJ y C H ° J m U G J y R 0 • )-•R 0-U100' CG al > • 7mIii 0 LOW LOSS RATE PER RCFC/2322 0.1000 0.8200 LOW LOSS CONDITION DEVELOPED DEVELOPED 1 MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0251 0.2359 0.2610 AREA WEIGHTED AVERAGE 0.492 0.508 (/) W K Q LO LO 7 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] 0 0 00 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 RI NUMBER [Plate E-6.1] 56 56 LAND USE PAVING/HARDSCAPE LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL=. [I ULM SOIL GROUP [Plate C-1] m m 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 &2 ` _ 438.05 438.11 438.17 438.24 %§ 438.53 438.69 438.97 439.66 439.76 439.80 72/ 0.10 0.14 0.18 0.24 )f)/ 1.07 1.10 )c2 1,124 2,613 46,767 47,956 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 154 156 6 co 164 168 172 178 189 208 211 213 154 156 LO 0 164 168 172 178 189 208 211 213 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 1,278 2,770 _ 4,381 6,113 46,979 48,168 . 0 ; 1,278 1,645 1,768 1,890 )§&§/K(§ waw«<;ww Flood Hydrograph Flow cfs 4.26 _ 5.48 7)2)02 23.63 67.28 10.58 4.67 }J 2 0.36 0.46 0.50 0.53 /S//§[Lo 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 Storm Rain in/hr RCFC & WCD G 7DGi0O1. Wf NIG1Gfl. IMIL 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) 3.6 4.2 4.4 4.6 6.4 8.1 13.1 34.5 Time Minutes Hours 0.42 0.50 0 LO Ri 25 30 35 40 45 50 55 _ 60 Unit Time Period .G55.G _+©#¥) §§///(/7f0m/s 1,0 • C• 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 (1) 4 00 o 438.00 438.01 438.01 438.02 438.03 _ 438.05 438.06 438.09 V"(0 00 00 438.14 438.16 N co 00 00 438.27 438.30 a 0') V OO 000000 V O OO (00 (00 OO 438.72 438.78 438.85 5 U t 6 C To N 0.00 0.00 oo O O 0.02 0.03 0.04 0.05 00 O O 0.08 0.09 -- O O 0.15 0.17 0.20 0.23 0.25 0.29 0.33 0.37 0.40 0.44 0.48 Om @ U 105 211 �� 707 1,265 1,550 2,107 M(O0)o0 (`000 C4 N. 3,319 3,874 4,790 5,705 OM(NO (O r OOiO a00i Mrn)(�O V `-ci,F,6 MO 17,588 19,210 20,920 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft N M 0 0 CO M(0(O 0 0 0 0 155 156 N-COCO(O (O O r COO (0 Lf) CO CO 162 164 CO CO O) CO r 174 177 179 182 184 (0(0 N (0 153 154 155 156 156 157 157 158 160 161 162 164 CO 0 0) N. 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 LC) 00) N CO N N N N N CO O O N N N N COOW CO I� N N N N 22,989 23,190 ON) (MI) CO O M M N N 23,833 24,134 24,373 24,673 25,092 25,470 25,808 26,165 26,542 Basin Volume cu -ft 258 363 287 574 861 1,420 1,705 2,263 cq CD COT. N M 3,477 4,032 4,950 5,866 6,781 7,513 8,789 10,155 N 00 I N O N I N 17,767 19,391 1 21,104 N U 258 258 76 440 440 712 440 712 712 440 '-( 1,076 1,076 1,076 894 V 1,258 1,531 2,076 1,894 1.-- WW ,- ,- ,- Flood Hydrograph Flow cfs 0.86 0.86 N 0 O,- 1.47 2.37 1.47 2.37 CO V N,- 1.77 2.37 3.59 3.59 3.59 2.98 W O 70) 0 O 0 OOO 0 CO I, O CO (0 OO Effective Rain in/hr 0 0 O O 0.02 0.12 - N- O O co O O 0.20 0.12 ' N O O 0.30 0.30 0.30 0.25 T. 7 CO O O 0.36 0.43 0.59 0.54 CO O N O O O Loss Rate in/hr Max 1 Low 007 N N O O CO N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 0) 0) CO CO O O 00 0 0 O O 0.48 0.44 (00 O O 0 0 N0) O O 0 0 NO I- CO 0 0 MOO CO CO CO 0 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 CO 0 0 0 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 ((0(00 O O (NO(0 O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD MUDDI3o©I1= Ctrl FACACME 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 T- O O O (n O 1.8 1.5 O CO. N N N N 2.2 2.0 CO r N NNNM 0 r 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 CJN1 o CO 7 N CO 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 65 70 75 80 000 00 O N _ 105 110 (0 0 (O T- T- T- Unit Time Period Tm N CO 0 0 I� CO 0) O , N, 7 15 16 CO 19 20 21 22 CO 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 J W (a CO x °o 438.96 439.09 439.16 439.33 N 0) LO 0 of va 439.88 439.90 439.92 439.93 439.93 U C N 0.54 0.62 0.67 0.78 CO O Om @ C U 23,626 27,056 0) 0) N 39,687 46,008 (0 N N co 0 0 51,409 51,905 51,770 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft CO N CO 0) V 0) 0) 0 204 211 v) v) N N 216 216 216 CO N CO 0) a 0) 0 0 204 211 215 215 0 )0 CO N N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 7227,138 7,678 27,967 28,676 29,447 30,333 30,925 31,020 31,089 31,159 31,140 Basin Volume cu -ft V co CO N (0 I-0) N N 7 co (0 (0 V N CO N 0) 0) N 0) (0O (0 V CO CO 0 N 10 v) 51,625 52,121 51,987 N E j U 2,895 3,622 2,258 5,258 co c+) - vm a 7 co d- N N N n r co Flood Hydrograph Flow cfs r O O N 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 (C00 O — v)a N. - 1.25 0.25 NN0 O O O Loss Rate in/hr Max I Low ON) O o r V o.., h m 1.29 0.44 co co0s- 0 0 0 0.26 0.26 00)00)00)00)0 0 0 0 0 0 0 0 0 0 Storm Rain in/hr CO CO 0 N ,-- 0 0) 0) n O T- n,- CO N- T- N 1.52 0.51 0.46 0.46 0.15 RCFC & WCD GOO oDD o@E Ctrl FACACME 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) N O 0 v) 3.5 6.8 M N I- co 5.9 2.0 co (0 v) ,- O Time Minutes Hours N N N 0 COCOV 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 M (0 (0 34 35 36 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 5 5 0 •C U 0 C U 0 U 0 U N0 c0 70 CO pAjN N 00) CO x (0) (0 O M W 1- g g Z O WW Nr w 0 o • Zmm00 a°1 oco 77'I- BZW gJcoj 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 al co CO 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 5 U c6 C To N 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 O @ m C U 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 88 106 O O 106 123 N N N N Nnr CO CO CO N CO N� N� N� N� N� N 10 N 10 N 10 N� N L 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 C N E J 0 LO ; 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 uJ m CO 0 m CO O O O W W coM 7 438.00 438.00 438.00 438.00 438.00 438.00 O 0 0 CQ W CO CO 7 7 N 0 0 CO CO CO CO 7 7 N CO 0 0 CO CO CO M 7 7 438.04 438.05 438.06 438.08 7 O CV a0 CO M M V 7 0 O a0 CO M M V 7 N N a0 CO M M V 7 CO N N CO a0 CO M M V 7 0 U 4) ; C To N 0 000000000 0 0 6 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 CO 0 0 0 0 CO 0 0 CJ O CO N. 0 0 CJ O 00 0 7 CJ O N _ CJ O CO CO CJ O Om N 00 0 0 0 0 0 0 0 040 N 0 co M O O N M O r 0) V co 903 1,115 1,443 1,889 2,450 _ 3,011 3,688 4,363 5,155 5,946 6,852 f 7,875 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft CO MM MM MM N M IO O M M I000)O COM V IO LO 0 0 LO CO 0(0 0(0(0 152 152 N N 0 0 N N 0 0 N N 0 0 N M 0 0 M M 0 0 M M 0 0 154 154 155 155 156 157 158 159 O N. O O 1 164 SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM C O (p CO 7, d y i s N a CO O) O N co 001001000000000,-•- N N O0) N N N N O0) N N N N O0) N N N N OO O I -- N N N- CO O (Ni N N CO CO M O N N N N N0) M I- N N N N O N O NM N N N N CO I- n O V OI N N N N CO If) V O - O N N N N CD CO O V O N M M N N MO V O V (O M M N N Basin Volume cu -ft 14 131 131 131 131 131 131 131 249 345 440 536 632 _ 845 1,057 1,269 1,598 2,044 O (00 O NM 7 Nin CO O M V 0 CO If) O 0 (O+) O O ISO N E w = E j 15 U M C) M 4) (0 4) (0 0) O 7 V N N CO O 7 V N N CO CO 7 0 N M CO CO 0 0 M M M 0 0 0 7 0 CO CO I� LO 4) M M O O N N( O 4) O O p 0 Flood Hydrograph Flow cfs 0.05 0.44 0.44 0.44 0.44 0.44 0.44 0.44 CO CO CO CO 0 0 CO CO CO O 0 0 CO N CO Cl 0 N N N Cl 0 O O <V 2.39 2.39 2.78 2.78 3.17 3.17 CO CO 0 0) M M U'(C s mcc C0 W 07777777000000 O O O O O O O O O O O O O c' c' O O 71- O O 00 O O 7 a O O l: l N O 0 0a 0 0 Loss Rate in/hr Max 1 Low 0.23 0.25 O 4') N N O O O 4') CO N O O O 4') CO N O O co co CO N O O O O CO N O O co.—CO CO Cr, O O CO CO O O 0.34 _ 0.37 0 CO M O O N N 7 V O O 0.45 _ 0.45 O 7 O O O CO CO N N 0 0 O(0 N N 0 0 O(0 N N 0 0 CO CO N N 0 0 CO CO N N 0 0 CO CO N N 0 0 CO CO N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 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 0') 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 GOO oDD o@E Ctrl NIGICML \E 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% T C 0 4) 0 V W (C0 a a a m F,_ 0 0 0 0 0 0 0 0 O O 0 0 O O 0 0 O O T- T- O O T- T- O 7 T- T- 7 7 T- T- N m. T- T- ,f 7 T- T- I f) 0 T- T- O O T- T- 1- 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 r CO M M 3.92 4.00 4.08 4.17 0 O N CO X LO O M,r LO O cr LO , LO O OO T- T- LO O Or T- , LO O r 0 , LO O CO 0 , LO O 0 0 N LO O 0 N N LO O N N N LO O NM N N LO O M V N N LO O 7 LO N N Unit Time Period L) CO N N O... O N N 29 30 31 32 C) M 01 35 36 O... CO M 01 39 40 41 42 M 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 7) w co w m 2 co 7 Na m Dj co 7 438.47 438.53 438.59 438.65 438.72 438.79 438.87 438.95 439.04 439.15 439.27 439.39 439.54 439.73 439.77 439.76 439.76 439.76 _ 439.75 439.74 6 f0 E C To N 71` N N 0 0 O NM 0 0 co r MM 0 0 OO) 7770 0 0 CO 0 0 O) t07 LO CO 0 0 CO r CO 0 0 CO 1000 0)0000000 0 .- CO s- .- CO r ..- .- h. N- ..- .- O @ m S U6 N O O N j O 11,634 13,000 N. 70 17,788 19,496 CO (L) MN N N 25,775 28,878 O O M- M M N 7 N0) 7 7 47,036 _ 46,956 46,850 _ 46,726 46,568 _ 46,392 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft OO O0 = T O N r N- I T 7N- r N- I T O N CO CO I T- OO CO CO T- % 7h O)0) I% 0) OOH I 0 OT- N N NN N N 0 N 0 0 cO CO ., CO x- x- O N h N. N- T- 7 N. h N- N- T- ON 10 CO N- T- Nc07 M CO N- T- 0) O N- T- N. 0) 0 N- N NT- O N N NN N N N N T- T- N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 0) N 1- 0) 0) T- 107 N N 24,496 24,797 25,124 25,475 N CO O N CO N 6 s N 0 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 Vco 0) s- 14,656 16,254 0 ((00 ,- r) 21,503 23,443 25,966 29,072 (N CO co m 40,717 46,154 47,247 47,167 47,061 46,938 46,779 46,603 O OE C c 15 U 7 O (V M 7 -- - OOOM MM N� - - Nr (O r - 00 O) 0) O (0 f�0 ON O � N (V �r 070 IS N N M W CO O M 7 f�N Oa N t0 7 N— 7 0 co., M OO O O MO O M Flood Hydrograph Flow cfs 1)) 7 M 7 7 CON CO000) 0) (0 IO CO 0) (0 CO CO (O (0 O 0 0 (O r 70) 0 0) O 12.16 13.34 15.29 18.81 4.35 0.44 O0) CO N O O OCV O O N C s Q' C W rM O 0 0 7M M 0 0 7(O 0 0 M M 0 0 0O 0 0 i M 0 0 M M O O M7 0 0 M N 0 0 00 0 0 Loss Rate in/hr Max 1 Low 0.53 0.56 0.59 0.59 N(0 (O(O 0 0 CO OOM O(O 0 0 N.rM 0 0 0.87 1.01 OO N. NO 0 N. CO 0 LC) N O O 0.17 _ 0.14 OD (0 OO O O CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 CO O N N 0 0 Storm Rain in/hr CMD COO 0 0 0 0O 0 0-- 0.73 0.76 0.79 0.79 0.83 0.86 O N M 1.56 1.85 COMM O O 0.20 0.17 s- 0 O O RCFC & WCD GOO DDD o@E Ctrl NIG3MML \E 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) O 101-1- 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 0)0) ,- O 0.6 0.5 MN O O Time Minutes Hours 0) M N M 7 777 N 0 7 O O r 0 O a a (0 CO 1` O a a N 0 0) O a (00)(00)(00) CO r ON- 0 CO N CO N 0 7 0 (0 CO r 0 O 0) (0 0 CO r CO 0) 6 N O O O (n(O (O O (O 0 N N (n 0 CO N- N N (n 0 1` 0 N N (n 0 CO 0) N N (n 0 CO O N CO (n 0 O CO CO (n 0 N CO CO (n 0 0 CO CO CO (n 0 CO 7 CO CO (n 0 7 0 CO CO (n 0 (O 0 CO CO Unit Time Period 51 52 53 54 55 56 57 58 (O O CDD N CD 63 64 O CO CO CO 67 _ 68 CO00 ^ nr EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C 0 V C U V U 0 r- (�O 0 M coO co c, r• 0 N O N N N O1O(+1 •CD'? 7 O N V O N LU 1- z O W W N F W Q Q woo 10 Q Jwm 0 Z W W 0 0 E 0-0 0 w O W 0 0 ca c Z W O0)jOOww4J w< w ¢ 0 0 0 0-- N W J U( Z O 0 0 0—QLLoodL(¢O> I-K10w(JiL1 K20 I-< 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 lN W 4 0 0] 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.00 438.01 438.03 438.06 438.06 438.06 1j 438.08 Total In Basin cu -ft ac -ft O O OO . O 666666666666666666666666666 O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O 00'0 00'0 0 0 0 0 00000000 0 0 0 0 0 0 0 0 0 0 0 0.02 0.03 CO M 7 O O O . 66O O O O O 0 O 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 30 289 777 1,492 0) (D O V W Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 56 84 N 00 cf 00 CO 84 112 N N 7 V 7 V 141 169 0) r (D 6) 197 225 0) r CO 6) N N N N N CO M (D (D N N CO CO N N 281 309 337 365 422 422 450 69 458 460 462 465 10 in I- (D (0 (0 V 7 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 (C) u) I- O 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) 0.13 C 0.00242 Low Loss Rate (percent) 85.00% N 6) 0) 0) N N 6) N N 0) 0) N N 0) 0) 0) 0) N N 0) N T- N 0) 0) N N (D N N N 0) 0) N N (0 CO 0) 0) N N (0 CO 0) 0) N N n M CO 0) 0) N N I` CO CO V 0) 0) N N 21,943 21,949 I` CO co V 6) 0) NN 21,949 21,949 21,956 21,956 21,962 21,962 N CO (D (O 6) 0) NN 21,974 21,980 21,993 21,993 0) (D 0) c- 0) 0) NN 22,007 22,065 CO I` CO - CO N N (0(0 T- 7 N CO CO 7 N N N N N N Basin Volume cu -ft 56 84 W co ld N 7 a 7 a 141 169 (OD W 197 225 (OD W 225 225 253 253 CO CO 309 M M 422 422 450 69 488 749 1,239 1,958 6) C M T- T- N- Volume In cu -ft 56 84 CV CO Tr CO CO N CO N N V V V V 141 169 O) I.--O) (D O 197 225 I.--n O O 225 225 253 253 281 281 309 u) CO M V 422 422 450 69 488 719 O W 60) . N N N V 6Mi Flood Hydrograph Flow cfs (0 6) O O 66666666 0) N O c- 6) 6) 0 0 6) N 0 r 0.12 0.12 (0 (0 OOOOOOOOOOOOOOOOOOOOOO (0 (0 (0 6) 6) N T- N N (D N N 6) N T- N (O (D N N CO CO N N CO CO 7 CO CO r, CO 7 0.47 0.47 0.50 0.08 0.54 0.80 (D O(0 .... r 7 7 7 0 N C U (p E K _00000000000000 W 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 M O O OOOO M M O O 0.03 0.03 0.04 0.04 0.04 0.01 0.05 0.07 0) O— 66666 7 7 6) 0 0 0 Loss Rate in/hr Max I Low 0.030 0.045 0.045 0.060 0.045 0.045 0.045 0.060 O O OO O O 0.075 0.075 0.075 0.075 (n O OO O O 0.090 0.105 10 O ON O O 0.090 0.105 O O NN O O 0.135 0.135 O O UO(1)(n 0 0 O u) -'f 0 0 O u) O 0 0 0.225 0.225 0.240 0.255 0.285 0.300 0.315 0.330 (C) u) O NNO O O O (0 u) V V 00 0.450 0.445 0.440 0.434 0.429 0.424 = V V V 00 0.409 0.404 0.399 0.394 0.389 0.384 0.379 0.374 0.370 0.365 0.360 0.355 0.351 0.346 0.341 0.337 0.332 0.328 WEEM 0.319 0.315 0.310 0.306 0.302 0.298 0.293 0.289 0.285 0.281 0.277 r (0 (D N N N O O O Storm Rain in/hr 0.035 0.053 0.053 0.071 co co 1) N O O O O 0.053 0.071 I� t` O O O O 0.088 0.088 0.088 0.088 00 (0 CO O O O O 0.106 0.123 M N V O O 0.106 0.123 V V 0 0 6) 6) (6 N 0 0 (D (D I. 1` 0 0 (D V r 0) 0 0 0.212 0.229 0.265 0.265 0.282 0.300 0.335 0.353 0.370 0.388 10 (n CO (D (D ((7 N N CO O O O RCFC & WCD Cz11ff7��/DG3MrCIr/Ofn1QV IPllv Z:\HI 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) 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 (6 (0 O O (D I.- O O 0.7 0.8 (D t` O O 0.8 0.8 6) O 0 0 00000 S- T- T- T- r- T- r- S- r- T- r- N N N T- T- N ON 2 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 1"....O C) 3.25 3.50 LO r O 10 V 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 LO r O car.: MEM 7 50 r 0 1-10 8.25 8.50 8.75 9.00 9.25 9.50 N O 6666 N (0 Time Minutes 15 30 45 60 MO 1,..0) 105 120 135 150 165 180 195 210 225 240 255 270 285 300 - O M M 345 360 375 390 405 420 1 450 465 480 495 510 525 540 555 570 585 600 .- OM 7 (0(0(0 Unit Time Period TT N M V (O CO I- CO CO C"- T- N T- T- C) V T- T- 15 16 r- co T- 19 20 N N N CO V N N 25 26 27 28 29 30 N CO M co 7 CO M 35 36 r- c0 CO M 39 40 N M 0-0-0- 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 al 0) m 438.10 438.11 438.13 438.13 438.14 438.21 438.28 438.37 438.47 438.61 438.75 438.81 438.87 438.96 439.04 439.11 439.17 439.23 439.29 439.32 439.35 439.33 439.32 439.30 439.28 439.27 439.25 439.23 439.22 439.20 439.19 439.17 439.15 s— 0) s- Oi 01 V V 439.10 439.08 439.07 439.05 439.03 439.02 439.00 I 438.98 Total In Basin cu -ft ac -ft 0) OOO 0 CO I- 0 0 0.07 0.08 N_ CO .- 0 0 C.- NN 0 0 10 N CO 0 0 0.46 0.49 0.54 0.59 0.64 0.68 N CO 1.-- 1.-- O O 0.78 0.80 0) CO 1.-- 1.-- O O 0.76 0.75 0.74 0.73 N 1.-- 1.-- O O 0.70 0.69 N 1,-O (O0 O O 0.65 0.64 0.63 0.62 (D0 O O 0.59 0.57 0.56 0.55 a I. -- N W P7 r N M 3,182 3,466 5,094 6,938 O N. 0) `—O 15,066 18,506 LO CO O) M N 23,565 25,619 27,700 29,623 31,386 32,990 33,874 34,787 34,301 33,816 33,304 32,794 32,341 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 CO I, (M O O N N MENEM 24,018 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0) CO a 473 473 474 482 490 T- N O L0 L0 528 544 550 557 567 574 580 585 590 595 598 600 599 598 596 595 593 592 591 589 588 586 585 583 582 581 579 578 576 575 573 572 570 569 W co a 473 473 474 482 490 501 512 528 544 550 557 567 574 580 585 590 595 598 600 599 598 596 595 593 592 591 589 588 586 585 583 582 581 579 578 576 575 573 572 569 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 N N N N N 22,604 22,691 22,704 22,767 23,126 23,534 24,031 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 M r, CO CO O CO IS r N N 27,797 27,724 27,655 27,586 27,518 27,445 27,377 27,305 NCV C E N > w 0 U MC 0 N 3,200 3,596 3,655 3,941 5,575 7,429 9,686 12,159 15,593 19,049 20,465 21,909 CV a) m; 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 CO 438.96 438.94 438.92 438.90 438.88 438.86 438.84 438.82 438.80 438.78 Total In Basin cu -ft ac -ft 0.54 I 0.52 LO C) 0.48 0.47 (O 7 7 O O 0 0 0 CO co 23,028 _ 22,550 22,046 21,545 21,046 20,549 20,055 19,563 19,073 Lc) (h N Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 567 564 562 560 558 553 T- CO co 0 V V 0 0 0 567 564 562 560 558 553 T- CO co LO V V 1n 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 0.00242 Low Loss Rate (percent) 85.00% Percolation Area sf 0 27,089 26,984 26,872 26,762 26,651 26,542 26,432 26,324 26,215 N N C a) M N N 22,606 22,103 N 20,605 20,111 19,619 .N E w l0= 3 m> U O N N N N ((CD 0 p N N Volume In cu -ft W L0 W ct COUD 56 56 CO CO 0 CO CO LO LO Flood Hydrograph Flow cfs 0.09 0.06 0.09 0 0 0 0 0 0 0 6666666 Effective Rain in/hr 0 0 0 0 0 0 0 0 0 0 6666666666 Loss Rate in/hr Max Low r 0.045 0.030 0.045 0.030 0.030 0.030 0.030 O O O co M M O O O O O O CD V 0.138 0.137 0.136 0.134 MM Mp1p1 O O O O O O Storm Rain in/hr 0.053 M IM 0.035 0.035 0.035 0.035 M M M 0 0 O O 0 0 0 0 0 0 RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z 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) M N M N N N N N N N 0 0 0 0 0 0 0 0 0 0 o 2 21.75 22.00 22.25 22.50 22.75 23.00 23.25 0 r- o fh t+j 7 N N N Time Minutes 1305 1320 1335 1350 1365 O 0 O_ 0 O W 01 M M N 7 77 7 Unit Time Period 87 88 89 O N M 7 0 CO 01 01 01 01 01 0) 0) EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 5 5.c C U 0 C ==.=..ff _ 6 6 • (NO 001 0 O M O r M M p U M NMM Op c0 � c^ s - W N O 01 7 7011` N M M N Z 0 ww w~ 0 C7 W J Z W W Q OU Lal Owg7 is tj Z W ��_>>wwwOQw co 0 Z_ J w _ X� O< O LL_I Ow W Q W O> F2'(nw LLLL 2LL 2m i-< 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) 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 = l (Et — E2 )(At + A2 + VAiA2 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 March 30, 2020 DLS 1 CORAL MOUNTAIN 2553 BASIN B 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 II 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 HM201 217 IVtEL1°. GSM °�. 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 44,287 10,683 BASIN B [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 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: 3/30/20 AVERAGE ADJUSTED LOSS RATE MIN AVERAGE ADJUSTED INFILTRATION RATE 0.0704 0.2426 co M d -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 0 oJ o J 11 J C H ° J m o 3 y m U y ai N .. > 'R C 0 Y `>) > • G m LL O LOW LOSS RATE PER RCFC/2322 0.1000 0.8200 LOW LOSS CONDITION DEVELOPED DEVELOPED 1 MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0359 0.1373 0.1732 AREA WEIGHTED AVERAGE 0.704 0.296 (1) Q W K Q 4.014 1.687 O 6 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] 0 0 oO PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] 0.51 0.51 RI NUMBER [Plate E-6.1] 56 56 LAND USE PAVING/HARDSCAPE LANDSCAPING RCFC & WCD CzUDGiOO LOO U INIL=. [I ULM SOIL GROUP [Plate C-1] 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 _ 436.02 436.04 436.06 436.09 436.12 436.15 436.19 436.25 436.35 436.63 436.67 436.69 r b m g 0.01 0.03 (O n o 0 o 0 0.09 0.12 0.15 0.19 0.27 0.49 0.53 0.54 « m F a0 F, U 562 1,302 2,100 2,957 M co O O M le 6,470 8,362 11,738 21,476 0) N N N Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft 212 213 214 215 217 219 0 0 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 CO (O 7 CO N R M 0) 31,800 32,214 32,955 35,090 35,408 35,537 Basin Volume cu -ft I 774 1,515 O N N- CO L- N C) 4,148 5,301 ,- (0 0 c0 O 0 (00 11,967 21,720 23,174 23,762 N E 57 z c 0 0 o r iO 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 CO CO N M 3.37 3.57 3.97 4.57 5.36 7.05 O N ,_ N W N •N N = U 7, t 0 i:C W 0.45 0.55 O N 0• CO 0000 O O 0 r 0.93 1.23 O O 0 N- N (4) 0.98 0.48 Loss Rate in/hr Max 1 Low 0.53 0.62 (<0 COC 66666 CO W m 0 1.92 5.07 CO (0O O O r r-1-- 666666666666 rr r-.1-- rr r-.1-- r Storm Rain in/hr N 0(O0(O (O r 666666 r r N- CO O.- L- 0(0000 aN ., .- O.- N 0'- co O RCFC & WCD NIG1Gfl. IMIL 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) 3.6 4.2 4.4 4.6 0 0 0(0 6.4 8.1 13.1 34.5 r 0 0M Time Minutes Hours CON- O 0000 0M N CO 0.42 0.50 CO N- (O (Or 00000 0000 CO O)0 0 O <0 N 25 30 35 40 45 50 55 _ 60 Unit Time Period L- N CO V (O CO r CO 01 ° N C 0 (0 c 0 (0a (00 0 C C U (O U } U 0 N 0 0 0 0 'R r U W rtLO (O N N 00 U :r -r4 0 (O O N 0 a (M.) r 0 r2 N 0 N N N 0 2 a u) W 2 7 J O W G Q O w O z J 0 LL W W co ~ Z W U' 0 W u) J R J D z W W O O O O re LI Z0Wcc>?toc ,ZW f 2 J u)>>> W W w o c 0 W Q W O W O O 00 ' .21:e W 0 Z O(i00Wd<¢0W W 0 0 O W LL LL (0 (0 M Cl -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 0 A >� 0 436.00 436.00 436.00 436.01 436.01 436.02 436.03 436.03 436.04 436.05 436.05 436.06 436.07 436.09 436.10 436.11 CO .- .- N c0 c0 V co 436.17 436.19 N c0 c0 V co 436.26 436.29 436.31 5 t6 ; C N 0.00 0.00 O O O O 0.01 0.02 0.02 0.03 0.03 0.04 0.04 0.05 co O O O 0.08 0.09 ,-,-,-,-,-,- 0 0 0 0 0 0 0.20 0.22 0.24 Om N t U I 66 132 109 263 417 703 857 1,142 1,427 1,580 1,776 2,060 N0 N (V• 3,440 3,810 00 - t00 N (O 7,285 8,136 0 0 Oi 66 Basin Losses Percolation Maximum Percolation Area Percolation Out sf cu -ft cu -ft N N NIN N N N N N M N N M M N N 7 7 N N 215 216 0 I- NIN CO O) N N 220 221 N M N N 225 226 227 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 CO CO 0 O O 0 co co 30,569 30,632 30,694 30,728 30,771 30,833 30,934 31,035 31,135 31,217 31,356 31,504 31,624 31,772 31,978 32,165 M 0C) CO0 N N co M SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Basin Volume cu -ft 277 343 320 474 CD LO 0 O) 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 0 GOOD 0(O 7,507 8,359 9,121 9,927 10,775 a) j U > 277 277 188 366 366 498 366 498 498 366 410 498 CO O (O <0 676 587 853 897 764 897 1,163 1,074 986 1,030 1,074 Flood Hydrograph Flow cfs 0.92 0.92 CO N 0 Cl O,-,-,-,- N f0 N 0 N f0 N 0 (0 N (O Cl I,- 0 Cl 0 0 0 N N N N 0 0 N O) N 2.84 2.99 2.55 2.99 CO CO CO 0 M M 3.29 3.43 3.58 Effective Rain in/hr CO 0 0 TmN 0 0 NN N 0 0 Tm N C 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 COCOO O O 000 N<00 O O O Loss Rate in/hr Max 1 Low CO CO N N O O 7 CO N CO O O 0.33 0.39 0.33 0.39 0.39 0.33 0 0 CO CO O O O 0 7 V O O 0.48 0.44 N- 0) 0 0 0 0 N 0) 0 0 0 0 N CO 1 0 0 0 CO 0 CO CO 0( O 0 0 0 n r- 6 . . 0 0 r N- . . 0 0 r N- . . 0 0 r N- . . 0 0 r N- . . 0 0 r N- . . 0 0 r N- . . 0 0 N- n . . 0 0 N- n . . 0 0 N- n . . 0 0 N- n . . 0 0 N- n N- . . . 0 0 0 Storm Rain in/hr M M 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 COnf0 O O CONco0 O O 0.85 0.80 0.74 0.77 0.80 RCFC & WCD MUDDI3o©I1= Ctrl FACACME 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) MMT- TT, 0 TT, 0 CO TT In 0 TT 1.8 1.5 c0 0 T- T- N N N N 2.2 2.0 CO N- 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 ON) O O 7 N M 1.42 1.50 1.58 1.67 r CO 1.92 2.00 2.08 _ 5 10 15 20 N CO00) 35 40 45 50 55 60 65 70 75 80 00D O O _ 105 110 0 O 0 T- T- T- Unit Time Period m- N M ml 0 40 f-- CO 0 , N, 15 16 19 20 21 22 N N N LO 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 7) w @ 0 0 436.35 436.40 436.43 436.50 436.58 436.67 436.73 436.74 436.75 436.76 436.75 0 0 ; C N 0.27 0.31 0.33 0.39 0.45 0.52 0.57 0.58 0.59 0.59 0.59 Om (6 C U O V CO 0 Co ,- M N CO CO 0 N O V I� 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 co N- M co N N 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 CO N ,- O CO N M M co 33,578 34,121 W a h CO a O co Co 0 Co 0 O L[) co to 35,969 36,024 35,978 Basin Volume cu -ft 12,109 13,796 0 0 CO N 7 1: T T N V 00) CO 0 M T N N O 0 V IO Q5 N N 25,739 25,988 25,777 Volume In cu -ft 0 c0 ) 0 0 1,251 2,713 a M M O) M N M a M W N 498 498 40 Flood Hydrograph Flow cfs 5.20 6.39 V N. CD v of W0 nen oi'''-nNNNo rnto(o 0 0 CO Effective Rain in/hr 0 O 0.73 1.57 1.70 1.93 a a M co ,- O 0.29 0.29 0.02 Loss Rate in/hr Max 1 Low 0( o 0 00 r."-__. CD - MIN:Ms- 1.29 0.44 M 0 0 0 r_ N- 00000000000 N- N- N- N- N- N- N- N- N- Storm Rain in/hr co co 0 N c- O (0 w n O T- n ,- CO N- T- N 1.52 0.51 0.46 0.46 0.15 RCFC & WCD MU oDI o©I1= Ctrl FACACME 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) N 0 0 N 3.5 6.8 CO N I-00 5.9 2.0 W CO. 0 ''O Time Minutes Hours N N N COCOV ON) N N 2.50 2.58 2.67 2.75 CO 0 N N M o N co CO 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 55 5 5 0 0 . 0 0 o 0 0 p 7tg W cN0 I— O) M I� 0 N N (0 n c0 r M rO W 4 O OM O 4-,- 0 X0 - M N Z 0 W Nr 00 LiLALii -JZ,,00 Q�0 0)(/)Q)Z W 11 <Jcoj 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 COca CO 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 f, (6 C To N 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 N 0 U 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0' Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 43 44 44 44 44 101 OO 101 101 101 158 158 158 CO CO 0 0 158 158 158 158 158 158 maim 211 N N N N N N N N N N N N T N N 01 T N N 01 T N N 01 T N N 01 T N N 01 T N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf 7 (0 7 V M M 0 0 M M (0 (0 V V M M 0 0 M M (0 I- V (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 C N J V 7 a 7 a 0 0 0 0 0 0 0 (0 0 0 (0 (0 0 0 (0 (O C O 0 (0 (0 C O 0 (0 (0 C 0 0 (0 (0 0( 0 (O N 11) E o U O j > 43 44 44 44 44 101 101 101 101 101 101 158 0 0 1010 ,_ ,_ 158 158 158 158 158 158 158 158 mEcm 215 Flood Hydrograph Flow cfs nr 10 O O 0.15 0.15 0.15 0.34 7 V COCO O O 7 V CO CO O O 0.34 0.53 co (0 O 0 O O (0 (0 LO LO O O (0 (0 LO LO O O (0 (0 LO LO O O (0 (0 LO LO O O (0 N in N- O O N > 0 U '(p t m Q' s W N (0 0 0 0 0 (0 (0 0 0 0 0 (0 0 0 0 O 0 (0 (p 0 0 O 0 (0 (0 0 0 O 0 (0 O 0 0 O 0 O) O) 0 0 O 0 O) O) 0 0 O 0 O) O) 0 0 O 0 O) O) 0 0 O 0 O) O) 0 0 O 0 O) N 0 0 0 Loss Rate in/hr Max 1 Low nt 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 CO CO N N O O CO CO N N O O CO CO N N O O CO LO N N O O n r` . . 000000000000000000000000 6 0- r` . . 0. r` . . 0- r` . . r` r` . . r` r` . . 0- r` . . r` 0- . . r` 0- . . r` 0- . . r` 0- . . ` 0- N- . Storm Rain in/hr 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 MUDDI3o©I1= Ctrl 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% &,- E CIn E ids) U W N a a m 0 O(0 0 C (O (O OCD (O� OCD n0- OCD n0- OCD nc0 OCD a0 c0 OCD a0 (0 0OOOOOOOOO O (0 O (0 O (0 O 0) Time Minutes Hours ON- O O 0.25 0.33 0.42 0.50 1O0N. (0 O O 0.75 0.83 0)007 O NM 1.42 1.50 1.58 1.67 1.75 1.83 MEM 2.00 O 0) O N 0) O N (0 (0 O (0 a (0 O s (0 (0 O (0 co 0) O CO h.- 0) O r 0 0) O CO CO0) 10 0 0) � 0 0 0 cD N- 0) 0 Unit Time Period I N CO V (0 (D I- CO W O N 7 15 16 r- 0 O O N N N N CO 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 m w w CO ° 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 I. o (0 (0 vv 436.01 436.01 436.02 436.02 436.03 436.03 436.04 436.05 436.06 436.07 436.08 436.09 (0 ro vv 01 U (0 ; C N 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 CO 0 0 0 0 CO 0 0 0 0 N 0 0 0 0 0 co I. 0 0 0 0 03 0) 0 0 0 0 Om @ U O 70,_, N 00 N M N O) V Ln n N N O CO MW M V 0 r W N O CO (00 DD N CONCO0 CO GO M 1) OM (V (V N 10() I— (V CO N CA O CO V Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft CV r- N N 211 211 211 211 211 211 211 211 211 211 211 212 N N N N co 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 N N N N 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 O 0 O O 2 iN U Q ID 0 ,— N , CO M co 0 0 M M 0) V CO CO co co 0 0 M M 10 0 CO CO co co 0 0 M M 0- CO CO CO co co 0 0 M M (O 0 V V 0 0 M M CO N V V V 0 0 M M N LO CO V V 0 0 M M CO N0 O CO N O 0 0 M M I� N N CO 0 0 M M VN. CO V CO r 0 0 M M CO 00 N 0 co W 0 0 M M CO (0 CO I- 0 0— 0 M M M O n co N M M Basin Volume cu -ft N N (D N O a N N N N CO N N CO N N 237 241 302 364 425 486 547 665 783 901 1,075 1,307 1,595 1,883 I� N C.- N O c.i. N N N CD 0 M M N M OD T- N V 0 M M V 0 E w = C j O U > W N (0 N 10 1!") N N 10 1!") N N 10 1!") N N N N n r N N N N n r N N N O n M N M O O M M M M I� V W V M V O O 10 0 W CO 10 10 N 0 N 10 O O N 0 r N CO I� Flood Hydrograph Flow cfs 0.53 0.72 N N 0-000101 0 0 N N 0 0 N N 0 0 0 0 0 0 O 0,-,-,-,- O O 0) CO r r- (O (0 N.N 2.05 2.05 7 CO N V N N U '(p r ; % m cc C W 0) N o 0 0 NN 0 6 NN O 6 NN O 6 (O (O O 6 (O (O O 6 (O 0) O 6 00) O 0 N (00)0) N N 0 0 N N O 0 NN M M 0 0 (O (O M M 0 0 ON M a 0 0 Loss Rate in/hr Max 1 Low 0.23 0.25 L0 ID) NN . O O ID) ID) N N O O ID) ID) N N O O CO W N N O O CO W N N O O CO N COCOCOCOCO7 O O O O 0.34 0.37 0) 0) O O N N V O O 0.45 0.45 CO 7 10 . O O 0- t` n 0- n 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) 010)0)0)01(01 0 0 0 0 0 0 0 0 0 0 0.33 0.36 CO (0 (0 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 GOO oDD o@E Ctrl NIG3MML \E 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% T C C O 25 W 5O) CL 0 0 m 0 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 T- T- 10 W. T- T- O 0 T- T- r T- Time Minutes Hours 2.08 2.17 N M N N 2.42 2.50 2.58 2.67 LO N N 2.92 3.00 3.08 3.17 CO N M M 3.42 3.50 3.58 3.67 LO M M 3.92 4.00 4.08 4.17 L0 O N M N LO O O') (0(0 LO O cr LO % LO O 10 co % LO O co 0- % LO O r M % LO O CO 0 % LO O 0 0 0101010101010101010101 LO O 0 LO O N LO O CVO-1 LO O M V LO O 7 L0 Unit Time Period 1n CO N N 1- CO N N 29 30 31 32 co 7 M M 35 36 0- co M M 39 40 41 42 M 7 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 @ > •w 0 O> 436.14 436.16 436.18 436.20 N 7 NN o 0 7 7 436.27 436.29 N 10 M M 0 0 CO CO 7 7 0 M M T 0 0 CO CO 7 7 436.48 436.53 436.59 436.67 436.69 436.69 436.68 436.68 436.67 436.66 4 O 06666666666666666666666 C ToN c- CV mt 1n r 0) Tm CO N N CO r N N O CO CO CO r CO V 0 M 7 1n Cr 7 0 010 CO CO 010 N N 0 -62 C 0 U N 0013-- W)0 0M 710 O) 0 SR N0 O 0 X007 1` N O 001`1` d7 MM �`- 12,997 14,522 16,215 18,076 20,220 22,874 23,414 _ 23,383 23,181 _ 22,977 22,758 _ 22,529 Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft M Cr, N N O N N N N NM N N N N 0(0 N N N N h0) N N N N Tm CO M Cr, N N CD 0) M Cr, N N N0 7 7 N N N- r 7 7 N N 0(ID 7 7 N N 0LC, 7 7 N N c0 CD N N OT- N N N N NM N N N N 00 N N N N N. 6,c- N N N N M M N N 00001'- CO M N N 7 7 N N r 7 7 N N 0000 7 7 N N 7 7 N N SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Percolation Area sf O r 70)7 71000 7,717)71 010 32,006 32,180 c0 0(0 M0 N N M co 32,749 32,959 (00770100 MW ('1(13)0)M M M (0(0(0(0(0(0(0(0 C0,7,-M,-0 M 0 0M 7 1 n 010 N 0 35,463 _ 35,419 1N MM 1 A 0 CO CO Basin Volume cu -ft O 0 mild 6,217 6,898 7,634 8,427 9,276 10,123 11,026 11,985 N n (0 0 16,450 18,315 20,462 23,120 M (NO (0(0(0(0 N N 7 N N N 23,003 22,775 N E 45 O C j U W V r 0O)O 0 0 0 100 0 O) --------(4N-(4 N N 0 1..... W CO N 0 N r 7 r W 0 WCD - CO 0 M C:, M 0 rN 7 M 77 0- N Flood Hydrograph Flow cfs N CO W . . N N OO OO M M 3.19 3.38 3.57 3.57 0(0 nrn M M 0 rn00O0)(O . 710 MO . O r 0) r r O) 2.62 0.72 0,00)0 . . O O 00 . . O O 0 0'(p s % Q' C W 00) 771061000(06600-N 0 0 NN 0 0 00) 0 0 NN 0 0 NO 0 0 NN 0 NN 000"MN 0)0760000 0 0 0 0 0 0 Loss Rate in/hr Max 1 Low 0.53 0.56 0.59 0.59 N 10 0000 666666 CO CO 0 CO I,-0- 0.87 1.01 O CO Tm Tm N CO CO 000 CO 0 0 0 0.17 _ 0.14 0 0 OO 66 r t` . . 0000000000000000000000 0- 1- . . 0- 1- . . 0- 1- . . 0- 1- . . r 0- . . r 0- . . r r . . 0- r . . 0- r . . 0- 1- . . Storm Rain in/hr CMO (00 6666 O N.O 0.73 0.76 0.79 0.79 0.83 0.86 O ''.- N 0) 1.56 1.85 CO COO 66 0.20 0.17 Om O 66 RCFC & WCD GOO DDD o@E Ctrl NIG3MML \E 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) mo.-..- 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 0)0 .- O 0.6 0.5 MN O O Time Minutes Hours (113(0(0 N M 7 7 O 7 0 7 7 0 r N 0 a a N M r 0 a a N O M O a 0 0 r O N - 1f) ( 0 M N M 1f) ( N O 7 10 1f) 10 0 r 0 0 1f) 10 0 M r 0 1f) 16 N O M O tri (O 0 O 000r 13401(0 0 O N 0 O x000000 N N 0 O N N 0 O N M 0 O M M 0 O N M M 0 O NM M M 0 O 0)77 M M 0 O LO00 M M 0 O M M Unit Time Period 51 52 53 54 55 56 57 58 O W CO 0)0 63 64 (00(00 67 _ 68 (00 � n r EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 5 5 5 5 5 S C U V C 0 U 0 V o t 0 E U (0 n m- M� 7 0 n U (V X001=?7M� (NO, N N O M O N 7 0 M F g z 0 W.(,),= W 00 woo 0) Q J= Z w. 00 E 000 w O 0 D 7 0, Z W '1-w>OOwwWOW J<01— 0 0WWW—"30 WJ O 7 -00d0 ¢I -W O<OI- M W W LLL LL Q 2 0 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 0 J W m Op 4C CO 436.00 436.00 436.00 _ 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.00 436.01 436.02 436.03 436.02 436.02 436.03 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 O O 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 O 0 0 0 0 N 0 0 0 0 N N 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 7 T- CO 0) V N O CO 0) I- M 0, V N CO 0 O) Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft I� N 7 O cr (0777 N (0 O(0 (0 (0 CO 0 CO 0(O 0 0N CO 68 82 (O 0O) (O O� O) N (0O 00) O CO M � �� I- r �� r �� 318 333 438 544 O (O MM O O 638 640 0) N O) MMM O O O 632 632 632 632 632 632 632 632 N N M M 0 0 N N M M 0 0 N N M M 0 0 N N M M 0 0 632 632 632 632 632 632 632 632 633 633 633 633 633 _ 633 632 633 633 633 634 634 10 O CO CO O O 638 640 O) N O) M CO M 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) 0.09 C 0.00160 Low Loss Rate (percent) 85.00% C O O03 N y U Q 0op d N. 7 M M 0 O op 30,344 30,347 30,344 30,344 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 30,365 30,365 30,365 30,368 0 M co 00 op op 30,405 30,408 30,431 30,454 30,497 30,543 30,612 30,704 30,659 30,616 30,677 0 m0 0 27 41 10077 41 55 55 55 68 68 68 68 68 82 0) 00)0) C—D 82 96 110 110 137 137 O� 318 333 438 544 741 952 1,267 1,686 '0 0) 10 Volume In cu -ft 27 41 41 55 77 _ 41 55 0 0 0 (00000 CO 0 CO 0 68 82 82 96 O O 0) 82 96 O O —�-%CV CO M 137 137 _ 137 151 O 318 333 438 544 741 846 952 1,057 N O 10 M70) 7 7 O) Flood Hydrograph Flow cfs CO 1O O 0 O O 0.05 0.06 0.05 0.05 0.05 0.06 00 O O O O 0.08 0.08 0.08 0.08 0.08 0.09 0) v -T- O 0 0 N0) T- 0 0 T- O 0 0 CA N_ 0 0 0.14 0.14 0.15 0.15 (O hN T- O O (0 O T- O O 0.35 0.37 CD CD 7 0 O O 0.82 0.94 Oh 0 7 -- O O)N 7 7 0 O 0- Effective Rain in/hr 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 N O O O O N N O O O O N N O O O O N N O O O O N N O O O O N N O O O O M CO O O O O M CO O O O O O N O O O O 0 CO O O O O 0 T- O 7 O O 0.14 0.16 0 0 T— N O O 0 O) 0 O O Y— . O O O Loss Rate in/hr Max 1 Low O 1O CO 7 O O O O 0.045 0.060 0.045 0.045 0.045 0.060 O O 00 O O O O 0.075 0.075 0.075 0.075 0.075 0.090 O 10 0) OO_ O 0 0 0 O 7 N0) 0 0 O 10 O O 0 0 0.120 0.120 0.135 0.135 O O 01000 O O O 10 O O O 0) a_O O) O O 0.225 0.225 0.240 0.255 LO O COO N CO O O 0.315 0.330 LO O O N NO N N(0 0 0 0 0.306 0.302 0.299 0.295 0.292 0.288 0.285 0.282 0.278 0.275 0.271 0.268 0.265 0.261 0.258 0.255 N co 10777 N N CV O O 1O N N N O O 0.239 0.236 0.233 0.230 I� 7 N NN N N O O 0 7 N N O O _ 0.215 0.212 0.209 0.206 0.203 0.200 0.197 0.195 0.192 0.189 I- 7 0000-- O O 7 O) 0 0 - O O O Storm Rain in/hr 0.035 0.053 0.053 _ 0.071 0.053 0.053 0.053 0.071 0.071 0.071 0.088 0.088 0.088 0.088 00 CO O O O O 0.106 0.123 0.123 0.141 0.106 0.123 0.141 0.141 0) 0)0 N O 0 0 CID r r 0 0 07 r 0) 0 0 0.212 0.229 0.265 0.265 0.282 0.300 0.335 0.353 0.370 0.388 101001 ClCD N M O O O RCFC & WCD FAzamaL 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 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 co N O O 0.7 0.8 co n O O 0.8 0.8 O) O) 0 0 O O T- T- O 7 T- T- 1.2 1.3 1.5 1.5 0 h T- T- 1.9 2.0 7 N N N lO CO O T- N O 2 0.25 0.50 0 0 h 0- O 7 1.25 1.50 1.75 2.00 2.25 2.50 CO 0 O N M CO 0 N CO1O 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 0 O h O N 0 8.25 8.50 O O h O 0 O) 9.25 9.50 O O h O) O N 100 n O O O Time Minutes uP M 45 60 n OOj 10 O O 135 150 165 180 0 O O)01 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 (0 O 1O 7 0 0 0 Unit Time Period T -N co V 00 I- 00) O7 U) N( CV 7 01 0 17 18 19 20 N N N N 25 26 27 28 29 _ 30 N M M 33 34 1OO M M 37 38 39 40 N M 7 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 W N v 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 S V V 436.10 I 436.08 Total In Basin cu -ft ac -ft C) O O _ 0.03 0.04 0.04 0.04 CO CO O O 0 0 L- CO r 0 0 h T- N 0 0 0.22 0.24 0.26 0.29 0.31 0.33 0.35 0.36 0.37 0.38 0.36 0.35 CO N CO CO O O 0 0) CO N O O 0.28 0.26 0.25 0.23 0.22 0.20 0) I. 0 O 0.16 0.15 CO N _ N. 0 0 0 0) T- 0 0 0 D. -(O 0 0 0 0 O N 1,419 1,640 O W 7 OO 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 13,895 nM O7 NO �� 12,022 11,389 OM OL- f...W OOT 9,496 8,848 8,217 7,602 (O0) D. CO 00 5,719 5,102 4,488 3,863 77 LO CO NO (MN Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft O 7 CO 641 642 643 643 r- 7 up 0 0 ON () (O 0 0 W N- O N. 0 0 680 683 688 692 OO 0) O O r 704 707 O) O T- r r 708 705 N0) O 0) r CO O M O) 0) O CO 0 I- O) CO O CO 684 681 CO U) I� NT O CO 673 670 N-7 (O CO O CO co (O U) O CO 655 653 650 647 640 641 642 643 643 647 651 656 662 0) I- O I- OO 680 683 I 688 1 692 O O W O O n 704 707 0) � O I.- t` 708 705 N O) O O r O O CO O) O OO O f- O) CO OO 684 681 O IO I� r OO 673 670 N- O O O O co O N OO 655 653 650 647 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 T- CMO T-7 N N M co 32,628 32,775 33,003 33,214 N CO 7(O M M co co 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 O V NT- N N co co 32,008 31,868 31,732 31,596 31,461 31,323 N N T- CD co co CE w y (p = 3 m; U O �- M O O O N N N0 2,334 2,489 3,295 4,200 5,297 6,492 8,150 9,812 up V L- 12,190 13,149 14,116 14,997 15,794 16,507 16,862 17,226 16,570 15,917 15,254 14,593 13,963 13,336 12,712 12,076 11,444 10,815 10,174 9,523 8,889 8,271 7,643 7,003 O O co O CO f� O IA 5,143 4,515 3,904 3,281 Volume In cu -ft O N CD 850 863 694 798 1,449 1,553 1,748 1,851 2,319 2,331 1,339 1,351 1,727 1,647 1,658 1,578 1,497 1,417 1,062 1,072 55 55 41 41 CO CO CO CO 68 55 55 55 I� 7 N O 7 I!) I- 7 N 41 41 1` 7 N r 7 N Flood Hydrograph Flow cfs CO 00 . 70 )0 . 0 0 0.77 0.89 M OIC 1.94 2.06 2.59 1.49 1.50 N CO 0)O 1.84 1.75 OIC VD. LO T- T- O0) T-, T- T- CO CO OO O O 0.05 0.05 0.08 0.08 CO CO OOOO 0 O CO O 0 0 0.05 0.03 0.05 0.06 0.05 0.03 0.05 0.05 0.05 0.03 0.05 0.03 Effective Rain in/hr T 018 I I N M O 0 0.13 0.15 0.28 0.30 0.34 0.36 0.45 0.45 0.26 0.26 0.33 0.32 M O O 0.29 0.27 0.21 0.21 O O O O O O O O O O O O O 0 O O 0 0 O O 0 0 0 O 0 0 0 O 0 0 0 O 0 0 O O 0 0 O O 0 0 O 0 Loss Rate in/hr Max I 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 LO O O 0) 7 CO O O 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 0.060 O O CO CO O O O O 0.045 0.030 0.045 0.060 0.045 0.030 0.045 0.045 0.045 0.030 0.045 0.030 C) I- 0 OOM N- CO 0 0 0 CO 0 0 OO7 0 0 0 0 0 0 0 0 0.149 I- O 7 7 O O 0.142 0.140 OO CO CO O O 0.134 0.132 OO CO N O O 0.126 0.124 0.122 0.120 On 0 0 OM 0 0 NOO Y- 0 0 N- 0 0 0 0 107 0 0 0 0 N 0 0 0 0 O CO 0 0) O 0 0 1...- VD 0) 0) O O 0 0 0.095 0.094 Storm Rain in/hr CO O CO O 0.335 0.335 0.300 0.318 0.441 0.459 0.494 0.512 O O O O CO O O O 0.406 0.406 0.476 0.459 0.459 0.441 0.423 0.406 0.335 0.335 0.071 0.071 0.053 0.053 0.088 0.088 0.088 0.071 0.071 0.071 0.053 0.035 0.053 0.071 0.053 0.035 0.053 0.053 0.053 0.035 0.053 0.035 RCFC & WCD FAzamaL 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) O N,_,_,_, CP? CD. I,O )OO N N 2.8 2.9 77 co M MM N N I -O N N 2.6 2.5 7M N N 0)C) 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 O CD. N IO 11.75 12.00 12.25 12.50 12.75 13.00 O O N )O 13.75 14.00 O O N )O 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 OM O 675 690 705 720 735 750 765 780 795 810 825 840 855 870 885 900 IO O O O 945 960 IO 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 MiEaM 1290 Unit Time Period 7 7 Lf) O 7 7 47 48 49 50 51 52 M 7 (O O 55 56 h co (O O 0)O (O O N O O 63 64 O CO O O I- CO O CO 0)O 0 I- N n I` 73 74 75 76 D- CO r- h 0)O CO N CO CO 83 84 I 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 J w CO 436.06 436.04 436.02 436.01 436.00 436.00 436.00 436.00 436.00 1 436.00 I Total In Basin cu -ft ac -ft M M N 0.00 0.00 00 0.00 0.00 O 000 O O O O O O O 0 O p MRIZM 820 0 0 0 0 0 0 N Basin Losses Maximum Percolation Percolation Out cu -ft cu -ft 0 QD co 636 239 27 27 N N N C 641 639 636 633 632 632 MEM 632 N 0 0 M 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% Percolation Area sf N 30,786 30,654 30,520 30,387 7 c 30,341 30,341 c O O co MM O O MM M O M N 2,675 2,059 1,458 847 239 •C .-- m N N N N N Volume In cu -ft N- 27 F- C- . N ch N N N N N Flood Hydrograph Flow cfs 0.05 c11.60000000 0 0 0 0 0 0 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 6666666666 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 0.093 I N0) 0) 00) W 0.089 0.088 0.087 0.087 I 0.087 I 0000 O O O O Storm Rain in/hr 0.053 N CO 0.035 0.035 0.035 0.035 0.035 0.035 0.035 M (0 00 66 RCFC & WCD C,1Vff IDL3M�0OnndOO a3Z 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 CO 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 0 (0 1410 1425 O W 0) MOD V V Unit Time Period 87 88 89 O N M 7 0 (0 0)0)0)0)0)0)0) EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY C 0 0) sE V C ( 0 3 V t 0 3 V 0) V U 7 (moo CQ (u co a' U) 0 M c0 N v_ 0) M N M N (0 N 0)00) 06.0d,1 -"d06 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) 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= l7Ei—E2 Ai+A2+AiA2) 3 Basin Volume Worksheet Page 13 of 13 Coral Mountain Preliminary 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 March 30, 2020 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREA 'A' i Enter the Area Tributary to this Feature (ATRIB) ATRIB = 162.745 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (AIMp) 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 = 0.858If3 - 0.7842+ 0.774If + 0.04 CBMP = 0.19 I 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 (ft) = 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 March 30, 2020 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREA 'B' i Enter the Area Tributary to this Feature (ATRIB) ATRIB = 41.586 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (AIMP) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMP = IF = 17.518 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 = 0.858If3 - 0.7842+ 0.774If + 0.04 CBMP = 0.29 I 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 (ft) = 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 March 30, 2020 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREA 'C i Enter the Area Tributary to this Feature (ATRIB) ATRIB = 10.191 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (AIMp) Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB AIMp = IF = 4.420 acres 0.43 Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Use the following equation based on the WEF/ASCE Method CBMP = 0.858If3 - 0.7842+ 0.774If + 0.04 CBMP = 0.30 I 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 (ft) = Vii (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) Vu = VBMp = 0.12 (in*ac)/ac 4,424 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 = 0.61 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 March 30, 2020 Designed By DLS Company Project Number/Name CORAL Drainage Area Number/Name DRAINAGE AREA 'D' i Enter the Area Tributary to this Feature (ATRIB) ATRIB = 28.403 acres Determine the Impervious Area Ratio Determine the Impervious Area Within ATRIB (AIMp) 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 = 0.858If3 - 0.7842+ 0.774If + 0.04 CBMP = 0.34 I 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 (ft) = 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. WAVE - MSA JOB #2553 February 28, 2020 Designed By DLS Company Project Number/Name THE Drainage Area Number/Name DRAINAGE AREA 'E' i 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 - 0.7842+ 0.7744 + 0.04 CBMP = 0.23 I 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 (ft) = 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 Coral Mountain Preliminary Hydrology Report Appendix H Existing Topography Exhibit Synthetic Unit Hydrograph Exhibits 58th Avenue Planning Area VIII Future Low Density Residential (3) JM • 7 1 DI Planning Area VIII Future Low Density Residential (2) Density Residen#al (1) \\\ Planning Area VIII Future Low Density Residential (4) *\, EXISTING BASIN---„, g Area IX The Farm\) ,---EXISTING CATCH Village 2 Planning Area VIII Future Low Density Residential (5) Planni Area X r pace Pop -Up Village 3 7/7 1/4 \ \ \ /\ \ \ ',,/ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ JIMML \\ \\ \�, \ \ \ \ \ \ \ \ \ \ �. \ 4 \/ \ Pop -Up Village 4 0 PA X /7 , N Back of '- se 0 EXISTING LEVEE—/ DIKE NO. 4 60th Avenue 0' 200' oR•, 400' 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 OCTOBER 2019 CITY OF LA QUINTA TTM 37815 - CORAL MOUNTAIN EXISTING TOPOGRAPHIC EXHIBIT DESIGN BY DLS DRAWN BY DLS CHECK BY MSR SHEET 1 OF 1 SHEETS 462.3 0011. A. e DA -H A=7.118 Planning Area VIII Future Low Density Residential (3) DA -G A=35.742 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) EXISTING BASIN EXISTING CATCH BASIN PROPOSED LAKE \ & RETENTION \\ PROPOSED TEMPORARY RETENTION Pop -Up Village 1 Beach Club g Area IX esort (3) (7 The Farm) `PROPOSED LAKE & RETENTION EXISTING BASIN EXISTING CATCH BASIN Pop -Up Village 2 Planning Area X Open Space Planning Area VIII Future Low Density Residential (5) \ \ \ SF \ \ \ \ \°if. \ \ \ \ \ '9L\ F \\\\ \\ %\�c \\, \\\\ \\ \\,Q \ ` s \ \ \ \\tiT \ \ \ \ \°ti \ \ \ \ \,_ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ `\Pla"ni g\Area IX \ \ \ ` urf �)\ Resork 2 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Coral Mountain LAND USE LEGEND DA -A1 L=1,180 A=88.412 Pop -Up \\ Village 3 \ PA IX Surf Resort (1) DA -E L=780 A=61.802 The Hotel 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 RETENTION \ \ \ � �4 \ \ \ \ �� \ \ V \ \ \ \ \ \ \ \ \ \ \ \ \ \\\\ \ \ PROPOSED RETE\NTIOCI `\ `\ DA -OFF (S) A=5.701 Pop -Up Village 4 DA -A3 L=1,050 A=24.968 Open •ace Pop -Up Village 5 Back oN House 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 3,178,217 DA -B 41.586 17.518 17,618 2.43 292,016 DA -C 10.191 4.420 4,424 0.61 57,966 DA -D 28.403 14.157 13,950 1.92 168,719 DA -E 61.802 19.059 20,610 2.84 1,216,389 600' 800' SCALE 1"=200' XX L -XX A=XX LEGEND DRAINAGE DIRECTION TRIBUTARY DRAINAGE AREA BOUNDARY DRAINAGE SUB -AREA ID FLOW TRAVEL LENGTH (FT) AREA (AC) FEBRUARY 2020 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 - 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 11 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 11 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 11 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 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 10.191 452.74 0.74 STORM EVENT SUMMARY - 100 YEAR EVENT DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.13 1.23 1.21 1.12 FLOOD VOLUME (cu -ft) (acre -ft) 41,768 0.96 45,432 1.04 44,947 1.03 41,485 0.95 STORAGE PROVIDED (cu -ft) (acre -ft) 57,966 1.33 PEAK FLOW (cfs) N/A 18.44 15.86 3.41 MAXIMUM WSEL (ft) DEPTH (ft) 453.40 1.40 453.39 1.39 453.26 1.26 452.74 0.74 BASIN VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 452 0.0 25,035 0.00 0.00 453 1.0 28,965 26,976 0.62 454 2.0 33,060 57,966 1.33 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 1.27 1.26 FLOOD VOLUME (cu -ft) (acre -ft) 119,475 2.74 134,950 3.10 1.28 132,055 1.28 132,086 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 10.24 452.20 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 '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 4.43 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) 173,523 3.98 173,475 3.98 176,875 4.06 156,543 3.59 PEAK FLOW (cfs) N/A 78.28 66.94 12.58 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 4.43 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 PEAK FLOW (cfs) N/A 62.43 53.39 10.03 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 47,483 1.10 56,379 1.29 67,518 1.55 PEAK FLOW (cfs) N/A 14.42 12.62 3.71 DRAINAGE AREA 'I' PROPOSED LAND USE SUMMARY LAND USE OFF-SITE AREA (acres) RI NUMBER AMC 11 INFILTRATION RATE (in/hr) IMPERVIOUS DECIMAL PERCENT 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 4.43 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 PEAK FLOW (cfs) N/A 90.09 77.02 14.41 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 5.701 126,903 2.91 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) 126,903 2.91 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 FEBRUARY 2020 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