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Coral Mtn Preliminary Hydrology ReportFor 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 April, 2020 Prepared for: CM Wave Development, L.L.C. 2440 Junction Place, Suite 200 Boulder, CO 80301 JN: 2553 ` 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 April, 2020 Prepared for: CM Wave Development, L.L.C. 2440 Junction Place, Suite 200 Boulder, CO 80301 JN: 2553 ` PRELIMINARY HYDROLOGY REPORT 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 1 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 prop erty 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 06065C 2900G, 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, n umerous 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 shrin k-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”. Coral Mountain Preliminary Hydrology Report 2 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: 0.358 inches 10 Year – 1 Hour Precipitation: 0.711 inches 10 Year –3 Hour Precipitation: 1.06 inches 10 Year – 6 Hour Precipitation: 1.36 inches 10 Year – 24 Hour Precipitation: 2.23 inches 100 Year – 1 Hour Precipitation: 1.44 inches 100 Year – 3 Hour Precipitation: 2.14 inches 100 Year - 6 Hour Precipitation 2.76 inches 100 Year – 24 Hour Precipitation 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. Coral Mountain Preliminary Hydrology Report 3 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 ‘A1’ & ‘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’. Coral Mountain Preliminary Hydrology Report 4 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 r emain 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 exis ting 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. Coral Mountain Preliminary Hydrology Report Appendix A Riverside County TLMA Vicinity Map IMPORTANT* Maps and data are to be used for reference purposes only. Map features are approximate, and are not necessarily accurate to surveying or engineering standards. The County of Riverside makes no warranty or guarantee as to the content (the source is often third party), accuracy, timeliness, or completeness of any of the data provided, and assumes no legal responsibility for the information contained on this map. Any use of this product with respect to accuracy and precision shall be the sole responsibility of the user. Riverside County GIS Legend Latitude: 33.6202 Longitude: -116.2562 Notes REPORT PRINTED ON...9/18/2019 9:08:13 AM CORAL MOUNTAIN MSA Job No. 2553 0 3,0091, 505 Feet Blueline Streams Survey City Areas World Street Map Coral Mountain Preliminary Hydrology Report Appendix B NFIP Flood Insurance Rate Map USGS The National Map: Orthoimagery. Data refreshed April, 2019. National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250Feet Ü116° 15'18.16"W 33° 36'49.57"N 116° 14'40.70"W 33°36'19.61"N SEE FIS REPORT FOR DETAILEDLEGENDANDINDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOODHAZARD AREASWithoutBaseFlood Elevation (BFE)Zone A, V, A99With BFE or Depth Zone AE, AO, AH, VE, ARRegulatoryFloodway0.2% AnnualChanceFloodHazard, Areasof 1% annual chancefloodwithaveragedepthlessthanonefootorwith drainageareas of lessthanonesquaremileZoneXFutureConditions1% AnnualChanceFloodHazardZoneXAreawith Reduced Flood Risk due toLevee. See Notes.Zone X Area with Flood Risk due to Levee Zone D NO SCREE N Area of Minimal Flood Hazard Zone X Area of UndeterminedFloodHazardZoneD Channel, Culver t, or StormSewerLevee, Dike, or FloodwallCrossSections with 1% AnnualChance17.5 Water Surface ElevationCoastal Transect Coastal Transect BaselineProfile BaselineHydrographic FeatureBaseFlood Elevation Line (BFE)Effective LOMRs Limit of StudyJurisdiction Boundar y Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracystandardsThefloodhazardinformationisderiveddirectlyfromtheauthoritativeNFHLwebservicesprovidedbyFEMA. This mapwas exported on 9/18/2019 at 12:24:12 PM anddoesnotreflectchangesoramendmentssubsequenttothisdateandtime. The NFHL and effective information may change orbecome superseded by new data over time.This map image isvoidiftheoneormoreofthefollowing mapelements do not appear: basemap imagery, flood zone labels,legend, scale bar, map creation date, community identifiers,FIRMpanelnumber, and FIRM effective date. Mapimages forunmapped and unmodernizedareascannot be used forregulatory purposes. Legend OTHER AREAS OFFLOOD HAZARD OTHER AREAS GENERALSTRUCTURES OTHERFEATURES MAP PANELS 8 1:6,000 B 20.2 The pin displayed on the map is an approximate point selected by the user USGS The National Map: Orthoimagery. Data refreshed April, 2019. National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250Feet Ü116° 15'17.67"W 33° 37'53.05"N 116° 14'40.22"W 33°37'23.10"N SEE FIS REPORT FOR DETAILEDLEGENDANDINDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOODHAZARD AREASWithoutBaseFlood Elevation (BFE)Zone A, V, A99With BFE or Depth Zone AE, AO, AH, VE, ARRegulatoryFloodway0.2% AnnualChanceFloodHazard, Areasof 1% annual chancefloodwithaveragedepthlessthanonefootorwith drainageareas of lessthanonesquaremileZoneXFutureConditions1% AnnualChanceFloodHazardZoneXAreawith Reduced Flood Risk due toLevee. See Notes.Zone X Area with Flood Risk due to Levee Zone D NO SCREE N Area of Minimal Flood Hazard Zone X Area of UndeterminedFloodHazardZoneD Channel, Culver t, or StormSewerLevee, Dike, or FloodwallCrossSections with 1% AnnualChance17.5 Water Surface ElevationCoastal Transect Coastal Transect BaselineProfile BaselineHydrographic FeatureBaseFlood Elevation Line (BFE)Effective LOMRs Limit of StudyJurisdiction Boundar y Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracystandardsThefloodhazardinformationisderiveddirectlyfromtheauthoritativeNFHLwebservicesprovidedbyFEMA. This mapwas exported on 9/18/2019 at 12:32:40 PM anddoesnotreflectchangesoramendmentssubsequenttothisdateandtime. The NFHL and effective information may change orbecome superseded by new data over time.This map image isvoidiftheoneormoreofthefollowing mapelements do not appear: basemap imagery, flood zone labels,legend, scale bar, map creation date, community identifiers,FIRMpanelnumber, and FIRM effective date. Mapimages forunmapped and unmodernizedareascannot be used forregulatory purposes. Legend OTHER AREAS OFFLOOD HAZARD OTHER AREAS GENERALSTRUCTURES OTHERFEATURES MAP PANELS 8 1:6,000 B 20.2 The pin displayed on the map is an approximate point selected by the user USGS The National Map: Orthoimagery. Data refreshed April, 2019. National Flood Hazard Layer FIRMette 0 500 1,000 1,500 2,000250Feet Ü116° 15'17.07"W 33° 37'35.63"N 116° 14'39.62"W 33°37'5.67"N SEE FIS REPORT FOR DETAILEDLEGENDANDINDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOODHAZARD AREASWithoutBaseFlood Elevation (BFE)Zone A, V, A99With BFE or Depth Zone AE, AO, AH, VE, ARRegulatoryFloodway0.2% AnnualChanceFloodHazard, Areasof 1% annual chancefloodwithaveragedepthlessthanonefootorwith drainageareas of lessthanonesquaremileZoneXFutureConditions1% AnnualChanceFloodHazardZoneXAreawith Reduced Flood Risk due toLevee. See Notes.Zone X Area with Flood Risk due to Levee Zone D NO SCREE N Area of Minimal Flood Hazard Zone X Area of UndeterminedFloodHazardZoneD Channel, Culver t, or StormSewerLevee, Dike, or FloodwallCrossSections with 1% AnnualChance17.5 Water Surface ElevationCoastal Transect Coastal Transect BaselineProfile BaselineHydrographic FeatureBaseFlood Elevation Line (BFE)Effective LOMRs Limit of StudyJurisdiction Boundar y Digital Data Available No Digital Data Available Unmapped This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracystandardsThefloodhazardinformationisderiveddirectlyfromtheauthoritativeNFHLwebservicesprovidedbyFEMA. This mapwas exported on 9/18/2019 at 12:29:49 PM anddoesnotreflectchangesoramendmentssubsequenttothisdateandtime. The NFHL and effective information may change orbecome superseded by new data over time.This map image isvoidiftheoneormoreofthefollowing mapelements do not appear: basemap imagery, flood zone labels,legend, scale bar, map creation date, community identifiers,FIRMpanelnumber, and FIRM effective date. Mapimages forunmapped and unmodernizedareascannot be used forregulatory purposes. Legend OTHER AREAS OFFLOOD HAZARD OTHER AREAS GENERALSTRUCTURES OTHERFEATURES MAP PANELS 8 1:6,000 B 20.2 The pin displayed on the map is an approximate point selected by the user Coral Mountain Preliminary Hydrology Report Appendix C USDA NCSS Hydrologic Soils Map Hydrologic Soil Group—Riverside County, Coachella Valley Area, California THE WAVE) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/18/2019 Page 1 of4371910037194003719700372000037203003720600372090037212003721500371910037194003719700372000037203003720600372090037212003721500568100568400568700569000569300569600569900568100568400568700569000569300569600569900 33° 37' 56'' N 116° 16' 1'' W33° 37' 56'' N116° 14' 42'' W33° 36' 28'' N 116° 16' 1'' W33° 36' 28'' N 116° 14' 42'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 0 500 1000 2000 3000 Feet 0 150 300 600 900 Meters Map Scale: 1:13, 200 if printed on A portrait (8.5" x MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Riverside County, Coachella Valley Area, California Survey Area Data: Version 10, Sep 13, 2018 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Dec 31, 2009—Oct 14, 2017 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—Riverside County, Coachella Valley Area, California THE WAVE) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/18/2019 Page 2 of 4 Hydrologic Soil Group 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% Hydrologic Soil Group—Riverside County, Coachella Valley Area, California THE WAVE Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/18/2019 Page 3 of 4 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 Hydrologic Soil Group—Riverside County, Coachella Valley Area, California THE WAVE Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/18/2019 Page 4 of 4 Coral Mountain Preliminary Hydrology Report Appendix D NOAA Atlas 14 RCFCD Reference Plates 9/18/2019 Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=33.6202&lon=-116.2562&data=depth&units=english&series=pds 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 | PF_graphical | Maps_&_aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Duration Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min 0.066 0.056 0.080) 0.103 0.086 0.124) 0.156 0.130 0.189) 0.203 0.168 0.249) 0.277 0.221 0.350) 0.340 0.265 0.440) 0.412 0.313 0.547) 0.494 0.365 0.675) 0.622 0.440 0.887) 0.737 0.504 1.09) 10-min 0.095 0.080 0.115) 0.147 0.123 0.178) 0.223 0.186 0.271) 0.292 0.241 0.357) 0.397 0.316 0.502) 0.488 0.380 0.631) 0.590 0.449 0.783) 0.708 0.524 0.967) 0.891 0.631 1.27) 1.06 0.722 1.56) 15-min 0.115 0.096 0.139) 0.178 0.148 0.215) 0.270 0.225 0.327) 0.353 0.291 0.432) 0.480 0.382 0.607) 0.590 0.460 0.763) 0.714 0.543 0.947) 0.856 0.633 1.17) 1.08 0.763 1.54) 1.28 0.873 1.89) 30-min 0.165 0.138 0.200) 0.255 0.213 0.309) 0.387 0.322 0.470) 0.506 0.418 0.619) 0.688 0.549 0.872) 0.846 0.660 1.10) 1.02 0.780 1.36) 1.23 0.909 1.68) 1.55 1.10 2.21) 1.83 1.25 2.71) 60-min 0.232 0.194 0.280) 0.358 0.299 0.433) 0.543 0.452 0.660) 0.711 0.586 0.870) 0.966 0.771 1.22) 1.19 0.927 1.54) 1.44 1.10 1.91) 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) 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 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) 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 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 0.961 1.25) 1.67 1.48 1.93) 2.52 2.22 2.91) 3.26 2.85 3.80) 4.36 3.69 5.25) 5.28 4.38 6.48) 6.28 5.09 7.90) 7.38 5.83 9.54) 9.01 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 1.19 1.55) 2.15 1.90 2.49) 3.32 2.93 3.85) 4.35 3.81 5.08) 5.88 4.98 7.08) 7.14 5.93 8.77) 8.49 6.89 10.7) 9.96 7.87 12.9) 12.1 9.16 16.2) 13.8 10.1 19.2) 60-day 1.42 1.26 1.64) 2.31 2.04 2.67) 3.60 3.17 4.17) 4.73 4.14 5.52) 6.40 5.42 7.71) 7.78 6.46 9.56) 9.27 7.52 11.7) 10.9 8.58 14.0) 13.2 9.98 17.7) 15.0 11.0 20.9) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. PF graphical PROJECT NAME PROJECT NUMBER 2553 STORM EVENT 100 yr DATE: MINUTES RAINFALL RAINFALL INTENSITY DEPTH in/hr)(in) 5 4.94 0.41 10 3.54 0.59 15 2.86 0.71 30 2.04 1.02 60 1.44 1.44 120 0.92 1.83 CONSTANT FROM GRAPH 11.76 EXPONENT FROM GRAPH -0.52 MINUTES RAINFALL RAINFALL INTENSITY DEPTH in/hr)(in) 5 5.09 0.42 10 3.55 0.59 15 2.88 0.72 20 2.48 0.83 25 2.21 0.92 30 2.01 1.00 35 1.85 1.08 40 1.73 1.15 45 1.62 1.22 50 1.54 1.28 55 1.46 1.34 60 1.40 1.40 65 1.34 1.45 70 1.29 1.51 75 1.25 1.56 80 1.20 1.61 85 1.17 1.65 90 1.13 1.70 95 1.10 1.74 100 1.07 1.79 105 1.05 1.83 110 1.02 1.87 115 1.00 1.91 120 0.98 1.95 INTENSITY VALUES FROM GRAPH NOAA ATLAS 14 INTENSITY - DURATION WORKSHEET THE WAVE DATA FROM NOAA ATLAS 14 September 18, 2019 y = 11.76x-0.52 0.10 1.00 10.00 1 10 100 1000 Coral Mountain Preliminary Hydrology Report Appendix E Preliminary Land Use Worksheets MSA JOB #2553 HYDROLOGIC SOIL GROUP B DRAINAGE AREA ROCK EXIST STREETS WATER COMMERCIAL PROPOSED PROPOSED PROPOSED PROPOSED TOTAL OUTCROPPING OPEN BRUSH WALKS FEATURE AREA RESIDENTIAL - LD RESIDENTIAL - MD RESIDENTIAL - HD OPEN SPACE RI=93 RI=76 RI=56 RI=56 RI=56 RI=56 RI=56 RI=56 RI=56 acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres) DA-A 35.652 35.233 2.082 18.699 5.752 0.000 0.000 8.141 57.186 162.745 DA-B 0.000 0.000 2.581 6.423 1.483 20.347 0.000 0.000 10.752 41.586 DA-C 0.000 0.000 1.455 0.000 0.000 0.000 4.092 2.159 2.485 10.191 DA-D 0.000 0.000 2.588 2.323 4.803 0.000 0.000 7.637 11.052 28.403 DA-E 0.000 0.000 1.707 0.000 0.000 48.170 0.000 4.271 7.654 61.802 SUBTOTAL 35.652 35.233 10.413 27.445 12.038 68.517 4.092 22.208 89.129 304.727 FUTURE BNDY - F 0.000 0.000 0.353 0.000 0.000 42.760 0.000 0.000 1.698 44.811 FUTURE BNDY - G 0.000 0.000 0.316 0.000 0.000 33.880 0.000 0.000 1.546 35.742 FUTURE BNDY - H 0.000 0.000 0.000 0.000 7.118 0.000 0.000 0.000 0.000 7.118 FUTURE BNDY - I 0.000 0.000 0.470 0.000 0.000 47.890 0.000 0.000 3.269 51.629 TOTAL ON-SITE 35.652 35.233 11.552 27.445 19.156 193.047 4.092 22.208 95.642 444.027 OFF-SITE NORTH 0.000 0.000 5.754 0.000 0.000 0.000 0.000 0.000 5.950 11.704 OFF-SITE SOUTH 0.000 0.000 4.014 0.000 0.000 0.000 0.000 0.000 1.687 5.701 TOTAL OFF-SITE 0.000 0.000 9.768 0.000 0.000 0.000 0.000 0.000 7.637 17.405 TOTAL HYDROLOGIC AREA 35.652 35.233 21.320 27.445 19.156 193.047 4.092 22.208 103.279 461.432 AREA RECONCILIATION MEASURED AREAS: ROCK OUTCROPPING 35.652 EXIST OPEN BRUSH 35.233 STREETS/WALKS 21.320 WATER FEATURE 27.445 COMMERCIAL 19.156 LOTS - LOW DENSITY 193.047 LOTS - MED DENSITY 4.092 LOTS - HIGH DENSITY 22.208 OPEN SPACE 103.279 TOTAL HYDROLOGIC AREA 461.432 SURVEY BOUNDARY 384.389 ADD:77.080 SUBTRACT:0.037 TOTAL AREA:461.432 TTM 37815 - CORAL MOUNTAIN March 30, 2020 PROPOSED LAND USE PROPOSED LAND USE AREAS - SYNTHETIC UNIT MSA JOB #2553 HYDROLOGIC SOIL GROUP B DRAINAGE AREA ROCK EXIST STREETS WATER COMMERCIAL PROPOSED PROPOSED PROPOSED PROPOSED TOTAL OUTCROPPING OPEN BRUSH WALKS FEATURE AREA RESIDENTIAL - LD RESIDENTIAL - MD RESIDENTIAL - HD OPEN SPACE RI=93 RI=76 RI=56 RI=56 RI=56 RI=56 RI=56 RI=56 RI=56 acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres) DA-A1 34.384 30.363 0.000 0.000 0.000 0.000 0.000 0.000 23.665 88.412 DA-A2 0.000 0.000 2.071 0.000 5.752 0.000 0.000 8.141 1.350 17.314 DA-A3 1.268 4.870 0.011 0.000 0.000 0.000 0.000 0.000 18.819 24.968 DA-A4 0.000 0.000 0.000 18.699 0.000 0.000 0.000 0.000 13.352 32.051 TOTAL - DA-A 35.652 35.233 2.082 18.699 5.752 0.000 0.000 8.141 57.186 162.745 TTM 37815 - CORAL MOUNTAIN PROPOSED LAND USE AREAS - SYNTHETIC UNIT March 30, 2020 PROPOSED LAND USE MSA JOB #2553 HYDROLOGIC SOIL GROUP A DRAINAGE AREA ROCK EXISTING STREETS WATER COMMERCIAL RESIDENTIAL RESIDENTIAL RESIDENTIAL OPEN TOTAL IMPERVIOUS OUT-CROPPING OPEN BRUCH WALKS FEATURES LOW DENSITY MEDIUM DENSITY HIGH DENSITY SPACE AREA Ai=5%Ai=5%Ai=100%Ai=100%Ai=90%Ai=30%Ai=40%Ai=50%Ai=10% acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres)(acres) DA-A 35.652 35.233 2.082 18.699 5.752 0.000 0.000 8.141 57.186 162.745 39.291 DA-B 0.000 0.000 2.581 6.423 1.483 20.347 0.000 0.000 10.752 41.586 17.518 DA-C 0.000 0.000 1.455 0.000 0.000 0.000 4.092 2.159 2.485 10.191 4.420 DA-D 0.000 0.000 2.588 2.323 4.803 0.000 0.000 7.637 11.052 28.403 14.157 DA-E 0.000 0.000 1.707 0.000 0.000 48.170 0.000 4.271 7.654 61.802 19.059 SUBTOTAL 35.652 35.233 10.413 27.445 12.038 68.517 4.092 22.208 89.129 304.727 94.445 DA-F 0.000 0.000 0.353 0.000 0.000 42.760 0.000 0.000 1.698 44.811 13.351 DA-G 0.000 0.000 0.316 0.000 0.000 33.880 0.000 0.000 1.546 35.742 10.635 DA-H 0.000 0.000 0.000 0.000 7.118 0.000 0.000 0.000 0.000 7.118 6.406 DA-I 0.000 0.000 0.470 0.000 0.000 47.890 0.000 0.000 3.269 51.629 15.164 TOTAL ON-SITE 35.652 35.233 11.552 27.445 19.156 193.047 4.092 22.208 95.642 444.027 140.001 OFF-SITE NORTH 0.000 0.000 5.754 0.000 0.000 0.000 0.000 0.000 5.950 11.704 6.349 TTM 37815 - CORAL MOUNTAIN WQMP LAND USE - IMPERVIOUS AREAS March 30, 2020 LAND USE Coral Mountain Preliminary Hydrology Report Appendix F RCFCD Synthetic Unit Hydrograph Worksheets DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 11 D EXISTING BARREN 35.652 X 93 0.09 0.05 12 B EXISTING OPEN BRUSH - POOR 35.233 X 76 0.29 0.05 2 B PAVING/HARDSCAPE 2.082 D 56 0.51 1.00 3 B WATER FEATURE 18.699 D 56 0.51 1.00 1 B COMMERCIAL 5.752 D 56 0.51 0.90 6 B SF - HIGH DENSITY 8.141 D 56 0.51 0.50 9 B LANDSCAPING 57.186 D 56 0.51 0.10 1,180 ft 590 ft 960.0 ft ELEVATION OF CONCENTRATION POINT 456.0 ft 0.03 100 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in BASIN CHARACTERISTICS:ELEVATION AREA 451.0 ft 548,486 sf 456.0 ft 726,985 sf PERCOLATION RATE (in/hr)0.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention DA-A RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 WAVE LAGOON AMC NUMBER Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)850,704 1,264,241 1,630,516 2,605,281 SOIL LOSSES (cu-ft)157,045 464,495 840,545 1,801,551 EFFECTIVE RAIN (in)1.17 1.35 1.34 1.36 FLOOD VOLUME (cu-ft)693,659 799,746 789,971 803,730 acre-ft)15.92 18.36 18.14 18.45 REQUIRED STORAGE (cu-ft)693,659 799,746 789,971 803,730 acre-ft)15.92 18.36 18.14 18.45 FACTOR OF SAFETY 4.58 3.97 4.02 3.95 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 301.94 260.74 60.87 MAXIMUM WSEL (ft)452.09 452.26 452.24 452.26 DEPTH (ft)1.09 1.26 1.24 1.26 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 18] 200% OF LAG-MINUTES RAINFALL DATA 4.9 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. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 3,178,217 72.96 0.03 17] 100% OF LAG-MINUTES 2.5 2.5 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.04 16] LAG TIME-MINUTES 13] L*LCA/S^0.5 47.49 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.001 590.00 12] S^0.5 0.112 2255.2 960 456 504 3] AREA - ACRES 4] L-FEET 5] L-MILES 1180 0.223 WAVE LAGOON DA-A CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 162.745 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] D 93 0.09 5%0.09 35.652 0.219 0.0188 UNDEVELOPED 0.9000 0.1972 B 76 0.29 5%0.28 35.233 0.216 0.0600 UNDEVELOPED 0.9000 0.1948 B 56 0.51 100%0.05 2.082 0.013 0.0007 DEVELOPED 0.1000 0.0013 B 56 0.51 100%0.05 18.699 0.115 0.0059 DEVELOPED 0.1000 0.0115 B 56 0.51 90%0.10 5.752 0.035 0.0034 DEVELOPED 0.1800 0.0064 B 56 0.51 50%0.28 8.141 0.050 0.0140 DEVELOPED 0.5000 0.0250 B 56 0.51 10%0.46 57.186 0.351 0.1631 DEVELOPED 0.8200 0.2881 SUM 162.745 SUM 0.2658 0.7243 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.132916039 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00246 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00246 0.13 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.2658 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. COMMERCIAL SF - HIGH DENSITY LANDSCAPING 24-(T/60))^1.55 + LAND USE EXISTING BARREN EXISTING OPEN BRUSH - POOR PAVING/HARDSCAPE WATER FEATURE AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 162.75 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.45 Maxwell Drywells UNIT TIME-PERCENT OF LAG 204.0 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.44 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.27 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.62 0.27 0.53 0.36 58.46 17,538 17,538 549,471 0 0 17,538 0.40 451.03 2 10 0.17 4.2 0.73 0.27 0.62 0.46 75.48 22,643 40,181 550,743 0 0 40,181 0.92 451.06 3 15 0.25 4.4 0.76 0.27 0.65 0.49 81.15 24,344 64,525 552,110 0 0 64,525 1.48 451.10 4 20 0.33 4.6 0.79 0.27 0.68 0.53 86.82 26,045 90,570 553,573 0 0 90,570 2.08 451.14 5 25 0.42 5.0 0.86 0.27 0.73 0.60 98.16 29,448 120,018 555,227 0 0 120,018 2.76 451.19 6 30 0.50 5.6 0.97 0.27 0.82 0.70 115.17 34,552 154,571 557,167 0 0 154,571 3.55 451.24 7 35 0.58 6.4 1.11 0.27 0.94 0.84 137.86 41,358 195,929 559,490 0 0 195,929 4.50 451.31 8 40 0.67 8.1 1.40 0.27 1.19 1.13 186.07 55,820 251,748 562,625 0 0 251,748 5.78 451.40 9 45 0.75 13.1 2.26 0.27 1.92 2.00 327.85 98,355 350,104 568,149 0 0 350,104 8.04 451.55 10 50 0.83 34.5 5.96 0.27 5.07 5.70 934.69 280,406 630,509 583,897 0 0 630,509 14.47 451.99 11 55 0.92 6.7 1.16 0.27 0.98 0.89 146.37 43,910 674,420 586,364 0 0 674,420 15.48 452.06 12 60 1.00 3.8 0.66 0.27 0.56 0.39 64.13 19,240 693,659 587,444 0 0 693,659 15.92 452.09 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 850,704 cu-ft SOIL LOSSES 157,045 cu-ft EFFECTIVE RAIN 1.17 in FLOOD VOLUME 15.92 acft FLOOD VOLUME 693,659 cu-ft REQUIRED STORAGE 15.92 REQUIRED STORAGE 693,659 cu-ft MAX WSEL 452.09 ft PEAK FLOW RATE 934.69 cfs TOTAL BASIN LOSSES 0 cu-ft AVERAGE PERCOLATION RATE 0.00 cf/min EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 162.75 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.45 Maxwell Drywells UNIT TIME-PERCENT OF LAG 204.0 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.27 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.33 0.27 0.28 0.07 11.16 3,348 3,348 548,674 0 0 3,348 0.08 451.01 2 10 0.17 1.3 0.33 0.27 0.28 0.07 11.16 3,348 6,696 548,862 0 0 6,696 0.15 451.01 3 15 0.25 1.1 0.28 0.27 0.24 0.02 2.73 820 7,516 548,908 0 0 7,516 0.17 451.01 4 20 0.33 1.5 0.39 0.27 0.33 0.12 19.59 5,877 13,392 549,238 0 0 13,392 0.31 451.02 5 25 0.42 1.5 0.39 0.27 0.33 0.12 19.59 5,877 19,269 549,568 0 0 19,269 0.44 451.03 6 30 0.50 1.8 0.46 0.27 0.39 0.20 32.23 9,669 28,938 550,111 0 0 28,938 0.66 451.05 7 35 0.58 1.5 0.39 0.27 0.33 0.12 19.59 5,877 34,815 550,441 0 0 34,815 0.80 451.05 8 40 0.67 1.8 0.46 0.27 0.39 0.20 32.23 9,669 44,484 550,984 0 0 44,484 1.02 451.07 9 45 0.75 1.8 0.46 0.27 0.39 0.20 32.23 9,669 54,153 551,527 0 0 54,153 1.24 451.09 10 50 0.83 1.5 0.39 0.27 0.33 0.12 19.59 5,877 60,030 551,857 0 0 60,030 1.38 451.09 11 55 0.92 1.6 0.41 0.27 0.35 0.15 23.80 7,141 67,171 552,259 0 0 67,171 1.54 451.11 12 60 1.00 1.8 0.46 0.27 0.39 0.20 32.23 9,669 76,840 552,802 0 0 76,840 1.76 451.12 13 65 1.08 2.2 0.56 0.27 0.48 0.30 49.09 14,726 91,566 553,629 0 0 91,566 2.10 451.14 14 70 1.17 2.2 0.56 0.27 0.48 0.30 49.09 14,726 106,292 554,456 0 0 106,292 2.44 451.17 15 75 1.25 2.2 0.56 0.27 0.48 0.30 49.09 14,726 121,018 555,283 0 0 121,018 2.78 451.19 16 80 1.33 2.0 0.51 0.27 0.44 0.25 40.66 12,198 133,216 555,968 0 0 133,216 3.06 451.21 17 85 1.42 2.6 0.67 0.27 0.57 0.40 65.94 19,783 152,999 557,079 0 0 152,999 3.51 451.24 18 90 1.50 2.7 0.69 0.27 0.59 0.43 70.16 21,047 174,047 558,261 0 0 174,047 4.00 451.27 19 95 1.58 2.4 0.62 0.27 0.52 0.35 57.52 17,255 191,302 559,230 0 0 191,302 4.39 451.30 20 100 1.67 2.7 0.69 0.27 0.59 0.43 70.16 21,047 212,349 560,412 0 0 212,349 4.87 451.33 21 105 1.75 3.3 0.85 0.27 0.72 0.58 95.44 28,633 240,982 562,020 0 0 240,982 5.53 451.38 22 110 1.83 3.1 0.80 0.27 0.68 0.53 87.01 26,104 267,086 563,486 0 0 267,086 6.13 451.42 23 115 1.92 2.9 0.74 0.27 0.63 0.48 78.59 23,576 290,662 564,811 0 0 290,662 6.67 451.46 24 120 2.00 3.0 0.77 0.27 0.65 0.50 82.80 24,840 315,502 566,206 0 0 315,502 7.24 451.50 25 125 2.08 3.1 0.80 0.27 0.68 0.53 87.01 26,104 341,607 567,672 0 0 341,607 7.84 451.54 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 162.75 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.45 Maxwell Drywells UNIT TIME-PERCENT OF LAG 204.0 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.27 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses 26 130 2.17 4.2 1.08 0.27 0.92 0.81 133.37 40,011 381,618 569,919 0 0 381,618 8.76 451.60 27 135 2.25 5.0 1.28 0.27 1.09 1.02 167.08 50,125 431,743 572,734 0 0 431,743 9.91 451.68 28 140 2.33 3.5 0.90 0.27 0.76 0.63 103.87 31,161 462,904 574,484 0 0 462,904 10.63 451.73 29 145 2.42 6.8 1.75 0.27 1.48 1.48 242.94 72,881 535,785 578,577 0 0 535,785 12.30 451.84 30 150 2.50 7.3 1.87 0.27 1.59 1.61 264.01 79,203 614,988 583,026 0 0 614,988 14.12 451.97 31 155 2.58 8.2 2.11 0.27 1.79 1.84 301.94 90,581 705,569 588,113 0 0 705,569 16.20 452.11 32 160 2.67 5.9 1.52 0.27 1.29 1.25 205.01 61,503 767,072 591,567 0 0 767,072 17.61 452.21 33 165 2.75 2.0 0.51 0.27 0.44 0.25 40.66 12,198 779,270 592,252 0 0 779,270 17.89 452.23 34 170 2.83 1.8 0.46 0.27 0.39 0.20 32.23 9,669 788,939 592,795 0 0 788,939 18.11 452.24 35 175 2.92 1.8 0.46 0.27 0.39 0.20 32.23 9,669 798,608 593,338 0 0 798,608 18.33 452.26 36 180 3.00 0.6 0.15 0.27 0.13 0.02 3.79 1,138 799,746 593,402 0 0 799,746 18.36 452.26 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 0 cu-ft 0.00 cf/min 1.35 in 18.36 acft 799,746 cu-ft 18.36 acft 799,746 cu-ft 464,495 cu-ft 2.14 in 1,264,241 cu-ft 452.26 ft 301.94 cfs Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 162.75 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.45 Maxwell Drywells UNIT TIME-PERCENT OF LAG 204.0 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.27 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.17 0.27 0.14 0.02 4.08 1,223 1,223 548,555 0 0 1,223 0.03 451.00 2 10 0.17 0.6 0.20 0.27 0.17 0.03 4.89 1,467 2,690 548,637 0 0 2,690 0.06 451.00 3 15 0.25 0.6 0.20 0.27 0.17 0.03 4.89 1,467 4,158 548,720 0 0 4,158 0.10 451.01 4 20 0.33 0.6 0.20 0.27 0.17 0.03 4.89 1,467 5,625 548,802 0 0 5,625 0.13 451.01 5 25 0.42 0.6 0.20 0.27 0.17 0.03 4.89 1,467 7,093 548,884 0 0 7,093 0.16 451.01 6 30 0.50 0.7 0.23 0.27 0.20 0.03 5.71 1,712 8,805 548,981 0 0 8,805 0.20 451.01 7 35 0.58 0.7 0.23 0.27 0.20 0.03 5.71 1,712 10,517 549,077 0 0 10,517 0.24 451.02 8 40 0.67 0.7 0.23 0.27 0.20 0.03 5.71 1,712 12,229 549,173 0 0 12,229 0.28 451.02 9 45 0.75 0.7 0.23 0.27 0.20 0.03 5.71 1,712 13,941 549,269 0 0 13,941 0.32 451.02 10 50 0.83 0.7 0.23 0.27 0.20 0.03 5.71 1,712 15,653 549,365 0 0 15,653 0.36 451.02 11 55 0.92 0.7 0.23 0.27 0.20 0.03 5.71 1,712 17,365 549,461 0 0 17,365 0.40 451.03 12 60 1.00 0.8 0.26 0.27 0.23 0.04 6.52 1,957 19,322 549,571 0 0 19,322 0.44 451.03 13 65 1.08 0.8 0.26 0.27 0.23 0.04 6.52 1,957 21,278 549,681 0 0 21,278 0.49 451.03 14 70 1.17 0.8 0.26 0.27 0.23 0.04 6.52 1,957 23,235 549,791 0 0 23,235 0.53 451.04 15 75 1.25 0.8 0.26 0.27 0.23 0.04 6.52 1,957 25,191 549,901 0 0 25,191 0.58 451.04 16 80 1.33 0.8 0.26 0.27 0.23 0.04 6.52 1,957 27,148 550,011 0 0 27,148 0.62 451.04 17 85 1.42 0.8 0.26 0.27 0.23 0.04 6.52 1,957 29,105 550,121 0 0 29,105 0.67 451.05 18 90 1.50 0.8 0.26 0.27 0.23 0.04 6.52 1,957 31,061 550,231 0 0 31,061 0.71 451.05 19 95 1.58 0.8 0.26 0.27 0.23 0.04 6.52 1,957 33,018 550,340 0 0 33,018 0.76 451.05 20 100 1.67 0.8 0.26 0.27 0.23 0.04 6.52 1,957 34,975 550,450 0 0 34,975 0.80 451.06 21 105 1.75 0.8 0.26 0.27 0.23 0.04 6.52 1,957 36,931 550,560 0 0 36,931 0.85 451.06 22 110 1.83 0.8 0.26 0.27 0.23 0.04 6.52 1,957 38,888 550,670 0 0 38,888 0.89 451.06 23 115 1.92 0.8 0.26 0.27 0.23 0.04 6.52 1,957 40,844 550,780 0 0 40,844 0.94 451.06 24 120 2.00 0.9 0.30 0.27 0.25 0.03 5.29 1,588 42,432 550,869 0 0 42,432 0.97 451.07 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 162.75 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.45 Maxwell Drywells UNIT TIME-PERCENT OF LAG 204.0 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.27 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.26 0.27 0.23 0.04 6.52 1,957 44,389 550,979 0 0 44,389 1.02 451.07 26 130 2.17 0.9 0.30 0.27 0.25 0.03 5.29 1,588 45,976 551,068 0 0 45,976 1.06 451.07 27 135 2.25 0.9 0.30 0.27 0.25 0.03 5.29 1,588 47,564 551,157 0 0 47,564 1.09 451.07 28 140 2.33 0.9 0.30 0.27 0.25 0.03 5.29 1,588 49,151 551,247 0 0 49,151 1.13 451.08 29 145 2.42 0.9 0.30 0.27 0.25 0.03 5.29 1,588 50,739 551,336 0 0 50,739 1.16 451.08 30 150 2.50 0.9 0.30 0.27 0.25 0.03 5.29 1,588 52,327 551,425 0 0 52,327 1.20 451.08 31 155 2.58 0.9 0.30 0.27 0.25 0.03 5.29 1,588 53,914 551,514 0 0 53,914 1.24 451.08 32 160 2.67 0.9 0.30 0.27 0.25 0.03 5.29 1,588 55,502 551,603 0 0 55,502 1.27 451.09 33 165 2.75 1.0 0.33 0.27 0.28 0.07 10.73 3,218 58,720 551,784 0 0 58,720 1.35 451.09 34 170 2.83 1.0 0.33 0.27 0.28 0.07 10.73 3,218 61,938 551,965 0 0 61,938 1.42 451.10 35 175 2.92 1.0 0.33 0.27 0.28 0.07 10.73 3,218 65,156 552,145 0 0 65,156 1.50 451.10 36 180 3.00 1.0 0.33 0.27 0.28 0.07 10.73 3,218 68,374 552,326 0 0 68,374 1.57 451.11 37 185 3.08 1.0 0.33 0.27 0.28 0.07 10.73 3,218 71,592 552,507 0 0 71,592 1.64 451.11 38 190 3.17 1.1 0.36 0.27 0.31 0.10 16.16 4,849 76,441 552,779 0 0 76,441 1.75 451.12 39 195 3.25 1.1 0.36 0.27 0.31 0.10 16.16 4,849 81,289 553,051 0 0 81,289 1.87 451.13 40 200 3.33 1.1 0.36 0.27 0.31 0.10 16.16 4,849 86,138 553,324 0 0 86,138 1.98 451.14 41 205 3.42 1.2 0.40 0.27 0.34 0.13 21.60 6,479 92,617 553,688 0 0 92,617 2.13 451.15 42 210 3.50 1.3 0.43 0.27 0.37 0.16 27.03 8,110 100,727 554,143 0 0 100,727 2.31 451.16 43 215 3.58 1.4 0.46 0.27 0.39 0.20 32.47 9,740 110,467 554,690 0 0 110,467 2.54 451.17 44 220 3.67 1.4 0.46 0.27 0.39 0.20 32.47 9,740 120,207 555,237 0 0 120,207 2.76 451.19 45 225 3.75 1.5 0.50 0.27 0.42 0.23 37.90 11,371 131,578 555,876 0 0 131,578 3.02 451.21 46 230 3.83 1.5 0.50 0.27 0.42 0.23 37.90 11,371 142,949 556,514 0 0 142,949 3.28 451.22 47 235 3.92 1.6 0.53 0.27 0.45 0.26 43.34 13,001 155,950 557,245 0 0 155,950 3.58 451.25 48 240 4.00 1.6 0.53 0.27 0.45 0.26 43.34 13,001 168,951 557,975 0 0 168,951 3.88 451.27 49 245 4.08 1.7 0.56 0.27 0.48 0.30 48.77 14,632 183,583 558,797 0 0 183,583 4.21 451.29 50 250 4.17 1.8 0.60 0.27 0.51 0.33 54.21 16,262 199,845 559,710 0 0 199,845 4.59 451.31 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 162.75 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.45 Maxwell Drywells UNIT TIME-PERCENT OF LAG 204.0 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.27 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.63 0.27 0.53 0.36 59.64 17,893 217,738 560,715 0 0 217,738 5.00 451.34 52 260 4.33 2.0 0.66 0.27 0.56 0.40 65.08 19,523 237,261 561,811 0 0 237,261 5.45 451.37 53 265 4.42 2.1 0.70 0.27 0.59 0.43 70.51 21,154 258,415 562,999 0 0 258,415 5.93 451.41 54 270 4.50 2.1 0.70 0.27 0.59 0.43 70.51 21,154 279,568 564,187 0 0 279,568 6.42 451.44 55 275 4.58 2.2 0.73 0.27 0.62 0.46 75.95 22,784 302,353 565,467 0 0 302,353 6.94 451.48 56 280 4.67 2.3 0.76 0.27 0.65 0.50 81.38 24,415 326,767 566,838 0 0 326,767 7.50 451.51 57 285 4.75 2.4 0.79 0.27 0.68 0.53 86.82 26,045 352,813 568,301 0 0 352,813 8.10 451.56 58 290 4.83 2.4 0.79 0.27 0.68 0.53 86.82 26,045 378,858 569,764 0 0 378,858 8.70 451.60 59 295 4.92 2.5 0.83 0.27 0.70 0.56 92.25 27,676 406,534 571,318 0 0 406,534 9.33 451.64 60 300 5.00 2.6 0.86 0.27 0.73 0.60 97.69 29,306 435,840 572,964 0 0 435,840 10.01 451.69 61 305 5.08 3.1 1.03 0.27 0.87 0.76 124.86 37,459 473,299 575,068 0 0 473,299 10.87 451.74 62 310 5.17 3.6 1.19 0.27 1.01 0.93 152.04 45,612 518,911 577,630 0 0 518,911 11.91 451.82 63 315 5.25 3.9 1.29 0.27 1.10 1.03 168.34 50,503 569,414 580,466 0 0 569,414 13.07 451.90 64 320 5.33 4.2 1.39 0.27 1.18 1.13 184.65 55,395 624,808 583,577 0 0 624,808 14.34 451.98 65 325 5.42 4.7 1.56 0.27 1.32 1.29 211.82 63,547 688,356 587,146 0 0 688,356 15.80 452.08 66 330 5.50 5.6 1.85 0.27 1.58 1.59 260.74 78,222 766,577 591,539 0 0 766,577 17.60 452.21 67 335 5.58 1.9 0.63 0.27 0.53 0.36 59.64 17,893 784,470 592,544 0 0 784,470 18.01 452.23 68 340 5.67 0.9 0.30 0.27 0.25 0.03 5.29 1,588 786,058 592,634 0 0 786,058 18.05 452.24 69 345 5.75 0.6 0.20 0.27 0.17 0.03 4.89 1,467 787,525 592,716 0 0 787,525 18.08 452.24 70 350 5.83 0.5 0.17 0.27 0.14 0.02 4.08 1,223 788,748 592,785 0 0 788,748 18.11 452.24 71 355 5.92 0.3 0.10 0.27 0.08 0.01 2.45 734 789,482 592,826 0 0 789,482 18.12 452.24 72 360 6.00 0.2 0.07 0.27 0.06 0.01 1.63 489 789,971 592,853 0 0 789,971 18.14 452.24 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 0.00 cf/min 0 cu-ft 1.34 in 18.14 acft 789,971 cu-ft 18.14 acft 789,971 cu-ft 1,630,516 cu-ft 2.76 in 840,545 cu-ft 452.24 ft 260.74 cfs Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 162.75 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 2.45 C 0.00246 Maxwell Drywells UNIT TIME-PERCENT OF LAG 612%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.035 0.469 0.030 0.01 0.87 782 782 548,530 0 0 782 0.02 451.00 2 30 0.50 0.3 0.053 0.464 0.045 0.01 1.30 1,172 1,954 548,596 0 0 1,954 0.04 451.00 3 45 0.75 0.3 0.053 0.459 0.045 0.01 1.30 1,172 3,126 548,662 0 0 3,126 0.07 451.00 4 60 1.00 0.4 0.071 0.453 0.060 0.01 1.74 1,563 4,690 548,749 0 0 4,690 0.11 451.01 5 75 1.25 0.3 0.053 0.448 0.045 0.01 1.30 1,172 5,862 548,815 0 0 5,862 0.13 451.01 6 90 1.50 0.3 0.053 0.443 0.045 0.01 1.30 1,172 7,034 548,881 0 0 7,034 0.16 451.01 7 105 1.75 0.3 0.053 0.437 0.045 0.01 1.30 1,172 8,207 548,947 0 0 8,207 0.19 451.01 8 120 2.00 0.4 0.071 0.432 0.060 0.01 1.74 1,563 9,770 549,035 0 0 9,770 0.22 451.02 9 135 2.25 0.4 0.071 0.427 0.060 0.01 1.74 1,563 11,333 549,122 0 0 11,333 0.26 451.02 10 150 2.50 0.4 0.071 0.422 0.060 0.01 1.74 1,563 12,896 549,210 0 0 12,896 0.30 451.02 11 165 2.75 0.5 0.088 0.416 0.075 0.01 2.17 1,954 14,850 549,320 0 0 14,850 0.34 451.02 12 180 3.00 0.5 0.088 0.411 0.075 0.01 2.17 1,954 16,804 549,430 0 0 16,804 0.39 451.03 13 195 3.25 0.5 0.088 0.406 0.075 0.01 2.17 1,954 18,758 549,540 0 0 18,758 0.43 451.03 14 210 3.50 0.5 0.088 0.401 0.075 0.01 2.17 1,954 20,712 549,649 0 0 20,712 0.48 451.03 15 225 3.75 0.5 0.088 0.396 0.075 0.01 2.17 1,954 22,666 549,759 0 0 22,666 0.52 451.04 16 240 4.00 0.6 0.106 0.391 0.090 0.02 2.61 2,345 25,011 549,891 0 0 25,011 0.57 451.04 17 255 4.25 0.6 0.106 0.386 0.090 0.02 2.61 2,345 27,355 550,022 0 0 27,355 0.63 451.04 18 270 4.50 0.7 0.123 0.381 0.105 0.02 3.04 2,736 30,091 550,176 0 0 30,091 0.69 451.05 19 285 4.75 0.7 0.123 0.376 0.105 0.02 3.04 2,736 32,827 550,330 0 0 32,827 0.75 451.05 20 300 5.00 0.8 0.141 0.372 0.120 0.02 3.47 3,126 35,953 550,505 0 0 35,953 0.83 451.06 21 315 5.25 0.6 0.106 0.367 0.090 0.02 2.61 2,345 38,298 550,637 0 0 38,298 0.88 451.06 22 330 5.50 0.7 0.123 0.362 0.105 0.02 3.04 2,736 41,033 550,791 0 0 41,033 0.94 451.06 23 345 5.75 0.8 0.141 0.357 0.120 0.02 3.47 3,126 44,160 550,966 0 0 44,160 1.01 451.07 24 360 6.00 0.8 0.141 0.352 0.120 0.02 3.47 3,126 47,286 551,142 0 0 47,286 1.09 451.07 25 375 6.25 0.9 0.159 0.348 0.135 0.02 3.91 3,517 50,803 551,339 0 0 50,803 1.17 451.08 26 390 6.50 0.9 0.159 0.343 0.135 0.02 3.91 3,517 54,320 551,537 0 0 54,320 1.25 451.09 27 405 6.75 1.0 0.176 0.339 0.150 0.03 4.34 3,908 58,228 551,756 0 0 58,228 1.34 451.09 28 420 7.00 1.0 0.176 0.334 0.150 0.03 4.34 3,908 62,136 551,976 0 0 62,136 1.43 451.10 29 435 7.25 1.0 0.176 0.329 0.150 0.03 4.34 3,908 66,044 552,195 0 0 66,044 1.52 451.10 30 450 7.50 1.1 0.194 0.325 0.165 0.03 4.78 4,299 70,343 552,437 0 0 70,343 1.61 451.11 31 465 7.75 1.2 0.212 0.320 0.180 0.03 5.21 4,690 75,032 552,700 0 0 75,032 1.72 451.12 32 480 8.00 1.3 0.229 0.316 0.195 0.03 5.64 5,080 80,112 552,985 0 0 80,112 1.84 451.13 33 495 8.25 1.5 0.265 0.312 0.225 0.04 6.51 5,862 85,974 553,315 0 0 85,974 1.97 451.14 34 510 8.50 1.5 0.265 0.307 0.225 0.04 6.51 5,862 91,836 553,644 0 0 91,836 2.11 451.14 35 525 8.75 1.6 0.282 0.303 0.240 0.04 6.95 6,253 98,089 553,995 0 0 98,089 2.25 451.15 36 540 9.00 1.7 0.300 0.299 0.255 0.00 0.18 165 98,254 554,004 0 0 98,254 2.26 451.15 37 555 9.25 1.9 0.335 0.295 0.285 0.04 6.67 6,000 104,254 554,341 0 0 104,254 2.39 451.16 38 570 9.50 2.0 0.353 0.290 0.300 0.06 10.25 9,224 113,478 554,859 0 0 113,478 2.61 451.18 39 585 9.75 2.1 0.370 0.286 0.315 0.08 13.83 12,443 125,920 555,558 0 0 125,920 2.89 451.20 40 600 10.00 2.2 0.388 0.282 0.330 0.11 17.39 15,655 141,576 556,437 0 0 141,576 3.25 451.22 41 615 10.25 1.5 0.265 0.278 0.225 0.04 6.51 5,862 147,438 556,767 0 0 147,438 3.38 451.23 42 630 10.50 1.5 0.265 0.274 0.225 0.04 6.51 5,862 153,299 557,096 0 0 153,299 3.52 451.24 43 645 10.75 2.0 0.353 0.270 0.300 0.08 13.59 12,231 165,530 557,783 0 0 165,530 3.80 451.26 in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 162.75 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 2.45 C 0.00246 Maxwell Drywells UNIT TIME-PERCENT OF LAG 612%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 44 660 11.00 2.0 0.353 0.266 0.300 0.09 14.24 12,815 178,345 558,502 0 0 178,345 4.09 451.28 45 675 11.25 1.9 0.335 0.262 0.285 0.07 11.99 10,787 189,132 559,108 0 0 189,132 4.34 451.30 46 690 11.50 1.9 0.335 0.258 0.285 0.08 12.62 11,358 200,490 559,746 0 0 200,490 4.60 451.32 47 705 11.75 1.7 0.300 0.254 0.255 0.05 7.46 6,712 207,202 560,123 0 0 207,202 4.76 451.33 48 720 12.00 1.8 0.318 0.251 0.270 0.07 10.97 9,877 217,079 560,678 0 0 217,079 4.98 451.34 49 735 12.25 2.5 0.441 0.247 0.375 0.19 31.85 28,666 245,745 562,288 0 0 245,745 5.64 451.39 50 750 12.50 2.6 0.459 0.243 0.390 0.22 35.35 31,818 277,562 564,075 0 0 277,562 6.37 451.44 51 765 12.75 2.8 0.494 0.240 0.420 0.25 41.74 37,568 315,130 566,185 0 0 315,130 7.23 451.50 52 780 13.00 2.9 0.512 0.236 0.435 0.28 45.23 40,706 355,837 568,471 0 0 355,837 8.17 451.56 53 795 13.25 3.4 0.600 0.232 0.510 0.37 60.29 54,260 410,096 571,518 0 0 410,096 9.41 451.65 54 810 13.50 3.4 0.600 0.229 0.510 0.37 60.87 54,780 464,876 574,595 0 0 464,876 10.67 451.73 55 825 13.75 2.3 0.406 0.225 0.345 0.18 29.59 26,635 491,511 576,091 0 0 491,511 11.28 451.77 56 840 14.00 2.3 0.406 0.222 0.345 0.18 30.16 27,142 518,652 577,615 0 0 518,652 11.91 451.82 57 855 14.25 2.7 0.476 0.219 0.405 0.26 42.29 38,063 556,715 579,753 0 0 556,715 12.78 451.88 58 870 14.50 2.6 0.459 0.215 0.390 0.24 39.94 35,950 592,665 581,772 0 0 592,665 13.61 451.93 59 885 14.75 2.6 0.459 0.212 0.390 0.25 40.48 36,436 629,101 583,818 0 0 629,101 14.44 451.99 60 900 15.00 2.5 0.441 0.209 0.375 0.23 38.12 34,310 663,411 585,745 0 0 663,411 15.23 452.04 61 915 15.25 2.4 0.423 0.206 0.360 0.22 35.75 32,176 695,587 587,552 0 0 695,587 15.97 452.09 62 930 15.50 2.3 0.406 0.202 0.345 0.20 33.37 30,035 725,622 589,239 0 0 725,622 16.66 452.14 63 945 15.75 1.9 0.335 0.199 0.285 0.14 22.30 20,071 745,693 590,367 0 0 745,693 17.12 452.17 64 960 16.00 1.9 0.335 0.196 0.285 0.14 22.80 20,521 766,214 591,519 0 0 766,214 17.59 452.21 65 975 16.25 0.4 0.071 0.193 0.060 0.01 1.74 1,563 767,777 591,607 0 0 767,777 17.63 452.21 66 990 16.50 0.4 0.071 0.190 0.060 0.01 1.74 1,563 769,340 591,695 0 0 769,340 17.66 452.21 67 1005 16.75 0.3 0.053 0.187 0.045 0.01 1.30 1,172 770,512 591,760 0 0 770,512 17.69 452.21 68 1020 17.00 0.3 0.053 0.185 0.045 0.01 1.30 1,172 771,685 591,826 0 0 771,685 17.72 452.21 69 1035 17.25 0.5 0.088 0.182 0.075 0.01 2.17 1,954 773,639 591,936 0 0 773,639 17.76 452.22 70 1050 17.50 0.5 0.088 0.179 0.075 0.01 2.17 1,954 775,593 592,046 0 0 775,593 17.81 452.22 71 1065 17.75 0.5 0.088 0.176 0.075 0.01 2.17 1,954 777,547 592,156 0 0 777,547 17.85 452.22 72 1080 18.00 0.4 0.071 0.174 0.060 0.01 1.74 1,563 779,110 592,243 0 0 779,110 17.89 452.23 73 1095 18.25 0.4 0.071 0.171 0.060 0.01 1.74 1,563 780,673 592,331 0 0 780,673 17.92 452.23 74 1110 18.50 0.4 0.071 0.169 0.060 0.01 1.74 1,563 782,236 592,419 0 0 782,236 17.96 452.23 75 1125 18.75 0.3 0.053 0.166 0.045 0.01 1.30 1,172 783,409 592,485 0 0 783,409 17.98 452.23 76 1140 19.00 0.2 0.035 0.164 0.030 0.01 0.87 782 784,190 592,529 0 0 784,190 18.00 452.23 77 1155 19.25 0.3 0.053 0.162 0.045 0.01 1.30 1,172 785,363 592,595 0 0 785,363 18.03 452.24 78 1170 19.50 0.4 0.071 0.159 0.060 0.01 1.74 1,563 786,926 592,682 0 0 786,926 18.07 452.24 79 1185 19.75 0.3 0.053 0.157 0.045 0.01 1.30 1,172 788,098 592,748 0 0 788,098 18.09 452.24 80 1200 20.00 0.2 0.035 0.155 0.030 0.01 0.87 782 788,880 592,792 0 0 788,880 18.11 452.24 81 1215 20.25 0.3 0.053 0.153 0.045 0.01 1.30 1,172 790,052 592,858 0 0 790,052 18.14 452.24 82 1230 20.50 0.3 0.053 0.151 0.045 0.01 1.30 1,172 791,224 592,924 0 0 791,224 18.16 452.24 83 1245 20.75 0.3 0.053 0.149 0.045 0.01 1.30 1,172 792,397 592,990 0 0 792,397 18.19 452.25 84 1260 21.00 0.2 0.035 0.147 0.030 0.01 0.87 782 793,178 593,033 0 0 793,178 18.21 452.25 85 1275 21.25 0.3 0.053 0.146 0.045 0.01 1.30 1,172 794,351 593,099 0 0 794,351 18.24 452.25 86 1290 21.50 0.2 0.035 0.144 0.030 0.01 0.87 782 795,132 593,143 0 0 795,132 18.25 452.25 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 162.75 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 2.45 C 0.00246 Maxwell Drywells UNIT TIME-PERCENT OF LAG 612%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 87 1305 21.75 0.3 0.053 0.142 0.045 0.01 1.30 1,172 796,305 593,209 0 0 796,305 18.28 452.25 88 1320 22.00 0.2 0.035 0.141 0.030 0.01 0.87 782 797,086 593,253 0 0 797,086 18.30 452.25 89 1335 22.25 0.3 0.053 0.139 0.045 0.01 1.30 1,172 798,259 593,319 0 0 798,259 18.33 452.26 90 1350 22.50 0.2 0.035 0.138 0.030 0.01 0.87 782 799,040 593,363 0 0 799,040 18.34 452.26 91 1365 22.75 0.2 0.035 0.137 0.030 0.01 0.87 782 799,822 593,407 0 0 799,822 18.36 452.26 92 1380 23.00 0.2 0.035 0.136 0.030 0.01 0.87 782 800,603 593,450 0 0 800,603 18.38 452.26 93 1395 23.25 0.2 0.035 0.135 0.030 0.01 0.87 782 801,385 593,494 0 0 801,385 18.40 452.26 94 1410 23.50 0.2 0.035 0.134 0.030 0.01 0.87 782 802,167 593,538 0 0 802,167 18.42 452.26 95 1425 23.75 0.2 0.035 0.133 0.030 0.01 0.87 782 802,948 593,582 0 0 802,948 18.43 452.26 96 1440 24.00 0.2 0.035 0.133 0.030 0.01 0.87 782 803,730 593,626 0 0 803,730 18.45 452.26 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 0 cu-ft 0.00 cf/min 1.36 in 18.45 acft 803,730 cu-ft 18.45 acft 803,730 cu-ft 4.41 in 2,605,281 cu-ft 1,801,551 cu-ft 452.26 ft 60.87 cfs Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL WAVE LAGOON BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 11 D EXISTING BARREN 34.384 X 93 0.09 0.05 12 B EXISTING OPEN BRUSH - POOR 30.363 X 76 0.29 0.05 2 B PAVING/HARDSCAPE 0.000 D 56 0.51 1.00 3 B WATER FEATURE 0.000 D 56 0.51 1.00 1 B COMMERCIAL 0.000 D 56 0.51 0.90 6 B SF - HIGH DENSITY 0.000 D 56 0.51 0.50 9 B LANDSCAPING 23.665 D 56 0.51 0.10 1,180 ft 590 ft 960.0 ft ELEVATION OF CONCENTRATION POINT 461.0 ft 0.03 10 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 0.71 in 3-HOUR 1.06 in 6-HOUR 1.36 in 24-HOUR 2.23 in BASIN CHARACTERISTICS:ELEVATION AREA 459.0 ft 65,765 sf 460.0 ft 77,310 sf 461.0 ft 89,480 sf PERCOLATION RATE (in/hr)1.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 10 YEAR BASIN AMC NUMBER RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention DA-A1 Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)228,186 340,193 436,474 715,689 SOIL LOSSES (cu-ft)81,121 209,809 309,926 625,214 EFFECTIVE RAIN (in)0.46 0.41 0.39 0.28 FLOOD VOLUME (cu-ft)147,065 130,384 126,548 90,475 acre-ft)3.38 2.99 2.91 2.08 REQUIRED STORAGE (cu-ft)140,938 113,286 95,565 19,645 acre-ft)3.24 2.60 2.19 0.45 FACTOR OF SAFETY 1.10 1.37 1.62 7.88 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 70.45 58.94 7.64 MAXIMUM WSEL (ft)460.83 460.50 460.29 459.27 DEPTH (ft)1.83 1.50 1.29 0.27 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days)1.0 0.9 1.0 1.0 10 YEAR BASIN DA-A1 CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 88.412 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION 3] AREA - ACRES 4] L-FEET 5] L-MILES 1180 0.223 13] L*LCA/S^0.5 47.25 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.001 590.00 12] S^0.5 0.112 2232.8 960 461 499 0.03 17] 100% OF LAG-MINUTES 2.5 2.5 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.04 16] LAG TIME-MINUTES 18] 200% OF LAG-MINUTES RAINFALL DATA 4.9 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. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 154,781 3.55 Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] D 93 0.09 5%0.09 34.384 0.389 0.0334 UNDEVELOPED 0.9000 0.3500 B 76 0.29 5%0.28 30.363 0.343 0.0951 UNDEVELOPED 0.9000 0.3091 B 56 0.51 100%0.05 0.000 0.000 0.0000 DEVELOPED 0.1000 0.0000 B 56 0.51 100%0.05 0.000 0.000 0.0000 DEVELOPED 0.1000 0.0000 B 56 0.51 90%0.10 0.000 0.000 0.0000 DEVELOPED 0.1800 0.0000 B 56 0.51 50%0.28 0.000 0.000 0.0000 DEVELOPED 0.5000 0.0000 B 56 0.51 10%0.46 23.665 0.268 0.1242 DEVELOPED 0.8200 0.2195 SUM 88.412 SUM 0.2528 0.8786 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.126381397 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00234 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00234 0.13 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.2528 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8786 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II 24-(T/60))^1.55 + LAND USE EXISTING BARREN EXISTING OPEN BRUSH - POOR PAVING/HARDSCAPE WATER FEATURE COMMERCIAL SF - HIGH DENSITY LANDSCAPING Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 88.41 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.46 Maxwell Drywells UNIT TIME-PERCENT OF LAG 203.6 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 0.71 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.25 LOW LOSS RATE - PERCENT 87.86% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.31 0.25 0.27 0.05 4.85 1,455 1,455 66,000 458 458 996 0.02 459.01 2 10 0.17 4.2 0.36 0.25 0.31 0.11 9.41 2,824 3,820 66,382 461 461 3,359 0.08 459.05 3 15 0.25 4.4 0.38 0.25 0.33 0.12 10.93 3,280 6,639 66,838 464 464 6,175 0.14 459.09 4 20 0.33 4.6 0.39 0.25 0.34 0.14 12.45 3,736 9,911 67,366 468 468 9,444 0.22 459.13 5 25 0.42 5.0 0.43 0.25 0.37 0.17 15.50 4,649 14,093 68,042 473 473 13,620 0.31 459.19 6 30 0.50 5.6 0.48 0.25 0.42 0.23 20.06 6,018 19,639 68,938 479 479 19,160 0.44 459.27 7 35 0.58 6.4 0.55 0.25 0.48 0.29 26.15 7,844 27,004 70,128 487 487 26,517 0.61 459.37 8 40 0.67 8.1 0.69 0.25 0.61 0.44 39.08 11,723 38,240 71,943 500 500 37,740 0.87 459.53 9 45 0.75 13.1 1.12 0.25 0.98 0.86 77.11 23,132 60,873 75,600 525 525 60,348 1.39 459.84 10 50 0.83 34.5 2.94 0.25 2.59 2.69 239.88 71,964 132,312 86,198 599 599 131,713 3.02 460.72 11 55 0.92 6.7 0.57 0.25 0.50 0.32 28.43 8,528 140,241 87,356 607 607 139,635 3.21 460.82 12 60 1.00 3.8 0.32 0.25 0.28 0.07 6.37 1,911 141,546 87,547 608 608 140,938 3.24 460.83 TOTAL RAINFALL 0.71 in RAINFALL VOLUME 228,186 cu-ft SOIL LOSSES 81,121 cu-ft EFFECTIVE RAIN 0.46 in FLOOD VOLUME 3.38 acft FLOOD VOLUME 147,065 cu-ft REQUIRED STORAGE 3.24 REQUIRED STORAGE 140,938 cu-ft MAX WSEL 460.83 ft PEAK FLOW RATE 239.88 cfs TOTAL BASIN LOSSES 6,127 cu-ft AVERAGE PERCOLATION RATE 102.12 cf/min CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 88.41 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.46 Maxwell Drywells UNIT TIME-PERCENT OF LAG 203.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.06 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.25 LOW LOSS RATE - PERCENT 87.86% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.17 0.25 0.15 0.02 1.79 537 537 65,852 457 457 80 0.00 459.00 2 10 0.17 1.3 0.17 0.25 0.15 0.02 1.79 537 617 65,865 457 457 159 0.00 459.00 3 15 0.25 1.1 0.14 0.25 0.12 0.02 1.51 454 614 65,864 457 457 156 0.00 459.00 4 20 0.33 1.5 0.19 0.25 0.17 0.02 2.07 620 776 65,890 458 458 318 0.01 459.00 5 25 0.42 1.5 0.19 0.25 0.17 0.02 2.07 620 938 65,916 458 458 480 0.01 459.01 6 30 0.50 1.8 0.23 0.25 0.20 0.03 2.48 743 1,223 65,963 458 458 765 0.02 459.01 7 35 0.58 1.5 0.19 0.25 0.17 0.02 2.07 620 1,385 65,989 458 458 927 0.02 459.01 8 40 0.67 1.8 0.23 0.25 0.20 0.03 2.48 743 1,670 66,035 459 459 1,212 0.03 459.02 9 45 0.75 1.8 0.23 0.25 0.20 0.03 2.48 743 1,955 66,081 459 459 1,496 0.03 459.02 10 50 0.83 1.5 0.19 0.25 0.17 0.02 2.07 620 2,116 66,107 459 459 1,657 0.04 459.02 11 55 0.92 1.6 0.20 0.25 0.18 0.02 2.20 661 2,317 66,139 459 459 1,858 0.04 459.03 12 60 1.00 1.8 0.23 0.25 0.20 0.03 2.48 743 2,602 66,185 460 460 2,142 0.05 459.03 13 65 1.08 2.2 0.28 0.25 0.25 0.03 2.41 724 2,866 66,228 460 460 2,406 0.06 459.03 14 70 1.17 2.2 0.28 0.25 0.25 0.03 2.41 724 3,130 66,271 460 460 2,670 0.06 459.04 15 75 1.25 2.2 0.28 0.25 0.25 0.03 2.41 724 3,394 66,313 461 461 2,934 0.07 459.04 16 80 1.33 2.0 0.25 0.25 0.22 0.00 0.15 44 2,978 66,246 460 460 2,518 0.06 459.04 17 85 1.42 2.6 0.33 0.25 0.29 0.08 6.95 2,085 4,603 66,509 462 462 4,141 0.10 459.06 18 90 1.50 2.7 0.34 0.25 0.30 0.09 8.08 2,425 6,566 66,826 464 464 6,102 0.14 459.09 19 95 1.58 2.4 0.31 0.25 0.27 0.05 4.68 1,405 7,506 66,978 465 465 7,041 0.16 459.10 20 100 1.67 2.7 0.34 0.25 0.30 0.09 8.08 2,425 9,466 67,294 467 467 8,999 0.21 459.13 21 105 1.75 3.3 0.42 0.25 0.37 0.17 14.89 4,466 13,465 67,940 472 472 12,994 0.30 459.18 22 110 1.83 3.1 0.39 0.25 0.35 0.14 12.62 3,786 16,779 68,476 476 476 16,304 0.37 459.23 23 115 1.92 2.9 0.37 0.25 0.32 0.12 10.35 3,106 19,409 68,901 478 478 18,931 0.43 459.26 24 120 2.00 3.0 0.38 0.25 0.34 0.13 11.49 3,446 22,377 69,380 482 482 21,895 0.50 459.31 25 125 2.08 3.1 0.39 0.25 0.35 0.14 12.62 3,786 25,681 69,914 486 486 25,195 0.58 459.35 Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 88.41 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.46 Maxwell Drywells UNIT TIME-PERCENT OF LAG 203.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.06 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.25 LOW LOSS RATE - PERCENT 87.86% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 0.53 0.25 0.47 0.28 25.09 7,528 32,723 71,052 493 493 32,230 0.74 459.45 27 135 2.25 5.0 0.64 0.25 0.56 0.38 34.17 10,250 42,479 72,628 504 504 41,975 0.96 459.59 28 140 2.33 3.5 0.45 0.25 0.39 0.19 17.16 5,147 47,122 73,378 510 510 46,612 1.07 459.65 29 145 2.42 6.8 0.86 0.25 0.76 0.61 54.58 16,373 62,985 75,941 527 527 62,458 1.43 459.87 30 150 2.50 7.3 0.93 0.25 0.82 0.68 60.25 18,074 80,532 78,635 546 546 79,986 1.84 460.10 31 155 2.58 8.2 1.04 0.25 0.92 0.79 70.45 21,136 101,122 81,642 567 567 100,555 2.31 460.35 32 160 2.67 5.9 0.75 0.25 0.66 0.50 44.37 13,311 113,866 83,504 580 580 113,286 2.60 460.50 33 165 2.75 2.0 0.25 0.25 0.22 0.00 0.15 44 113,330 83,426 579 579 112,751 2.59 460.50 34 170 2.83 1.8 0.23 0.25 0.20 0.03 2.48 743 113,494 83,450 580 580 112,914 2.59 460.50 35 175 2.92 1.8 0.23 0.25 0.20 0.03 2.48 743 113,658 83,474 580 580 113,078 2.60 460.50 36 180 3.00 0.6 0.08 0.25 0.07 0.01 0.83 248 113,326 83,425 579 579 112,747 2.59 460.50 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 209,809 cu-ft 1.06 in 340,193 cu-ft 460.50 ft 70.45 cfs 17,637 cu-ft 97.98 cf/min 0.41 in 2.99 acft 130,384 cu-ft 2.60 acft 113,286 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 88.41 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.46 Maxwell Drywells UNIT TIME-PERCENT OF LAG 203.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.36 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.25 LOW LOSS RATE - PERCENT 87.86% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.08 0.25 0.07 0.01 0.88 265 265 65,808 457 265 0 0.00 459.00 2 10 0.17 0.6 0.10 0.25 0.09 0.01 1.06 318 318 65,816 457 318 0 0.00 459.00 3 15 0.25 0.6 0.10 0.25 0.09 0.01 1.06 318 318 65,816 457 318 0 0.00 459.00 4 20 0.33 0.6 0.10 0.25 0.09 0.01 1.06 318 318 65,816 457 318 0 0.00 459.00 5 25 0.42 0.6 0.10 0.25 0.09 0.01 1.06 318 318 65,816 457 318 0 0.00 459.00 6 30 0.50 0.7 0.11 0.25 0.10 0.01 1.24 371 371 65,825 457 371 0 0.00 459.00 7 35 0.58 0.7 0.11 0.25 0.10 0.01 1.24 371 371 65,825 457 371 0 0.00 459.00 8 40 0.67 0.7 0.11 0.25 0.10 0.01 1.24 371 371 65,825 457 371 0 0.00 459.00 9 45 0.75 0.7 0.11 0.25 0.10 0.01 1.24 371 371 65,825 457 371 0 0.00 459.00 10 50 0.83 0.7 0.11 0.25 0.10 0.01 1.24 371 371 65,825 457 371 0 0.00 459.00 11 55 0.92 0.7 0.11 0.25 0.10 0.01 1.24 371 371 65,825 457 371 0 0.00 459.00 12 60 1.00 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 13 65 1.08 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 14 70 1.17 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 15 75 1.25 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 16 80 1.33 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 17 85 1.42 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 18 90 1.50 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 19 95 1.58 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 20 100 1.67 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 21 105 1.75 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 22 110 1.83 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 23 115 1.92 0.8 0.13 0.25 0.11 0.02 1.41 424 424 65,833 457 424 0 0.00 459.00 24 120 2.00 0.9 0.15 0.25 0.13 0.02 1.59 477 477 65,842 457 457 20 0.00 459.00 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 88.41 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.46 Maxwell Drywells UNIT TIME-PERCENT OF LAG 203.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.36 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.25 LOW LOSS RATE - PERCENT 87.86% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.13 0.25 0.11 0.02 1.41 424 444 65,837 457 444 0 0.00 459.00 26 130 2.17 0.9 0.15 0.25 0.13 0.02 1.59 477 477 65,842 457 457 20 0.00 459.00 27 135 2.25 0.9 0.15 0.25 0.13 0.02 1.59 477 497 65,845 457 457 39 0.00 459.00 28 140 2.33 0.9 0.15 0.25 0.13 0.02 1.59 477 516 65,848 457 457 59 0.00 459.00 29 145 2.42 0.9 0.15 0.25 0.13 0.02 1.59 477 536 65,852 457 457 79 0.00 459.00 30 150 2.50 0.9 0.15 0.25 0.13 0.02 1.59 477 556 65,855 457 457 98 0.00 459.00 31 155 2.58 0.9 0.15 0.25 0.13 0.02 1.59 477 575 65,858 457 457 118 0.00 459.00 32 160 2.67 0.9 0.15 0.25 0.13 0.02 1.59 477 595 65,861 457 457 137 0.00 459.00 33 165 2.75 1.0 0.16 0.25 0.14 0.02 1.77 530 667 65,873 457 457 210 0.00 459.00 34 170 2.83 1.0 0.16 0.25 0.14 0.02 1.77 530 740 65,885 458 458 282 0.01 459.00 35 175 2.92 1.0 0.16 0.25 0.14 0.02 1.77 530 812 65,896 458 458 355 0.01 459.00 36 180 3.00 1.0 0.16 0.25 0.14 0.02 1.77 530 885 65,908 458 458 427 0.01 459.01 37 185 3.08 1.0 0.16 0.25 0.14 0.02 1.77 530 957 65,920 458 458 499 0.01 459.01 38 190 3.17 1.1 0.18 0.25 0.16 0.02 1.94 583 1,082 65,940 458 458 624 0.01 459.01 39 195 3.25 1.1 0.18 0.25 0.16 0.02 1.94 583 1,207 65,960 458 458 749 0.02 459.01 40 200 3.33 1.1 0.18 0.25 0.16 0.02 1.94 583 1,332 65,980 458 458 874 0.02 459.01 41 205 3.42 1.2 0.20 0.25 0.17 0.02 2.12 636 1,510 66,009 458 458 1,051 0.02 459.01 42 210 3.50 1.3 0.21 0.25 0.19 0.03 2.30 689 1,740 66,046 459 459 1,282 0.03 459.02 43 215 3.58 1.4 0.23 0.25 0.20 0.03 2.47 742 2,023 66,092 459 459 1,564 0.04 459.02 44 220 3.67 1.4 0.23 0.25 0.20 0.03 2.47 742 2,306 66,138 459 459 1,847 0.04 459.03 45 225 3.75 1.5 0.24 0.25 0.22 0.03 2.65 795 2,642 66,192 460 460 2,182 0.05 459.03 46 230 3.83 1.5 0.24 0.25 0.22 0.03 2.65 795 2,977 66,246 460 460 2,517 0.06 459.04 47 235 3.92 1.6 0.26 0.25 0.23 0.01 0.75 224 2,741 66,208 460 460 2,281 0.05 459.03 48 240 4.00 1.6 0.26 0.25 0.23 0.01 0.75 224 2,504 66,170 460 460 2,045 0.05 459.03 49 245 4.08 1.7 0.28 0.25 0.24 0.02 2.20 660 2,705 66,202 460 460 2,245 0.05 459.03 50 250 4.17 1.8 0.29 0.25 0.26 0.04 3.65 1,096 3,342 66,305 460 460 2,881 0.07 459.04 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 88.41 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.46 Maxwell Drywells UNIT TIME-PERCENT OF LAG 203.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.36 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.25 LOW LOSS RATE - PERCENT 87.86% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.31 0.25 0.27 0.06 5.11 1,533 4,414 66,478 462 462 3,952 0.09 459.06 52 260 4.33 2.0 0.33 0.25 0.29 0.07 6.56 1,969 5,922 66,722 463 463 5,459 0.13 459.08 53 265 4.42 2.1 0.34 0.25 0.30 0.09 8.02 2,406 7,864 67,036 466 466 7,399 0.17 459.10 54 270 4.50 2.1 0.34 0.25 0.30 0.09 8.02 2,406 9,805 67,349 468 468 9,337 0.21 459.13 55 275 4.58 2.2 0.36 0.25 0.32 0.11 9.47 2,842 12,179 67,733 470 470 11,709 0.27 459.16 56 280 4.67 2.3 0.38 0.25 0.33 0.12 10.93 3,279 14,988 68,186 474 474 14,514 0.33 459.20 57 285 4.75 2.4 0.39 0.25 0.34 0.14 12.38 3,715 18,230 68,710 477 477 17,753 0.41 459.25 58 290 4.83 2.4 0.39 0.25 0.34 0.14 12.38 3,715 21,468 69,233 481 481 20,987 0.48 459.29 59 295 4.92 2.5 0.41 0.25 0.36 0.16 13.84 4,152 25,139 69,826 485 485 24,654 0.57 459.35 60 300 5.00 2.6 0.42 0.25 0.37 0.17 15.29 4,588 29,242 70,489 490 490 28,753 0.66 459.40 61 305 5.08 3.1 0.51 0.25 0.44 0.25 22.57 6,771 35,523 71,504 497 497 35,027 0.80 459.49 62 310 5.17 3.6 0.59 0.25 0.52 0.33 29.84 8,953 43,980 72,870 506 506 43,474 1.00 459.61 63 315 5.25 3.9 0.64 0.25 0.56 0.38 34.21 10,262 53,736 74,447 517 517 53,219 1.22 459.74 64 320 5.33 4.2 0.69 0.25 0.60 0.43 38.57 11,572 64,791 76,233 529 529 64,262 1.48 459.90 65 325 5.42 4.7 0.77 0.25 0.67 0.51 45.85 13,754 78,016 78,268 544 544 77,472 1.78 460.07 66 330 5.50 5.6 0.91 0.25 0.80 0.66 58.94 17,682 95,155 80,771 561 561 94,594 2.17 460.28 67 335 5.58 1.9 0.31 0.25 0.27 0.06 5.11 1,533 96,127 80,913 562 562 95,565 2.19 460.29 68 340 5.67 0.9 0.15 0.25 0.13 0.02 1.59 477 96,042 80,900 562 562 95,480 2.19 460.29 69 345 5.75 0.6 0.10 0.25 0.09 0.01 1.06 318 95,798 80,865 562 562 95,236 2.19 460.29 70 350 5.83 0.5 0.08 0.25 0.07 0.01 0.88 265 95,501 80,822 561 561 94,940 2.18 460.28 71 355 5.92 0.3 0.05 0.25 0.04 0.01 0.53 159 95,099 80,763 561 561 94,538 2.17 460.28 72 360 6.00 0.2 0.03 0.25 0.03 0.00 0.35 106 94,644 80,696 560 560 94,084 2.16 460.27 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 436,474 cu-ft 1.36 in 309,926 cu-ft 460.29 ft 58.94 cfs 90.18 cf/min 32,464 cu-ft 0.39 in 2.91 acft 126,548 cu-ft 2.19 acft 95,565 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 88.41 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 2.46 C 0.00234 Maxwell Drywells UNIT TIME-PERCENT OF LAG 611%Low Loss Rate (percent)87.86%Number 0 TOTAL ADJUSTED STORM RAIN (in)2.23 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.018 0.446 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 2 30 0.50 0.3 0.027 0.441 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 3 45 0.75 0.3 0.027 0.436 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 4 60 1.00 0.4 0.036 0.431 0.031 0.00 0.39 348 348 65,821 1,371 348 0 0.00 459.00 5 75 1.25 0.3 0.027 0.426 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 6 90 1.50 0.3 0.027 0.421 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 7 105 1.75 0.3 0.027 0.416 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 8 120 2.00 0.4 0.036 0.411 0.031 0.00 0.39 348 348 65,821 1,371 348 0 0.00 459.00 9 135 2.25 0.4 0.036 0.406 0.031 0.00 0.39 348 348 65,821 1,371 348 0 0.00 459.00 10 150 2.50 0.4 0.036 0.401 0.031 0.00 0.39 348 348 65,821 1,371 348 0 0.00 459.00 11 165 2.75 0.5 0.045 0.396 0.039 0.01 0.48 434 434 65,835 1,372 434 0 0.00 459.00 12 180 3.00 0.5 0.045 0.391 0.039 0.01 0.48 434 434 65,835 1,372 434 0 0.00 459.00 13 195 3.25 0.5 0.045 0.386 0.039 0.01 0.48 434 434 65,835 1,372 434 0 0.00 459.00 14 210 3.50 0.5 0.045 0.381 0.039 0.01 0.48 434 434 65,835 1,372 434 0 0.00 459.00 15 225 3.75 0.5 0.045 0.377 0.039 0.01 0.48 434 434 65,835 1,372 434 0 0.00 459.00 16 240 4.00 0.6 0.054 0.372 0.047 0.01 0.58 521 521 65,849 1,372 521 0 0.00 459.00 17 255 4.25 0.6 0.054 0.367 0.047 0.01 0.58 521 521 65,849 1,372 521 0 0.00 459.00 18 270 4.50 0.7 0.062 0.363 0.055 0.01 0.68 608 608 65,863 1,372 608 0 0.00 459.00 19 285 4.75 0.7 0.062 0.358 0.055 0.01 0.68 608 608 65,863 1,372 608 0 0.00 459.00 20 300 5.00 0.8 0.071 0.353 0.063 0.01 0.77 695 695 65,877 1,372 695 0 0.00 459.00 21 315 5.25 0.6 0.054 0.349 0.047 0.01 0.58 521 521 65,849 1,372 521 0 0.00 459.00 22 330 5.50 0.7 0.062 0.344 0.055 0.01 0.68 608 608 65,863 1,372 608 0 0.00 459.00 23 345 5.75 0.8 0.071 0.340 0.063 0.01 0.77 695 695 65,877 1,372 695 0 0.00 459.00 24 360 6.00 0.8 0.071 0.335 0.063 0.01 0.77 695 695 65,877 1,372 695 0 0.00 459.00 25 375 6.25 0.9 0.080 0.331 0.071 0.01 0.87 782 782 65,891 1,373 782 0 0.00 459.00 26 390 6.50 0.9 0.080 0.326 0.071 0.01 0.87 782 782 65,891 1,373 782 0 0.00 459.00 27 405 6.75 1.0 0.089 0.322 0.078 0.01 0.97 869 869 65,905 1,373 869 0 0.00 459.00 28 420 7.00 1.0 0.089 0.318 0.078 0.01 0.97 869 869 65,905 1,373 869 0 0.00 459.00 29 435 7.25 1.0 0.089 0.313 0.078 0.01 0.97 869 869 65,905 1,373 869 0 0.00 459.00 30 450 7.50 1.1 0.098 0.309 0.086 0.01 1.06 956 956 65,919 1,373 956 0 0.00 459.00 31 465 7.75 1.2 0.107 0.305 0.094 0.01 1.16 1,043 1,043 65,933 1,374 1,043 0 0.00 459.00 32 480 8.00 1.3 0.116 0.301 0.102 0.01 1.26 1,130 1,130 65,948 1,374 1,130 0 0.00 459.00 33 495 8.25 1.5 0.134 0.296 0.118 0.02 1.45 1,303 1,303 65,976 1,374 1,303 0 0.00 459.00 34 510 8.50 1.5 0.134 0.292 0.118 0.02 1.45 1,303 1,303 65,976 1,374 1,303 0 0.00 459.00 35 525 8.75 1.6 0.143 0.288 0.125 0.02 1.54 1,390 1,390 65,990 1,375 1,375 16 0.00 459.00 36 540 9.00 1.7 0.152 0.284 0.133 0.02 1.64 1,477 1,493 66,006 1,375 1,375 118 0.00 459.00 37 555 9.25 1.9 0.169 0.280 0.149 0.02 1.83 1,651 1,769 66,051 1,376 1,376 393 0.01 459.01 38 570 9.50 2.0 0.178 0.276 0.157 0.02 1.93 1,738 2,130 66,109 1,377 1,377 753 0.02 459.01 39 585 9.75 2.1 0.187 0.272 0.165 0.02 2.03 1,825 2,578 66,181 1,379 1,379 1,199 0.03 459.02 40 600 10.00 2.2 0.196 0.268 0.172 0.02 2.12 1,912 3,111 66,268 1,381 1,381 1,730 0.04 459.02 41 615 10.25 1.5 0.134 0.264 0.118 0.02 1.45 1,303 3,034 66,255 1,380 1,380 1,653 0.04 459.02 42 630 10.50 1.5 0.134 0.261 0.118 0.02 1.45 1,303 2,957 66,243 1,380 1,380 1,577 0.04 459.02 43 645 10.75 2.0 0.178 0.257 0.157 0.02 1.93 1,738 3,315 66,301 1,381 1,381 1,933 0.04 459.03 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 88.41 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 2.46 C 0.00234 Maxwell Drywells UNIT TIME-PERCENT OF LAG 611%Low Loss Rate (percent)87.86%Number 0 TOTAL ADJUSTED STORM RAIN (in)2.23 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 44 660 11.00 2.0 0.178 0.253 0.157 0.02 1.93 1,738 3,671 66,358 1,382 1,382 2,289 0.05 459.03 45 675 11.25 1.9 0.169 0.249 0.149 0.02 1.83 1,651 3,940 66,402 1,383 1,383 2,556 0.06 459.04 46 690 11.50 1.9 0.169 0.246 0.149 0.02 1.83 1,651 4,207 66,445 1,384 1,384 2,823 0.06 459.04 47 705 11.75 1.7 0.152 0.242 0.133 0.02 1.64 1,477 4,300 66,460 1,385 1,385 2,916 0.07 459.04 48 720 12.00 1.8 0.161 0.238 0.141 0.02 1.74 1,564 4,480 66,489 1,385 1,385 3,095 0.07 459.04 49 735 12.25 2.5 0.223 0.235 0.196 0.03 2.41 2,172 5,267 66,616 1,388 1,388 3,879 0.09 459.05 50 750 12.50 2.6 0.232 0.231 0.204 0.00 0.06 54 3,933 66,400 1,383 1,383 2,550 0.06 459.04 51 765 12.75 2.8 0.250 0.228 0.219 0.02 1.96 1,764 4,313 66,462 1,385 1,385 2,929 0.07 459.04 52 780 13.00 2.9 0.259 0.224 0.227 0.03 3.06 2,755 5,684 66,683 1,389 1,389 4,295 0.10 459.06 53 795 13.25 3.4 0.303 0.221 0.266 0.08 7.34 6,606 10,900 67,526 1,407 1,407 9,493 0.22 459.13 54 810 13.50 3.4 0.303 0.218 0.266 0.09 7.64 6,874 16,368 68,409 1,425 1,425 14,942 0.34 459.21 55 825 13.75 2.3 0.205 0.214 0.180 0.02 2.22 1,999 16,941 68,502 1,427 1,427 15,514 0.36 459.22 56 840 14.00 2.3 0.205 0.211 0.180 0.02 2.22 1,999 17,512 68,594 1,429 1,429 16,083 0.37 459.23 57 855 14.25 2.7 0.241 0.208 0.212 0.03 2.94 2,649 18,733 68,791 1,433 1,433 17,300 0.40 459.24 58 870 14.50 2.6 0.232 0.205 0.204 0.03 2.43 2,188 19,488 68,913 1,436 1,436 18,052 0.41 459.25 59 885 14.75 2.6 0.232 0.202 0.204 0.03 2.71 2,439 20,492 69,076 1,439 1,439 19,053 0.44 459.27 60 900 15.00 2.5 0.223 0.198 0.196 0.02 2.19 1,971 21,024 69,162 1,441 1,441 19,583 0.45 459.27 61 915 15.25 2.4 0.214 0.195 0.188 0.02 1.67 1,499 21,082 69,171 1,441 1,441 19,641 0.45 459.27 62 930 15.50 2.3 0.205 0.192 0.180 0.01 1.14 1,023 20,664 69,103 1,440 1,440 19,224 0.44 459.27 63 945 15.75 1.9 0.169 0.189 0.149 0.02 1.83 1,651 20,875 69,138 1,440 1,440 19,435 0.45 459.27 64 960 16.00 1.9 0.169 0.187 0.149 0.02 1.83 1,651 21,086 69,172 1,441 1,441 19,645 0.45 459.27 65 975 16.25 0.4 0.036 0.184 0.031 0.00 0.39 348 19,992 68,995 1,437 1,437 18,555 0.43 459.26 66 990 16.50 0.4 0.036 0.181 0.031 0.00 0.39 348 18,902 68,819 1,434 1,434 17,469 0.40 459.24 67 1005 16.75 0.3 0.027 0.178 0.024 0.00 0.29 261 17,729 68,629 1,430 1,430 16,300 0.37 459.23 68 1020 17.00 0.3 0.027 0.175 0.024 0.00 0.29 261 16,560 68,440 1,426 1,426 15,134 0.35 459.21 69 1035 17.25 0.5 0.045 0.173 0.039 0.01 0.48 434 15,569 68,280 1,423 1,423 14,146 0.32 459.20 70 1050 17.50 0.5 0.045 0.170 0.039 0.01 0.48 434 14,581 68,121 1,419 1,419 13,162 0.30 459.18 71 1065 17.75 0.5 0.045 0.168 0.039 0.01 0.48 434 13,596 67,962 1,416 1,416 12,180 0.28 459.17 72 1080 18.00 0.4 0.036 0.165 0.031 0.00 0.39 348 12,528 67,789 1,412 1,412 11,116 0.26 459.16 73 1095 18.25 0.4 0.036 0.163 0.031 0.00 0.39 348 11,463 67,617 1,409 1,409 10,055 0.23 459.14 74 1110 18.50 0.4 0.036 0.160 0.031 0.00 0.39 348 10,402 67,446 1,405 1,405 8,997 0.21 459.13 75 1125 18.75 0.3 0.027 0.158 0.024 0.00 0.29 261 9,258 67,261 1,401 1,401 7,856 0.18 459.11 76 1140 19.00 0.2 0.018 0.156 0.016 0.00 0.19 174 8,030 67,062 1,397 1,397 6,633 0.15 459.09 77 1155 19.25 0.3 0.027 0.154 0.024 0.00 0.29 261 6,894 66,879 1,393 1,393 5,500 0.13 459.08 78 1170 19.50 0.4 0.036 0.152 0.031 0.00 0.39 348 5,848 66,710 1,390 1,390 4,458 0.10 459.06 79 1185 19.75 0.3 0.027 0.149 0.024 0.00 0.29 261 4,719 66,527 1,386 1,386 3,333 0.08 459.05 80 1200 20.00 0.2 0.018 0.147 0.016 0.00 0.19 174 3,507 66,332 1,382 1,382 2,125 0.05 459.03 81 1215 20.25 0.3 0.027 0.145 0.024 0.00 0.29 261 2,386 66,150 1,378 1,378 1,007 0.02 459.01 82 1230 20.50 0.3 0.027 0.144 0.024 0.00 0.29 261 1,268 65,970 1,374 1,268 0 0.00 459.00 83 1245 20.75 0.3 0.027 0.142 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 84 1260 21.00 0.2 0.018 0.140 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 85 1275 21.25 0.3 0.027 0.138 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 86 1290 21.50 0.2 0.018 0.137 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 88.41 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 2.46 C 0.00234 Maxwell Drywells UNIT TIME-PERCENT OF LAG 611%Low Loss Rate (percent)87.86%Number 0 TOTAL ADJUSTED STORM RAIN (in)2.23 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 87 1305 21.75 0.3 0.027 0.135 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 88 1320 22.00 0.2 0.018 0.134 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 89 1335 22.25 0.3 0.027 0.133 0.024 0.00 0.29 261 261 65,807 1,371 261 0 0.00 459.00 90 1350 22.50 0.2 0.018 0.131 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 91 1365 22.75 0.2 0.018 0.130 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 92 1380 23.00 0.2 0.018 0.129 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 93 1395 23.25 0.2 0.018 0.128 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 94 1410 23.50 0.2 0.018 0.128 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 95 1425 23.75 0.2 0.018 0.127 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 96 1440 24.00 0.2 0.018 0.126 0.016 0.00 0.19 174 174 65,793 1,371 174 0 0.00 459.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 2.23 in 715,689 cu-ft 625,214 cu-ft 459.27 ft 7.64 cfs 90,475 cu-ft 62.83 cf/min 0.28 in 2.08 acft 90,475 cu-ft 0.45 acft 19,645 cu-ft Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL 10 YEAR BASIN BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 DLS 2553 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 2.071 D 56 0.51 1.00 1 B COMMERCIAL 5.752 D 56 0.51 0.90 6 B SF - HIGH DENSITY 8.141 D 56 0.51 0.50 9 B LANDSCAPING 1.350 D 56 0.51 0.10 1,260 ft 630 ft 465.3 ft ELEVATION OF CONCENTRATION POINT 458.0 ft 0.02 10 LOW LOSS RATE (For Storms Greater Than 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 0.71 in 3-HOUR 1.06 in 6-HOUR 1.36 in 24-HOUR 2.23 in ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) AMC NUMBER LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME March 30, 2020 PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION CORAL MOUNTAIN REQUIRED 10 YEAR STORAGE DA-A2 PROJECT: Job No.: BY:DATE:3/30/20 1] AMC 2] FREQUENCY-YEARS NOAA ATLAS 3] DURATION: 1-HOUR 3-HOUR 6-HOUR 24-HOUR 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 RAINFALL DATA 18] 200% OF LAG-MINUTES STORM EVENT SUMMARY 7.8 II 10 14 Point Rain 0.71 in 1.06 in 1.36 in 2.23 in 8] ELEVATION OF HEADWATER 0.005 630.00 12] S^0.5 0.119 0.02 17] 100% OF LAG-MINUTES 3.9 3.9 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.06 16] LAG TIME-MINUTES 1260 DLS 0.239 465.3 458 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD REQUIRED 10 YEAR STORAGE DA-A2 CORAL MOUNTAIN 2] AREA DESIGNATION HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 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. 17.314 PHYSICAL DATA 1] CONCENTRATION POINT 10] H-FEET 30.6 3] AREA - ACRES 4] L-FEET 5] L-MILES 13] L*LCA/S^0.5 5.53 11] S-FEET/MILE 6] La-FEET 7] La-MILES 7.3 9] ELEVATION OF CONCENTRATION POINT Plate E-2.1 Page 2 of 9 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 2.071 0.120 0.0061 DEVELOPED 0.1000 0.0120 B 56 0.51 90%0.10 5.752 0.332 0.0322 DEVELOPED 0.1800 0.0598 B 56 0.51 50%0.28 8.141 0.470 0.1319 DEVELOPED 0.5000 0.2351 B 56 0.51 10%0.46 1.350 0.078 0.0362 DEVELOPED 0.8200 0.0639 SUM 17.314 SUM 0.2064 0.3708 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.10318457 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00191 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55 =0.00191 0.10 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.2064 in/hr Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.3708 in/hr Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. AMC II AVERAGE ADJUSTED LOSS RATE 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE COMMERCIAL SF - HIGH DENSITY LANDSCAPING CORAL MOUNTAIN DLS 2553 RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM Plate E-2.1 Page 3 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)0.71 RAINFALL VOLUME (cuft)44,624 SOIL LOSSES (cuft)12,970 EFFECTIVE RAIN (in)0.50 FLOOD VOLUME (acft)0.73 FLOOD VOLUME (cuft)31,653 PEAK FLOW RATE (cfs)47.71 in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)1.06 RAINFALL VOLUME (cuft)66,621 SOIL LOSSES (cuft)32,123 EFFECTIVE RAIN (in)0.55 FLOOD VOLUME (acft)0.79 FLOOD VOLUME (cuft)34,498 PEAK FLOW RATE (cfs)14.61 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3-HOUR STORM RCFC & WCD HYDROLOGY Plate E-2.2 3-Hour Storm Page 5 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD Plate E-2.2 6-Hour Storm Page 6 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 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)1.36 RAINFALL VOLUME (cuft)85,476 SOIL LOSSES (cuft)39,734 EFFECTIVE RAIN (in)0.73 FLOOD VOLUME (acft)1.05 FLOOD VOLUME (cuft)45,742 PEAK FLOW RATE (cfs)12.35 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 17.314 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2064 LAG TIME - MINUTES 3.89 MINIMUM LOSS RATE (for var. loss) - in/hr 0.103 UNIT TIME-PERCENT OF LAG 385.7 LOW LOSS RATE - DECIMAL 0.37 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00191 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM Plate E-2.2 24 Hour Storm Page 8 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 17.314 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2064 LAG TIME - MINUTES 3.89 MINIMUM LOSS RATE (for var. loss) - in/hr 0.103 UNIT TIME-PERCENT OF LAG 385.7 LOW LOSS RATE - DECIMAL 0.37 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00191 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 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)2.23 RAINFALL VOLUME (cuft)140,156 SOIL LOSSES (cuft)73,692 EFFECTIVE RAIN (in)1.06 FLOOD VOLUME (acft)1.53 FLOOD VOLUME (cuft)66,464 PEAK FLOW (cfs)2.19 Plate E-2.2 24 Hour Storm Page 9 of 9 DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 11 D EXISTING BARREN 1.268 X 93 0.09 0.05 12 B EXISTING OPEN BRUSH - POOR 4.870 X 76 0.29 0.05 2 B PAVING/HARDSCAPE 0.011 D 56 0.51 1.00 3 B WATER FEATURE 0.000 D 56 0.51 1.00 1 B COMMERCIAL 0.000 D 56 0.51 0.90 6 B SF - HIGH DENSITY 0.000 D 56 0.51 0.50 9 B LANDSCAPING 18.819 D 56 0.51 0.10 1,050 ft 525 ft 520.0 ft ELEVATION OF CONCENTRATION POINT 472.0 ft 0.03 10 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 0.71 in 3-HOUR 1.06 in 6-HOUR 1.36 in 24-HOUR 2.23 in BASIN CHARACTERISTICS:ELEVATION AREA 468.0 ft 10,730 sf 469.0 ft 17,060 sf 470.0 ft 24,025 sf PERCOLATION RATE (in/hr)1.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 10 YEAR BASIN AMC NUMBER RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention DA-A3 Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)64,441 96,072 123,263 202,114 SOIL LOSSES (cu-ft)32,724 69,661 96,384 169,645 EFFECTIVE RAIN (in)0.35 0.29 0.30 0.36 FLOOD VOLUME (cu-ft)31,717 26,411 26,879 32,470 acre-ft)0.73 0.61 0.62 0.75 REQUIRED STORAGE (cu-ft)30,493 23,026 20,546 14,184 acre-ft)0.70 0.53 0.47 0.33 FACTOR OF SAFETY 1.12 1.49 1.67 2.41 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 15.98 12.73 1.23 MAXIMUM WSEL (ft)469.82 469.45 469.33 469.02 DEPTH (ft)1.82 1.45 1.33 1.02 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days)1.1 1.0 1.0 1.3 10 YEAR BASIN DA-A3 CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 24.968 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION 3] AREA - ACRES 4] L-FEET 5] L-MILES 1050 0.199 13] L*LCA/S^0.5 15.54 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.001 525.00 12] S^0.5 0.099 241.4 520 472 48 0.03 17] 100% OF LAG-MINUTES 3.4 3.4 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.06 16] LAG TIME-MINUTES 18] 200% OF LAG-MINUTES RAINFALL DATA 6.9 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. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 34,217 0.79 Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] D 93 0.09 5%0.09 1.268 0.051 0.0044 UNDEVELOPED 0.9000 0.0457 B 76 0.29 5%0.28 4.870 0.195 0.0540 UNDEVELOPED 0.9000 0.1755 B 56 0.51 100%0.05 0.011 0.000 0.0000 DEVELOPED 0.1000 0.0000 B 56 0.51 100%0.05 0.000 0.000 0.0000 DEVELOPED 0.1000 0.0000 B 56 0.51 90%0.10 0.000 0.000 0.0000 DEVELOPED 0.1800 0.0000 B 56 0.51 50%0.28 0.000 0.000 0.0000 DEVELOPED 0.5000 0.0000 B 56 0.51 10%0.46 18.819 0.754 0.3498 DEVELOPED 0.8200 0.6181 SUM 24.968 SUM 0.4082 0.8393 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.204105054 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00378 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00378 0.20 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.4082 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8393 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II 24-(T/60))^1.55 + LAND USE EXISTING BARREN EXISTING OPEN BRUSH - POOR PAVING/HARDSCAPE WATER FEATURE COMMERCIAL SF - HIGH DENSITY LANDSCAPING Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 24.97 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.43 Maxwell Drywells UNIT TIME-PERCENT OF LAG 145.8 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 0.71 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.41 LOW LOSS RATE - PERCENT 83.93% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.31 0.41 0.26 0.05 1.24 373 373 10,901 76 76 297 0.01 468.02 2 10 0.17 4.2 0.36 0.41 0.30 0.06 1.45 435 732 11,066 77 77 655 0.02 468.05 3 15 0.25 4.4 0.38 0.41 0.32 0.06 1.52 456 1,110 11,240 78 78 1,032 0.02 468.07 4 20 0.33 4.6 0.39 0.41 0.33 0.06 1.59 476 1,509 11,423 79 79 1,429 0.03 468.10 5 25 0.42 5.0 0.43 0.41 0.36 0.02 0.46 139 1,568 11,451 80 80 1,489 0.03 468.11 6 30 0.50 5.6 0.48 0.41 0.40 0.07 1.75 526 2,014 11,656 81 81 1,933 0.04 468.14 7 35 0.58 6.4 0.55 0.41 0.46 0.14 3.47 1,041 2,974 12,097 84 84 2,890 0.07 468.21 8 40 0.67 8.1 0.69 0.41 0.58 0.28 7.12 2,137 5,027 13,040 91 91 4,936 0.11 468.36 9 45 0.75 13.1 1.12 0.41 0.94 0.71 17.86 5,359 10,295 15,461 107 107 10,188 0.23 468.74 10 50 0.83 34.5 2.94 0.41 2.47 2.54 63.83 19,149 29,337 22,362 155 155 29,181 0.67 469.75 11 55 0.92 6.7 0.57 0.41 0.48 0.16 4.11 1,234 30,416 22,730 158 158 30,258 0.69 469.81 12 60 1.00 3.8 0.32 0.41 0.27 0.05 1.31 393 30,651 22,810 158 158 30,493 0.70 469.82 TOTAL RAINFALL 0.71 in RAINFALL VOLUME 64,441 cu-ft SOIL LOSSES 32,724 cu-ft EFFECTIVE RAIN 0.35 in FLOOD VOLUME 0.73 acft FLOOD VOLUME 31,717 cu-ft REQUIRED STORAGE 0.70 REQUIRED STORAGE 30,493 cu-ft MAX WSEL 469.82 ft PEAK FLOW RATE 63.83 cfs TOTAL BASIN LOSSES 1,224 cu-ft AVERAGE PERCOLATION RATE 20.40 cf/min CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 24.97 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.43 Maxwell Drywells UNIT TIME-PERCENT OF LAG 145.8 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.06 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.41 LOW LOSS RATE - PERCENT 83.93% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.17 0.41 0.14 0.03 0.67 201 201 10,822 75 75 125 0.00 468.01 2 10 0.17 1.3 0.17 0.41 0.14 0.03 0.67 201 326 10,880 76 76 251 0.01 468.02 3 15 0.25 1.1 0.14 0.41 0.12 0.02 0.57 170 420 10,923 76 76 344 0.01 468.03 4 20 0.33 1.5 0.19 0.41 0.16 0.03 0.77 232 576 10,995 76 76 500 0.01 468.04 5 25 0.42 1.5 0.19 0.41 0.16 0.03 0.77 232 731 11,066 77 77 654 0.02 468.05 6 30 0.50 1.8 0.23 0.41 0.19 0.04 0.93 278 932 11,158 77 77 855 0.02 468.06 7 35 0.58 1.5 0.19 0.41 0.16 0.03 0.77 232 1,086 11,229 78 78 1,008 0.02 468.07 8 40 0.67 1.8 0.23 0.41 0.19 0.04 0.93 278 1,286 11,321 79 79 1,207 0.03 468.09 9 45 0.75 1.8 0.23 0.41 0.19 0.04 0.93 278 1,485 11,413 79 79 1,406 0.03 468.10 10 50 0.83 1.5 0.19 0.41 0.16 0.03 0.77 232 1,637 11,483 80 80 1,558 0.04 468.11 11 55 0.92 1.6 0.20 0.41 0.17 0.03 0.82 247 1,805 11,559 80 80 1,724 0.04 468.13 12 60 1.00 1.8 0.23 0.41 0.19 0.04 0.93 278 2,002 11,650 81 81 1,921 0.04 468.14 13 65 1.08 2.2 0.28 0.41 0.23 0.04 1.13 340 2,261 11,769 82 82 2,179 0.05 468.16 14 70 1.17 2.2 0.28 0.41 0.23 0.04 1.13 340 2,519 11,888 83 83 2,436 0.06 468.18 15 75 1.25 2.2 0.28 0.41 0.23 0.04 1.13 340 2,776 12,006 83 83 2,692 0.06 468.20 16 80 1.33 2.0 0.25 0.41 0.21 0.04 1.03 309 3,001 12,109 84 84 2,917 0.07 468.21 17 85 1.42 2.6 0.33 0.41 0.28 0.05 1.34 401 3,318 12,255 85 85 3,233 0.07 468.23 18 90 1.50 2.7 0.34 0.41 0.29 0.06 1.39 417 3,650 12,407 86 86 3,564 0.08 468.26 19 95 1.58 2.4 0.31 0.41 0.26 0.05 1.23 370 3,934 12,538 87 87 3,847 0.09 468.28 20 100 1.67 2.7 0.34 0.41 0.29 0.06 1.39 417 4,264 12,690 88 88 4,176 0.10 468.30 21 105 1.75 3.3 0.42 0.41 0.35 0.01 0.29 87 4,263 12,689 88 88 4,175 0.10 468.30 22 110 1.83 3.1 0.39 0.41 0.33 0.06 1.59 478 4,653 12,869 89 89 4,564 0.10 468.33 23 115 1.92 2.9 0.37 0.41 0.31 0.06 1.49 448 5,011 13,033 91 91 4,921 0.11 468.36 24 120 2.00 3.0 0.38 0.41 0.32 0.06 1.54 463 5,384 13,204 92 92 5,292 0.12 468.38 25 125 2.08 3.1 0.39 0.41 0.33 0.06 1.59 478 5,771 13,382 93 93 5,678 0.13 468.41 Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 24.97 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.43 Maxwell Drywells UNIT TIME-PERCENT OF LAG 145.8 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.06 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.41 LOW LOSS RATE - PERCENT 83.93% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 0.53 0.41 0.45 0.13 3.17 952 6,630 13,777 96 96 6,534 0.15 468.47 27 135 2.25 5.0 0.64 0.41 0.53 0.23 5.73 1,720 8,254 14,524 101 101 8,153 0.19 468.59 28 140 2.33 3.5 0.45 0.41 0.37 0.04 0.93 279 8,433 14,606 101 101 8,331 0.19 468.60 29 145 2.42 6.8 0.86 0.41 0.73 0.46 11.50 3,450 11,781 16,144 112 112 11,669 0.27 468.85 30 150 2.50 7.3 0.93 0.41 0.78 0.52 13.10 3,930 15,599 17,682 123 123 15,476 0.36 469.08 31 155 2.58 8.2 1.04 0.41 0.88 0.63 15.98 4,795 20,271 19,274 134 134 20,137 0.46 469.31 32 160 2.67 5.9 0.75 0.41 0.63 0.34 8.62 2,585 22,722 20,109 140 140 22,583 0.52 469.43 33 165 2.75 2.0 0.25 0.41 0.21 0.04 1.03 309 22,892 20,167 140 140 22,751 0.52 469.44 34 170 2.83 1.8 0.23 0.41 0.19 0.04 0.93 278 23,029 20,213 140 140 22,889 0.53 469.45 35 175 2.92 1.8 0.23 0.41 0.19 0.04 0.93 278 23,167 20,260 141 141 23,026 0.53 469.45 36 180 3.00 0.6 0.08 0.41 0.06 0.01 0.31 93 23,119 20,244 141 141 22,978 0.53 469.45 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 69,661 cu-ft 1.06 in 96,072 cu-ft 469.45 ft 15.98 cfs 3,433 cu-ft 19.07 cf/min 0.29 in 0.61 acft 26,411 cu-ft 0.53 acft 23,026 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 24.97 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.43 Maxwell Drywells UNIT TIME-PERCENT OF LAG 145.8 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.36 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.41 LOW LOSS RATE - PERCENT 83.93% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.08 0.41 0.07 0.01 0.33 99 99 10,776 75 75 24 0.00 468.00 2 10 0.17 0.6 0.10 0.41 0.08 0.02 0.40 119 143 10,796 75 75 68 0.00 468.00 3 15 0.25 0.6 0.10 0.41 0.08 0.02 0.40 119 187 10,816 75 75 112 0.00 468.01 4 20 0.33 0.6 0.10 0.41 0.08 0.02 0.40 119 231 10,836 75 75 155 0.00 468.01 5 25 0.42 0.6 0.10 0.41 0.08 0.02 0.40 119 274 10,856 75 75 199 0.00 468.01 6 30 0.50 0.7 0.11 0.41 0.10 0.02 0.46 139 337 10,885 76 76 262 0.01 468.02 7 35 0.58 0.7 0.11 0.41 0.10 0.02 0.46 139 400 10,914 76 76 325 0.01 468.02 8 40 0.67 0.7 0.11 0.41 0.10 0.02 0.46 139 463 10,943 76 76 387 0.01 468.03 9 45 0.75 0.7 0.11 0.41 0.10 0.02 0.46 139 526 10,972 76 76 450 0.01 468.03 10 50 0.83 0.7 0.11 0.41 0.10 0.02 0.46 139 588 11,000 76 76 512 0.01 468.04 11 55 0.92 0.7 0.11 0.41 0.10 0.02 0.46 139 650 11,029 77 77 574 0.01 468.04 12 60 1.00 0.8 0.13 0.41 0.11 0.02 0.53 158 732 11,067 77 77 655 0.02 468.05 13 65 1.08 0.8 0.13 0.41 0.11 0.02 0.53 158 814 11,104 77 77 737 0.02 468.05 14 70 1.17 0.8 0.13 0.41 0.11 0.02 0.53 158 895 11,141 77 77 818 0.02 468.06 15 75 1.25 0.8 0.13 0.41 0.11 0.02 0.53 158 976 11,179 78 78 899 0.02 468.07 16 80 1.33 0.8 0.13 0.41 0.11 0.02 0.53 158 1,057 11,216 78 78 979 0.02 468.07 17 85 1.42 0.8 0.13 0.41 0.11 0.02 0.53 158 1,138 11,253 78 78 1,059 0.02 468.08 18 90 1.50 0.8 0.13 0.41 0.11 0.02 0.53 158 1,218 11,290 78 78 1,139 0.03 468.08 19 95 1.58 0.8 0.13 0.41 0.11 0.02 0.53 158 1,298 11,326 79 79 1,219 0.03 468.09 20 100 1.67 0.8 0.13 0.41 0.11 0.02 0.53 158 1,378 11,363 79 79 1,299 0.03 468.09 21 105 1.75 0.8 0.13 0.41 0.11 0.02 0.53 158 1,457 11,400 79 79 1,378 0.03 468.10 22 110 1.83 0.8 0.13 0.41 0.11 0.02 0.53 158 1,536 11,436 79 79 1,457 0.03 468.11 23 115 1.92 0.8 0.13 0.41 0.11 0.02 0.53 158 1,615 11,472 80 80 1,536 0.04 468.11 24 120 2.00 0.9 0.15 0.41 0.12 0.02 0.59 178 1,714 11,518 80 80 1,634 0.04 468.12 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 24.97 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.43 Maxwell Drywells UNIT TIME-PERCENT OF LAG 145.8 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.36 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.41 LOW LOSS RATE - PERCENT 83.93% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.13 0.41 0.11 0.02 0.53 158 1,792 11,554 80 80 1,712 0.04 468.12 26 130 2.17 0.9 0.15 0.41 0.12 0.02 0.59 178 1,890 11,599 81 81 1,810 0.04 468.13 27 135 2.25 0.9 0.15 0.41 0.12 0.02 0.59 178 1,988 11,644 81 81 1,907 0.04 468.14 28 140 2.33 0.9 0.15 0.41 0.12 0.02 0.59 178 2,085 11,688 81 81 2,004 0.05 468.15 29 145 2.42 0.9 0.15 0.41 0.12 0.02 0.59 178 2,182 11,733 81 81 2,101 0.05 468.15 30 150 2.50 0.9 0.15 0.41 0.12 0.02 0.59 178 2,279 11,777 82 82 2,197 0.05 468.16 31 155 2.58 0.9 0.15 0.41 0.12 0.02 0.59 178 2,376 11,822 82 82 2,293 0.05 468.17 32 160 2.67 0.9 0.15 0.41 0.12 0.02 0.59 178 2,472 11,866 82 82 2,389 0.05 468.17 33 165 2.75 1.0 0.16 0.41 0.14 0.03 0.66 198 2,587 11,919 83 83 2,505 0.06 468.18 34 170 2.83 1.0 0.16 0.41 0.14 0.03 0.66 198 2,703 11,972 83 83 2,619 0.06 468.19 35 175 2.92 1.0 0.16 0.41 0.14 0.03 0.66 198 2,817 12,025 84 84 2,734 0.06 468.20 36 180 3.00 1.0 0.16 0.41 0.14 0.03 0.66 198 2,932 12,077 84 84 2,848 0.07 468.21 37 185 3.08 1.0 0.16 0.41 0.14 0.03 0.66 198 3,046 12,130 84 84 2,962 0.07 468.22 38 190 3.17 1.1 0.18 0.41 0.15 0.03 0.73 218 3,180 12,191 85 85 3,095 0.07 468.22 39 195 3.25 1.1 0.18 0.41 0.15 0.03 0.73 218 3,313 12,253 85 85 3,228 0.07 468.23 40 200 3.33 1.1 0.18 0.41 0.15 0.03 0.73 218 3,446 12,314 86 86 3,360 0.08 468.24 41 205 3.42 1.2 0.20 0.41 0.16 0.03 0.79 238 3,598 12,383 86 86 3,512 0.08 468.25 42 210 3.50 1.3 0.21 0.41 0.18 0.03 0.86 257 3,769 12,462 87 87 3,683 0.08 468.27 43 215 3.58 1.4 0.23 0.41 0.19 0.04 0.92 277 3,960 12,550 87 87 3,873 0.09 468.28 44 220 3.67 1.4 0.23 0.41 0.19 0.04 0.92 277 4,150 12,637 88 88 4,062 0.09 468.29 45 225 3.75 1.5 0.24 0.41 0.21 0.04 0.99 297 4,359 12,733 88 88 4,271 0.10 468.31 46 230 3.83 1.5 0.24 0.41 0.21 0.04 0.99 297 4,568 12,829 89 89 4,479 0.10 468.33 47 235 3.92 1.6 0.26 0.41 0.22 0.04 1.06 317 4,796 12,934 90 90 4,706 0.11 468.34 48 240 4.00 1.6 0.26 0.41 0.22 0.04 1.06 317 5,023 13,038 91 91 4,932 0.11 468.36 49 245 4.08 1.7 0.28 0.41 0.23 0.04 1.12 337 5,269 13,151 91 91 5,177 0.12 468.38 50 250 4.17 1.8 0.29 0.41 0.25 0.05 1.19 356 5,534 13,273 92 92 5,442 0.12 468.40 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 24.97 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.43 Maxwell Drywells UNIT TIME-PERCENT OF LAG 145.8 Number 0 TOTAL ADJUSTED STORM RAIN (in)1.36 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.41 LOW LOSS RATE - PERCENT 83.93% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.31 0.41 0.26 0.05 1.25 376 5,818 13,404 93 93 5,725 0.13 468.42 52 260 4.33 2.0 0.33 0.41 0.27 0.05 1.32 396 6,121 13,543 94 94 6,027 0.14 468.44 53 265 4.42 2.1 0.34 0.41 0.29 0.06 1.39 416 6,443 13,691 95 95 6,347 0.15 468.46 54 270 4.50 2.1 0.34 0.41 0.29 0.06 1.39 416 6,763 13,838 96 96 6,667 0.15 468.48 55 275 4.58 2.2 0.36 0.41 0.30 0.06 1.45 436 7,103 13,994 97 97 7,006 0.16 468.51 56 280 4.67 2.3 0.38 0.41 0.32 0.06 1.52 455 7,461 14,159 98 98 7,363 0.17 468.53 57 285 4.75 2.4 0.39 0.41 0.33 0.06 1.58 475 7,838 14,332 100 100 7,739 0.18 468.56 58 290 4.83 2.4 0.39 0.41 0.33 0.06 1.58 475 8,214 14,505 101 101 8,113 0.19 468.59 59 295 4.92 2.5 0.41 0.41 0.34 0.07 1.65 495 8,608 14,686 102 102 8,506 0.20 468.62 60 300 5.00 2.6 0.42 0.41 0.36 0.02 0.41 122 8,628 14,695 102 102 8,526 0.20 468.62 61 305 5.08 3.1 0.51 0.41 0.42 0.10 2.46 738 9,264 14,987 104 104 9,160 0.21 468.67 62 310 5.17 3.6 0.59 0.41 0.49 0.18 4.51 1,354 10,514 15,562 108 108 10,406 0.24 468.76 63 315 5.25 3.9 0.64 0.41 0.53 0.23 5.75 1,724 12,130 16,305 113 113 12,017 0.28 468.87 64 320 5.33 4.2 0.69 0.41 0.58 0.28 6.98 2,094 14,111 17,175 119 119 13,991 0.32 469.01 65 325 5.42 4.7 0.77 0.41 0.64 0.36 9.03 2,710 16,702 18,058 125 125 16,576 0.38 469.14 66 330 5.50 5.6 0.91 0.41 0.77 0.51 12.73 3,820 20,396 19,316 134 134 20,262 0.47 469.32 67 335 5.58 1.9 0.31 0.41 0.26 0.05 1.25 376 20,638 19,399 135 135 20,503 0.47 469.33 68 340 5.67 0.9 0.15 0.41 0.12 0.02 0.59 178 20,681 19,414 135 135 20,546 0.47 469.33 69 345 5.75 0.6 0.10 0.41 0.08 0.02 0.40 119 20,665 19,408 135 135 20,531 0.47 469.33 70 350 5.83 0.5 0.08 0.41 0.07 0.01 0.33 99 20,630 19,396 135 135 20,495 0.47 469.33 71 355 5.92 0.3 0.05 0.41 0.04 0.01 0.20 59 20,554 19,370 135 135 20,420 0.47 469.33 72 360 6.00 0.2 0.03 0.41 0.03 0.01 0.13 40 20,459 19,338 134 134 20,325 0.47 469.32 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 123,263 cu-ft 1.36 in 96,384 cu-ft 469.33 ft 12.73 cfs 18.20 cf/min 6,554 cu-ft 0.30 in 0.62 acft 26,879 cu-ft 0.47 acft 20,546 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 24.97 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.20 LAG TIME - MINUTES 3.43 C 0.00378 Maxwell Drywells UNIT TIME-PERCENT OF LAG 437%Low Loss Rate (percent)83.93%Number 0 TOTAL ADJUSTED STORM RAIN (in)2.23 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.018 0.721 0.015 0.00 0.07 65 65 10,760 224 65 0 0.00 468.00 2 30 0.50 0.3 0.027 0.712 0.022 0.00 0.11 97 97 10,775 224 97 0 0.00 468.00 3 45 0.75 0.3 0.027 0.704 0.022 0.00 0.11 97 97 10,775 224 97 0 0.00 468.00 4 60 1.00 0.4 0.036 0.696 0.030 0.01 0.14 130 130 10,790 225 130 0 0.00 468.00 5 75 1.25 0.3 0.027 0.688 0.022 0.00 0.11 97 97 10,775 224 97 0 0.00 468.00 6 90 1.50 0.3 0.027 0.680 0.022 0.00 0.11 97 97 10,775 224 97 0 0.00 468.00 7 105 1.75 0.3 0.027 0.671 0.022 0.00 0.11 97 97 10,775 224 97 0 0.00 468.00 8 120 2.00 0.4 0.036 0.663 0.030 0.01 0.14 130 130 10,790 225 130 0 0.00 468.00 9 135 2.25 0.4 0.036 0.655 0.030 0.01 0.14 130 130 10,790 225 130 0 0.00 468.00 10 150 2.50 0.4 0.036 0.647 0.030 0.01 0.14 130 130 10,790 225 130 0 0.00 468.00 11 165 2.75 0.5 0.045 0.639 0.037 0.01 0.18 162 162 10,805 225 162 0 0.00 468.00 12 180 3.00 0.5 0.045 0.632 0.037 0.01 0.18 162 162 10,805 225 162 0 0.00 468.00 13 195 3.25 0.5 0.045 0.624 0.037 0.01 0.18 162 162 10,805 225 162 0 0.00 468.00 14 210 3.50 0.5 0.045 0.616 0.037 0.01 0.18 162 162 10,805 225 162 0 0.00 468.00 15 225 3.75 0.5 0.045 0.608 0.037 0.01 0.18 162 162 10,805 225 162 0 0.00 468.00 16 240 4.00 0.6 0.054 0.601 0.045 0.01 0.22 195 195 10,820 225 195 0 0.00 468.00 17 255 4.25 0.6 0.054 0.593 0.045 0.01 0.22 195 195 10,820 225 195 0 0.00 468.00 18 270 4.50 0.7 0.062 0.585 0.052 0.01 0.25 227 227 10,834 226 226 2 0.00 468.00 19 285 4.75 0.7 0.062 0.578 0.052 0.01 0.25 227 229 10,835 226 226 3 0.00 468.00 20 300 5.00 0.8 0.071 0.570 0.060 0.01 0.29 260 263 10,851 226 226 37 0.00 468.00 21 315 5.25 0.6 0.054 0.563 0.045 0.01 0.22 195 232 10,836 226 226 6 0.00 468.00 22 330 5.50 0.7 0.062 0.556 0.052 0.01 0.25 227 233 10,837 226 226 7 0.00 468.00 23 345 5.75 0.8 0.071 0.548 0.060 0.01 0.29 260 267 10,853 226 226 41 0.00 468.00 24 360 6.00 0.8 0.071 0.541 0.060 0.01 0.29 260 301 10,868 226 226 74 0.00 468.01 25 375 6.25 0.9 0.080 0.534 0.067 0.01 0.32 292 367 10,898 227 227 140 0.00 468.01 26 390 6.50 0.9 0.080 0.527 0.067 0.01 0.32 292 432 10,928 228 228 204 0.00 468.01 27 405 6.75 1.0 0.089 0.520 0.075 0.01 0.36 325 529 10,973 229 229 300 0.01 468.02 28 420 7.00 1.0 0.089 0.513 0.075 0.01 0.36 325 625 11,017 230 230 395 0.01 468.03 29 435 7.25 1.0 0.089 0.506 0.075 0.01 0.36 325 720 11,061 230 230 490 0.01 468.04 30 450 7.50 1.1 0.098 0.499 0.082 0.02 0.40 357 847 11,119 232 232 615 0.01 468.04 31 465 7.75 1.2 0.107 0.492 0.090 0.02 0.43 390 1,005 11,192 233 233 772 0.02 468.06 32 480 8.00 1.3 0.116 0.485 0.097 0.02 0.47 422 1,194 11,279 235 235 959 0.02 468.07 33 495 8.25 1.5 0.134 0.479 0.112 0.02 0.54 487 1,446 11,394 237 237 1,208 0.03 468.09 34 510 8.50 1.5 0.134 0.472 0.112 0.02 0.54 487 1,695 11,509 240 240 1,456 0.03 468.11 35 525 8.75 1.6 0.143 0.465 0.120 0.02 0.58 520 1,975 11,638 242 242 1,733 0.04 468.13 36 540 9.00 1.7 0.152 0.459 0.127 0.02 0.61 552 2,285 11,780 245 245 2,039 0.05 468.15 37 555 9.25 1.9 0.169 0.452 0.142 0.03 0.69 617 2,656 11,951 249 249 2,407 0.06 468.17 38 570 9.50 2.0 0.178 0.446 0.150 0.03 0.72 649 3,057 12,135 253 253 2,804 0.06 468.20 39 585 9.75 2.1 0.187 0.439 0.157 0.03 0.76 682 3,486 12,332 257 257 3,229 0.07 468.23 40 600 10.00 2.2 0.196 0.433 0.165 0.03 0.79 714 3,943 12,542 261 261 3,682 0.08 468.27 41 615 10.25 1.5 0.134 0.427 0.112 0.02 0.54 487 4,169 12,646 263 263 3,905 0.09 468.28 42 630 10.50 1.5 0.134 0.421 0.112 0.02 0.54 487 4,392 12,749 266 266 4,127 0.09 468.30 43 645 10.75 2.0 0.178 0.415 0.150 0.03 0.72 649 4,776 12,925 269 269 4,507 0.10 468.33 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 24.97 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.20 LAG TIME - MINUTES 3.43 C 0.00378 Maxwell Drywells UNIT TIME-PERCENT OF LAG 437%Low Loss Rate (percent)83.93%Number 0 TOTAL ADJUSTED STORM RAIN (in)2.23 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 44 660 11.00 2.0 0.178 0.409 0.150 0.03 0.72 649 5,156 13,100 273 273 4,883 0.11 468.35 45 675 11.25 1.9 0.169 0.403 0.142 0.03 0.69 617 5,500 13,258 276 276 5,224 0.12 468.38 46 690 11.50 1.9 0.169 0.397 0.142 0.03 0.69 617 5,841 13,415 279 279 5,562 0.13 468.40 47 705 11.75 1.7 0.152 0.391 0.127 0.02 0.61 552 6,114 13,540 282 282 5,832 0.13 468.42 48 720 12.00 1.8 0.161 0.385 0.135 0.03 0.65 584 6,416 13,679 285 285 6,131 0.14 468.45 49 735 12.25 2.5 0.223 0.379 0.187 0.04 0.90 812 6,943 13,921 290 290 6,653 0.15 468.48 50 750 12.50 2.6 0.232 0.373 0.195 0.04 0.94 844 7,497 14,176 295 295 7,202 0.17 468.52 51 765 12.75 2.8 0.250 0.368 0.210 0.04 1.01 909 8,111 14,458 301 301 7,810 0.18 468.57 52 780 13.00 2.9 0.259 0.362 0.217 0.04 1.05 942 8,751 14,752 307 307 8,444 0.19 468.61 53 795 13.25 3.4 0.303 0.357 0.255 0.05 1.23 1,104 9,548 15,118 315 315 9,233 0.21 468.67 54 810 13.50 3.4 0.303 0.351 0.255 0.05 1.23 1,104 10,337 15,481 323 323 10,014 0.23 468.73 55 825 13.75 2.3 0.205 0.346 0.172 0.03 0.83 747 10,761 15,676 327 327 10,435 0.24 468.76 56 840 14.00 2.3 0.205 0.341 0.172 0.03 0.83 747 11,181 15,869 331 331 10,851 0.25 468.79 57 855 14.25 2.7 0.241 0.336 0.202 0.04 0.97 877 11,728 16,120 336 336 11,392 0.26 468.83 58 870 14.50 2.6 0.232 0.331 0.195 0.04 0.94 844 12,236 16,353 341 341 11,895 0.27 468.86 59 885 14.75 2.6 0.232 0.325 0.195 0.04 0.94 844 12,739 16,585 346 346 12,394 0.28 468.90 60 900 15.00 2.5 0.223 0.320 0.187 0.04 0.90 812 13,206 16,799 350 350 12,856 0.30 468.93 61 915 15.25 2.4 0.214 0.316 0.180 0.03 0.87 779 13,635 16,996 354 354 13,281 0.30 468.96 62 930 15.50 2.3 0.205 0.311 0.172 0.03 0.83 747 14,028 17,147 357 357 13,670 0.31 468.99 63 945 15.75 1.9 0.169 0.306 0.142 0.03 0.69 617 14,287 17,235 359 359 13,928 0.32 469.01 64 960 16.00 1.9 0.169 0.301 0.142 0.03 0.69 617 14,545 17,323 361 361 14,184 0.33 469.02 65 975 16.25 0.4 0.036 0.297 0.030 0.01 0.14 130 14,314 17,244 359 359 13,955 0.32 469.01 66 990 16.50 0.4 0.036 0.292 0.030 0.01 0.14 130 14,085 17,166 358 358 13,727 0.32 469.00 67 1005 16.75 0.3 0.027 0.288 0.022 0.00 0.11 97 13,825 17,077 356 356 13,469 0.31 468.98 68 1020 17.00 0.3 0.027 0.283 0.022 0.00 0.11 97 13,566 16,965 353 353 13,213 0.30 468.96 69 1035 17.25 0.5 0.045 0.279 0.037 0.01 0.18 162 13,375 16,877 352 352 13,024 0.30 468.95 70 1050 17.50 0.5 0.045 0.275 0.037 0.01 0.18 162 13,186 16,790 350 350 12,836 0.29 468.93 71 1065 17.75 0.5 0.045 0.271 0.037 0.01 0.18 162 12,998 16,704 348 348 12,650 0.29 468.92 72 1080 18.00 0.4 0.036 0.267 0.030 0.01 0.14 130 12,780 16,604 346 346 12,434 0.29 468.90 73 1095 18.25 0.4 0.036 0.263 0.030 0.01 0.14 130 12,564 16,504 344 344 12,220 0.28 468.89 74 1110 18.50 0.4 0.036 0.259 0.030 0.01 0.14 130 12,350 16,406 342 342 12,009 0.28 468.87 75 1125 18.75 0.3 0.027 0.255 0.022 0.00 0.11 97 12,106 16,294 339 339 11,766 0.27 468.85 76 1140 19.00 0.2 0.018 0.252 0.015 0.00 0.07 65 11,831 16,168 337 337 11,495 0.26 468.83 77 1155 19.25 0.3 0.027 0.248 0.022 0.00 0.11 97 11,592 16,058 335 335 11,257 0.26 468.82 78 1170 19.50 0.4 0.036 0.245 0.030 0.01 0.14 130 11,387 15,963 333 333 11,055 0.25 468.80 79 1185 19.75 0.3 0.027 0.241 0.022 0.00 0.11 97 11,152 15,855 330 330 10,822 0.25 468.79 80 1200 20.00 0.2 0.018 0.238 0.015 0.00 0.07 65 10,887 15,733 328 328 10,559 0.24 468.77 81 1215 20.25 0.3 0.027 0.235 0.022 0.00 0.11 97 10,656 15,628 326 326 10,331 0.24 468.75 82 1230 20.50 0.3 0.027 0.232 0.022 0.00 0.11 97 10,428 15,523 323 323 10,105 0.23 468.73 83 1245 20.75 0.3 0.027 0.229 0.022 0.00 0.11 97 10,202 15,419 321 321 9,881 0.23 468.72 84 1260 21.00 0.2 0.018 0.226 0.015 0.00 0.07 65 9,946 15,301 319 319 9,627 0.22 468.70 85 1275 21.25 0.3 0.027 0.224 0.022 0.00 0.11 97 9,725 15,199 317 317 9,408 0.22 468.68 86 1290 21.50 0.2 0.018 0.221 0.015 0.00 0.07 65 9,473 15,084 314 314 9,159 0.21 468.66 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 24.97 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.20 LAG TIME - MINUTES 3.43 C 0.00378 Maxwell Drywells UNIT TIME-PERCENT OF LAG 437%Low Loss Rate (percent)83.93%Number 0 TOTAL ADJUSTED STORM RAIN (in)2.23 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 87 1305 21.75 0.3 0.027 0.219 0.022 0.00 0.11 97 9,256 14,984 312 312 8,944 0.21 468.65 88 1320 22.00 0.2 0.018 0.216 0.015 0.00 0.07 65 9,009 14,870 310 310 8,699 0.20 468.63 89 1335 22.25 0.3 0.027 0.214 0.022 0.00 0.11 97 8,796 14,773 308 308 8,489 0.19 468.62 90 1350 22.50 0.2 0.018 0.212 0.015 0.00 0.07 65 8,554 14,661 305 305 8,248 0.19 468.60 91 1365 22.75 0.2 0.018 0.210 0.015 0.00 0.07 65 8,313 14,551 303 303 8,010 0.18 468.58 92 1380 23.00 0.2 0.018 0.209 0.015 0.00 0.07 65 8,075 14,441 301 301 7,774 0.18 468.56 93 1395 23.25 0.2 0.018 0.207 0.015 0.00 0.07 65 7,839 14,333 299 299 7,540 0.17 468.55 94 1410 23.50 0.2 0.018 0.206 0.015 0.00 0.07 65 7,605 14,225 296 296 7,309 0.17 468.53 95 1425 23.75 0.2 0.018 0.205 0.015 0.00 0.07 65 7,374 14,119 294 294 7,080 0.16 468.51 96 1440 24.00 0.2 0.018 0.204 0.015 0.00 0.07 65 7,145 14,014 292 292 6,853 0.16 468.50 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 2.23 in 202,114 cu-ft 169,645 cu-ft 469.02 ft 1.23 cfs 25,617 cu-ft 17.79 cf/min 0.36 in 0.75 acft 32,470 cu-ft 0.33 acft 14,184 cu-ft Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL 10 YEAR BASIN BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 1 B COMMERCIAL 1.483 D 56 0.51 0.90 2 B PAVING/HARDSCAPE 2.574 D 56 0.51 1.00 3 B WATER FEATURE 6.423 D 56 0.51 1.00 4 B SF - LOW DENSITY 20.347 D 56 0.51 0.30 5 B SF - MEDIUM DENSITY 0.000 D 56 0.51 0.40 6 B SF - HIGH DENSITY 0.000 D 56 0.51 0.50 9 B LANDSCAPING 10.759 D 56 0.51 0.10 2,000 ft 1,000 ft 485.0 ft ELEVATION OF CONCENTRATION POINT 460.2 ft 0.02 100 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in BASIN CHARACTERISTICS:ELEVATION AREA 458.0 ft 279,800 sf 459.0 ft 304,405 sf PERCOLATION RATE (in/hr)0.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 BASIN B AMC NUMBER RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention DA-B Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)217,379 323,050 416,643 665,724 SOIL LOSSES (cu-ft)47,811 140,132 235,776 499,505 EFFECTIVE RAIN (in)1.12 1.21 1.20 1.10 FLOOD VOLUME (cu-ft)169,568 182,917 180,867 166,219 acre-ft)3.89 4.20 4.15 3.82 REQUIRED STORAGE (cu-ft)169,568 182,917 180,867 166,219 acre-ft)3.89 4.20 4.15 3.82 FACTOR OF SAFETY 1.72 1.60 1.61 1.76 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 75.02 64.49 13.72 MAXIMUM WSEL (ft)458.58 458.63 458.62 458.57 DEPTH (ft)0.58 0.63 0.62 0.57 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) BASIN B DA-B CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 41.586 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION 3] AREA - ACRES 4] L-FEET 5] L-MILES 2000 0.379 13] L*LCA/S^0.5 8.09 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.009 1000.00 12] S^0.5 0.189 65.5 485 460.2 24.8 0.02 17] 100% OF LAG-MINUTES 4.8 4.8 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.08 16] LAG TIME-MINUTES 18] 200% OF LAG-MINUTES RAINFALL DATA 9.6 NOTE: PEAK FLOW FOR THE 1-HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3-HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 292,016 6.70 Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 90%0.10 1.483 0.036 0.0035 DEVELOPED 0.1800 0.0064 B 56 0.51 100%0.05 2.574 0.062 0.0032 DEVELOPED 0.1000 0.0062 B 56 0.51 100%0.05 6.423 0.154 0.0079 DEVELOPED 0.1000 0.0154 B 56 0.51 30%0.37 20.347 0.489 0.1822 DEVELOPED 0.6600 0.3229 B 56 0.51 40%0.33 0.000 0.000 0.0000 DEVELOPED 0.5800 0.0000 B 56 0.51 50%0.28 0.000 0.000 0.0000 DEVELOPED 0.5000 0.0000 B 56 0.51 10%0.46 10.759 0.259 0.1201 DEVELOPED 0.8200 0.2121 SUM 41.586 SUM 0.3167 0.5631 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.158358458 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00293 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00293 0.16 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.3167 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II 24-(T/60))^1.55 + LAND USE COMMERCIAL PAVING/HARDSCAPE WATER FEATURE SF - LOW DENSITY SF - MEDIUM DENSITY SF - HIGH DENSITY LANDSCAPING Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 41.59 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 4.78 Maxwell Drywells UNIT TIME-PERCENT OF LAG 104.6 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.44 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.32 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.62 0.32 0.53 0.31 12.80 3,841 3,841 280,124 0 0 3,841 0.09 458.01 2 10 0.17 4.2 0.73 0.32 0.62 0.41 17.15 5,146 8,987 280,557 0 0 8,987 0.21 458.03 3 15 0.25 4.4 0.76 0.32 0.65 0.44 18.60 5,580 14,568 281,027 0 0 14,568 0.33 458.05 4 20 0.33 4.6 0.79 0.32 0.68 0.48 20.05 6,015 20,583 281,534 0 0 20,583 0.47 458.07 5 25 0.42 5.0 0.86 0.32 0.73 0.55 22.95 6,885 27,467 282,114 0 0 27,467 0.63 458.09 6 30 0.50 5.6 0.97 0.32 0.82 0.65 27.30 8,189 35,656 282,804 0 0 35,656 0.82 458.12 7 35 0.58 6.4 1.11 0.32 0.94 0.79 33.09 9,928 45,584 283,641 0 0 45,584 1.05 458.16 8 40 0.67 8.1 1.40 0.32 1.19 1.08 45.41 13,623 59,208 284,789 0 0 59,208 1.36 458.20 9 45 0.75 13.1 2.26 0.32 1.92 1.95 81.64 24,492 83,700 286,853 0 0 83,700 1.92 458.29 10 50 0.83 34.5 5.96 0.32 5.07 5.64 236.71 71,012 154,712 292,836 0 0 154,712 3.55 458.53 11 55 0.92 6.7 1.16 0.32 0.98 0.84 35.27 10,580 165,292 293,727 0 0 165,292 3.79 458.57 12 60 1.00 3.8 0.66 0.32 0.56 0.34 14.25 4,276 169,568 294,088 0 0 169,568 3.89 458.58 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 217,379 cu-ft SOIL LOSSES 47,811 cu-ft EFFECTIVE RAIN 1.12 in FLOOD VOLUME 3.89 acft FLOOD VOLUME 169,568 cu-ft REQUIRED STORAGE 3.89 REQUIRED STORAGE 169,568 cu-ft MAX WSEL 458.58 ft PEAK FLOW RATE 236.71 cfs TOTAL BASIN LOSSES 0 cu-ft AVERAGE PERCOLATION RATE 0.00 cf/min CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 41.59 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 4.78 Maxwell Drywells UNIT TIME-PERCENT OF LAG 104.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.32 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.33 0.32 0.28 0.02 0.72 215 215 279,818 0 0 215 0.00 458.00 2 10 0.17 1.3 0.33 0.32 0.28 0.02 0.72 215 431 279,836 0 0 431 0.01 458.00 3 15 0.25 1.1 0.28 0.32 0.24 0.04 1.78 533 964 279,881 0 0 964 0.02 458.00 4 20 0.33 1.5 0.39 0.32 0.33 0.07 2.87 862 1,825 279,954 0 0 1,825 0.04 458.01 5 25 0.42 1.5 0.39 0.32 0.33 0.07 2.87 862 2,687 280,026 0 0 2,687 0.06 458.01 6 30 0.50 1.8 0.46 0.32 0.39 0.15 6.10 1,831 4,518 280,181 0 0 4,518 0.10 458.02 7 35 0.58 1.5 0.39 0.32 0.33 0.07 2.87 862 5,379 280,253 0 0 5,379 0.12 458.02 8 40 0.67 1.8 0.46 0.32 0.39 0.15 6.10 1,831 7,210 280,407 0 0 7,210 0.17 458.02 9 45 0.75 1.8 0.46 0.32 0.39 0.15 6.10 1,831 9,040 280,562 0 0 9,040 0.21 458.03 10 50 0.83 1.5 0.39 0.32 0.33 0.07 2.87 862 9,902 280,634 0 0 9,902 0.23 458.03 11 55 0.92 1.6 0.41 0.32 0.35 0.09 3.95 1,185 11,086 280,734 0 0 11,086 0.25 458.04 12 60 1.00 1.8 0.46 0.32 0.39 0.15 6.10 1,831 12,917 280,888 0 0 12,917 0.30 458.04 13 65 1.08 2.2 0.56 0.32 0.48 0.25 10.41 3,123 16,040 281,152 0 0 16,040 0.37 458.05 14 70 1.17 2.2 0.56 0.32 0.48 0.25 10.41 3,123 19,163 281,415 0 0 19,163 0.44 458.07 15 75 1.25 2.2 0.56 0.32 0.48 0.25 10.41 3,123 22,286 281,678 0 0 22,286 0.51 458.08 16 80 1.33 2.0 0.51 0.32 0.44 0.20 8.26 2,477 24,762 281,886 0 0 24,762 0.57 458.08 17 85 1.42 2.6 0.67 0.32 0.57 0.35 14.72 4,415 29,177 282,258 0 0 29,177 0.67 458.10 18 90 1.50 2.7 0.69 0.32 0.59 0.38 15.79 4,738 33,915 282,658 0 0 33,915 0.78 458.12 19 95 1.58 2.4 0.62 0.32 0.52 0.30 12.56 3,769 37,684 282,975 0 0 37,684 0.87 458.13 20 100 1.67 2.7 0.69 0.32 0.59 0.38 15.79 4,738 42,423 283,374 0 0 42,423 0.97 458.15 21 105 1.75 3.3 0.85 0.32 0.72 0.53 22.25 6,676 49,099 283,937 0 0 49,099 1.13 458.17 22 110 1.83 3.1 0.80 0.32 0.68 0.48 20.10 6,030 55,129 284,445 0 0 55,129 1.27 458.19 23 115 1.92 2.9 0.74 0.32 0.63 0.43 17.95 5,384 60,513 284,899 0 0 60,513 1.39 458.21 24 120 2.00 3.0 0.77 0.32 0.65 0.45 19.02 5,707 66,221 285,380 0 0 66,221 1.52 458.23 25 125 2.08 3.1 0.80 0.32 0.68 0.48 20.10 6,030 72,251 285,888 0 0 72,251 1.66 458.25 Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 41.59 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 4.78 Maxwell Drywells UNIT TIME-PERCENT OF LAG 104.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.32 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 1.08 0.32 0.92 0.76 31.95 9,584 81,835 286,695 0 0 81,835 1.88 458.28 27 135 2.25 5.0 1.28 0.32 1.09 0.97 40.56 12,168 94,003 287,721 0 0 94,003 2.16 458.32 28 140 2.33 3.5 0.90 0.32 0.76 0.58 24.41 7,322 101,326 288,338 0 0 101,326 2.33 458.35 29 145 2.42 6.8 1.75 0.32 1.48 1.43 59.94 17,983 119,309 289,853 0 0 119,309 2.74 458.41 30 150 2.50 7.3 1.87 0.32 1.59 1.56 65.33 19,598 138,907 291,504 0 0 138,907 3.19 458.48 31 155 2.58 8.2 2.11 0.32 1.79 1.79 75.02 22,506 161,413 293,400 0 0 161,413 3.71 458.55 32 160 2.67 5.9 1.52 0.32 1.29 1.20 50.25 15,076 176,489 294,671 0 0 176,489 4.05 458.60 33 165 2.75 2.0 0.51 0.32 0.44 0.20 8.26 2,477 178,965 294,879 0 0 178,965 4.11 458.61 34 170 2.83 1.8 0.46 0.32 0.39 0.15 6.10 1,831 180,796 295,034 0 0 180,796 4.15 458.62 35 175 2.92 1.8 0.46 0.32 0.39 0.15 6.10 1,831 182,627 295,188 0 0 182,627 4.19 458.63 36 180 3.00 0.6 0.15 0.32 0.13 0.02 0.97 291 182,917 295,212 0 0 182,917 4.20 458.63 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 140,132 cu-ft 2.14 in 323,050 cu-ft 458.63 ft 75.02 cfs 0 cu-ft 0.00 cf/min 1.21 in 4.20 acft 182,917 cu-ft 4.20 acft 182,917 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 41.59 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 4.78 Maxwell Drywells UNIT TIME-PERCENT OF LAG 104.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.32 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.17 0.32 0.14 0.02 1.04 312 312 279,826 0 0 312 0.01 458.00 2 10 0.17 0.6 0.20 0.32 0.17 0.03 1.25 375 687 279,858 0 0 687 0.02 458.00 3 15 0.25 0.6 0.20 0.32 0.17 0.03 1.25 375 1,062 279,890 0 0 1,062 0.02 458.00 4 20 0.33 0.6 0.20 0.32 0.17 0.03 1.25 375 1,437 279,921 0 0 1,437 0.03 458.00 5 25 0.42 0.6 0.20 0.32 0.17 0.03 1.25 375 1,812 279,953 0 0 1,812 0.04 458.01 6 30 0.50 0.7 0.23 0.32 0.20 0.03 1.46 437 2,250 279,990 0 0 2,250 0.05 458.01 7 35 0.58 0.7 0.23 0.32 0.20 0.03 1.46 437 2,687 280,026 0 0 2,687 0.06 458.01 8 40 0.67 0.7 0.23 0.32 0.20 0.03 1.46 437 3,125 280,063 0 0 3,125 0.07 458.01 9 45 0.75 0.7 0.23 0.32 0.20 0.03 1.46 437 3,562 280,100 0 0 3,562 0.08 458.01 10 50 0.83 0.7 0.23 0.32 0.20 0.03 1.46 437 4,000 280,137 0 0 4,000 0.09 458.01 11 55 0.92 0.7 0.23 0.32 0.20 0.03 1.46 437 4,437 280,174 0 0 4,437 0.10 458.02 12 60 1.00 0.8 0.26 0.32 0.23 0.04 1.67 500 4,937 280,216 0 0 4,937 0.11 458.02 13 65 1.08 0.8 0.26 0.32 0.23 0.04 1.67 500 5,437 280,258 0 0 5,437 0.12 458.02 14 70 1.17 0.8 0.26 0.32 0.23 0.04 1.67 500 5,937 280,300 0 0 5,937 0.14 458.02 15 75 1.25 0.8 0.26 0.32 0.23 0.04 1.67 500 6,437 280,342 0 0 6,437 0.15 458.02 16 80 1.33 0.8 0.26 0.32 0.23 0.04 1.67 500 6,937 280,385 0 0 6,937 0.16 458.02 17 85 1.42 0.8 0.26 0.32 0.23 0.04 1.67 500 7,437 280,427 0 0 7,437 0.17 458.03 18 90 1.50 0.8 0.26 0.32 0.23 0.04 1.67 500 7,937 280,469 0 0 7,937 0.18 458.03 19 95 1.58 0.8 0.26 0.32 0.23 0.04 1.67 500 8,437 280,511 0 0 8,437 0.19 458.03 20 100 1.67 0.8 0.26 0.32 0.23 0.04 1.67 500 8,937 280,553 0 0 8,937 0.21 458.03 21 105 1.75 0.8 0.26 0.32 0.23 0.04 1.67 500 9,437 280,595 0 0 9,437 0.22 458.03 22 110 1.83 0.8 0.26 0.32 0.23 0.04 1.67 500 9,937 280,637 0 0 9,937 0.23 458.03 23 115 1.92 0.8 0.26 0.32 0.23 0.04 1.67 500 10,437 280,679 0 0 10,437 0.24 458.04 24 120 2.00 0.9 0.30 0.32 0.25 0.04 1.87 562 10,999 280,727 0 0 10,999 0.25 458.04 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 41.59 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 4.78 Maxwell Drywells UNIT TIME-PERCENT OF LAG 104.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.32 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.26 0.32 0.23 0.04 1.67 500 11,499 280,769 0 0 11,499 0.26 458.04 26 130 2.17 0.9 0.30 0.32 0.25 0.04 1.87 562 12,062 280,816 0 0 12,062 0.28 458.04 27 135 2.25 0.9 0.30 0.32 0.25 0.04 1.87 562 12,624 280,864 0 0 12,624 0.29 458.04 28 140 2.33 0.9 0.30 0.32 0.25 0.04 1.87 562 13,187 280,911 0 0 13,187 0.30 458.05 29 145 2.42 0.9 0.30 0.32 0.25 0.04 1.87 562 13,749 280,958 0 0 13,749 0.32 458.05 30 150 2.50 0.9 0.30 0.32 0.25 0.04 1.87 562 14,312 281,006 0 0 14,312 0.33 458.05 31 155 2.58 0.9 0.30 0.32 0.25 0.04 1.87 562 14,874 281,053 0 0 14,874 0.34 458.05 32 160 2.67 0.9 0.30 0.32 0.25 0.04 1.87 562 15,437 281,101 0 0 15,437 0.35 458.05 33 165 2.75 1.0 0.33 0.32 0.28 0.01 0.61 182 15,619 281,116 0 0 15,619 0.36 458.05 34 170 2.83 1.0 0.33 0.32 0.28 0.01 0.61 182 15,801 281,131 0 0 15,801 0.36 458.05 35 175 2.92 1.0 0.33 0.32 0.28 0.01 0.61 182 15,983 281,147 0 0 15,983 0.37 458.05 36 180 3.00 1.0 0.33 0.32 0.28 0.01 0.61 182 16,165 281,162 0 0 16,165 0.37 458.06 37 185 3.08 1.0 0.33 0.32 0.28 0.01 0.61 182 16,348 281,177 0 0 16,348 0.38 458.06 38 190 3.17 1.1 0.36 0.32 0.31 0.05 2.00 599 16,946 281,228 0 0 16,946 0.39 458.06 39 195 3.25 1.1 0.36 0.32 0.31 0.05 2.00 599 17,545 281,278 0 0 17,545 0.40 458.06 40 200 3.33 1.1 0.36 0.32 0.31 0.05 2.00 599 18,144 281,329 0 0 18,144 0.42 458.06 41 205 3.42 1.2 0.40 0.32 0.34 0.08 3.38 1,015 19,160 281,414 0 0 19,160 0.44 458.07 42 210 3.50 1.3 0.43 0.32 0.37 0.11 4.77 1,432 20,592 281,535 0 0 20,592 0.47 458.07 43 215 3.58 1.4 0.46 0.32 0.39 0.15 6.16 1,849 22,441 281,691 0 0 22,441 0.52 458.08 44 220 3.67 1.4 0.46 0.32 0.39 0.15 6.16 1,849 24,289 281,847 0 0 24,289 0.56 458.08 45 225 3.75 1.5 0.50 0.32 0.42 0.18 7.55 2,265 26,555 282,037 0 0 26,555 0.61 458.09 46 230 3.83 1.5 0.50 0.32 0.42 0.18 7.55 2,265 28,820 282,228 0 0 28,820 0.66 458.10 47 235 3.92 1.6 0.53 0.32 0.45 0.21 8.94 2,682 31,502 282,454 0 0 31,502 0.72 458.11 48 240 4.00 1.6 0.53 0.32 0.45 0.21 8.94 2,682 34,184 282,680 0 0 34,184 0.78 458.12 49 245 4.08 1.7 0.56 0.32 0.48 0.25 10.33 3,099 37,283 282,941 0 0 37,283 0.86 458.13 50 250 4.17 1.8 0.60 0.32 0.51 0.28 11.72 3,515 40,798 283,238 0 0 40,798 0.94 458.14 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 41.59 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 4.78 Maxwell Drywells UNIT TIME-PERCENT OF LAG 104.6 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.32 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.63 0.32 0.53 0.31 13.11 3,932 44,730 283,569 0 0 44,730 1.03 458.15 52 260 4.33 2.0 0.66 0.32 0.56 0.35 14.50 4,349 49,079 283,935 0 0 49,079 1.13 458.17 53 265 4.42 2.1 0.70 0.32 0.59 0.38 15.88 4,765 53,844 284,337 0 0 53,844 1.24 458.18 54 270 4.50 2.1 0.70 0.32 0.59 0.38 15.88 4,765 58,609 284,738 0 0 58,609 1.35 458.20 55 275 4.58 2.2 0.73 0.32 0.62 0.41 17.27 5,182 63,791 285,175 0 0 63,791 1.46 458.22 56 280 4.67 2.3 0.76 0.32 0.65 0.45 18.66 5,599 69,390 285,647 0 0 69,390 1.59 458.24 57 285 4.75 2.4 0.79 0.32 0.68 0.48 20.05 6,015 75,405 286,154 0 0 75,405 1.73 458.26 58 290 4.83 2.4 0.79 0.32 0.68 0.48 20.05 6,015 81,420 286,660 0 0 81,420 1.87 458.28 59 295 4.92 2.5 0.83 0.32 0.70 0.51 21.44 6,432 87,852 287,202 0 0 87,852 2.02 458.30 60 300 5.00 2.6 0.86 0.32 0.73 0.54 22.83 6,848 94,701 287,779 0 0 94,701 2.17 458.32 61 305 5.08 3.1 1.03 0.32 0.87 0.71 29.77 8,932 103,632 288,532 0 0 103,632 2.38 458.35 62 310 5.17 3.6 1.19 0.32 1.01 0.88 36.72 11,015 114,647 289,460 0 0 114,647 2.63 458.39 63 315 5.25 3.9 1.29 0.32 1.10 0.97 40.88 12,265 126,912 290,493 0 0 126,912 2.91 458.43 64 320 5.33 4.2 1.39 0.32 1.18 1.07 45.05 13,515 140,427 291,632 0 0 140,427 3.22 458.48 65 325 5.42 4.7 1.56 0.32 1.32 1.24 51.99 15,598 156,025 292,947 0 0 156,025 3.58 458.53 66 330 5.50 5.6 1.85 0.32 1.58 1.54 64.49 19,348 175,373 294,577 0 0 175,373 4.03 458.60 67 335 5.58 1.9 0.63 0.32 0.53 0.31 13.11 3,932 179,305 294,908 0 0 179,305 4.12 458.61 68 340 5.67 0.9 0.30 0.32 0.25 0.04 1.87 562 179,867 294,955 0 0 179,867 4.13 458.62 69 345 5.75 0.6 0.20 0.32 0.17 0.03 1.25 375 180,242 294,987 0 0 180,242 4.14 458.62 70 350 5.83 0.5 0.17 0.32 0.14 0.02 1.04 312 180,555 295,013 0 0 180,555 4.14 458.62 71 355 5.92 0.3 0.10 0.32 0.08 0.01 0.62 187 180,742 295,029 0 0 180,742 4.15 458.62 72 360 6.00 0.2 0.07 0.32 0.06 0.01 0.42 125 180,867 295,040 0 0 180,867 4.15 458.62 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 416,643 cu-ft 2.76 in 235,776 cu-ft 458.62 ft 64.49 cfs 0.00 cf/min 0 cu-ft 1.20 in 4.15 acft 180,867 cu-ft 4.15 acft 180,867 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 41.59 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.16 LAG TIME - MINUTES 4.78 C 0.00293 Maxwell Drywells UNIT TIME-PERCENT OF LAG 314%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.035 0.559 0.030 0.01 0.22 200 200 279,817 0 0 200 0.00 458.00 2 30 0.50 0.3 0.053 0.553 0.045 0.01 0.33 300 499 279,842 0 0 499 0.01 458.00 3 45 0.75 0.3 0.053 0.546 0.045 0.01 0.33 300 799 279,867 0 0 799 0.02 458.00 4 60 1.00 0.4 0.071 0.540 0.060 0.01 0.44 399 1,198 279,901 0 0 1,198 0.03 458.00 5 75 1.25 0.3 0.053 0.534 0.045 0.01 0.33 300 1,498 279,926 0 0 1,498 0.03 458.01 6 90 1.50 0.3 0.053 0.527 0.045 0.01 0.33 300 1,797 279,951 0 0 1,797 0.04 458.01 7 105 1.75 0.3 0.053 0.521 0.045 0.01 0.33 300 2,097 279,977 0 0 2,097 0.05 458.01 8 120 2.00 0.4 0.071 0.515 0.060 0.01 0.44 399 2,496 280,010 0 0 2,496 0.06 458.01 9 135 2.25 0.4 0.071 0.508 0.060 0.01 0.44 399 2,896 280,044 0 0 2,896 0.07 458.01 10 150 2.50 0.4 0.071 0.502 0.060 0.01 0.44 399 3,295 280,078 0 0 3,295 0.08 458.01 11 165 2.75 0.5 0.088 0.496 0.075 0.01 0.55 499 3,795 280,120 0 0 3,795 0.09 458.01 12 180 3.00 0.5 0.088 0.490 0.075 0.01 0.55 499 4,294 280,162 0 0 4,294 0.10 458.01 13 195 3.25 0.5 0.088 0.484 0.075 0.01 0.55 499 4,793 280,204 0 0 4,793 0.11 458.02 14 210 3.50 0.5 0.088 0.478 0.075 0.01 0.55 499 5,293 280,246 0 0 5,293 0.12 458.02 15 225 3.75 0.5 0.088 0.472 0.075 0.01 0.55 499 5,792 280,288 0 0 5,792 0.13 458.02 16 240 4.00 0.6 0.106 0.466 0.090 0.02 0.67 599 6,391 280,338 0 0 6,391 0.15 458.02 17 255 4.25 0.6 0.106 0.460 0.090 0.02 0.67 599 6,990 280,389 0 0 6,990 0.16 458.02 18 270 4.50 0.7 0.123 0.454 0.105 0.02 0.78 699 7,689 280,448 0 0 7,689 0.18 458.03 19 285 4.75 0.7 0.123 0.448 0.105 0.02 0.78 699 8,388 280,507 0 0 8,388 0.19 458.03 20 300 5.00 0.8 0.141 0.443 0.120 0.02 0.89 799 9,187 280,574 0 0 9,187 0.21 458.03 21 315 5.25 0.6 0.106 0.437 0.090 0.02 0.67 599 9,786 280,625 0 0 9,786 0.22 458.03 22 330 5.50 0.7 0.123 0.431 0.105 0.02 0.78 699 10,485 280,683 0 0 10,485 0.24 458.04 23 345 5.75 0.8 0.141 0.426 0.120 0.02 0.89 799 11,284 280,751 0 0 11,284 0.26 458.04 24 360 6.00 0.8 0.141 0.420 0.120 0.02 0.89 799 12,083 280,818 0 0 12,083 0.28 458.04 25 375 6.25 0.9 0.159 0.414 0.135 0.02 1.00 899 12,982 280,894 0 0 12,982 0.30 458.04 26 390 6.50 0.9 0.159 0.409 0.135 0.02 1.00 899 13,880 280,970 0 0 13,880 0.32 458.05 27 405 6.75 1.0 0.176 0.403 0.150 0.03 1.11 999 14,879 281,054 0 0 14,879 0.34 458.05 28 420 7.00 1.0 0.176 0.398 0.150 0.03 1.11 999 15,878 281,138 0 0 15,878 0.36 458.05 29 435 7.25 1.0 0.176 0.392 0.150 0.03 1.11 999 16,876 281,222 0 0 16,876 0.39 458.06 30 450 7.50 1.1 0.194 0.387 0.165 0.03 1.22 1,098 17,975 281,315 0 0 17,975 0.41 458.06 31 465 7.75 1.2 0.212 0.382 0.180 0.03 1.33 1,198 19,173 281,415 0 0 19,173 0.44 458.07 32 480 8.00 1.3 0.229 0.377 0.195 0.03 1.44 1,298 20,471 281,525 0 0 20,471 0.47 458.07 33 495 8.25 1.5 0.265 0.371 0.225 0.04 1.66 1,498 21,969 281,651 0 0 21,969 0.50 458.08 34 510 8.50 1.5 0.265 0.366 0.225 0.04 1.66 1,498 23,467 281,777 0 0 23,467 0.54 458.08 35 525 8.75 1.6 0.282 0.361 0.240 0.04 1.78 1,598 25,064 281,912 0 0 25,064 0.58 458.09 36 540 9.00 1.7 0.300 0.356 0.255 0.04 1.89 1,698 26,762 282,055 0 0 26,762 0.61 458.09 37 555 9.25 1.9 0.335 0.351 0.285 0.05 2.11 1,897 28,659 282,215 0 0 28,659 0.66 458.10 38 570 9.50 2.0 0.353 0.346 0.300 0.01 0.29 260 28,919 282,237 0 0 28,919 0.66 458.10 39 585 9.75 2.1 0.370 0.341 0.315 0.03 1.24 1,112 30,031 282,330 0 0 30,031 0.69 458.10 40 600 10.00 2.2 0.388 0.336 0.330 0.05 2.18 1,963 31,994 282,496 0 0 31,994 0.73 458.11 41 615 10.25 1.5 0.265 0.331 0.225 0.04 1.66 1,498 33,492 282,622 0 0 33,492 0.77 458.11 42 630 10.50 1.5 0.265 0.326 0.225 0.04 1.66 1,498 34,989 282,748 0 0 34,989 0.80 458.12 43 645 10.75 2.0 0.353 0.322 0.300 0.03 1.31 1,175 36,164 282,847 0 0 36,164 0.83 458.12 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 41.59 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.16 LAG TIME - MINUTES 4.78 C 0.00293 Maxwell Drywells UNIT TIME-PERCENT OF LAG 314%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 44 660 11.00 2.0 0.353 0.317 0.300 0.04 1.50 1,353 37,517 282,961 0 0 37,517 0.86 458.13 45 675 11.25 1.9 0.335 0.312 0.285 0.02 0.96 863 38,380 283,034 0 0 38,380 0.88 458.13 46 690 11.50 1.9 0.335 0.308 0.285 0.03 1.15 1,037 39,416 283,121 0 0 39,416 0.90 458.13 47 705 11.75 1.7 0.300 0.303 0.255 0.04 1.89 1,698 41,114 283,264 0 0 41,114 0.94 458.14 48 720 12.00 1.8 0.318 0.299 0.270 0.02 0.79 713 41,827 283,324 0 0 41,827 0.96 458.14 49 735 12.25 2.5 0.441 0.294 0.375 0.15 6.16 5,541 47,368 283,791 0 0 47,368 1.09 458.16 50 750 12.50 2.6 0.459 0.290 0.390 0.17 7.08 6,373 53,742 284,328 0 0 53,742 1.23 458.18 51 765 12.75 2.8 0.494 0.285 0.420 0.21 8.74 7,869 61,611 284,991 0 0 61,611 1.41 458.21 52 780 13.00 2.9 0.512 0.281 0.435 0.23 9.66 8,697 70,308 285,724 0 0 70,308 1.61 458.24 53 795 13.25 3.4 0.600 0.277 0.510 0.32 13.54 12,186 82,494 286,751 0 0 82,494 1.89 458.28 54 810 13.50 3.4 0.600 0.273 0.510 0.33 13.72 12,345 94,839 287,791 0 0 94,839 2.18 458.32 55 825 13.75 2.3 0.406 0.269 0.345 0.14 5.75 5,178 100,017 288,227 0 0 100,017 2.30 458.34 56 840 14.00 2.3 0.406 0.264 0.345 0.14 5.92 5,332 105,349 288,677 0 0 105,349 2.42 458.36 57 855 14.25 2.7 0.476 0.260 0.405 0.22 9.05 8,147 113,496 289,363 0 0 113,496 2.61 458.39 58 870 14.50 2.6 0.459 0.256 0.390 0.20 8.48 7,632 121,128 290,006 0 0 121,128 2.78 458.41 59 885 14.75 2.6 0.459 0.253 0.390 0.21 8.64 7,779 128,907 290,662 0 0 128,907 2.96 458.44 60 900 15.00 2.5 0.441 0.249 0.375 0.19 8.07 7,259 136,166 291,273 0 0 136,166 3.13 458.47 61 915 15.25 2.4 0.423 0.245 0.360 0.18 7.49 6,737 142,904 291,841 0 0 142,904 3.28 458.49 62 930 15.50 2.3 0.406 0.241 0.345 0.16 6.90 6,213 149,117 292,364 0 0 149,117 3.42 458.51 63 945 15.75 1.9 0.335 0.237 0.285 0.10 4.10 3,689 152,806 292,675 0 0 152,806 3.51 458.52 64 960 16.00 1.9 0.335 0.234 0.285 0.10 4.25 3,826 156,632 292,998 0 0 156,632 3.60 458.54 65 975 16.25 0.4 0.071 0.230 0.060 0.01 0.44 399 157,032 293,031 0 0 157,032 3.60 458.54 66 990 16.50 0.4 0.071 0.227 0.060 0.01 0.44 399 157,431 293,065 0 0 157,431 3.61 458.54 67 1005 16.75 0.3 0.053 0.223 0.045 0.01 0.33 300 157,731 293,090 0 0 157,731 3.62 458.54 68 1020 17.00 0.3 0.053 0.220 0.045 0.01 0.33 300 158,030 293,115 0 0 158,030 3.63 458.54 69 1035 17.25 0.5 0.088 0.217 0.075 0.01 0.55 499 158,530 293,158 0 0 158,530 3.64 458.54 70 1050 17.50 0.5 0.088 0.213 0.075 0.01 0.55 499 159,029 293,200 0 0 159,029 3.65 458.54 71 1065 17.75 0.5 0.088 0.210 0.075 0.01 0.55 499 159,528 293,242 0 0 159,528 3.66 458.55 72 1080 18.00 0.4 0.071 0.207 0.060 0.01 0.44 399 159,928 293,275 0 0 159,928 3.67 458.55 73 1095 18.25 0.4 0.071 0.204 0.060 0.01 0.44 399 160,327 293,309 0 0 160,327 3.68 458.55 74 1110 18.50 0.4 0.071 0.201 0.060 0.01 0.44 399 160,726 293,343 0 0 160,726 3.69 458.55 75 1125 18.75 0.3 0.053 0.198 0.045 0.01 0.33 300 161,026 293,368 0 0 161,026 3.70 458.55 76 1140 19.00 0.2 0.035 0.195 0.030 0.01 0.22 200 161,226 293,385 0 0 161,226 3.70 458.55 77 1155 19.25 0.3 0.053 0.193 0.045 0.01 0.33 300 161,525 293,410 0 0 161,525 3.71 458.55 78 1170 19.50 0.4 0.071 0.190 0.060 0.01 0.44 399 161,925 293,444 0 0 161,925 3.72 458.55 79 1185 19.75 0.3 0.053 0.187 0.045 0.01 0.33 300 162,224 293,469 0 0 162,224 3.72 458.56 80 1200 20.00 0.2 0.035 0.185 0.030 0.01 0.22 200 162,424 293,486 0 0 162,424 3.73 458.56 81 1215 20.25 0.3 0.053 0.182 0.045 0.01 0.33 300 162,724 293,511 0 0 162,724 3.74 458.56 82 1230 20.50 0.3 0.053 0.180 0.045 0.01 0.33 300 163,023 293,536 0 0 163,023 3.74 458.56 83 1245 20.75 0.3 0.053 0.178 0.045 0.01 0.33 300 163,323 293,561 0 0 163,323 3.75 458.56 84 1260 21.00 0.2 0.035 0.176 0.030 0.01 0.22 200 163,523 293,578 0 0 163,523 3.75 458.56 85 1275 21.25 0.3 0.053 0.173 0.045 0.01 0.33 300 163,822 293,603 0 0 163,822 3.76 458.56 86 1290 21.50 0.2 0.035 0.171 0.030 0.01 0.22 200 164,022 293,620 0 0 164,022 3.77 458.56 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 41.59 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.16 LAG TIME - MINUTES 4.78 C 0.00293 Maxwell Drywells UNIT TIME-PERCENT OF LAG 314%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 87 1305 21.75 0.3 0.053 0.170 0.045 0.01 0.33 300 164,321 293,646 0 0 164,321 3.77 458.56 88 1320 22.00 0.2 0.035 0.168 0.030 0.01 0.22 200 164,521 293,662 0 0 164,521 3.78 458.56 89 1335 22.25 0.3 0.053 0.166 0.045 0.01 0.33 300 164,821 293,688 0 0 164,821 3.78 458.56 90 1350 22.50 0.2 0.035 0.165 0.030 0.01 0.22 200 165,020 293,704 0 0 165,020 3.79 458.57 91 1365 22.75 0.2 0.035 0.163 0.030 0.01 0.22 200 165,220 293,721 0 0 165,220 3.79 458.57 92 1380 23.00 0.2 0.035 0.162 0.030 0.01 0.22 200 165,420 293,738 0 0 165,420 3.80 458.57 93 1395 23.25 0.2 0.035 0.161 0.030 0.01 0.22 200 165,620 293,755 0 0 165,620 3.80 458.57 94 1410 23.50 0.2 0.035 0.160 0.030 0.01 0.22 200 165,819 293,772 0 0 165,819 3.81 458.57 95 1425 23.75 0.2 0.035 0.159 0.030 0.01 0.22 200 166,019 293,789 0 0 166,019 3.81 458.57 96 1440 24.00 0.2 0.035 0.158 0.030 0.01 0.22 200 166,219 293,805 0 0 166,219 3.82 458.57 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 4.41 in 665,724 cu-ft 499,505 cu-ft 458.57 ft 13.72 cfs 0 cu-ft 0.00 cf/min 1.10 in 3.82 acft 166,219 cu-ft 3.82 acft 166,219 cu-ft Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL BASIN B BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 1.455 D 56 0.51 1.00 5 B SF - MEDIUM DENSITY 4.092 D 56 0.51 0.40 6 B SF - HIGH DENSITY 2.159 D 56 0.51 0.50 9 B LANDSCAPING 2.485 D 56 0.51 0.10 1,350 ft 675 ft 464.0 ft ELEVATION OF CONCENTRATION POINT 455.0 ft 0.02 100 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in BASIN CHARACTERISTICS:ELEVATION AREA 452.0 ft 25,035 sf 453.0 ft 28,965 sf 454.0 ft 33,060 sf PERCOLATION RATE (in/hr)1.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 BASIN C AMC NUMBER RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention DA-C Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)53,271 79,166 102,102 163,141 SOIL LOSSES (cu-ft)11,503 33,734 57,155 121,656 EFFECTIVE RAIN (in)1.13 1.23 1.21 1.12 FLOOD VOLUME (cu-ft)41,768 45,432 44,947 41,485 acre-ft)0.96 1.04 1.03 0.95 REQUIRED STORAGE (cu-ft)39,500 39,121 34,975 19,901 acre-ft)0.91 0.90 0.80 0.46 FACTOR OF SAFETY 1.47 1.48 1.66 2.91 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 18.44 15.86 3.41 MAXIMUM WSEL (ft)453.40 453.39 453.26 452.74 DEPTH (ft)1.40 1.39 1.26 0.74 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days)0.8 0.9 1.1 1.1 BASIN C DA-C CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 10.191 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION 3] AREA - ACRES 4] L-FEET 5] L-MILES 1350 0.256 13] L*LCA/S^0.5 5.93 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.006 675.00 12] S^0.5 0.128 35.2 464 455 9 0.02 17] 100% OF LAG-MINUTES 4.0 4.0 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.07 16] LAG TIME-MINUTES 18] 200% OF LAG-MINUTES RAINFALL DATA 8.0 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. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 57,966 1.33 Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 1.455 0.143 0.0073 DEVELOPED 0.1000 0.0143 B 56 0.51 40%0.33 4.092 0.402 0.1311 DEVELOPED 0.5800 0.2329 B 56 0.51 50%0.28 2.159 0.212 0.0594 DEVELOPED 0.5000 0.1059 B 56 0.51 10%0.46 2.485 0.244 0.1132 DEVELOPED 0.8200 0.2000 SUM 10.191 SUM 0.3109 0.5530 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.155466676 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00288 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00288 0.16 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.3109 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE SF - MEDIUM DENSITY SF - HIGH DENSITY LANDSCAPING Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 10.19 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.99 Maxwell Drywells UNIT TIME-PERCENT OF LAG 125.3 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.44 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.31 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.62 0.31 0.53 0.31 3.20 959 959 25,175 175 175 784 0.02 452.03 2 10 0.17 4.2 0.73 0.31 0.62 0.41 4.26 1,279 2,063 25,336 176 176 1,887 0.04 452.07 3 15 0.25 4.4 0.76 0.31 0.65 0.45 4.62 1,385 3,273 25,512 177 177 3,095 0.07 452.11 4 20 0.33 4.6 0.79 0.31 0.68 0.48 4.97 1,492 4,587 25,703 178 178 4,409 0.10 452.16 5 25 0.42 5.0 0.86 0.31 0.73 0.55 5.68 1,705 6,114 25,926 180 180 5,934 0.14 452.22 6 30 0.50 5.6 0.97 0.31 0.82 0.66 6.75 2,025 7,958 26,194 182 182 7,777 0.18 452.29 7 35 0.58 6.4 1.11 0.31 0.94 0.79 8.17 2,451 10,227 26,525 184 184 10,043 0.23 452.37 8 40 0.67 8.1 1.40 0.31 1.19 1.09 11.19 3,356 13,399 26,987 187 187 13,212 0.30 452.49 9 45 0.75 13.1 2.26 0.31 1.92 1.95 20.07 6,020 19,232 27,837 193 193 19,039 0.44 452.71 10 50 0.83 34.5 5.96 0.31 5.07 5.65 58.07 17,420 36,458 30,218 210 210 36,249 0.83 453.30 11 55 0.92 6.7 1.16 0.31 0.98 0.85 8.70 2,611 38,859 30,535 212 212 38,647 0.89 453.38 12 60 1.00 3.8 0.66 0.31 0.56 0.35 3.55 1,066 39,713 30,648 213 213 39,500 0.91 453.40 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 53,271 cu-ft SOIL LOSSES 11,503 cu-ft EFFECTIVE RAIN 1.13 in FLOOD VOLUME 0.96 acft FLOOD VOLUME 41,768 cu-ft REQUIRED STORAGE 0.91 REQUIRED STORAGE 39,500 cu-ft MAX WSEL 453.40 ft PEAK FLOW RATE 58.07 cfs TOTAL BASIN LOSSES 2,268 cu-ft AVERAGE PERCOLATION RATE 37.80 cf/min CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 10.19 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.99 Maxwell Drywells UNIT TIME-PERCENT OF LAG 125.3 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.31 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.33 0.31 0.28 0.02 0.24 71 71 25,045 174 71 0 0.00 452.00 2 10 0.17 1.3 0.33 0.31 0.28 0.02 0.24 71 71 25,045 174 71 0 0.00 452.00 3 15 0.25 1.1 0.28 0.31 0.24 0.04 0.44 131 131 25,054 174 131 0 0.00 452.00 4 20 0.33 1.5 0.39 0.31 0.33 0.07 0.76 229 229 25,068 174 174 55 0.00 452.00 5 25 0.42 1.5 0.39 0.31 0.33 0.07 0.76 229 284 25,076 174 174 110 0.00 452.00 6 30 0.50 1.8 0.46 0.31 0.39 0.15 1.55 466 576 25,119 174 174 402 0.01 452.01 7 35 0.58 1.5 0.39 0.31 0.33 0.07 0.76 229 631 25,127 174 174 456 0.01 452.02 8 40 0.67 1.8 0.46 0.31 0.39 0.15 1.55 466 923 25,169 175 175 748 0.02 452.03 9 45 0.75 1.8 0.46 0.31 0.39 0.15 1.55 466 1,214 25,212 175 175 1,039 0.02 452.04 10 50 0.83 1.5 0.39 0.31 0.33 0.07 0.76 229 1,268 25,220 175 175 1,093 0.03 452.04 11 55 0.92 1.6 0.41 0.31 0.35 0.10 1.03 308 1,401 25,239 175 175 1,226 0.03 452.05 12 60 1.00 1.8 0.46 0.31 0.39 0.15 1.55 466 1,692 25,282 176 176 1,517 0.03 452.06 13 65 1.08 2.2 0.56 0.31 0.48 0.25 2.61 783 2,300 25,370 176 176 2,124 0.05 452.08 14 70 1.17 2.2 0.56 0.31 0.48 0.25 2.61 783 2,907 25,458 177 177 2,730 0.06 452.10 15 75 1.25 2.2 0.56 0.31 0.48 0.25 2.61 783 3,513 25,547 177 177 3,336 0.08 452.12 16 80 1.33 2.0 0.51 0.31 0.44 0.20 2.08 625 3,960 25,612 178 178 3,783 0.09 452.14 17 85 1.42 2.6 0.67 0.31 0.57 0.36 3.67 1,100 4,882 25,746 179 179 4,704 0.11 452.17 18 90 1.50 2.7 0.69 0.31 0.59 0.38 3.93 1,179 5,882 25,892 180 180 5,703 0.13 452.21 19 95 1.58 2.4 0.62 0.31 0.52 0.31 3.14 941 6,644 26,003 181 181 6,464 0.15 452.24 20 100 1.67 2.7 0.69 0.31 0.59 0.38 3.93 1,179 7,642 26,148 182 182 7,461 0.17 452.28 21 105 1.75 3.3 0.85 0.31 0.72 0.54 5.51 1,654 9,115 26,363 183 183 8,932 0.21 452.33 22 110 1.83 3.1 0.80 0.31 0.68 0.49 4.99 1,496 10,427 26,554 184 184 10,243 0.24 452.38 23 115 1.92 2.9 0.74 0.31 0.63 0.43 4.46 1,337 11,580 26,722 186 186 11,395 0.26 452.42 24 120 2.00 3.0 0.77 0.31 0.65 0.46 4.72 1,416 12,811 26,901 187 187 12,624 0.29 452.47 25 125 2.08 3.1 0.80 0.31 0.68 0.49 4.99 1,496 14,120 27,092 188 188 13,932 0.32 452.52 Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 10.19 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.99 Maxwell Drywells UNIT TIME-PERCENT OF LAG 125.3 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.31 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 1.08 0.31 0.92 0.77 7.89 2,366 16,298 27,409 190 190 16,108 0.37 452.60 27 135 2.25 5.0 1.28 0.31 1.09 0.97 10.00 3,000 19,108 27,819 193 193 18,914 0.43 452.70 28 140 2.33 3.5 0.90 0.31 0.76 0.59 6.04 1,812 20,727 28,055 195 195 20,532 0.47 452.76 29 145 2.42 6.8 1.75 0.31 1.48 1.44 14.75 4,425 24,957 28,671 199 199 24,758 0.57 452.92 30 150 2.50 7.3 1.87 0.31 1.59 1.56 16.07 4,821 29,578 29,309 204 204 29,375 0.67 453.08 31 155 2.58 8.2 2.11 0.31 1.79 1.79 18.44 5,533 34,908 30,013 208 208 34,699 0.80 453.25 32 160 2.67 5.9 1.52 0.31 1.29 1.20 12.37 3,712 38,411 30,476 212 212 38,200 0.88 453.36 33 165 2.75 2.0 0.51 0.31 0.44 0.20 2.08 625 38,825 30,531 212 212 38,613 0.89 453.38 34 170 2.83 1.8 0.46 0.31 0.39 0.15 1.55 466 39,079 30,564 212 212 38,867 0.89 453.38 35 175 2.92 1.8 0.46 0.31 0.39 0.15 1.55 466 39,333 30,598 212 212 39,121 0.90 453.39 36 180 3.00 0.6 0.15 0.31 0.13 0.02 0.24 71 39,192 30,579 212 212 38,980 0.89 453.39 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 33,734 cu-ft 2.14 in 79,166 cu-ft 453.39 ft 18.44 cfs 6,452 cu-ft 35.84 cf/min 1.23 in 1.04 acft 45,432 cu-ft 0.90 acft 39,121 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 10.19 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.99 Maxwell Drywells UNIT TIME-PERCENT OF LAG 125.3 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.31 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.17 0.31 0.14 0.02 0.26 77 77 25,046 174 77 0 0.00 452.00 2 10 0.17 0.6 0.20 0.31 0.17 0.03 0.31 92 92 25,048 174 92 0 0.00 452.00 3 15 0.25 0.6 0.20 0.31 0.17 0.03 0.31 92 92 25,048 174 92 0 0.00 452.00 4 20 0.33 0.6 0.20 0.31 0.17 0.03 0.31 92 92 25,048 174 92 0 0.00 452.00 5 25 0.42 0.6 0.20 0.31 0.17 0.03 0.31 92 92 25,048 174 92 0 0.00 452.00 6 30 0.50 0.7 0.23 0.31 0.20 0.03 0.36 107 107 25,051 174 107 0 0.00 452.00 7 35 0.58 0.7 0.23 0.31 0.20 0.03 0.36 107 107 25,051 174 107 0 0.00 452.00 8 40 0.67 0.7 0.23 0.31 0.20 0.03 0.36 107 107 25,051 174 107 0 0.00 452.00 9 45 0.75 0.7 0.23 0.31 0.20 0.03 0.36 107 107 25,051 174 107 0 0.00 452.00 10 50 0.83 0.7 0.23 0.31 0.20 0.03 0.36 107 107 25,051 174 107 0 0.00 452.00 11 55 0.92 0.7 0.23 0.31 0.20 0.03 0.36 107 107 25,051 174 107 0 0.00 452.00 12 60 1.00 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 13 65 1.08 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 14 70 1.17 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 15 75 1.25 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 16 80 1.33 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 17 85 1.42 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 18 90 1.50 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 19 95 1.58 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 20 100 1.67 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 21 105 1.75 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 22 110 1.83 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 23 115 1.92 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 24 120 2.00 0.9 0.30 0.31 0.25 0.04 0.46 138 138 25,055 174 138 0 0.00 452.00 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 10.19 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.99 Maxwell Drywells UNIT TIME-PERCENT OF LAG 125.3 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.31 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.26 0.31 0.23 0.04 0.41 123 123 25,053 174 123 0 0.00 452.00 26 130 2.17 0.9 0.30 0.31 0.25 0.04 0.46 138 138 25,055 174 138 0 0.00 452.00 27 135 2.25 0.9 0.30 0.31 0.25 0.04 0.46 138 138 25,055 174 138 0 0.00 452.00 28 140 2.33 0.9 0.30 0.31 0.25 0.04 0.46 138 138 25,055 174 138 0 0.00 452.00 29 145 2.42 0.9 0.30 0.31 0.25 0.04 0.46 138 138 25,055 174 138 0 0.00 452.00 30 150 2.50 0.9 0.30 0.31 0.25 0.04 0.46 138 138 25,055 174 138 0 0.00 452.00 31 155 2.58 0.9 0.30 0.31 0.25 0.04 0.46 138 138 25,055 174 138 0 0.00 452.00 32 160 2.67 0.9 0.30 0.31 0.25 0.04 0.46 138 138 25,055 174 138 0 0.00 452.00 33 165 2.75 1.0 0.33 0.31 0.28 0.02 0.21 62 62 25,044 174 62 0 0.00 452.00 34 170 2.83 1.0 0.33 0.31 0.28 0.02 0.21 62 62 25,044 174 62 0 0.00 452.00 35 175 2.92 1.0 0.33 0.31 0.28 0.02 0.21 62 62 25,044 174 62 0 0.00 452.00 36 180 3.00 1.0 0.33 0.31 0.28 0.02 0.21 62 62 25,044 174 62 0 0.00 452.00 37 185 3.08 1.0 0.33 0.31 0.28 0.02 0.21 62 62 25,044 174 62 0 0.00 452.00 38 190 3.17 1.1 0.36 0.31 0.31 0.05 0.55 165 165 25,059 174 165 0 0.00 452.00 39 195 3.25 1.1 0.36 0.31 0.31 0.05 0.55 165 165 25,059 174 165 0 0.00 452.00 40 200 3.33 1.1 0.36 0.31 0.31 0.05 0.55 165 165 25,059 174 165 0 0.00 452.00 41 205 3.42 1.2 0.40 0.31 0.34 0.09 0.89 267 267 25,074 174 174 93 0.00 452.00 42 210 3.50 1.3 0.43 0.31 0.37 0.12 1.23 369 461 25,102 174 174 287 0.01 452.01 43 215 3.58 1.4 0.46 0.31 0.39 0.15 1.57 471 758 25,145 175 175 583 0.01 452.02 44 220 3.67 1.4 0.46 0.31 0.39 0.15 1.57 471 1,054 25,189 175 175 879 0.02 452.03 45 225 3.75 1.5 0.50 0.31 0.42 0.19 1.91 573 1,452 25,247 175 175 1,277 0.03 452.05 46 230 3.83 1.5 0.50 0.31 0.42 0.19 1.91 573 1,850 25,305 176 176 1,674 0.04 452.06 47 235 3.92 1.6 0.53 0.31 0.45 0.22 2.25 675 2,349 25,377 176 176 2,173 0.05 452.08 48 240 4.00 1.6 0.53 0.31 0.45 0.22 2.25 675 2,848 25,450 177 177 2,671 0.06 452.10 49 245 4.08 1.7 0.56 0.31 0.48 0.25 2.59 777 3,449 25,537 177 177 3,271 0.08 452.12 50 250 4.17 1.8 0.60 0.31 0.51 0.29 2.93 879 4,151 25,640 178 178 3,972 0.09 452.15 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 10.19 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.99 Maxwell Drywells UNIT TIME-PERCENT OF LAG 125.3 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.31 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.63 0.31 0.53 0.32 3.27 981 4,954 25,757 179 179 4,775 0.11 452.18 52 260 4.33 2.0 0.66 0.31 0.56 0.35 3.61 1,083 5,859 25,888 180 180 5,679 0.13 452.21 53 265 4.42 2.1 0.70 0.31 0.59 0.38 3.95 1,186 6,864 26,035 181 181 6,684 0.15 452.25 54 270 4.50 2.1 0.70 0.31 0.59 0.38 3.95 1,186 7,869 26,181 182 182 7,687 0.18 452.28 55 275 4.58 2.2 0.73 0.31 0.62 0.42 4.29 1,288 8,975 26,343 183 183 8,792 0.20 452.33 56 280 4.67 2.3 0.76 0.31 0.65 0.45 4.63 1,390 10,182 26,518 184 184 9,998 0.23 452.37 57 285 4.75 2.4 0.79 0.31 0.68 0.48 4.97 1,492 11,490 26,709 185 185 11,304 0.26 452.42 58 290 4.83 2.4 0.79 0.31 0.68 0.48 4.97 1,492 12,796 26,899 187 187 12,609 0.29 452.47 59 295 4.92 2.5 0.83 0.31 0.70 0.52 5.31 1,594 14,203 27,104 188 188 14,015 0.32 452.52 60 300 5.00 2.6 0.86 0.31 0.73 0.55 5.65 1,696 15,711 27,324 190 190 15,521 0.36 452.58 61 305 5.08 3.1 1.03 0.31 0.87 0.72 7.36 2,207 17,728 27,618 192 192 17,536 0.40 452.65 62 310 5.17 3.6 1.19 0.31 1.01 0.88 9.06 2,717 20,253 27,986 194 194 20,059 0.46 452.74 63 315 5.25 3.9 1.29 0.31 1.10 0.98 10.08 3,023 23,082 28,398 197 197 22,885 0.53 452.85 64 320 5.33 4.2 1.39 0.31 1.18 1.08 11.10 3,330 26,215 28,854 200 200 26,015 0.60 452.96 65 325 5.42 4.7 1.56 0.31 1.32 1.25 12.80 3,840 29,855 29,345 204 204 29,651 0.68 453.09 66 330 5.50 5.6 1.85 0.31 1.58 1.54 15.86 4,759 34,410 29,947 208 208 34,202 0.79 453.23 67 335 5.58 1.9 0.63 0.31 0.53 0.32 3.27 981 35,184 30,050 209 209 34,975 0.80 453.26 68 340 5.67 0.9 0.30 0.31 0.25 0.04 0.46 138 35,113 30,040 209 209 34,904 0.80 453.26 69 345 5.75 0.6 0.20 0.31 0.17 0.03 0.31 92 34,996 30,025 209 209 34,788 0.80 453.25 70 350 5.83 0.5 0.17 0.31 0.14 0.02 0.26 77 34,864 30,007 208 208 34,656 0.80 453.25 71 355 5.92 0.3 0.10 0.31 0.08 0.01 0.15 46 34,702 29,986 208 208 34,494 0.79 453.24 72 360 6.00 0.2 0.07 0.31 0.06 0.01 0.10 31 34,524 29,962 208 208 34,316 0.79 453.24 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 102,102 cu-ft 2.76 in 57,155 cu-ft 453.26 ft 15.86 cfs 29.53 cf/min 10,631 cu-ft 1.21 in 1.03 acft 44,947 cu-ft 0.80 acft 34,975 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 10.19 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.16 LAG TIME - MINUTES 3.99 C 0.00288 Maxwell Drywells UNIT TIME-PERCENT OF LAG 376%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.035 0.549 0.030 0.01 0.05 49 49 25,042 522 49 0 0.00 452.00 2 30 0.50 0.3 0.053 0.543 0.045 0.01 0.08 73 73 25,046 522 73 0 0.00 452.00 3 45 0.75 0.3 0.053 0.536 0.045 0.01 0.08 73 73 25,046 522 73 0 0.00 452.00 4 60 1.00 0.4 0.071 0.530 0.060 0.01 0.11 98 98 25,049 522 98 0 0.00 452.00 5 75 1.25 0.3 0.053 0.524 0.045 0.01 0.08 73 73 25,046 522 73 0 0.00 452.00 6 90 1.50 0.3 0.053 0.518 0.045 0.01 0.08 73 73 25,046 522 73 0 0.00 452.00 7 105 1.75 0.3 0.053 0.511 0.045 0.01 0.08 73 73 25,046 522 73 0 0.00 452.00 8 120 2.00 0.4 0.071 0.505 0.060 0.01 0.11 98 98 25,049 522 98 0 0.00 452.00 9 135 2.25 0.4 0.071 0.499 0.060 0.01 0.11 98 98 25,049 522 98 0 0.00 452.00 10 150 2.50 0.4 0.071 0.493 0.060 0.01 0.11 98 98 25,049 522 98 0 0.00 452.00 11 165 2.75 0.5 0.088 0.487 0.075 0.01 0.14 122 122 25,053 522 122 0 0.00 452.00 12 180 3.00 0.5 0.088 0.481 0.075 0.01 0.14 122 122 25,053 522 122 0 0.00 452.00 13 195 3.25 0.5 0.088 0.475 0.075 0.01 0.14 122 122 25,053 522 122 0 0.00 452.00 14 210 3.50 0.5 0.088 0.469 0.075 0.01 0.14 122 122 25,053 522 122 0 0.00 452.00 15 225 3.75 0.5 0.088 0.463 0.075 0.01 0.14 122 122 25,053 522 122 0 0.00 452.00 16 240 4.00 0.6 0.106 0.457 0.090 0.02 0.16 147 147 25,056 522 147 0 0.00 452.00 17 255 4.25 0.6 0.106 0.452 0.090 0.02 0.16 147 147 25,056 522 147 0 0.00 452.00 18 270 4.50 0.7 0.123 0.446 0.105 0.02 0.19 171 171 25,060 522 171 0 0.00 452.00 19 285 4.75 0.7 0.123 0.440 0.105 0.02 0.19 171 171 25,060 522 171 0 0.00 452.00 20 300 5.00 0.8 0.141 0.435 0.120 0.02 0.22 196 196 25,064 522 196 0 0.00 452.00 21 315 5.25 0.6 0.106 0.429 0.090 0.02 0.16 147 147 25,056 522 147 0 0.00 452.00 22 330 5.50 0.7 0.123 0.423 0.105 0.02 0.19 171 171 25,060 522 171 0 0.00 452.00 23 345 5.75 0.8 0.141 0.418 0.120 0.02 0.22 196 196 25,064 522 196 0 0.00 452.00 24 360 6.00 0.8 0.141 0.412 0.120 0.02 0.22 196 196 25,064 522 196 0 0.00 452.00 25 375 6.25 0.9 0.159 0.407 0.135 0.02 0.24 220 220 25,067 522 220 0 0.00 452.00 26 390 6.50 0.9 0.159 0.401 0.135 0.02 0.24 220 220 25,067 522 220 0 0.00 452.00 27 405 6.75 1.0 0.176 0.396 0.150 0.03 0.27 245 245 25,071 522 245 0 0.00 452.00 28 420 7.00 1.0 0.176 0.391 0.150 0.03 0.27 245 245 25,071 522 245 0 0.00 452.00 29 435 7.25 1.0 0.176 0.385 0.150 0.03 0.27 245 245 25,071 522 245 0 0.00 452.00 30 450 7.50 1.1 0.194 0.380 0.165 0.03 0.30 269 269 25,074 522 269 0 0.00 452.00 31 465 7.75 1.2 0.212 0.375 0.180 0.03 0.33 294 294 25,078 522 294 0 0.00 452.00 32 480 8.00 1.3 0.229 0.370 0.195 0.03 0.35 318 318 25,081 523 318 0 0.00 452.00 33 495 8.25 1.5 0.265 0.365 0.225 0.04 0.41 367 367 25,088 523 367 0 0.00 452.00 34 510 8.50 1.5 0.265 0.359 0.225 0.04 0.41 367 367 25,088 523 367 0 0.00 452.00 35 525 8.75 1.6 0.282 0.354 0.240 0.04 0.44 392 392 25,092 523 392 0 0.00 452.00 36 540 9.00 1.7 0.300 0.349 0.255 0.04 0.46 416 416 25,096 523 416 0 0.00 452.00 37 555 9.25 1.9 0.335 0.345 0.285 0.05 0.52 465 465 25,103 523 465 0 0.00 452.00 38 570 9.50 2.0 0.353 0.340 0.300 0.01 0.14 122 122 25,053 522 122 0 0.00 452.00 39 585 9.75 2.1 0.370 0.335 0.315 0.04 0.37 330 330 25,083 523 330 0 0.00 452.00 40 600 10.00 2.2 0.388 0.330 0.330 0.06 0.60 538 538 25,113 523 523 15 0.00 452.00 41 615 10.25 1.5 0.265 0.325 0.225 0.04 0.41 367 382 25,091 523 382 0 0.00 452.00 42 630 10.50 1.5 0.265 0.320 0.225 0.04 0.41 367 367 25,088 523 367 0 0.00 452.00 43 645 10.75 2.0 0.353 0.316 0.300 0.04 0.38 342 342 25,085 523 342 0 0.00 452.00 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 10.19 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.16 LAG TIME - MINUTES 3.99 C 0.00288 Maxwell Drywells UNIT TIME-PERCENT OF LAG 376%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 44 660 11.00 2.0 0.353 0.311 0.300 0.04 0.43 385 385 25,091 523 385 0 0.00 452.00 45 675 11.25 1.9 0.335 0.307 0.285 0.03 0.29 264 264 25,073 522 264 0 0.00 452.00 46 690 11.50 1.9 0.335 0.302 0.285 0.03 0.34 306 306 25,080 522 306 0 0.00 452.00 47 705 11.75 1.7 0.300 0.298 0.255 0.00 0.02 21 21 25,038 522 21 0 0.00 452.00 48 720 12.00 1.8 0.318 0.293 0.270 0.02 0.25 225 225 25,068 522 225 0 0.00 452.00 49 735 12.25 2.5 0.441 0.289 0.375 0.15 1.56 1,408 1,408 25,240 526 526 882 0.02 452.03 50 750 12.50 2.6 0.459 0.284 0.390 0.17 1.79 1,611 2,493 25,398 529 529 1,963 0.05 452.07 51 765 12.75 2.8 0.494 0.280 0.420 0.21 2.20 1,977 3,940 25,609 534 534 3,407 0.08 452.13 52 780 13.00 2.9 0.512 0.276 0.435 0.24 2.42 2,179 5,585 25,849 539 539 5,047 0.12 452.19 53 795 13.25 3.4 0.600 0.272 0.510 0.33 3.37 3,033 8,080 26,212 546 546 7,534 0.17 452.28 54 810 13.50 3.4 0.600 0.268 0.510 0.33 3.41 3,071 10,605 26,580 554 554 10,051 0.23 452.37 55 825 13.75 2.3 0.406 0.264 0.345 0.14 1.46 1,314 11,365 26,691 556 556 10,809 0.25 452.40 56 840 14.00 2.3 0.406 0.260 0.345 0.15 1.50 1,351 12,161 26,807 558 558 11,602 0.27 452.43 57 855 14.25 2.7 0.476 0.256 0.405 0.22 2.27 2,041 13,643 27,023 563 563 13,080 0.30 452.48 58 870 14.50 2.6 0.459 0.252 0.390 0.21 2.13 1,913 14,993 27,219 567 567 14,426 0.33 452.53 59 885 14.75 2.6 0.459 0.248 0.390 0.21 2.17 1,949 16,375 27,421 571 571 15,804 0.36 452.59 60 900 15.00 2.5 0.441 0.244 0.375 0.20 2.02 1,821 17,625 27,603 575 575 17,050 0.39 452.63 61 915 15.25 2.4 0.423 0.240 0.360 0.18 1.88 1,692 18,742 27,765 578 578 18,164 0.42 452.67 62 930 15.50 2.3 0.406 0.237 0.345 0.17 1.74 1,563 19,727 27,909 581 581 19,146 0.44 452.71 63 945 15.75 1.9 0.335 0.233 0.285 0.10 1.05 944 20,090 27,962 583 583 19,507 0.45 452.72 64 960 16.00 1.9 0.335 0.230 0.285 0.11 1.09 977 20,484 28,019 584 584 19,901 0.46 452.74 65 975 16.25 0.4 0.071 0.226 0.060 0.01 0.11 98 19,999 27,948 582 582 19,416 0.45 452.72 66 990 16.50 0.4 0.071 0.223 0.060 0.01 0.11 98 19,514 27,878 581 581 18,933 0.43 452.70 67 1005 16.75 0.3 0.053 0.219 0.045 0.01 0.08 73 19,007 27,804 579 579 18,428 0.42 452.68 68 1020 17.00 0.3 0.053 0.216 0.045 0.01 0.08 73 18,501 27,730 578 578 17,923 0.41 452.66 69 1035 17.25 0.5 0.088 0.213 0.075 0.01 0.14 122 18,046 27,664 576 576 17,469 0.40 452.65 70 1050 17.50 0.5 0.088 0.209 0.075 0.01 0.14 122 17,592 27,598 575 575 17,017 0.39 452.63 71 1065 17.75 0.5 0.088 0.206 0.075 0.01 0.14 122 17,139 27,532 574 574 16,566 0.38 452.61 72 1080 18.00 0.4 0.071 0.203 0.060 0.01 0.11 98 16,663 27,463 572 572 16,091 0.37 452.60 73 1095 18.25 0.4 0.071 0.200 0.060 0.01 0.11 98 16,189 27,394 571 571 15,618 0.36 452.58 74 1110 18.50 0.4 0.071 0.197 0.060 0.01 0.11 98 15,716 27,325 569 569 15,147 0.35 452.56 75 1125 18.75 0.3 0.053 0.194 0.045 0.01 0.08 73 15,221 27,252 568 568 14,653 0.34 452.54 76 1140 19.00 0.2 0.035 0.192 0.030 0.01 0.05 49 14,702 27,177 566 566 14,136 0.32 452.52 77 1155 19.25 0.3 0.053 0.189 0.045 0.01 0.08 73 14,209 27,105 565 565 13,644 0.31 452.51 78 1170 19.50 0.4 0.071 0.186 0.060 0.01 0.11 98 13,742 27,037 563 563 13,179 0.30 452.49 79 1185 19.75 0.3 0.053 0.184 0.045 0.01 0.08 73 13,252 26,966 562 562 12,690 0.29 452.47 80 1200 20.00 0.2 0.035 0.181 0.030 0.01 0.05 49 12,739 26,891 560 560 12,179 0.28 452.45 81 1215 20.25 0.3 0.053 0.179 0.045 0.01 0.08 73 12,253 26,820 559 559 11,694 0.27 452.43 82 1230 20.50 0.3 0.053 0.177 0.045 0.01 0.08 73 11,767 26,749 557 557 11,210 0.26 452.42 83 1245 20.75 0.3 0.053 0.174 0.045 0.01 0.08 73 11,283 26,679 556 556 10,728 0.25 452.40 84 1260 21.00 0.2 0.035 0.172 0.030 0.01 0.05 49 10,777 26,605 554 554 10,222 0.23 452.38 85 1275 21.25 0.3 0.053 0.170 0.045 0.01 0.08 73 10,296 26,535 553 553 9,743 0.22 452.36 86 1290 21.50 0.2 0.035 0.168 0.030 0.01 0.05 49 9,792 26,462 551 551 9,241 0.21 452.34 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 10.19 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.16 LAG TIME - MINUTES 3.99 C 0.00288 Maxwell Drywells UNIT TIME-PERCENT OF LAG 376%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 87 1305 21.75 0.3 0.053 0.166 0.045 0.01 0.08 73 9,314 26,392 550 550 8,764 0.20 452.32 88 1320 22.00 0.2 0.035 0.165 0.030 0.01 0.05 49 8,813 26,319 548 548 8,265 0.19 452.31 89 1335 22.25 0.3 0.053 0.163 0.045 0.01 0.08 73 8,338 26,250 547 547 7,791 0.18 452.29 90 1350 22.50 0.2 0.035 0.162 0.030 0.01 0.05 49 7,840 26,177 545 545 7,295 0.17 452.27 91 1365 22.75 0.2 0.035 0.160 0.030 0.01 0.05 49 7,344 26,105 544 544 6,800 0.16 452.25 92 1380 23.00 0.2 0.035 0.159 0.030 0.01 0.05 49 6,849 26,033 542 542 6,307 0.14 452.23 93 1395 23.25 0.2 0.035 0.158 0.030 0.01 0.05 49 6,356 25,961 541 541 5,815 0.13 452.22 94 1410 23.50 0.2 0.035 0.157 0.030 0.01 0.05 49 5,864 25,889 539 539 5,324 0.12 452.20 95 1425 23.75 0.2 0.035 0.156 0.030 0.01 0.05 49 5,373 25,818 538 538 4,835 0.11 452.18 96 1440 24.00 0.2 0.035 0.156 0.030 0.01 0.05 49 4,884 25,747 536 536 4,348 0.10 452.16 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 4.41 in 163,141 cu-ft 121,656 cu-ft 452.74 ft 3.41 cfs 37,137 cu-ft 25.79 cf/min 1.12 in 0.95 acft 41,485 cu-ft 0.46 acft 19,901 cu-ft Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL BASIN C BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 2.588 D 56 0.51 1.00 3 B WATER FEATURE 2.323 D 56 0.51 1.00 1 B COMMERCIAL 4.803 D 56 0.51 0.90 6 B SF - HIGH DENSITY 7.637 D 56 0.51 0.50 9 B LANDSCAPING 11.052 D 56 0.51 0.10 780 ft 390 ft 459.5 ft ELEVATION OF CONCENTRATION POINT 453.0 ft 0.02 100 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in BASIN CHARACTERISTICS:ELEVATION AREA 451.0 ft 101,190 sf 452.0 ft 112,495 sf 452.5 ft 135,570 sf PERCOLATION RATE (in/hr)0.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention DA-D RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 BASIN D AMC NUMBER Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)148,469 220,641 284,565 454,686 SOIL LOSSES (cu-ft)28,994 85,691 152,510 322,600 EFFECTIVE RAIN (in)1.16 1.31 1.28 1.28 FLOOD VOLUME (cu-ft)119,475 134,950 132,055 132,086 acre-ft)2.74 3.10 3.03 3.03 REQUIRED STORAGE (cu-ft)119,475 134,950 132,055 132,086 acre-ft)2.74 3.10 3.03 3.03 FACTOR OF SAFETY 1.41 1.25 1.28 1.28 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 52.25 45.06 10.24 MAXIMUM WSEL (ft)452.10 452.23 452.20 452.20 DEPTH (ft)1.10 1.23 1.20 1.20 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) 18] 200% OF LAG-MINUTES RAINFALL DATA 5.0 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. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 168,719 3.87 0.02 17] 100% OF LAG-MINUTES 2.5 2.5 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.04 16] LAG TIME-MINUTES 13] L*LCA/S^0.5 6.63 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.002 390.00 12] S^0.5 0.074 44.0 459.5 453 6.5 3] AREA - ACRES 4] L-FEET 5] L-MILES 780 0.148 BASIN D DA-D CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 28.403 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 2.588 0.091 0.0046 DEVELOPED 0.1000 0.0091 B 56 0.51 100%0.05 2.323 0.082 0.0042 DEVELOPED 0.1000 0.0082 B 56 0.51 90%0.10 4.803 0.169 0.0164 DEVELOPED 0.1800 0.0304 B 56 0.51 50%0.28 7.637 0.269 0.0754 DEVELOPED 0.5000 0.1344 B 56 0.51 10%0.46 11.052 0.389 0.1806 DEVELOPED 0.8200 0.3191 SUM 28.403 SUM 0.2812 0.5012 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.140606334 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00260 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00260 0.14 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.2812 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. LANDSCAPING 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE WATER FEATURE COMMERCIAL SF - HIGH DENSITY AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 28.40 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.52 Maxwell Drywells UNIT TIME-PERCENT OF LAG 198.4 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.44 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.28 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.62 0.28 0.53 0.34 9.76 2,929 2,929 101,500 0 0 2,929 0.07 451.03 2 10 0.17 4.2 0.73 0.28 0.62 0.44 12.73 3,820 6,748 101,904 0 0 6,748 0.15 451.06 3 15 0.25 4.4 0.76 0.28 0.65 0.48 13.72 4,116 10,865 102,340 0 0 10,865 0.25 451.10 4 20 0.33 4.6 0.79 0.28 0.68 0.51 14.71 4,413 15,278 102,807 0 0 15,278 0.35 451.14 5 25 0.42 5.0 0.86 0.28 0.73 0.58 16.69 5,007 20,285 103,337 0 0 20,285 0.47 451.19 6 30 0.50 5.6 0.97 0.28 0.82 0.69 19.66 5,898 26,183 103,962 0 0 26,183 0.60 451.25 7 35 0.58 6.4 1.11 0.28 0.94 0.82 23.62 7,086 33,269 104,712 0 0 33,269 0.76 451.31 8 40 0.67 8.1 1.40 0.28 1.19 1.12 32.03 9,610 42,879 105,729 0 0 42,879 0.98 451.40 9 45 0.75 13.1 2.26 0.28 1.92 1.98 56.78 17,033 59,912 107,532 0 0 59,912 1.38 451.56 10 50 0.83 34.5 5.96 0.28 5.07 5.68 162.69 48,806 108,718 113,212 0 0 108,718 2.50 452.02 11 55 0.92 6.7 1.16 0.28 0.98 0.88 25.10 7,531 116,249 116,019 0 0 116,249 2.67 452.08 12 60 1.00 3.8 0.66 0.28 0.56 0.38 10.75 3,226 119,475 117,221 0 0 119,475 2.74 452.10 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 148,469 cu-ft SOIL LOSSES 28,994 cu-ft EFFECTIVE RAIN 1.16 in FLOOD VOLUME 2.74 acft FLOOD VOLUME 119,475 cu-ft REQUIRED STORAGE 2.74 REQUIRED STORAGE 119,475 cu-ft MAX WSEL 452.10 ft PEAK FLOW RATE 162.69 cfs TOTAL BASIN LOSSES 0 cu-ft AVERAGE PERCOLATION RATE 0.00 cf/min EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 28.40 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.52 Maxwell Drywells UNIT TIME-PERCENT OF LAG 198.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.28 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.33 0.28 0.28 0.05 1.51 452 452 101,238 0 0 452 0.01 451.00 2 10 0.17 1.3 0.33 0.28 0.28 0.05 1.51 452 904 101,286 0 0 904 0.02 451.01 3 15 0.25 1.1 0.28 0.28 0.24 0.00 0.04 11 915 101,287 0 0 915 0.02 451.01 4 20 0.33 1.5 0.39 0.28 0.33 0.10 2.98 893 1,809 101,381 0 0 1,809 0.04 451.02 5 25 0.42 1.5 0.39 0.28 0.33 0.10 2.98 893 2,702 101,476 0 0 2,702 0.06 451.03 6 30 0.50 1.8 0.46 0.28 0.39 0.18 5.18 1,555 4,258 101,641 0 0 4,258 0.10 451.04 7 35 0.58 1.5 0.39 0.28 0.33 0.10 2.98 893 5,151 101,735 0 0 5,151 0.12 451.05 8 40 0.67 1.8 0.46 0.28 0.39 0.18 5.18 1,555 6,706 101,900 0 0 6,706 0.15 451.06 9 45 0.75 1.8 0.46 0.28 0.39 0.18 5.18 1,555 8,262 102,065 0 0 8,262 0.19 451.08 10 50 0.83 1.5 0.39 0.28 0.33 0.10 2.98 893 9,155 102,159 0 0 9,155 0.21 451.09 11 55 0.92 1.6 0.41 0.28 0.35 0.13 3.71 1,114 10,269 102,277 0 0 10,269 0.24 451.10 12 60 1.00 1.8 0.46 0.28 0.39 0.18 5.18 1,555 11,825 102,442 0 0 11,825 0.27 451.11 13 65 1.08 2.2 0.56 0.28 0.48 0.28 8.13 2,438 14,263 102,700 0 0 14,263 0.33 451.13 14 70 1.17 2.2 0.56 0.28 0.48 0.28 8.13 2,438 16,701 102,958 0 0 16,701 0.38 451.16 15 75 1.25 2.2 0.56 0.28 0.48 0.28 8.13 2,438 19,138 103,216 0 0 19,138 0.44 451.18 16 80 1.33 2.0 0.51 0.28 0.44 0.23 6.66 1,997 21,135 103,427 0 0 21,135 0.49 451.20 17 85 1.42 2.6 0.67 0.28 0.57 0.39 11.07 3,321 24,456 103,779 0 0 24,456 0.56 451.23 18 90 1.50 2.7 0.69 0.28 0.59 0.41 11.80 3,541 27,997 104,154 0 0 27,997 0.64 451.26 19 95 1.58 2.4 0.62 0.28 0.52 0.34 9.60 2,879 30,876 104,459 0 0 30,876 0.71 451.29 20 100 1.67 2.7 0.69 0.28 0.59 0.41 11.80 3,541 34,417 104,833 0 0 34,417 0.79 451.32 21 105 1.75 3.3 0.85 0.28 0.72 0.57 16.22 4,865 39,282 105,348 0 0 39,282 0.90 451.37 22 110 1.83 3.1 0.80 0.28 0.68 0.51 14.75 4,424 43,706 105,817 0 0 43,706 1.00 451.41 23 115 1.92 2.9 0.74 0.28 0.63 0.46 13.27 3,982 47,688 106,238 0 0 47,688 1.09 451.45 24 120 2.00 3.0 0.77 0.28 0.65 0.49 14.01 4,203 51,891 106,683 0 0 51,891 1.19 451.49 25 125 2.08 3.1 0.80 0.28 0.68 0.51 14.75 4,424 56,315 107,151 0 0 56,315 1.29 451.53 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 28.40 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.52 Maxwell Drywells UNIT TIME-PERCENT OF LAG 198.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.28 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses 26 130 2.17 4.2 1.08 0.28 0.92 0.80 22.84 6,851 63,166 107,877 0 0 63,166 1.45 451.59 27 135 2.25 5.0 1.28 0.28 1.09 1.00 28.72 8,616 71,782 108,789 0 0 71,782 1.65 451.67 28 140 2.33 3.5 0.90 0.28 0.76 0.62 17.69 5,306 77,088 109,350 0 0 77,088 1.77 451.72 29 145 2.42 6.8 1.75 0.28 1.48 1.47 41.96 12,587 89,675 110,683 0 0 89,675 2.06 451.84 30 150 2.50 7.3 1.87 0.28 1.59 1.59 45.64 13,691 103,366 112,132 0 0 103,366 2.37 451.97 31 155 2.58 8.2 2.11 0.28 1.79 1.82 52.25 15,676 119,042 117,060 0 0 119,042 2.73 452.10 32 160 2.67 5.9 1.52 0.28 1.29 1.23 35.34 10,602 129,644 121,010 0 0 129,644 2.98 452.18 33 165 2.75 2.0 0.51 0.28 0.44 0.23 6.66 1,997 131,641 121,754 0 0 131,641 3.02 452.20 34 170 2.83 1.8 0.46 0.28 0.39 0.18 5.18 1,555 133,196 122,333 0 0 133,196 3.06 452.21 35 175 2.92 1.8 0.46 0.28 0.39 0.18 5.18 1,555 134,752 122,913 0 0 134,752 3.09 452.23 36 180 3.00 0.6 0.15 0.28 0.13 0.02 0.66 199 134,950 122,987 0 0 134,950 3.10 452.23 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 0 cu-ft 0.00 cf/min 1.31 in 3.10 acft 134,950 cu-ft 3.10 acft 134,950 cu-ft 85,691 cu-ft 2.14 in 220,641 cu-ft 452.23 ft 52.25 cfs Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 28.40 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.52 Maxwell Drywells UNIT TIME-PERCENT OF LAG 198.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.28 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.17 0.28 0.14 0.02 0.71 213 213 101,213 0 0 213 0.00 451.00 2 10 0.17 0.6 0.20 0.28 0.17 0.03 0.85 256 470 101,240 0 0 470 0.01 451.00 3 15 0.25 0.6 0.20 0.28 0.17 0.03 0.85 256 726 101,267 0 0 726 0.02 451.01 4 20 0.33 0.6 0.20 0.28 0.17 0.03 0.85 256 982 101,294 0 0 982 0.02 451.01 5 25 0.42 0.6 0.20 0.28 0.17 0.03 0.85 256 1,238 101,321 0 0 1,238 0.03 451.01 6 30 0.50 0.7 0.23 0.28 0.20 0.03 1.00 299 1,537 101,353 0 0 1,537 0.04 451.01 7 35 0.58 0.7 0.23 0.28 0.20 0.03 1.00 299 1,835 101,384 0 0 1,835 0.04 451.02 8 40 0.67 0.7 0.23 0.28 0.20 0.03 1.00 299 2,134 101,416 0 0 2,134 0.05 451.02 9 45 0.75 0.7 0.23 0.28 0.20 0.03 1.00 299 2,433 101,448 0 0 2,433 0.06 451.02 10 50 0.83 0.7 0.23 0.28 0.20 0.03 1.00 299 2,732 101,479 0 0 2,732 0.06 451.03 11 55 0.92 0.7 0.23 0.28 0.20 0.03 1.00 299 3,031 101,511 0 0 3,031 0.07 451.03 12 60 1.00 0.8 0.26 0.28 0.23 0.04 1.14 341 3,372 101,547 0 0 3,372 0.08 451.03 13 65 1.08 0.8 0.26 0.28 0.23 0.04 1.14 341 3,714 101,583 0 0 3,714 0.09 451.03 14 70 1.17 0.8 0.26 0.28 0.23 0.04 1.14 341 4,055 101,619 0 0 4,055 0.09 451.04 15 75 1.25 0.8 0.26 0.28 0.23 0.04 1.14 341 4,397 101,655 0 0 4,397 0.10 451.04 16 80 1.33 0.8 0.26 0.28 0.23 0.04 1.14 341 4,738 101,692 0 0 4,738 0.11 451.04 17 85 1.42 0.8 0.26 0.28 0.23 0.04 1.14 341 5,079 101,728 0 0 5,079 0.12 451.05 18 90 1.50 0.8 0.26 0.28 0.23 0.04 1.14 341 5,421 101,764 0 0 5,421 0.12 451.05 19 95 1.58 0.8 0.26 0.28 0.23 0.04 1.14 341 5,762 101,800 0 0 5,762 0.13 451.05 20 100 1.67 0.8 0.26 0.28 0.23 0.04 1.14 341 6,104 101,836 0 0 6,104 0.14 451.06 21 105 1.75 0.8 0.26 0.28 0.23 0.04 1.14 341 6,445 101,872 0 0 6,445 0.15 451.06 22 110 1.83 0.8 0.26 0.28 0.23 0.04 1.14 341 6,787 101,908 0 0 6,787 0.16 451.06 23 115 1.92 0.8 0.26 0.28 0.23 0.04 1.14 341 7,128 101,945 0 0 7,128 0.16 451.07 24 120 2.00 0.9 0.30 0.28 0.25 0.02 0.48 145 7,273 101,960 0 0 7,273 0.17 451.07 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 28.40 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.52 Maxwell Drywells UNIT TIME-PERCENT OF LAG 198.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.28 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.26 0.28 0.23 0.04 1.14 341 7,615 101,996 0 0 7,615 0.17 451.07 26 130 2.17 0.9 0.30 0.28 0.25 0.02 0.48 145 7,760 102,011 0 0 7,760 0.18 451.07 27 135 2.25 0.9 0.30 0.28 0.25 0.02 0.48 145 7,905 102,027 0 0 7,905 0.18 451.07 28 140 2.33 0.9 0.30 0.28 0.25 0.02 0.48 145 8,050 102,042 0 0 8,050 0.18 451.08 29 145 2.42 0.9 0.30 0.28 0.25 0.02 0.48 145 8,194 102,057 0 0 8,194 0.19 451.08 30 150 2.50 0.9 0.30 0.28 0.25 0.02 0.48 145 8,339 102,073 0 0 8,339 0.19 451.08 31 155 2.58 0.9 0.30 0.28 0.25 0.02 0.48 145 8,484 102,088 0 0 8,484 0.19 451.08 32 160 2.67 0.9 0.30 0.28 0.25 0.02 0.48 145 8,629 102,103 0 0 8,629 0.20 451.08 33 165 2.75 1.0 0.33 0.28 0.28 0.05 1.43 429 9,059 102,149 0 0 9,059 0.21 451.08 34 170 2.83 1.0 0.33 0.28 0.28 0.05 1.43 429 9,488 102,194 0 0 9,488 0.22 451.09 35 175 2.92 1.0 0.33 0.28 0.28 0.05 1.43 429 9,918 102,240 0 0 9,918 0.23 451.09 36 180 3.00 1.0 0.33 0.28 0.28 0.05 1.43 429 10,347 102,285 0 0 10,347 0.24 451.10 37 185 3.08 1.0 0.33 0.28 0.28 0.05 1.43 429 10,777 102,331 0 0 10,777 0.25 451.10 38 190 3.17 1.1 0.36 0.28 0.31 0.08 2.38 714 11,491 102,406 0 0 11,491 0.26 451.11 39 195 3.25 1.1 0.36 0.28 0.31 0.08 2.38 714 12,205 102,482 0 0 12,205 0.28 451.11 40 200 3.33 1.1 0.36 0.28 0.31 0.08 2.38 714 12,919 102,558 0 0 12,919 0.30 451.12 41 205 3.42 1.2 0.40 0.28 0.34 0.12 3.33 999 13,917 102,663 0 0 13,917 0.32 451.13 42 210 3.50 1.3 0.43 0.28 0.37 0.15 4.28 1,283 15,201 102,799 0 0 15,201 0.35 451.14 43 215 3.58 1.4 0.46 0.28 0.39 0.18 5.23 1,568 16,768 102,965 0 0 16,768 0.38 451.16 44 220 3.67 1.4 0.46 0.28 0.39 0.18 5.23 1,568 18,336 103,131 0 0 18,336 0.42 451.17 45 225 3.75 1.5 0.50 0.28 0.42 0.22 6.17 1,852 20,188 103,327 0 0 20,188 0.46 451.19 46 230 3.83 1.5 0.50 0.28 0.42 0.22 6.17 1,852 22,041 103,523 0 0 22,041 0.51 451.21 47 235 3.92 1.6 0.53 0.28 0.45 0.25 7.12 2,137 24,178 103,749 0 0 24,178 0.56 451.23 48 240 4.00 1.6 0.53 0.28 0.45 0.25 7.12 2,137 26,315 103,976 0 0 26,315 0.60 451.25 49 245 4.08 1.7 0.56 0.28 0.48 0.28 8.07 2,421 28,736 104,232 0 0 28,736 0.66 451.27 50 250 4.17 1.8 0.60 0.28 0.51 0.31 9.02 2,706 31,442 104,518 0 0 31,442 0.72 451.29 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 28.40 Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 2.52 Maxwell Drywells UNIT TIME-PERCENT OF LAG 198.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.28 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.63 0.28 0.53 0.35 9.97 2,991 34,433 104,835 0 0 34,433 0.79 451.32 52 260 4.33 2.0 0.66 0.28 0.56 0.38 10.92 3,275 37,708 105,182 0 0 37,708 0.87 451.35 53 265 4.42 2.1 0.70 0.28 0.59 0.41 11.87 3,560 41,267 105,559 0 0 41,267 0.95 451.39 54 270 4.50 2.1 0.70 0.28 0.59 0.41 11.87 3,560 44,827 105,935 0 0 44,827 1.03 451.42 55 275 4.58 2.2 0.73 0.28 0.62 0.45 12.81 3,844 48,671 106,342 0 0 48,671 1.12 451.46 56 280 4.67 2.3 0.76 0.28 0.65 0.48 13.76 4,129 52,800 106,779 0 0 52,800 1.21 451.49 57 285 4.75 2.4 0.79 0.28 0.68 0.51 14.71 4,413 57,214 107,247 0 0 57,214 1.31 451.54 58 290 4.83 2.4 0.79 0.28 0.68 0.51 14.71 4,413 61,627 107,714 0 0 61,627 1.41 451.58 59 295 4.92 2.5 0.83 0.28 0.70 0.55 15.66 4,698 66,325 108,211 0 0 66,325 1.52 451.62 60 300 5.00 2.6 0.86 0.28 0.73 0.58 16.61 4,983 71,307 108,739 0 0 71,307 1.64 451.67 61 305 5.08 3.1 1.03 0.28 0.87 0.75 21.35 6,405 77,713 109,417 0 0 77,713 1.78 451.73 62 310 5.17 3.6 1.19 0.28 1.01 0.91 26.09 7,828 85,541 110,245 0 0 85,541 1.96 451.80 63 315 5.25 3.9 1.29 0.28 1.10 1.01 28.94 8,682 94,223 111,164 0 0 94,223 2.16 451.88 64 320 5.33 4.2 1.39 0.28 1.18 1.11 31.79 9,536 103,758 112,174 0 0 103,758 2.38 451.97 65 325 5.42 4.7 1.56 0.28 1.32 1.28 36.53 10,958 114,717 115,448 0 0 114,717 2.63 452.06 66 330 5.50 5.6 1.85 0.28 1.58 1.57 45.06 13,519 128,236 120,485 0 0 128,236 2.94 452.17 67 335 5.58 1.9 0.63 0.28 0.53 0.35 9.97 2,991 131,227 121,600 0 0 131,227 3.01 452.20 68 340 5.67 0.9 0.30 0.28 0.25 0.02 0.48 145 131,372 121,654 0 0 131,372 3.02 452.20 69 345 5.75 0.6 0.20 0.28 0.17 0.03 0.85 256 131,628 121,749 0 0 131,628 3.02 452.20 70 350 5.83 0.5 0.17 0.28 0.14 0.02 0.71 213 131,841 121,829 0 0 131,841 3.03 452.20 71 355 5.92 0.3 0.10 0.28 0.08 0.01 0.43 128 131,969 121,876 0 0 131,969 3.03 452.20 72 360 6.00 0.2 0.07 0.28 0.06 0.01 0.28 85 132,055 121,908 0 0 132,055 3.03 452.20 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 0.00 cf/min 0 cu-ft 1.28 in 3.03 acft 132,055 cu-ft 3.03 acft 132,055 cu-ft 284,565 cu-ft 2.76 in 152,510 cu-ft 452.20 ft 45.06 cfs Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 28.40 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.14 LAG TIME - MINUTES 2.52 C 0.00260 Maxwell Drywells UNIT TIME-PERCENT OF LAG 595%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.035 0.497 0.030 0.01 0.15 136 136 101,204 0 0 136 0.00 451.00 2 30 0.50 0.3 0.053 0.491 0.045 0.01 0.23 205 341 101,226 0 0 341 0.01 451.00 3 45 0.75 0.3 0.053 0.485 0.045 0.01 0.23 205 546 101,248 0 0 546 0.01 451.01 4 60 1.00 0.4 0.071 0.479 0.060 0.01 0.30 273 818 101,277 0 0 818 0.02 451.01 5 75 1.25 0.3 0.053 0.474 0.045 0.01 0.23 205 1,023 101,298 0 0 1,023 0.02 451.01 6 90 1.50 0.3 0.053 0.468 0.045 0.01 0.23 205 1,228 101,320 0 0 1,228 0.03 451.01 7 105 1.75 0.3 0.053 0.463 0.045 0.01 0.23 205 1,432 101,342 0 0 1,432 0.03 451.01 8 120 2.00 0.4 0.071 0.457 0.060 0.01 0.30 273 1,705 101,370 0 0 1,705 0.04 451.02 9 135 2.25 0.4 0.071 0.451 0.060 0.01 0.30 273 1,978 101,399 0 0 1,978 0.05 451.02 10 150 2.50 0.4 0.071 0.446 0.060 0.01 0.30 273 2,251 101,428 0 0 2,251 0.05 451.02 11 165 2.75 0.5 0.088 0.440 0.075 0.01 0.38 341 2,592 101,464 0 0 2,592 0.06 451.02 12 180 3.00 0.5 0.088 0.435 0.075 0.01 0.38 341 2,933 101,500 0 0 2,933 0.07 451.03 13 195 3.25 0.5 0.088 0.430 0.075 0.01 0.38 341 3,274 101,537 0 0 3,274 0.08 451.03 14 210 3.50 0.5 0.088 0.424 0.075 0.01 0.38 341 3,615 101,573 0 0 3,615 0.08 451.03 15 225 3.75 0.5 0.088 0.419 0.075 0.01 0.38 341 3,956 101,609 0 0 3,956 0.09 451.04 16 240 4.00 0.6 0.106 0.414 0.090 0.02 0.45 409 4,365 101,652 0 0 4,365 0.10 451.04 17 255 4.25 0.6 0.106 0.409 0.090 0.02 0.45 409 4,774 101,695 0 0 4,774 0.11 451.04 18 270 4.50 0.7 0.123 0.403 0.105 0.02 0.53 477 5,252 101,746 0 0 5,252 0.12 451.05 19 285 4.75 0.7 0.123 0.398 0.105 0.02 0.53 477 5,729 101,796 0 0 5,729 0.13 451.05 20 300 5.00 0.8 0.141 0.393 0.120 0.02 0.61 546 6,275 101,854 0 0 6,275 0.14 451.06 21 315 5.25 0.6 0.106 0.388 0.090 0.02 0.45 409 6,684 101,898 0 0 6,684 0.15 451.06 22 330 5.50 0.7 0.123 0.383 0.105 0.02 0.53 477 7,161 101,948 0 0 7,161 0.16 451.07 23 345 5.75 0.8 0.141 0.378 0.120 0.02 0.61 546 7,707 102,006 0 0 7,707 0.18 451.07 24 360 6.00 0.8 0.141 0.373 0.120 0.02 0.61 546 8,253 102,064 0 0 8,253 0.19 451.08 25 375 6.25 0.9 0.159 0.368 0.135 0.02 0.68 614 8,866 102,129 0 0 8,866 0.20 451.08 26 390 6.50 0.9 0.159 0.363 0.135 0.02 0.68 614 9,480 102,194 0 0 9,480 0.22 451.09 27 405 6.75 1.0 0.176 0.358 0.150 0.03 0.76 682 10,162 102,266 0 0 10,162 0.23 451.10 28 420 7.00 1.0 0.176 0.353 0.150 0.03 0.76 682 10,844 102,338 0 0 10,844 0.25 451.10 29 435 7.25 1.0 0.176 0.348 0.150 0.03 0.76 682 11,526 102,410 0 0 11,526 0.26 451.11 30 450 7.50 1.1 0.194 0.344 0.165 0.03 0.83 750 12,277 102,490 0 0 12,277 0.28 451.11 31 465 7.75 1.2 0.212 0.339 0.180 0.03 0.91 818 13,095 102,576 0 0 13,095 0.30 451.12 32 480 8.00 1.3 0.229 0.334 0.195 0.03 0.99 887 13,982 102,670 0 0 13,982 0.32 451.13 33 495 8.25 1.5 0.265 0.330 0.225 0.04 1.14 1,023 15,005 102,778 0 0 15,005 0.34 451.14 34 510 8.50 1.5 0.265 0.325 0.225 0.04 1.14 1,023 16,028 102,887 0 0 16,028 0.37 451.15 35 525 8.75 1.6 0.282 0.321 0.240 0.04 1.21 1,091 17,119 103,002 0 0 17,119 0.39 451.16 36 540 9.00 1.7 0.300 0.316 0.255 0.04 1.29 1,159 18,278 103,125 0 0 18,278 0.42 451.17 37 555 9.25 1.9 0.335 0.312 0.285 0.02 0.68 608 18,886 103,189 0 0 18,886 0.43 451.18 38 570 9.50 2.0 0.353 0.307 0.300 0.05 1.31 1,177 20,063 103,314 0 0 20,063 0.46 451.19 39 585 9.75 2.1 0.370 0.303 0.315 0.07 1.94 1,745 21,808 103,499 0 0 21,808 0.50 451.20 40 600 10.00 2.2 0.388 0.298 0.330 0.09 2.57 2,312 24,119 103,743 0 0 24,119 0.55 451.23 41 615 10.25 1.5 0.265 0.294 0.225 0.04 1.14 1,023 25,142 103,852 0 0 25,142 0.58 451.24 42 630 10.50 1.5 0.265 0.290 0.225 0.04 1.14 1,023 26,165 103,960 0 0 26,165 0.60 451.25 43 645 10.75 2.0 0.353 0.286 0.300 0.07 1.92 1,732 27,897 104,143 0 0 27,897 0.64 451.26 in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 28.40 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.14 LAG TIME - MINUTES 2.52 C 0.00260 Maxwell Drywells UNIT TIME-PERCENT OF LAG 595%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 44 660 11.00 2.0 0.353 0.281 0.300 0.07 2.04 1,840 29,737 104,338 0 0 29,737 0.68 451.28 45 675 11.25 1.9 0.335 0.277 0.285 0.06 1.66 1,492 31,229 104,496 0 0 31,229 0.72 451.29 46 690 11.50 1.9 0.335 0.273 0.285 0.06 1.77 1,597 32,826 104,665 0 0 32,826 0.75 451.31 47 705 11.75 1.7 0.300 0.269 0.255 0.03 0.88 792 33,618 104,749 0 0 33,618 0.77 451.31 48 720 12.00 1.8 0.318 0.265 0.270 0.05 1.50 1,350 34,968 104,892 0 0 34,968 0.80 451.33 49 735 12.25 2.5 0.441 0.261 0.375 0.18 5.15 4,635 39,603 105,382 0 0 39,603 0.91 451.37 50 750 12.50 2.6 0.459 0.257 0.390 0.20 5.77 5,190 44,793 105,932 0 0 44,793 1.03 451.42 51 765 12.75 2.8 0.494 0.253 0.420 0.24 6.89 6,199 50,992 106,588 0 0 50,992 1.17 451.48 52 780 13.00 2.9 0.512 0.250 0.435 0.26 7.50 6,752 57,744 107,303 0 0 57,744 1.33 451.54 53 795 13.25 3.4 0.600 0.246 0.510 0.35 10.14 9,123 66,868 108,269 0 0 66,868 1.54 451.63 54 810 13.50 3.4 0.600 0.242 0.510 0.36 10.24 9,219 76,087 109,244 0 0 76,087 1.75 451.71 55 825 13.75 2.3 0.406 0.238 0.345 0.17 4.79 4,312 80,399 109,701 0 0 80,399 1.85 451.75 56 840 14.00 2.3 0.406 0.235 0.345 0.17 4.90 4,406 84,805 110,167 0 0 84,805 1.95 451.79 57 855 14.25 2.7 0.476 0.231 0.405 0.25 7.02 6,317 91,122 110,836 0 0 91,122 2.09 451.85 58 870 14.50 2.6 0.459 0.228 0.390 0.23 6.61 5,953 97,075 111,466 0 0 97,075 2.23 451.91 59 885 14.75 2.6 0.459 0.224 0.390 0.23 6.71 6,043 103,118 112,106 0 0 103,118 2.37 451.97 60 900 15.00 2.5 0.441 0.221 0.375 0.22 6.31 5,677 108,794 113,241 0 0 108,794 2.50 452.02 61 915 15.25 2.4 0.423 0.217 0.360 0.21 5.90 5,309 114,103 115,219 0 0 114,103 2.62 452.06 62 930 15.50 2.3 0.406 0.214 0.345 0.19 5.49 4,940 119,044 117,060 0 0 119,044 2.73 452.10 63 945 15.75 1.9 0.335 0.211 0.285 0.12 3.56 3,206 122,249 118,254 0 0 122,249 2.81 452.12 64 960 16.00 1.9 0.335 0.208 0.285 0.13 3.65 3,289 125,538 119,480 0 0 125,538 2.88 452.15 65 975 16.25 0.4 0.071 0.204 0.060 0.01 0.30 273 125,811 119,582 0 0 125,811 2.89 452.15 66 990 16.50 0.4 0.071 0.201 0.060 0.01 0.30 273 126,084 119,683 0 0 126,084 2.89 452.16 67 1005 16.75 0.3 0.053 0.198 0.045 0.01 0.23 205 126,288 119,759 0 0 126,288 2.90 452.16 68 1020 17.00 0.3 0.053 0.195 0.045 0.01 0.23 205 126,493 119,836 0 0 126,493 2.90 452.16 69 1035 17.25 0.5 0.088 0.192 0.075 0.01 0.38 341 126,834 119,963 0 0 126,834 2.91 452.16 70 1050 17.50 0.5 0.088 0.189 0.075 0.01 0.38 341 127,175 120,090 0 0 127,175 2.92 452.16 71 1065 17.75 0.5 0.088 0.187 0.075 0.01 0.38 341 127,516 120,217 0 0 127,516 2.93 452.17 72 1080 18.00 0.4 0.071 0.184 0.060 0.01 0.30 273 127,789 120,319 0 0 127,789 2.93 452.17 73 1095 18.25 0.4 0.071 0.181 0.060 0.01 0.30 273 128,062 120,420 0 0 128,062 2.94 452.17 74 1110 18.50 0.4 0.071 0.178 0.060 0.01 0.30 273 128,334 120,522 0 0 128,334 2.95 452.17 75 1125 18.75 0.3 0.053 0.176 0.045 0.01 0.23 205 128,539 120,598 0 0 128,539 2.95 452.18 76 1140 19.00 0.2 0.035 0.173 0.030 0.01 0.15 136 128,675 120,649 0 0 128,675 2.95 452.18 77 1155 19.25 0.3 0.053 0.171 0.045 0.01 0.23 205 128,880 120,725 0 0 128,880 2.96 452.18 78 1170 19.50 0.4 0.071 0.169 0.060 0.01 0.30 273 129,153 120,827 0 0 129,153 2.96 452.18 79 1185 19.75 0.3 0.053 0.166 0.045 0.01 0.23 205 129,357 120,903 0 0 129,357 2.97 452.18 80 1200 20.00 0.2 0.035 0.164 0.030 0.01 0.15 136 129,494 120,954 0 0 129,494 2.97 452.18 81 1215 20.25 0.3 0.053 0.162 0.045 0.01 0.23 205 129,698 121,030 0 0 129,698 2.98 452.18 82 1230 20.50 0.3 0.053 0.160 0.045 0.01 0.23 205 129,903 121,106 0 0 129,903 2.98 452.19 83 1245 20.75 0.3 0.053 0.158 0.045 0.01 0.23 205 130,108 121,183 0 0 130,108 2.99 452.19 84 1260 21.00 0.2 0.035 0.156 0.030 0.01 0.15 136 130,244 121,233 0 0 130,244 2.99 452.19 85 1275 21.25 0.3 0.053 0.154 0.045 0.01 0.23 205 130,449 121,310 0 0 130,449 2.99 452.19 86 1290 21.50 0.2 0.035 0.152 0.030 0.01 0.15 136 130,585 121,361 0 0 130,585 3.00 452.19 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 28.40 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 0.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.14 LAG TIME - MINUTES 2.52 C 0.00260 Maxwell Drywells UNIT TIME-PERCENT OF LAG 595%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 87 1305 21.75 0.3 0.053 0.151 0.045 0.01 0.23 205 130,790 121,437 0 0 130,790 3.00 452.19 88 1320 22.00 0.2 0.035 0.149 0.030 0.01 0.15 136 130,926 121,488 0 0 130,926 3.01 452.19 89 1335 22.25 0.3 0.053 0.148 0.045 0.01 0.23 205 131,131 121,564 0 0 131,131 3.01 452.20 90 1350 22.50 0.2 0.035 0.146 0.030 0.01 0.15 136 131,267 121,615 0 0 131,267 3.01 452.20 91 1365 22.75 0.2 0.035 0.145 0.030 0.01 0.15 136 131,403 121,665 0 0 131,403 3.02 452.20 92 1380 23.00 0.2 0.035 0.144 0.030 0.01 0.15 136 131,540 121,716 0 0 131,540 3.02 452.20 93 1395 23.25 0.2 0.035 0.143 0.030 0.01 0.15 136 131,676 121,767 0 0 131,676 3.02 452.20 94 1410 23.50 0.2 0.035 0.142 0.030 0.01 0.15 136 131,813 121,818 0 0 131,813 3.03 452.20 95 1425 23.75 0.2 0.035 0.141 0.030 0.01 0.15 136 131,949 121,869 0 0 131,949 3.03 452.20 96 1440 24.00 0.2 0.035 0.141 0.030 0.01 0.15 136 132,086 121,920 0 0 132,086 3.03 452.20 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 0 cu-ft 0.00 cf/min 1.28 in 3.03 acft 132,086 cu-ft 3.03 acft 132,086 cu-ft 4.41 in 454,686 cu-ft 322,600 cu-ft 452.20 ft 10.24 cfs Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL BASIN D BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 1.707 D 56 0.51 1.00 4 B SF - LOW DENSITY 48.170 D 56 0.51 0.30 6 B SF - HIGH DENSITY 4.271 D 56 0.51 0.50 9 B LANDSCAPING 7.654 D 56 0.51 0.10 1,560 ft 780 ft 490.0 ft ELEVATION OF CONCENTRATION POINT 455.0 ft 0.02 100 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in BASIN CHARACTERISTICS:ELEVATION 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 PERCOLATION RATE (in/hr)1.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 BASIN E AMC NUMBER RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention DA-E Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)323,053 480,092 619,184 989,349 SOIL LOSSES (cu-ft)82,659 237,971 372,822 769,875 EFFECTIVE RAIN (in)1.07 1.08 1.10 0.98 FLOOD VOLUME (cu-ft)240,394 242,121 246,363 219,473 acre-ft)5.52 5.56 5.66 5.04 REQUIRED STORAGE (cu-ft)221,456 193,888 172,408 59,359 acre-ft)5.08 4.45 3.96 1.36 FACTOR OF SAFETY 5.49 6.27 7.06 20.49 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 108.26 92.62 17.61 MAXIMUM WSEL (ft)442.97 442.85 442.76 442.26 DEPTH (ft)0.97 0.85 0.76 0.26 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days)0.5 0.6 0.8 1.0 BASIN E DA-E CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 61.802 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION 3] AREA - ACRES 4] L-FEET 5] L-MILES 1560 0.295 13] L*LCA/S^0.5 10.88 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.004 780.00 12] S^0.5 0.148 118.5 490 455 35 0.02 17] 100% OF LAG-MINUTES 3.5 3.5 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.06 16] LAG TIME-MINUTES 18] 200% OF LAG-MINUTES RAINFALL DATA 7.1 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. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 1,216,389 27.92 Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 1.707 0.028 0.0014 DEVELOPED 0.1000 0.0028 B 56 0.51 30%0.37 48.170 0.779 0.2902 DEVELOPED 0.6600 0.5144 B 56 0.51 50%0.28 4.271 0.069 0.0194 DEVELOPED 0.5000 0.0346 B 56 0.51 10%0.46 7.654 0.124 0.0575 DEVELOPED 0.8200 0.1016 SUM 61.802 SUM 0.3685 0.6533 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.184225307 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00341 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00341 0.18 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.3685 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE SF - LOW DENSITY SF - HIGH DENSITY LANDSCAPING Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 61.80 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.54 Maxwell Drywells UNIT TIME-PERCENT OF LAG 141.4 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.44 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.37 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.62 0.37 0.53 0.25 15.81 4,742 4,742 224,709 1,560 1,560 3,181 0.07 442.01 2 10 0.17 4.2 0.73 0.37 0.62 0.36 22.27 6,680 9,861 224,876 1,562 1,562 8,299 0.19 442.04 3 15 0.25 4.4 0.76 0.37 0.65 0.39 24.42 7,326 15,626 225,063 1,563 1,563 14,063 0.32 442.06 4 20 0.33 4.6 0.79 0.37 0.68 0.43 26.57 7,972 22,035 225,272 1,564 1,564 20,470 0.47 442.09 5 25 0.42 5.0 0.86 0.37 0.73 0.50 30.88 9,264 29,735 225,522 1,566 1,566 28,169 0.65 442.12 6 30 0.50 5.6 0.97 0.37 0.82 0.60 37.34 11,203 39,371 225,836 1,568 1,568 37,803 0.87 442.17 7 35 0.58 6.4 1.11 0.37 0.94 0.74 45.96 13,787 51,590 226,233 1,571 1,571 50,019 1.15 442.22 8 40 0.67 8.1 1.40 0.37 1.19 1.03 64.26 19,279 69,298 226,809 1,575 1,575 67,723 1.55 442.30 9 45 0.75 13.1 2.26 0.37 1.92 1.90 118.11 35,432 103,155 227,911 1,583 1,583 101,572 2.33 442.44 10 50 0.83 34.5 5.96 0.37 5.07 5.59 348.55 104,565 206,137 231,260 1,606 1,606 204,531 4.70 442.90 11 55 0.92 6.7 1.16 0.37 0.98 0.79 49.19 14,756 219,287 231,688 1,609 1,609 217,678 5.00 442.95 12 60 1.00 3.8 0.66 0.37 0.56 0.29 17.96 5,388 223,066 231,811 1,610 1,610 221,456 5.08 442.97 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 323,053 cu-ft SOIL LOSSES 82,659 cu-ft EFFECTIVE RAIN 1.07 in FLOOD VOLUME 5.52 acft FLOOD VOLUME 240,394 cu-ft REQUIRED STORAGE 5.08 REQUIRED STORAGE 221,456 cu-ft MAX WSEL 442.97 ft PEAK FLOW RATE 348.55 cfs TOTAL BASIN LOSSES 18,937 cu-ft AVERAGE PERCOLATION RATE 315.62 cf/min CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 61.80 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.54 Maxwell Drywells UNIT TIME-PERCENT OF LAG 141.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.37 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.33 0.37 0.28 0.05 3.12 936 936 224,585 1,560 936 0 0.00 442.00 2 10 0.17 1.3 0.33 0.37 0.28 0.05 3.12 936 936 224,585 1,560 936 0 0.00 442.00 3 15 0.25 1.1 0.28 0.37 0.24 0.04 2.64 792 792 224,581 1,560 792 0 0.00 442.00 4 20 0.33 1.5 0.39 0.37 0.33 0.02 1.04 313 313 224,565 1,559 313 0 0.00 442.00 5 25 0.42 1.5 0.39 0.37 0.33 0.02 1.04 313 313 224,565 1,559 313 0 0.00 442.00 6 30 0.50 1.8 0.46 0.37 0.39 0.09 5.84 1,753 1,753 224,612 1,560 1,560 194 0.00 442.00 7 35 0.58 1.5 0.39 0.37 0.33 0.02 1.04 313 507 224,571 1,560 507 0 0.00 442.00 8 40 0.67 1.8 0.46 0.37 0.39 0.09 5.84 1,753 1,753 224,612 1,560 1,560 194 0.00 442.00 9 45 0.75 1.8 0.46 0.37 0.39 0.09 5.84 1,753 1,947 224,618 1,560 1,560 387 0.01 442.00 10 50 0.83 1.5 0.39 0.37 0.33 0.02 1.04 313 700 224,578 1,560 700 0 0.00 442.00 11 55 0.92 1.6 0.41 0.37 0.35 0.04 2.64 793 793 224,581 1,560 793 0 0.00 442.00 12 60 1.00 1.8 0.46 0.37 0.39 0.09 5.84 1,753 1,753 224,612 1,560 1,560 194 0.00 442.00 13 65 1.08 2.2 0.56 0.37 0.48 0.20 12.25 3,674 3,867 224,681 1,560 1,560 2,307 0.05 442.01 14 70 1.17 2.2 0.56 0.37 0.48 0.20 12.25 3,674 5,981 224,750 1,561 1,561 4,420 0.10 442.02 15 75 1.25 2.2 0.56 0.37 0.48 0.20 12.25 3,674 8,094 224,818 1,561 1,561 6,533 0.15 442.03 16 80 1.33 2.0 0.51 0.37 0.44 0.15 9.05 2,714 9,246 224,856 1,561 1,561 7,685 0.18 442.03 17 85 1.42 2.6 0.67 0.37 0.57 0.30 18.65 5,594 13,279 224,987 1,562 1,562 11,716 0.27 442.05 18 90 1.50 2.7 0.69 0.37 0.59 0.32 20.25 6,074 17,791 225,134 1,563 1,563 16,227 0.37 442.07 19 95 1.58 2.4 0.62 0.37 0.52 0.25 15.45 4,634 20,861 225,234 1,564 1,564 19,297 0.44 442.08 20 100 1.67 2.7 0.69 0.37 0.59 0.32 20.25 6,074 25,371 225,380 1,565 1,565 23,806 0.55 442.10 21 105 1.75 3.3 0.85 0.37 0.72 0.48 29.85 8,955 32,761 225,621 1,567 1,567 31,194 0.72 442.14 22 110 1.83 3.1 0.80 0.37 0.68 0.43 26.65 7,995 39,189 225,830 1,568 1,568 37,621 0.86 442.16 23 115 1.92 2.9 0.74 0.37 0.63 0.38 23.45 7,034 44,655 226,008 1,569 1,569 43,085 0.99 442.19 24 120 2.00 3.0 0.77 0.37 0.65 0.40 25.05 7,515 50,600 226,201 1,571 1,571 49,029 1.13 442.21 25 125 2.08 3.1 0.80 0.37 0.68 0.43 26.65 7,995 57,024 226,410 1,572 1,572 55,451 1.27 442.24 Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 61.80 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.54 Maxwell Drywells UNIT TIME-PERCENT OF LAG 141.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.37 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 1.08 0.37 0.92 0.71 44.25 13,276 68,727 226,791 1,575 1,575 67,152 1.54 442.29 27 135 2.25 5.0 1.28 0.37 1.09 0.92 57.05 17,116 84,269 227,296 1,578 1,578 82,690 1.90 442.36 28 140 2.33 3.5 0.90 0.37 0.76 0.53 33.05 9,915 92,605 227,567 1,580 1,580 91,025 2.09 442.40 29 145 2.42 6.8 1.75 0.37 1.48 1.38 85.86 25,758 116,783 228,354 1,586 1,586 115,197 2.64 442.50 30 150 2.50 7.3 1.87 0.37 1.59 1.51 93.86 28,158 143,355 229,218 1,592 1,592 141,764 3.25 442.62 31 155 2.58 8.2 2.11 0.37 1.79 1.74 108.26 32,479 174,243 230,223 1,599 1,599 172,644 3.96 442.76 32 160 2.67 5.9 1.52 0.37 1.29 1.15 71.46 21,437 194,081 230,868 1,603 1,603 192,478 4.42 442.84 33 165 2.75 2.0 0.51 0.37 0.44 0.15 9.05 2,714 195,192 230,904 1,604 1,604 193,588 4.44 442.85 34 170 2.83 1.8 0.46 0.37 0.39 0.09 5.84 1,753 195,342 230,909 1,604 1,604 193,738 4.45 442.85 35 175 2.92 1.8 0.46 0.37 0.39 0.09 5.84 1,753 195,491 230,914 1,604 1,604 193,888 4.45 442.85 36 180 3.00 0.6 0.15 0.37 0.13 0.02 1.44 432 194,320 230,876 1,603 1,603 192,717 4.42 442.84 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 237,971 cu-ft 2.14 in 480,092 cu-ft 442.85 ft 108.26 cfs 49,404 cu-ft 274.47 cf/min 1.08 in 5.56 acft 242,121 cu-ft 4.45 acft 193,888 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 61.80 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.54 Maxwell Drywells UNIT TIME-PERCENT OF LAG 141.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.37 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.17 0.37 0.14 0.02 1.55 464 464 224,570 1,560 464 0 0.00 442.00 2 10 0.17 0.6 0.20 0.37 0.17 0.03 1.86 557 557 224,573 1,560 557 0 0.00 442.00 3 15 0.25 0.6 0.20 0.37 0.17 0.03 1.86 557 557 224,573 1,560 557 0 0.00 442.00 4 20 0.33 0.6 0.20 0.37 0.17 0.03 1.86 557 557 224,573 1,560 557 0 0.00 442.00 5 25 0.42 0.6 0.20 0.37 0.17 0.03 1.86 557 557 224,573 1,560 557 0 0.00 442.00 6 30 0.50 0.7 0.23 0.37 0.20 0.03 2.17 650 650 224,576 1,560 650 0 0.00 442.00 7 35 0.58 0.7 0.23 0.37 0.20 0.03 2.17 650 650 224,576 1,560 650 0 0.00 442.00 8 40 0.67 0.7 0.23 0.37 0.20 0.03 2.17 650 650 224,576 1,560 650 0 0.00 442.00 9 45 0.75 0.7 0.23 0.37 0.20 0.03 2.17 650 650 224,576 1,560 650 0 0.00 442.00 10 50 0.83 0.7 0.23 0.37 0.20 0.03 2.17 650 650 224,576 1,560 650 0 0.00 442.00 11 55 0.92 0.7 0.23 0.37 0.20 0.03 2.17 650 650 224,576 1,560 650 0 0.00 442.00 12 60 1.00 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 13 65 1.08 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 14 70 1.17 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 15 75 1.25 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 16 80 1.33 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 17 85 1.42 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 18 90 1.50 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 19 95 1.58 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 20 100 1.67 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 21 105 1.75 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 22 110 1.83 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 23 115 1.92 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 24 120 2.00 0.9 0.30 0.37 0.25 0.04 2.79 836 836 224,582 1,560 836 0 0.00 442.00 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 61.80 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.54 Maxwell Drywells UNIT TIME-PERCENT OF LAG 141.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.37 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.26 0.37 0.23 0.04 2.48 743 743 224,579 1,560 743 0 0.00 442.00 26 130 2.17 0.9 0.30 0.37 0.25 0.04 2.79 836 836 224,582 1,560 836 0 0.00 442.00 27 135 2.25 0.9 0.30 0.37 0.25 0.04 2.79 836 836 224,582 1,560 836 0 0.00 442.00 28 140 2.33 0.9 0.30 0.37 0.25 0.04 2.79 836 836 224,582 1,560 836 0 0.00 442.00 29 145 2.42 0.9 0.30 0.37 0.25 0.04 2.79 836 836 224,582 1,560 836 0 0.00 442.00 30 150 2.50 0.9 0.30 0.37 0.25 0.04 2.79 836 836 224,582 1,560 836 0 0.00 442.00 31 155 2.58 0.9 0.30 0.37 0.25 0.04 2.79 836 836 224,582 1,560 836 0 0.00 442.00 32 160 2.67 0.9 0.30 0.37 0.25 0.04 2.79 836 836 224,582 1,560 836 0 0.00 442.00 33 165 2.75 1.0 0.33 0.37 0.28 0.05 3.10 929 929 224,585 1,560 929 0 0.00 442.00 34 170 2.83 1.0 0.33 0.37 0.28 0.05 3.10 929 929 224,585 1,560 929 0 0.00 442.00 35 175 2.92 1.0 0.33 0.37 0.28 0.05 3.10 929 929 224,585 1,560 929 0 0.00 442.00 36 180 3.00 1.0 0.33 0.37 0.28 0.05 3.10 929 929 224,585 1,560 929 0 0.00 442.00 37 185 3.08 1.0 0.33 0.37 0.28 0.05 3.10 929 929 224,585 1,560 929 0 0.00 442.00 38 190 3.17 1.1 0.36 0.37 0.31 0.05 3.41 1,022 1,022 224,588 1,560 1,022 0 0.00 442.00 39 195 3.25 1.1 0.36 0.37 0.31 0.05 3.41 1,022 1,022 224,588 1,560 1,022 0 0.00 442.00 40 200 3.33 1.1 0.36 0.37 0.31 0.05 3.41 1,022 1,022 224,588 1,560 1,022 0 0.00 442.00 41 205 3.42 1.2 0.40 0.37 0.34 0.03 1.81 542 542 224,573 1,560 542 0 0.00 442.00 42 210 3.50 1.3 0.43 0.37 0.37 0.06 3.87 1,161 1,161 224,593 1,560 1,161 0 0.00 442.00 43 215 3.58 1.4 0.46 0.37 0.39 0.10 5.93 1,780 1,780 224,613 1,560 1,560 221 0.01 442.00 44 220 3.67 1.4 0.46 0.37 0.39 0.10 5.93 1,780 2,001 224,620 1,560 1,560 441 0.01 442.00 45 225 3.75 1.5 0.50 0.37 0.42 0.13 8.00 2,400 2,841 224,647 1,560 1,560 1,280 0.03 442.01 46 230 3.83 1.5 0.50 0.37 0.42 0.13 8.00 2,400 3,680 224,675 1,560 1,560 2,120 0.05 442.01 47 235 3.92 1.6 0.53 0.37 0.45 0.16 10.06 3,019 5,138 224,722 1,561 1,561 3,578 0.08 442.02 48 240 4.00 1.6 0.53 0.37 0.45 0.16 10.06 3,019 6,597 224,770 1,561 1,561 5,036 0.12 442.02 49 245 4.08 1.7 0.56 0.37 0.48 0.19 12.13 3,638 8,674 224,837 1,561 1,561 7,112 0.16 442.03 50 250 4.17 1.8 0.60 0.37 0.51 0.23 14.19 4,257 11,369 224,925 1,562 1,562 9,807 0.23 442.04 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 61.80 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 3.54 Maxwell Drywells UNIT TIME-PERCENT OF LAG 141.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.37 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.63 0.37 0.53 0.26 16.25 4,876 14,684 225,033 1,563 1,563 13,121 0.30 442.06 52 260 4.33 2.0 0.66 0.37 0.56 0.29 18.32 5,495 18,616 225,161 1,564 1,564 17,053 0.39 442.07 53 265 4.42 2.1 0.70 0.37 0.59 0.33 20.38 6,115 23,167 225,309 1,565 1,565 21,603 0.50 442.09 54 270 4.50 2.1 0.70 0.37 0.59 0.33 20.38 6,115 27,717 225,457 1,566 1,566 26,152 0.60 442.11 55 275 4.58 2.2 0.73 0.37 0.62 0.36 22.45 6,734 32,885 225,625 1,567 1,567 31,318 0.72 442.14 56 280 4.67 2.3 0.76 0.37 0.65 0.39 24.51 7,353 38,671 225,813 1,568 1,568 37,103 0.85 442.16 57 285 4.75 2.4 0.79 0.37 0.68 0.43 26.57 7,972 45,076 226,021 1,570 1,570 43,506 1.00 442.19 58 290 4.83 2.4 0.79 0.37 0.68 0.43 26.57 7,972 51,478 226,230 1,571 1,571 49,907 1.15 442.22 59 295 4.92 2.5 0.83 0.37 0.70 0.46 28.64 8,591 58,498 226,458 1,573 1,573 56,926 1.31 442.25 60 300 5.00 2.6 0.86 0.37 0.73 0.49 30.70 9,211 66,136 226,706 1,574 1,574 64,562 1.48 442.28 61 305 5.08 3.1 1.03 0.37 0.87 0.66 41.02 12,306 76,868 227,055 1,577 1,577 75,292 1.73 442.33 62 310 5.17 3.6 1.19 0.37 1.01 0.82 51.34 15,402 90,694 227,505 1,580 1,580 89,114 2.05 442.39 63 315 5.25 3.9 1.29 0.37 1.10 0.92 57.53 17,260 106,374 228,015 1,583 1,583 104,791 2.41 442.46 64 320 5.33 4.2 1.39 0.37 1.18 1.02 63.72 19,117 123,908 228,586 1,587 1,587 122,321 2.81 442.54 65 325 5.42 4.7 1.56 0.37 1.32 1.19 74.04 22,213 144,534 229,257 1,592 1,592 142,942 3.28 442.63 66 330 5.50 5.6 1.85 0.37 1.58 1.49 92.62 27,786 170,728 230,109 1,598 1,598 169,130 3.88 442.74 67 335 5.58 1.9 0.63 0.37 0.53 0.26 16.25 4,876 174,006 230,215 1,599 1,599 172,408 3.96 442.76 68 340 5.67 0.9 0.30 0.37 0.25 0.04 2.79 836 173,244 230,190 1,599 1,599 171,645 3.94 442.75 69 345 5.75 0.6 0.20 0.37 0.17 0.03 1.86 557 172,202 230,157 1,598 1,598 170,604 3.92 442.75 70 350 5.83 0.5 0.17 0.37 0.14 0.02 1.55 464 171,068 230,120 1,598 1,598 169,470 3.89 442.74 71 355 5.92 0.3 0.10 0.37 0.08 0.01 0.93 279 169,749 230,077 1,598 1,598 168,151 3.86 442.74 72 360 6.00 0.2 0.07 0.37 0.06 0.01 0.62 186 168,337 230,031 1,597 1,597 166,740 3.83 442.73 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 619,184 cu-ft 2.76 in 372,822 cu-ft 442.76 ft 92.62 cfs 221.18 cf/min 79,623 cu-ft 1.10 in 5.66 acft 246,363 cu-ft 3.96 acft 172,408 cu-ft EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 61.80 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.18 LAG TIME - MINUTES 3.54 C 0.00341 Maxwell Drywells UNIT TIME-PERCENT OF LAG 424%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.035 0.651 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 2 30 0.50 0.3 0.053 0.643 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 3 45 0.75 0.3 0.053 0.636 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 4 60 1.00 0.4 0.071 0.628 0.060 0.01 0.66 594 594 224,574 4,679 594 0 0.00 442.00 5 75 1.25 0.3 0.053 0.621 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 6 90 1.50 0.3 0.053 0.613 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 7 105 1.75 0.3 0.053 0.606 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 8 120 2.00 0.4 0.071 0.599 0.060 0.01 0.66 594 594 224,574 4,679 594 0 0.00 442.00 9 135 2.25 0.4 0.071 0.591 0.060 0.01 0.66 594 594 224,574 4,679 594 0 0.00 442.00 10 150 2.50 0.4 0.071 0.584 0.060 0.01 0.66 594 594 224,574 4,679 594 0 0.00 442.00 11 165 2.75 0.5 0.088 0.577 0.075 0.01 0.82 742 742 224,579 4,679 742 0 0.00 442.00 12 180 3.00 0.5 0.088 0.570 0.075 0.01 0.82 742 742 224,579 4,679 742 0 0.00 442.00 13 195 3.25 0.5 0.088 0.563 0.075 0.01 0.82 742 742 224,579 4,679 742 0 0.00 442.00 14 210 3.50 0.5 0.088 0.556 0.075 0.01 0.82 742 742 224,579 4,679 742 0 0.00 442.00 15 225 3.75 0.5 0.088 0.549 0.075 0.01 0.82 742 742 224,579 4,679 742 0 0.00 442.00 16 240 4.00 0.6 0.106 0.542 0.090 0.02 0.99 890 890 224,584 4,679 890 0 0.00 442.00 17 255 4.25 0.6 0.106 0.535 0.090 0.02 0.99 890 890 224,584 4,679 890 0 0.00 442.00 18 270 4.50 0.7 0.123 0.528 0.105 0.02 1.15 1,039 1,039 224,589 4,679 1,039 0 0.00 442.00 19 285 4.75 0.7 0.123 0.522 0.105 0.02 1.15 1,039 1,039 224,589 4,679 1,039 0 0.00 442.00 20 300 5.00 0.8 0.141 0.515 0.120 0.02 1.32 1,187 1,187 224,594 4,679 1,187 0 0.00 442.00 21 315 5.25 0.6 0.106 0.508 0.090 0.02 0.99 890 890 224,584 4,679 890 0 0.00 442.00 22 330 5.50 0.7 0.123 0.502 0.105 0.02 1.15 1,039 1,039 224,589 4,679 1,039 0 0.00 442.00 23 345 5.75 0.8 0.141 0.495 0.120 0.02 1.32 1,187 1,187 224,594 4,679 1,187 0 0.00 442.00 24 360 6.00 0.8 0.141 0.489 0.120 0.02 1.32 1,187 1,187 224,594 4,679 1,187 0 0.00 442.00 25 375 6.25 0.9 0.159 0.482 0.135 0.02 1.48 1,336 1,336 224,598 4,679 1,336 0 0.00 442.00 26 390 6.50 0.9 0.159 0.476 0.135 0.02 1.48 1,336 1,336 224,598 4,679 1,336 0 0.00 442.00 27 405 6.75 1.0 0.176 0.469 0.150 0.03 1.65 1,484 1,484 224,603 4,679 1,484 0 0.00 442.00 28 420 7.00 1.0 0.176 0.463 0.150 0.03 1.65 1,484 1,484 224,603 4,679 1,484 0 0.00 442.00 29 435 7.25 1.0 0.176 0.457 0.150 0.03 1.65 1,484 1,484 224,603 4,679 1,484 0 0.00 442.00 30 450 7.50 1.1 0.194 0.450 0.165 0.03 1.81 1,632 1,632 224,608 4,679 1,632 0 0.00 442.00 31 465 7.75 1.2 0.212 0.444 0.180 0.03 1.98 1,781 1,781 224,613 4,679 1,781 0 0.00 442.00 32 480 8.00 1.3 0.229 0.438 0.195 0.03 2.14 1,929 1,929 224,618 4,680 1,929 0 0.00 442.00 33 495 8.25 1.5 0.265 0.432 0.225 0.04 2.47 2,226 2,226 224,627 4,680 2,226 0 0.00 442.00 34 510 8.50 1.5 0.265 0.426 0.225 0.04 2.47 2,226 2,226 224,627 4,680 2,226 0 0.00 442.00 35 525 8.75 1.6 0.282 0.420 0.240 0.04 2.64 2,374 2,374 224,632 4,680 2,374 0 0.00 442.00 36 540 9.00 1.7 0.300 0.414 0.255 0.04 2.80 2,523 2,523 224,637 4,680 2,523 0 0.00 442.00 37 555 9.25 1.9 0.335 0.408 0.285 0.05 3.13 2,820 2,820 224,647 4,680 2,820 0 0.00 442.00 38 570 9.50 2.0 0.353 0.402 0.300 0.05 3.30 2,968 2,968 224,652 4,680 2,968 0 0.00 442.00 39 585 9.75 2.1 0.370 0.397 0.315 0.06 3.46 3,116 3,116 224,656 4,680 3,116 0 0.00 442.00 40 600 10.00 2.2 0.388 0.391 0.330 0.06 3.63 3,265 3,265 224,661 4,680 3,265 0 0.00 442.00 41 615 10.25 1.5 0.265 0.385 0.225 0.04 2.47 2,226 2,226 224,627 4,680 2,226 0 0.00 442.00 42 630 10.50 1.5 0.265 0.380 0.225 0.04 2.47 2,226 2,226 224,627 4,680 2,226 0 0.00 442.00 43 645 10.75 2.0 0.353 0.374 0.300 0.05 3.30 2,968 2,968 224,652 4,680 2,968 0 0.00 442.00 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 61.80 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.18 LAG TIME - MINUTES 3.54 C 0.00341 Maxwell Drywells UNIT TIME-PERCENT OF LAG 424%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 44 660 11.00 2.0 0.353 0.369 0.300 0.05 3.30 2,968 2,968 224,652 4,680 2,968 0 0.00 442.00 45 675 11.25 1.9 0.335 0.363 0.285 0.05 3.13 2,820 2,820 224,647 4,680 2,820 0 0.00 442.00 46 690 11.50 1.9 0.335 0.358 0.285 0.05 3.13 2,820 2,820 224,647 4,680 2,820 0 0.00 442.00 47 705 11.75 1.7 0.300 0.353 0.255 0.04 2.80 2,523 2,523 224,637 4,680 2,523 0 0.00 442.00 48 720 12.00 1.8 0.318 0.347 0.270 0.05 2.97 2,671 2,671 224,642 4,680 2,671 0 0.00 442.00 49 735 12.25 2.5 0.441 0.342 0.375 0.10 6.16 5,540 5,540 224,735 4,682 4,682 858 0.02 442.00 50 750 12.50 2.6 0.459 0.337 0.390 0.12 7.57 6,817 7,675 224,805 4,683 4,683 2,992 0.07 442.01 51 765 12.75 2.8 0.494 0.332 0.420 0.16 10.09 9,080 12,072 224,948 4,686 4,686 7,385 0.17 442.03 52 780 13.00 2.9 0.512 0.327 0.435 0.18 11.50 10,350 17,735 225,132 4,690 4,690 13,045 0.30 442.06 53 795 13.25 3.4 0.600 0.322 0.510 0.28 17.30 15,574 28,619 225,486 4,698 4,698 23,921 0.55 442.10 54 810 13.50 3.4 0.600 0.317 0.510 0.28 17.61 15,848 39,769 225,849 4,705 4,705 35,064 0.80 442.15 55 825 13.75 2.3 0.406 0.312 0.345 0.09 5.82 5,235 40,299 225,866 4,706 4,706 35,593 0.82 442.16 56 840 14.00 2.3 0.406 0.308 0.345 0.10 6.11 5,502 41,095 225,892 4,706 4,706 36,389 0.84 442.16 57 855 14.25 2.7 0.476 0.303 0.405 0.17 10.80 9,722 46,111 226,055 4,709 4,709 41,401 0.95 442.18 58 870 14.50 2.6 0.459 0.298 0.390 0.16 9.99 8,992 50,393 226,194 4,712 4,712 45,681 1.05 442.20 59 885 14.75 2.6 0.459 0.294 0.390 0.16 10.28 9,248 54,929 226,342 4,715 4,715 50,214 1.15 442.22 60 900 15.00 2.5 0.441 0.289 0.375 0.15 9.46 8,511 58,724 226,465 4,718 4,718 54,006 1.24 442.24 61 915 15.25 2.4 0.423 0.285 0.360 0.14 8.63 7,770 61,776 226,565 4,720 4,720 57,056 1.31 442.25 62 930 15.50 2.3 0.406 0.280 0.345 0.13 7.81 7,025 64,080 226,639 4,722 4,722 59,359 1.36 442.26 63 945 15.75 1.9 0.335 0.276 0.285 0.06 3.68 3,308 62,666 226,593 4,721 4,721 57,946 1.33 442.25 64 960 16.00 1.9 0.335 0.272 0.285 0.06 3.94 3,544 61,490 226,555 4,720 4,720 56,770 1.30 442.25 65 975 16.25 0.4 0.071 0.268 0.060 0.01 0.66 594 57,364 226,421 4,717 4,717 52,647 1.21 442.23 66 990 16.50 0.4 0.071 0.264 0.060 0.01 0.66 594 53,240 226,287 4,714 4,714 48,526 1.11 442.21 67 1005 16.75 0.3 0.053 0.260 0.045 0.01 0.49 445 48,971 226,148 4,711 4,711 44,260 1.02 442.19 68 1020 17.00 0.3 0.053 0.256 0.045 0.01 0.49 445 44,705 226,009 4,709 4,709 39,997 0.92 442.18 69 1035 17.25 0.5 0.088 0.252 0.075 0.01 0.82 742 40,739 225,880 4,706 4,706 36,033 0.83 442.16 70 1050 17.50 0.5 0.088 0.248 0.075 0.01 0.82 742 36,775 225,751 4,703 4,703 32,072 0.74 442.14 71 1065 17.75 0.5 0.088 0.244 0.075 0.01 0.82 742 32,814 225,622 4,700 4,700 28,113 0.65 442.12 72 1080 18.00 0.4 0.071 0.241 0.060 0.01 0.66 594 28,707 225,489 4,698 4,698 24,009 0.55 442.11 73 1095 18.25 0.4 0.071 0.237 0.060 0.01 0.66 594 24,603 225,355 4,695 4,695 19,908 0.46 442.09 74 1110 18.50 0.4 0.071 0.234 0.060 0.01 0.66 594 20,501 225,222 4,692 4,692 15,809 0.36 442.07 75 1125 18.75 0.3 0.053 0.230 0.045 0.01 0.49 445 16,254 225,084 4,689 4,689 11,565 0.27 442.05 76 1140 19.00 0.2 0.035 0.227 0.030 0.01 0.33 297 11,862 224,941 4,686 4,686 7,176 0.16 442.03 77 1155 19.25 0.3 0.053 0.224 0.045 0.01 0.49 445 7,621 224,803 4,683 4,683 2,938 0.07 442.01 78 1170 19.50 0.4 0.071 0.221 0.060 0.01 0.66 594 3,531 224,670 4,681 3,531 0 0.00 442.00 79 1185 19.75 0.3 0.053 0.218 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 80 1200 20.00 0.2 0.035 0.215 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 81 1215 20.25 0.3 0.053 0.212 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 82 1230 20.50 0.3 0.053 0.209 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 83 1245 20.75 0.3 0.053 0.207 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 84 1260 21.00 0.2 0.035 0.204 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 85 1275 21.25 0.3 0.053 0.202 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 86 1290 21.50 0.2 0.035 0.199 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 61.80 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.18 LAG TIME - MINUTES 3.54 C 0.00341 Maxwell Drywells UNIT TIME-PERCENT OF LAG 424%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 87 1305 21.75 0.3 0.053 0.197 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 88 1320 22.00 0.2 0.035 0.195 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 89 1335 22.25 0.3 0.053 0.193 0.045 0.01 0.49 445 445 224,569 4,679 445 0 0.00 442.00 90 1350 22.50 0.2 0.035 0.191 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 91 1365 22.75 0.2 0.035 0.190 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 92 1380 23.00 0.2 0.035 0.188 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 93 1395 23.25 0.2 0.035 0.187 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 94 1410 23.50 0.2 0.035 0.186 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 95 1425 23.75 0.2 0.035 0.185 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 96 1440 24.00 0.2 0.035 0.184 0.030 0.01 0.33 297 297 224,565 4,678 297 0 0.00 442.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 4.41 in 989,349 cu-ft 769,875 cu-ft 442.26 ft 17.61 cfs 219,473 cu-ft 152.41 cf/min 0.98 in 5.04 acft 219,473 cu-ft 1.36 acft 59,359 cu-ft Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL BASIN E BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 DLS 2553 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 0.353 D 56 0.51 1.00 4 B SF - LOW DENSITY 42.760 D 56 0.51 0.30 9 B LANDSCAPING 1.698 D 56 0.51 0.10 2,000 ft 1,000 ft 467.0 ft ELEVATION OF CONCENTRATION POINT 455.0 ft 0.02 100 LOW LOSS RATE (For Storms Greater Than 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) AMC NUMBER LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME March 30, 2020 PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION CORAL MOUNTAIN FUTURE BASIN DA-F PROJECT: Job No.: BY:DATE:3/30/20 1] AMC 2] FREQUENCY-YEARS NOAA ATLAS 3] DURATION: 1-HOUR 3-HOUR 6-HOUR 24-HOUR 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 RAINFALL DATA 18] 200% OF LAG-MINUTES STORM EVENT SUMMARY 11.0 II 100 14 Point Rain 1.44 in 2.14 in 2.76 in 4.41 in 8] ELEVATION OF HEADWATER 0.013 1000.00 12] S^0.5 0.189 0.02 17] 100% OF LAG-MINUTES 5.5 5.5 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.09 16] LAG TIME-MINUTES 2000 DLS 0.379 467 455 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD FUTURE BASIN DA-F CORAL MOUNTAIN 2] AREA DESIGNATION HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 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. 44.811 PHYSICAL DATA 1] CONCENTRATION POINT 10] H-FEET 31.7 3] AREA - ACRES 4] L-FEET 5] L-MILES 13] L*LCA/S^0.5 5.63 11] S-FEET/MILE 6] La-FEET 7] La-MILES 12 9] ELEVATION OF CONCENTRATION POINT Plate E-2.1 Page 2 of 9 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 0.353 0.008 0.0004 DEVELOPED 0.1000 0.0008 B 56 0.51 30%0.37 42.760 0.954 0.3553 DEVELOPED 0.6600 0.6298 B 56 0.51 10%0.46 1.698 0.038 0.0176 DEVELOPED 0.8200 0.0311 SUM 44.811 SUM 0.3732 0.6617 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.18662374 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00346 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55 =0.00346 0.19 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.3732 in/hr Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 in/hr Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. AMC II AVERAGE ADJUSTED LOSS RATE 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING CORAL MOUNTAIN DLS 2553 RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM Plate E-2.1 Page 3 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)1.44 RAINFALL VOLUME (cuft)234,237 SOIL LOSSES (cuft)60,714 EFFECTIVE RAIN (in)1.07 FLOOD VOLUME (acft)3.98 FLOOD VOLUME (cuft)173,523 PEAK FLOW RATE (cfs)252.51 in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)2.14 RAINFALL VOLUME (cuft)348,102 SOIL LOSSES (cuft)174,628 EFFECTIVE RAIN (in)1.07 FLOOD VOLUME (acft)3.98 FLOOD VOLUME (cuft)173,475 PEAK FLOW RATE (cfs)78.28 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3-HOUR STORM RCFC & WCD HYDROLOGY Plate E-2.2 3-Hour Storm Page 5 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD Plate E-2.2 6-Hour Storm Page 6 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 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 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)2.76 RAINFALL VOLUME (cuft)448,954 SOIL LOSSES (cuft)272,079 EFFECTIVE RAIN (in)1.09 FLOOD VOLUME (acft)4.06 FLOOD VOLUME (cuft)176,875 PEAK FLOW RATE (cfs)66.94 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 44.811 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3732 LAG TIME - MINUTES 5.49 MINIMUM LOSS RATE (for var. loss) - in/hr 0.187 UNIT TIME-PERCENT OF LAG 273.3 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00346 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM Plate E-2.2 24 Hour Storm Page 8 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 44.811 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3732 LAG TIME - MINUTES 5.49 MINIMUM LOSS RATE (for var. loss) - in/hr 0.187 UNIT TIME-PERCENT OF LAG 273.3 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00346 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 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)4.41 RAINFALL VOLUME (cuft)717,351 SOIL LOSSES (cuft)560,808 EFFECTIVE RAIN (in)0.96 FLOOD VOLUME (acft)3.59 FLOOD VOLUME (cuft)156,543 PEAK FLOW (cfs)12.58 Plate E-2.2 24 Hour Storm Page 9 of 9 DLS 2553 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 0.316 D 56 0.51 1.00 4 B SF - LOW DENSITY 33.880 D 56 0.51 0.30 9 B LANDSCAPING 1.546 D 56 0.51 0.10 ELEVATION OF CONCENTRATION POINT 100 LOW LOSS RATE (For Storms Greater Than 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION CORAL MOUNTAIN FUTURE BASIN DA-G RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME March 30, 2020 ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) AMC NUMBER LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention PROJECT: Job No.: BY:DATE:3/30/20 1] AMC 2] FREQUENCY-YEARS NOAA ATLAS 3] DURATION: 1-HOUR 3-HOUR 6-HOUR 24-HOUR 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. 35.742 PHYSICAL DATA 1] CONCENTRATION POINT 10] H-FEET DIV/0! 3] AREA - ACRES 4] L-FEET 5] L-MILES 13] L*LCA/S^0.5 DIV/0! 11] S-FEET/MILE 6] La-FEET 7] La-MILES 0 9] ELEVATION OF CONCENTRATION POINT RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD FUTURE BASIN DA-G CORAL MOUNTAIN 2] AREA DESIGNATION HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 0 DLS 0.000 0 0 0 17] 100% OF LAG-MINUTES DIV/0! DIV/0! 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS #DIV/0! 16] LAG TIME-MINUTES 8] ELEVATION OF HEADWATER DIV/0! 0.00 12] S^0.5 0.000 RAINFALL DATA 18] 200% OF LAG-MINUTES STORM EVENT SUMMARY DIV/0! II 100 14 Point Rain 1.44 in 2.14 in 2.76 in 4.41 in Plate E-2.1 Page 2 of 9 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 0.316 0.009 0.0005 DEVELOPED 0.1000 0.0009 B 56 0.51 30%0.37 33.880 0.948 0.3529 DEVELOPED 0.6600 0.6256 B 56 0.51 10%0.46 1.546 0.043 0.0201 DEVELOPED 0.8200 0.0355 SUM 35.742 SUM 0.3734 0.6620 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.18671505 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00346 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55 =0.00346 0.19 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.3734 in/hr Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 in/hr Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. CORAL MOUNTAIN DLS 2553 RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING AMC II AVERAGE ADJUSTED LOSS RATE Plate E-2.1 Page 3 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)1.44 RAINFALL VOLUME (cuft)186,831 SOIL LOSSES (cuft)48,450 EFFECTIVE RAIN (in)1.07 FLOOD VOLUME (acft)3.18 FLOOD VOLUME (cuft)138,381 PEAK FLOW RATE (cfs)201.40 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)2.14 RAINFALL VOLUME (cuft)277,652 SOIL LOSSES (cuft)139,349 EFFECTIVE RAIN (in)1.07 FLOOD VOLUME (acft)3.17 FLOOD VOLUME (cuft)138,303 PEAK FLOW RATE (cfs)62.43 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3-HOUR STORM RCFC & WCD HYDROLOGY Plate E-2.2 3-Hour Storm Page 5 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM Plate E-2.2 6-Hour Storm Page 6 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM 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)2.76 RAINFALL VOLUME (cuft)358,093 SOIL LOSSES (cuft)217,068 EFFECTIVE RAIN (in)1.09 FLOOD VOLUME (acft)3.24 FLOOD VOLUME (cuft)141,025 PEAK FLOW RATE (cfs)53.39 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 35.742 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3734 LAG TIME - MINUTES #DIV/0!MINIMUM LOSS RATE (for var. loss) - in/hr 0.187 UNIT TIME-PERCENT OF LAG #DIV/0!LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00346 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM Plate E-2.2 24 Hour Storm Page 8 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 35.742 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3734 LAG TIME - MINUTES #DIV/0!MINIMUM LOSS RATE (for var. loss) - in/hr 0.187 UNIT TIME-PERCENT OF LAG #DIV/0!LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00346 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 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)4.41 RAINFALL VOLUME (cuft)572,171 SOIL LOSSES (cuft)447,389 EFFECTIVE RAIN (in)0.96 FLOOD VOLUME (acft)2.86 FLOOD VOLUME (cuft)124,782 PEAK FLOW (cfs)10.03 Plate E-2.2 24 Hour Storm Page 9 of 9 DLS 2553 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 1 B COMMERCIAL 7.118 D 56 0.51 0.90 2 B PAVING/HARDSCAPE 0.000 D 56 0.51 1.00 9 B LANDSCAPING 0.000 D 56 0.51 0.10 ELEVATION OF CONCENTRATION POINT 100 LOW LOSS RATE (For Storms Greater Than 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION CORAL MOUNTAIN FUTURE BASIN DA-H RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME March 30, 2020 ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) AMC NUMBER LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention PROJECT: Job No.: BY:DATE:3/30/20 1] AMC 2] FREQUENCY-YEARS NOAA ATLAS 3] DURATION: 1-HOUR 3-HOUR 6-HOUR 24-HOUR 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. 7.118 PHYSICAL DATA 1] CONCENTRATION POINT 10] H-FEET DIV/0! 3] AREA - ACRES 4] L-FEET 5] L-MILES 13] L*LCA/S^0.5 DIV/0! 11] S-FEET/MILE 6] La-FEET 7] La-MILES 0 9] ELEVATION OF CONCENTRATION POINT RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD FUTURE BASIN DA-H CORAL MOUNTAIN 2] AREA DESIGNATION HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 0 DLS 0.000 0 0 0 17] 100% OF LAG-MINUTES DIV/0! DIV/0! 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS #DIV/0! 16] LAG TIME-MINUTES 8] ELEVATION OF HEADWATER DIV/0! 0.00 12] S^0.5 0.000 RAINFALL DATA 18] 200% OF LAG-MINUTES STORM EVENT SUMMARY DIV/0! II 100 14 Point Rain 1.44 in 2.14 in 2.76 in 4.41 in Plate E-2.1 Page 2 of 9 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 90%0.10 7.118 1.000 0.0969 DEVELOPED 0.1800 0.1800 B 56 0.51 100%0.05 0.000 0.000 0.0000 DEVELOPED 0.1000 0.0000 B 56 0.51 10%0.46 0.000 0.000 0.0000 DEVELOPED 0.8200 0.0000 SUM 7.118 SUM 0.0969 0.1800 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.04845 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00090 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55 =0.00090 0.05 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.0969 in/hr Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 in/hr Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. CORAL MOUNTAIN DLS 2553 RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM 24-(T/60))^1.55 + LAND USE COMMERCIAL PAVING/HARDSCAPE LANDSCAPING AMC II AVERAGE ADJUSTED LOSS RATE Plate E-2.1 Page 3 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)1.44 RAINFALL VOLUME (cuft)37,207 SOIL LOSSES (cuft)2,504 EFFECTIVE RAIN (in)1.34 FLOOD VOLUME (acft)0.80 FLOOD VOLUME (cuft)34,704 PEAK FLOW RATE (cfs)42.09 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)2.14 RAINFALL VOLUME (cuft)55,294 SOIL LOSSES (cuft)7,511 EFFECTIVE RAIN (in)1.85 FLOOD VOLUME (acft)1.10 FLOOD VOLUME (cuft)47,783 PEAK FLOW RATE (cfs)14.42 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3-HOUR STORM RCFC & WCD HYDROLOGY Plate E-2.2 3-Hour Storm Page 5 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM Plate E-2.2 6-Hour Storm Page 6 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM 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)2.76 RAINFALL VOLUME (cuft)71,314 SOIL LOSSES (cuft)14,935 EFFECTIVE RAIN (in)2.18 FLOOD VOLUME (acft)1.29 FLOOD VOLUME (cuft)56,379 PEAK FLOW RATE (cfs)12.62 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 7.118 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.0969 LAG TIME - MINUTES #DIV/0!MINIMUM LOSS RATE (for var. loss) - in/hr 0.048 UNIT TIME-PERCENT OF LAG #DIV/0!LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00090 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM Plate E-2.2 24 Hour Storm Page 8 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 7.118 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.0969 LAG TIME - MINUTES #DIV/0!MINIMUM LOSS RATE (for var. loss) - in/hr 0.048 UNIT TIME-PERCENT OF LAG #DIV/0!LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00090 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 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)4.41 RAINFALL VOLUME (cuft)113,948 SOIL LOSSES (cuft)46,429 EFFECTIVE RAIN (in)2.61 FLOOD VOLUME (acft)1.55 FLOOD VOLUME (cuft)67,518 PEAK FLOW (cfs)3.71 Plate E-2.2 24 Hour Storm Page 9 of 9 DLS 2553 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 0.470 D 56 0.51 1.00 4 B SF - LOW DENSITY 47.890 D 56 0.51 0.30 9 B LANDSCAPING 3.269 D 56 0.51 0.10 ELEVATION OF CONCENTRATION POINT 100 LOW LOSS RATE (For Storms Greater Than 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION CORAL MOUNTAIN FUTURE BASIN DA-I RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME March 30, 2020 ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) AMC NUMBER LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention PROJECT: Job No.: BY:DATE:3/30/20 1] AMC 2] FREQUENCY-YEARS NOAA ATLAS 3] DURATION: 1-HOUR 3-HOUR 6-HOUR 24-HOUR 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. 51.629 PHYSICAL DATA 1] CONCENTRATION POINT 10] H-FEET DIV/0! 3] AREA - ACRES 4] L-FEET 5] L-MILES 13] L*LCA/S^0.5 DIV/0! 11] S-FEET/MILE 6] La-FEET 7] La-MILES 0 9] ELEVATION OF CONCENTRATION POINT RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD FUTURE BASIN DA-I CORAL MOUNTAIN 2] AREA DESIGNATION HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 0 DLS 0.000 0 0 0 17] 100% OF LAG-MINUTES DIV/0! DIV/0! 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS #DIV/0! 16] LAG TIME-MINUTES 8] ELEVATION OF HEADWATER DIV/0! 0.00 12] S^0.5 0.000 RAINFALL DATA 18] 200% OF LAG-MINUTES STORM EVENT SUMMARY DIV/0! II 100 14 Point Rain 1.44 in 2.14 in 2.76 in 4.41 in Plate E-2.1 Page 2 of 9 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 0.470 0.009 0.0005 DEVELOPED 0.1000 0.0009 B 56 0.51 30%0.37 47.890 0.928 0.3453 DEVELOPED 0.6600 0.6122 B 56 0.51 10%0.46 3.269 0.063 0.0294 DEVELOPED 0.8200 0.0519 SUM 51.629 SUM 0.3752 0.6650 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.187593793 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00347 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55 =0.00347 0.19 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.3752 in/hr Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 in/hr Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. CORAL MOUNTAIN DLS 2553 RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE SF - LOW DENSITY LANDSCAPING AMC II AVERAGE ADJUSTED LOSS RATE Plate E-2.1 Page 3 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)1.44 RAINFALL VOLUME (cuft)269,876 SOIL LOSSES (cuft)70,315 EFFECTIVE RAIN (in)1.06 FLOOD VOLUME (acft)4.58 FLOOD VOLUME (cuft)199,561 PEAK FLOW RATE (cfs)290.83 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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)2.14 RAINFALL VOLUME (cuft)401,066 SOIL LOSSES (cuft)202,167 EFFECTIVE RAIN (in)1.06 FLOOD VOLUME (acft)4.57 FLOOD VOLUME (cuft)198,899 PEAK FLOW RATE (cfs)90.09 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3-HOUR STORM RCFC & WCD HYDROLOGY Plate E-2.2 3-Hour Storm Page 5 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM Plate E-2.2 6-Hour Storm Page 6 of 9 PROJECT: Job No.:2553 DATE BY:DLS 3/30/20 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 Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs CORALMOUNTAINRCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM 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)2.76 RAINFALL VOLUME (cuft)517,263 SOIL LOSSES (cuft)314,294 EFFECTIVE RAIN (in)1.08 FLOOD VOLUME (acft)4.66 FLOOD VOLUME (cuft)202,969 PEAK FLOW RATE (cfs)77.02 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 51.629 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3752 LAG TIME - MINUTES #DIV/0!MINIMUM LOSS RATE (for var. loss) - in/hr 0.188 UNIT TIME-PERCENT OF LAG #DIV/0!LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00347 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM Plate E-2.2 24 Hour Storm Page 8 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 3/30/20 DRAINAGE AREA-ACRES 51.629 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3752 LAG TIME - MINUTES #DIV/0!MINIMUM LOSS RATE (for var. loss) - in/hr 0.188 UNIT TIME-PERCENT OF LAG #DIV/0!LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00347 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow Plate E-5.9)Max Low in/hr cfs RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 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)4.41 RAINFALL VOLUME (cuft)826,496 SOIL LOSSES (cuft)647,343 EFFECTIVE RAIN (in)0.96 FLOOD VOLUME (acft)4.11 FLOOD VOLUME (cuft)179,153 PEAK FLOW (cfs)14.41 Plate E-2.2 24 Hour Storm Page 9 of 9 DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 5.754 D 56 0.51 1.00 9 B LANDSCAPING 5.950 D 56 0.51 0.10 3,950 ft 1,975 ft 462.3 ft ELEVATION OF CONCENTRATION POINT 442.0 ft 0.02 100 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in BASIN CHARACTERISTICS:ELEVATION 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 PERCOLATION RATE (in/hr)1.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention OFF-SITE NORTH RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 BASIN B AMC NUMBER Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)61,179 90,919 117,260 187,362 SOIL LOSSES (cu-ft)11,089 32,807 61,345 128,299 EFFECTIVE RAIN (in)1.18 1.37 1.32 1.39 FLOOD VOLUME (cu-ft)50,090 58,112 55,916 59,063 acre-ft)1.15 1.33 1.28 1.36 REQUIRED STORAGE (cu-ft)47,956 51,905 47,036 34,787 acre-ft)1.10 1.19 1.08 0.80 FACTOR OF SAFETY 2.65 2.44 2.70 3.65 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 21.77 18.81 4.43 MAXIMUM WSEL (ft)439.80 439.93 439.77 439.35 DEPTH (ft)1.80 1.93 1.77 1.35 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days)1.0 1.1 1.5 1.5 18] 200% OF LAG-MINUTES RAINFALL DATA 19.0 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. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 126,903 2.91 0.02 17] 100% OF LAG-MINUTES 9.5 9.5 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.16 16] LAG TIME-MINUTES 13] L*LCA/S^0.5 5.21 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.054 1975.00 12] S^0.5 0.374 27.1 462.3 442 20.3 3] AREA - ACRES 4] L-FEET 5] L-MILES 3950 0.748 BASIN B OFF-SITE NORTH CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 11.704 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 5.754 0.492 0.0251 DEVELOPED 0.1000 0.0492 B 56 0.51 10%0.46 5.950 0.508 0.2359 DEVELOPED 0.8200 0.4169 SUM 11.704 SUM 0.2610 0.4660 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.130504486 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00242 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00242 0.13 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.2610 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE LANDSCAPING AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 11.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 9.48 Maxwell Drywells UNIT TIME-PERCENT OF LAG 52.7 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.44 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.26 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.62 0.26 0.53 0.36 4.26 1,278 1,278 22,181 154 154 1,124 0.03 438.05 2 10 0.17 4.2 0.73 0.26 0.62 0.46 5.48 1,645 2,770 22,509 156 156 2,613 0.06 438.11 3 15 0.25 4.4 0.76 0.26 0.65 0.50 5.89 1,768 4,381 22,864 159 159 4,222 0.10 438.17 4 20 0.33 4.6 0.79 0.26 0.68 0.53 6.30 1,890 6,113 23,245 161 161 5,951 0.14 438.24 5 25 0.42 5.0 0.86 0.26 0.73 0.60 7.12 2,135 8,086 23,679 164 164 7,922 0.18 438.32 6 30 0.50 5.6 0.97 0.26 0.82 0.71 8.34 2,502 10,424 24,193 168 168 10,256 0.24 438.42 7 35 0.58 6.4 1.11 0.26 0.94 0.84 9.97 2,991 13,247 24,814 172 172 13,075 0.30 438.53 8 40 0.67 8.1 1.40 0.26 1.19 1.14 13.44 4,031 17,106 25,663 178 178 16,928 0.39 438.69 9 45 0.75 13.1 2.26 0.26 1.92 2.00 23.63 7,090 24,018 27,183 189 189 23,830 0.55 438.97 10 50 0.83 34.5 5.96 0.26 5.07 5.70 67.28 20,183 44,012 30,024 208 208 43,804 1.01 439.66 11 55 0.92 6.7 1.16 0.26 0.98 0.90 10.58 3,175 46,979 30,439 211 211 46,767 1.07 439.76 12 60 1.00 3.8 0.66 0.26 0.56 0.40 4.67 1,401 48,168 30,606 213 213 47,956 1.10 439.80 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 61,179 cu-ft SOIL LOSSES 11,089 cu-ft EFFECTIVE RAIN 1.18 in FLOOD VOLUME 1.15 acft FLOOD VOLUME 50,090 cu-ft REQUIRED STORAGE 1.10 REQUIRED STORAGE 47,956 cu-ft MAX WSEL 439.80 ft PEAK FLOW RATE 67.28 cfs TOTAL BASIN LOSSES 2,135 cu-ft AVERAGE PERCOLATION RATE 35.58 cf/min EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 11.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 9.48 Maxwell Drywells UNIT TIME-PERCENT OF LAG 52.7 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.26 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.33 0.26 0.28 0.07 0.86 258 258 21,957 152 152 105 0.00 438.00 2 10 0.17 1.3 0.33 0.26 0.28 0.07 0.86 258 363 21,980 153 153 211 0.00 438.01 3 15 0.25 1.1 0.28 0.26 0.24 0.02 0.25 76 287 21,963 153 153 134 0.00 438.01 4 20 0.33 1.5 0.39 0.26 0.33 0.12 1.47 440 574 22,026 153 153 421 0.01 438.02 5 25 0.42 1.5 0.39 0.26 0.33 0.12 1.47 440 861 22,089 153 153 707 0.02 438.03 6 30 0.50 1.8 0.46 0.26 0.39 0.20 2.37 712 1,420 22,212 154 154 1,265 0.03 438.05 7 35 0.58 1.5 0.39 0.26 0.33 0.12 1.47 440 1,705 22,275 155 155 1,550 0.04 438.06 8 40 0.67 1.8 0.46 0.26 0.39 0.20 2.37 712 2,263 22,398 156 156 2,107 0.05 438.09 9 45 0.75 1.8 0.46 0.26 0.39 0.20 2.37 712 2,820 22,520 156 156 2,663 0.06 438.11 10 50 0.83 1.5 0.39 0.26 0.33 0.12 1.47 440 3,103 22,583 157 157 2,946 0.07 438.12 11 55 0.92 1.6 0.41 0.26 0.35 0.15 1.77 531 3,477 22,665 157 157 3,319 0.08 438.14 12 60 1.00 1.8 0.46 0.26 0.39 0.20 2.37 712 4,032 22,787 158 158 3,874 0.09 438.16 13 65 1.08 2.2 0.56 0.26 0.48 0.30 3.59 1,076 4,950 22,989 160 160 4,790 0.11 438.20 14 70 1.17 2.2 0.56 0.26 0.48 0.30 3.59 1,076 5,866 23,190 161 161 5,705 0.13 438.23 15 75 1.25 2.2 0.56 0.26 0.48 0.30 3.59 1,076 6,781 23,392 162 162 6,619 0.15 438.27 16 80 1.33 2.0 0.51 0.26 0.44 0.25 2.98 894 7,513 23,553 164 164 7,350 0.17 438.30 17 85 1.42 2.6 0.67 0.26 0.57 0.41 4.80 1,440 8,789 23,833 166 166 8,624 0.20 438.35 18 90 1.50 2.7 0.69 0.26 0.59 0.43 5.10 1,531 10,155 24,134 168 168 9,987 0.23 438.41 19 95 1.58 2.4 0.62 0.26 0.52 0.36 4.19 1,258 11,245 24,373 169 169 11,076 0.25 438.45 20 100 1.67 2.7 0.69 0.26 0.59 0.43 5.10 1,531 12,606 24,673 171 171 12,435 0.29 438.51 21 105 1.75 3.3 0.85 0.26 0.72 0.59 6.92 2,076 14,511 25,092 174 174 14,337 0.33 438.58 22 110 1.83 3.1 0.80 0.26 0.68 0.54 6.31 1,894 16,232 25,470 177 177 16,055 0.37 438.65 23 115 1.92 2.9 0.74 0.26 0.63 0.48 5.71 1,713 17,767 25,808 179 179 17,588 0.40 438.72 24 120 2.00 3.0 0.77 0.26 0.65 0.51 6.01 1,803 19,391 26,165 182 182 19,210 0.44 438.78 25 125 2.08 3.1 0.80 0.26 0.68 0.54 6.31 1,894 21,104 26,542 184 184 20,920 0.48 438.85 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 11.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 9.48 Maxwell Drywells UNIT TIME-PERCENT OF LAG 52.7 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.26 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses 26 130 2.17 4.2 1.08 0.26 0.92 0.82 9.65 2,895 23,814 27,138 188 188 23,626 0.54 438.96 27 135 2.25 5.0 1.28 0.26 1.09 1.02 12.07 3,622 27,248 27,678 192 192 27,056 0.62 439.09 28 140 2.33 3.5 0.90 0.26 0.76 0.64 7.53 2,258 29,314 27,967 194 194 29,119 0.67 439.16 29 145 2.42 6.8 1.75 0.26 1.48 1.49 17.53 5,258 34,378 28,676 199 199 34,179 0.78 439.33 30 150 2.50 7.3 1.87 0.26 1.59 1.61 19.04 5,713 39,892 29,447 204 204 39,687 0.91 439.52 31 155 2.58 8.2 2.11 0.26 1.79 1.84 21.77 6,531 46,219 30,333 211 211 46,008 1.06 439.73 32 160 2.67 5.9 1.52 0.26 1.29 1.25 14.80 4,440 50,448 30,925 215 215 50,233 1.15 439.88 33 165 2.75 2.0 0.51 0.26 0.44 0.25 2.98 894 51,128 31,020 215 215 50,912 1.17 439.90 34 170 2.83 1.8 0.46 0.26 0.39 0.20 2.37 712 51,625 31,089 216 216 51,409 1.18 439.92 35 175 2.92 1.8 0.46 0.26 0.39 0.20 2.37 712 52,121 31,159 216 216 51,905 1.19 439.93 36 180 3.00 0.6 0.15 0.26 0.13 0.02 0.27 82 51,987 31,140 216 216 51,770 1.19 439.93 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 6,342 cu-ft 35.23 cf/min 1.37 in 1.33 acft 58,112 cu-ft 1.19 acft 51,905 cu-ft 32,807 cu-ft 2.14 in 90,919 cu-ft 439.93 ft 21.77 cfs Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 11.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 9.48 Maxwell Drywells UNIT TIME-PERCENT OF LAG 52.7 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.26 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.17 0.26 0.14 0.02 0.29 88 88 21,919 152 88 0 0.00 438.00 2 10 0.17 0.6 0.20 0.26 0.17 0.03 0.35 106 106 21,923 152 106 0 0.00 438.00 3 15 0.25 0.6 0.20 0.26 0.17 0.03 0.35 106 106 21,923 152 106 0 0.00 438.00 4 20 0.33 0.6 0.20 0.26 0.17 0.03 0.35 106 106 21,923 152 106 0 0.00 438.00 5 25 0.42 0.6 0.20 0.26 0.17 0.03 0.35 106 106 21,923 152 106 0 0.00 438.00 6 30 0.50 0.7 0.23 0.26 0.20 0.03 0.41 123 123 21,927 152 123 0 0.00 438.00 7 35 0.58 0.7 0.23 0.26 0.20 0.03 0.41 123 123 21,927 152 123 0 0.00 438.00 8 40 0.67 0.7 0.23 0.26 0.20 0.03 0.41 123 123 21,927 152 123 0 0.00 438.00 9 45 0.75 0.7 0.23 0.26 0.20 0.03 0.41 123 123 21,927 152 123 0 0.00 438.00 10 50 0.83 0.7 0.23 0.26 0.20 0.03 0.41 123 123 21,927 152 123 0 0.00 438.00 11 55 0.92 0.7 0.23 0.26 0.20 0.03 0.41 123 123 21,927 152 123 0 0.00 438.00 12 60 1.00 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 13 65 1.08 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 14 70 1.17 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 15 75 1.25 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 16 80 1.33 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 17 85 1.42 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 18 90 1.50 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 19 95 1.58 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 20 100 1.67 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 21 105 1.75 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 22 110 1.83 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 23 115 1.92 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 24 120 2.00 0.9 0.30 0.26 0.25 0.04 0.44 131 131 21,929 152 131 0 0.00 438.00 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 11.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 9.48 Maxwell Drywells UNIT TIME-PERCENT OF LAG 52.7 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.26 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.26 0.26 0.23 0.00 0.05 14 14 21,903 152 14 0 0.00 438.00 26 130 2.17 0.9 0.30 0.26 0.25 0.04 0.44 131 131 21,929 152 131 0 0.00 438.00 27 135 2.25 0.9 0.30 0.26 0.25 0.04 0.44 131 131 21,929 152 131 0 0.00 438.00 28 140 2.33 0.9 0.30 0.26 0.25 0.04 0.44 131 131 21,929 152 131 0 0.00 438.00 29 145 2.42 0.9 0.30 0.26 0.25 0.04 0.44 131 131 21,929 152 131 0 0.00 438.00 30 150 2.50 0.9 0.30 0.26 0.25 0.04 0.44 131 131 21,929 152 131 0 0.00 438.00 31 155 2.58 0.9 0.30 0.26 0.25 0.04 0.44 131 131 21,929 152 131 0 0.00 438.00 32 160 2.67 0.9 0.30 0.26 0.25 0.04 0.44 131 131 21,929 152 131 0 0.00 438.00 33 165 2.75 1.0 0.33 0.26 0.28 0.07 0.83 249 249 21,955 152 152 96 0.00 438.00 34 170 2.83 1.0 0.33 0.26 0.28 0.07 0.83 249 345 21,976 153 153 192 0.00 438.01 35 175 2.92 1.0 0.33 0.26 0.28 0.07 0.83 249 440 21,997 153 153 288 0.01 438.01 36 180 3.00 1.0 0.33 0.26 0.28 0.07 0.83 249 536 22,018 153 153 383 0.01 438.02 37 185 3.08 1.0 0.33 0.26 0.28 0.07 0.83 249 632 22,039 153 153 479 0.01 438.02 38 190 3.17 1.1 0.36 0.26 0.31 0.10 1.22 366 845 22,086 153 153 691 0.02 438.03 39 195 3.25 1.1 0.36 0.26 0.31 0.10 1.22 366 1,057 22,132 154 154 903 0.02 438.04 40 200 3.33 1.1 0.36 0.26 0.31 0.10 1.22 366 1,269 22,179 154 154 1,115 0.03 438.05 41 205 3.42 1.2 0.40 0.26 0.34 0.14 1.61 483 1,598 22,251 155 155 1,443 0.03 438.06 42 210 3.50 1.3 0.43 0.26 0.37 0.17 2.00 600 2,044 22,350 155 155 1,889 0.04 438.08 43 215 3.58 1.4 0.46 0.26 0.39 0.20 2.39 718 2,606 22,473 156 156 2,450 0.06 438.10 44 220 3.67 1.4 0.46 0.26 0.39 0.20 2.39 718 3,168 22,597 157 157 3,011 0.07 438.12 45 225 3.75 1.5 0.50 0.26 0.42 0.24 2.78 835 3,846 22,746 158 158 3,688 0.08 438.15 46 230 3.83 1.5 0.50 0.26 0.42 0.24 2.78 835 4,522 22,895 159 159 4,363 0.10 438.18 47 235 3.92 1.6 0.53 0.26 0.45 0.27 3.17 952 5,315 23,069 160 160 5,155 0.12 438.21 48 240 4.00 1.6 0.53 0.26 0.45 0.27 3.17 952 6,107 23,243 161 161 5,946 0.14 438.24 49 245 4.08 1.7 0.56 0.26 0.48 0.30 3.56 1,069 7,015 23,443 163 163 6,852 0.16 438.28 50 250 4.17 1.8 0.60 0.26 0.51 0.34 3.96 1,187 8,039 23,668 164 164 7,875 0.18 438.32 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 11.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 9.48 Maxwell Drywells UNIT TIME-PERCENT OF LAG 52.7 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.26 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.63 0.26 0.53 0.37 4.35 1,304 9,179 23,919 166 166 9,012 0.21 438.37 52 260 4.33 2.0 0.66 0.26 0.56 0.40 4.74 1,421 10,434 24,195 168 168 10,266 0.24 438.42 53 265 4.42 2.1 0.70 0.26 0.59 0.43 5.13 1,538 11,804 24,496 170 170 11,634 0.27 438.47 54 270 4.50 2.1 0.70 0.26 0.59 0.43 5.13 1,538 13,172 24,797 172 172 13,000 0.30 438.53 55 275 4.58 2.2 0.73 0.26 0.62 0.47 5.52 1,656 14,656 25,124 174 174 14,481 0.33 438.59 56 280 4.67 2.3 0.76 0.26 0.65 0.50 5.91 1,773 16,254 25,475 177 177 16,077 0.37 438.65 57 285 4.75 2.4 0.79 0.26 0.68 0.53 6.30 1,890 17,967 25,852 180 180 17,788 0.41 438.72 58 290 4.83 2.4 0.79 0.26 0.68 0.53 6.30 1,890 19,678 26,228 182 182 19,496 0.45 438.79 59 295 4.92 2.5 0.83 0.26 0.70 0.57 6.69 2,007 21,503 26,630 185 185 21,318 0.49 438.87 60 300 5.00 2.6 0.86 0.26 0.73 0.60 7.08 2,125 23,443 27,056 188 188 23,255 0.53 438.95 61 305 5.08 3.1 1.03 0.26 0.87 0.77 9.04 2,711 25,966 27,498 191 191 25,775 0.59 439.04 62 310 5.17 3.6 1.19 0.26 1.01 0.93 10.99 3,297 29,072 27,933 194 194 28,878 0.66 439.15 63 315 5.25 3.9 1.29 0.26 1.10 1.03 12.16 3,649 32,527 28,417 197 197 32,330 0.74 439.27 64 320 5.33 4.2 1.39 0.26 1.18 1.13 13.34 4,001 36,331 28,949 201 201 36,130 0.83 439.39 65 325 5.42 4.7 1.56 0.26 1.32 1.30 15.29 4,587 40,717 29,563 205 205 40,512 0.93 439.54 66 330 5.50 5.6 1.85 0.26 1.58 1.59 18.81 5,642 46,154 30,324 211 211 45,944 1.05 439.73 67 335 5.58 1.9 0.63 0.26 0.53 0.37 4.35 1,304 47,247 30,477 212 212 47,036 1.08 439.77 68 340 5.67 0.9 0.30 0.26 0.25 0.04 0.44 131 47,167 30,466 212 212 46,956 1.08 439.76 69 345 5.75 0.6 0.20 0.26 0.17 0.03 0.35 106 47,061 30,451 211 211 46,850 1.08 439.76 70 350 5.83 0.5 0.17 0.26 0.14 0.02 0.29 88 46,938 30,433 211 211 46,726 1.07 439.76 71 355 5.92 0.3 0.10 0.26 0.08 0.01 0.18 53 46,779 30,411 211 211 46,568 1.07 439.75 72 360 6.00 0.2 0.07 0.26 0.06 0.01 0.12 35 46,603 30,387 211 211 46,392 1.07 439.74 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 26.45 cf/min 9,524 cu-ft 1.32 in 1.28 acft 55,916 cu-ft 1.08 acft 47,036 cu-ft 117,260 cu-ft 2.76 in 61,345 cu-ft 439.77 ft 18.81 cfs Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 11.70 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 9.48 C 0.00242 Maxwell Drywells UNIT TIME-PERCENT OF LAG 158%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.035 0.461 0.030 0.01 0.06 56 56 21,912 457 56 0 0.00 438.00 2 30 0.50 0.3 0.053 0.456 0.045 0.01 0.09 84 84 21,919 457 84 0 0.00 438.00 3 45 0.75 0.3 0.053 0.450 0.045 0.01 0.09 84 84 21,919 457 84 0 0.00 438.00 4 60 1.00 0.4 0.071 0.445 0.060 0.01 0.12 112 112 21,925 457 112 0 0.00 438.00 5 75 1.25 0.3 0.053 0.440 0.045 0.01 0.09 84 84 21,919 457 84 0 0.00 438.00 6 90 1.50 0.3 0.053 0.434 0.045 0.01 0.09 84 84 21,919 457 84 0 0.00 438.00 7 105 1.75 0.3 0.053 0.429 0.045 0.01 0.09 84 84 21,919 457 84 0 0.00 438.00 8 120 2.00 0.4 0.071 0.424 0.060 0.01 0.12 112 112 21,925 457 112 0 0.00 438.00 9 135 2.25 0.4 0.071 0.419 0.060 0.01 0.12 112 112 21,925 457 112 0 0.00 438.00 10 150 2.50 0.4 0.071 0.414 0.060 0.01 0.12 112 112 21,925 457 112 0 0.00 438.00 11 165 2.75 0.5 0.088 0.409 0.075 0.01 0.16 141 141 21,931 457 141 0 0.00 438.00 12 180 3.00 0.5 0.088 0.404 0.075 0.01 0.16 141 141 21,931 457 141 0 0.00 438.00 13 195 3.25 0.5 0.088 0.399 0.075 0.01 0.16 141 141 21,931 457 141 0 0.00 438.00 14 210 3.50 0.5 0.088 0.394 0.075 0.01 0.16 141 141 21,931 457 141 0 0.00 438.00 15 225 3.75 0.5 0.088 0.389 0.075 0.01 0.16 141 141 21,931 457 141 0 0.00 438.00 16 240 4.00 0.6 0.106 0.384 0.090 0.02 0.19 169 169 21,937 457 169 0 0.00 438.00 17 255 4.25 0.6 0.106 0.379 0.090 0.02 0.19 169 169 21,937 457 169 0 0.00 438.00 18 270 4.50 0.7 0.123 0.374 0.105 0.02 0.22 197 197 21,943 457 197 0 0.00 438.00 19 285 4.75 0.7 0.123 0.370 0.105 0.02 0.22 197 197 21,943 457 197 0 0.00 438.00 20 300 5.00 0.8 0.141 0.365 0.120 0.02 0.25 225 225 21,949 457 225 0 0.00 438.00 21 315 5.25 0.6 0.106 0.360 0.090 0.02 0.19 169 169 21,937 457 169 0 0.00 438.00 22 330 5.50 0.7 0.123 0.355 0.105 0.02 0.22 197 197 21,943 457 197 0 0.00 438.00 23 345 5.75 0.8 0.141 0.351 0.120 0.02 0.25 225 225 21,949 457 225 0 0.00 438.00 24 360 6.00 0.8 0.141 0.346 0.120 0.02 0.25 225 225 21,949 457 225 0 0.00 438.00 25 375 6.25 0.9 0.159 0.341 0.135 0.02 0.28 253 253 21,956 457 253 0 0.00 438.00 26 390 6.50 0.9 0.159 0.337 0.135 0.02 0.28 253 253 21,956 457 253 0 0.00 438.00 27 405 6.75 1.0 0.176 0.332 0.150 0.03 0.31 281 281 21,962 458 281 0 0.00 438.00 28 420 7.00 1.0 0.176 0.328 0.150 0.03 0.31 281 281 21,962 458 281 0 0.00 438.00 29 435 7.25 1.0 0.176 0.323 0.150 0.03 0.31 281 281 21,962 458 281 0 0.00 438.00 30 450 7.50 1.1 0.194 0.319 0.165 0.03 0.34 309 309 21,968 458 309 0 0.00 438.00 31 465 7.75 1.2 0.212 0.315 0.180 0.03 0.37 337 337 21,974 458 337 0 0.00 438.00 32 480 8.00 1.3 0.229 0.310 0.195 0.03 0.41 365 365 21,980 458 365 0 0.00 438.00 33 495 8.25 1.5 0.265 0.306 0.225 0.04 0.47 422 422 21,993 458 422 0 0.00 438.00 34 510 8.50 1.5 0.265 0.302 0.225 0.04 0.47 422 422 21,993 458 422 0 0.00 438.00 35 525 8.75 1.6 0.282 0.298 0.240 0.04 0.50 450 450 21,999 458 450 0 0.00 438.00 36 540 9.00 1.7 0.300 0.293 0.255 0.01 0.08 69 69 21,915 457 69 0 0.00 438.00 37 555 9.25 1.9 0.335 0.289 0.285 0.05 0.54 488 488 22,007 458 458 30 0.00 438.00 38 570 9.50 2.0 0.353 0.285 0.300 0.07 0.80 719 749 22,065 460 460 289 0.01 438.01 39 585 9.75 2.1 0.370 0.281 0.315 0.09 1.06 950 1,239 22,173 462 462 777 0.02 438.03 40 600 10.00 2.2 0.388 0.277 0.330 0.11 1.31 1,180 1,958 22,331 465 465 1,492 0.03 438.06 41 615 10.25 1.5 0.265 0.273 0.225 0.04 0.47 422 1,914 22,321 465 465 1,449 0.03 438.06 42 630 10.50 1.5 0.265 0.269 0.225 0.04 0.47 422 1,871 22,311 465 465 1,406 0.03 438.06 43 645 10.75 2.0 0.353 0.265 0.300 0.09 1.04 932 2,337 22,414 467 467 1,870 0.04 438.08 in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 11.70 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 9.48 C 0.00242 Maxwell Drywells UNIT TIME-PERCENT OF LAG 158%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 44 660 11.00 2.0 0.353 0.261 0.300 0.09 1.08 973 2,843 22,525 469 469 2,374 0.05 438.10 45 675 11.25 1.9 0.335 0.257 0.285 0.08 0.92 826 3,200 22,604 471 471 2,729 0.06 438.11 46 690 11.50 1.9 0.335 0.254 0.285 0.08 0.96 867 3,596 22,691 473 473 3,123 0.07 438.13 47 705 11.75 1.7 0.300 0.250 0.255 0.05 0.59 532 3,655 22,704 473 473 3,182 0.07 438.13 48 720 12.00 1.8 0.318 0.246 0.270 0.07 0.84 759 3,941 22,767 474 474 3,466 0.08 438.14 49 735 12.25 2.5 0.441 0.242 0.375 0.20 2.34 2,109 5,575 23,126 482 482 5,094 0.12 438.21 50 750 12.50 2.6 0.459 0.239 0.390 0.22 2.59 2,335 7,429 23,534 490 490 6,938 0.16 438.28 51 765 12.75 2.8 0.494 0.235 0.420 0.26 3.05 2,748 9,686 24,031 501 501 9,186 0.21 438.37 52 780 13.00 2.9 0.512 0.232 0.435 0.28 3.30 2,973 12,159 24,574 512 512 11,647 0.27 438.47 53 795 13.25 3.4 0.600 0.228 0.510 0.37 4.39 3,947 15,593 25,330 528 528 15,066 0.35 438.61 54 810 13.50 3.4 0.600 0.225 0.510 0.38 4.43 3,984 19,049 26,090 544 544 18,506 0.42 438.75 55 825 13.75 2.3 0.406 0.221 0.345 0.18 2.18 1,959 20,465 26,401 550 550 19,915 0.46 438.81 56 840 14.00 2.3 0.406 0.218 0.345 0.19 2.22 1,995 21,909 26,719 557 557 21,353 0.49 438.87 57 855 14.25 2.7 0.476 0.215 0.405 0.26 3.09 2,779 24,132 27,208 567 567 23,565 0.54 438.96 58 870 14.50 2.6 0.459 0.211 0.390 0.25 2.92 2,627 26,192 27,530 574 574 25,619 0.59 439.04 59 885 14.75 2.6 0.459 0.208 0.390 0.25 2.96 2,661 28,280 27,822 580 580 27,700 0.64 439.11 60 900 15.00 2.5 0.441 0.205 0.375 0.24 2.79 2,508 30,208 28,092 585 585 29,623 0.68 439.17 61 915 15.25 2.4 0.423 0.202 0.360 0.22 2.62 2,354 31,976 28,339 590 590 31,386 0.72 439.23 62 930 15.50 2.3 0.406 0.199 0.345 0.21 2.44 2,199 33,585 28,565 595 595 32,990 0.76 439.29 63 945 15.75 1.9 0.335 0.196 0.285 0.14 1.65 1,482 34,472 28,689 598 598 33,874 0.78 439.32 64 960 16.00 1.9 0.335 0.193 0.285 0.14 1.68 1,514 35,388 28,817 600 600 34,787 0.80 439.35 65 975 16.25 0.4 0.071 0.190 0.060 0.01 0.12 112 34,900 28,749 599 599 34,301 0.79 439.33 66 990 16.50 0.4 0.071 0.187 0.060 0.01 0.12 112 34,413 28,680 598 598 33,816 0.78 439.32 67 1005 16.75 0.3 0.053 0.184 0.045 0.01 0.09 84 33,900 28,609 596 596 33,304 0.76 439.30 68 1020 17.00 0.3 0.053 0.181 0.045 0.01 0.09 84 33,388 28,537 595 595 32,794 0.75 439.28 69 1035 17.25 0.5 0.088 0.178 0.075 0.01 0.16 141 32,934 28,473 593 593 32,341 0.74 439.27 70 1050 17.50 0.5 0.088 0.176 0.075 0.01 0.16 141 32,482 28,410 592 592 31,890 0.73 439.25 71 1065 17.75 0.5 0.088 0.173 0.075 0.01 0.16 141 32,030 28,347 591 591 31,440 0.72 439.23 72 1080 18.00 0.4 0.071 0.171 0.060 0.01 0.12 112 31,552 28,280 589 589 30,963 0.71 439.22 73 1095 18.25 0.4 0.071 0.168 0.060 0.01 0.12 112 31,075 28,213 588 588 30,487 0.70 439.20 74 1110 18.50 0.4 0.071 0.166 0.060 0.01 0.12 112 30,600 28,147 586 586 30,014 0.69 439.19 75 1125 18.75 0.3 0.053 0.163 0.045 0.01 0.09 84 30,098 28,076 585 585 29,513 0.68 439.17 76 1140 19.00 0.2 0.035 0.161 0.030 0.01 0.06 56 29,569 28,002 583 583 28,986 0.67 439.15 77 1155 19.25 0.3 0.053 0.159 0.045 0.01 0.09 84 29,070 27,933 582 582 28,488 0.65 439.13 78 1170 19.50 0.4 0.071 0.156 0.060 0.01 0.12 112 28,601 27,867 581 581 28,020 0.64 439.12 79 1185 19.75 0.3 0.053 0.154 0.045 0.01 0.09 84 28,104 27,797 579 579 27,525 0.63 439.10 80 1200 20.00 0.2 0.035 0.152 0.030 0.01 0.06 56 27,581 27,724 578 578 27,004 0.62 439.08 81 1215 20.25 0.3 0.053 0.150 0.045 0.01 0.09 84 27,088 27,655 576 576 26,512 0.61 439.07 82 1230 20.50 0.3 0.053 0.148 0.045 0.01 0.09 84 26,596 27,586 575 575 26,022 0.60 439.05 83 1245 20.75 0.3 0.053 0.146 0.045 0.01 0.09 84 26,106 27,518 573 573 25,533 0.59 439.03 84 1260 21.00 0.2 0.035 0.145 0.030 0.01 0.06 56 25,589 27,445 572 572 25,017 0.57 439.02 85 1275 21.25 0.3 0.053 0.143 0.045 0.01 0.09 84 25,101 27,377 570 570 24,531 0.56 439.00 86 1290 21.50 0.2 0.035 0.141 0.030 0.01 0.06 56 24,587 27,305 569 569 24,018 0.55 438.98 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 11.70 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.13 LAG TIME - MINUTES 9.48 C 0.00242 Maxwell Drywells UNIT TIME-PERCENT OF LAG 158%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 87 1305 21.75 0.3 0.053 0.140 0.045 0.01 0.09 84 24,103 27,201 567 567 23,536 0.54 438.96 88 1320 22.00 0.2 0.035 0.138 0.030 0.01 0.06 56 23,592 27,089 564 564 23,028 0.53 438.94 89 1335 22.25 0.3 0.053 0.137 0.045 0.01 0.09 84 23,112 26,984 562 562 22,550 0.52 438.92 90 1350 22.50 0.2 0.035 0.136 0.030 0.01 0.06 56 22,606 26,872 560 560 22,046 0.51 438.90 91 1365 22.75 0.2 0.035 0.134 0.030 0.01 0.06 56 22,103 26,762 558 558 21,545 0.49 438.88 92 1380 23.00 0.2 0.035 0.133 0.030 0.01 0.06 56 21,601 26,651 555 555 21,046 0.48 438.86 93 1395 23.25 0.2 0.035 0.132 0.030 0.01 0.06 56 21,102 26,542 553 553 20,549 0.47 438.84 94 1410 23.50 0.2 0.035 0.132 0.030 0.01 0.06 56 20,605 26,432 551 551 20,055 0.46 438.82 95 1425 23.75 0.2 0.035 0.131 0.030 0.01 0.06 56 20,111 26,324 548 548 19,563 0.45 438.80 96 1440 24.00 0.2 0.035 0.131 0.030 0.01 0.06 56 19,619 26,215 546 546 19,073 0.44 438.78 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 39,990 cu-ft 27.77 cf/min 1.39 in 1.36 acft 59,063 cu-ft 0.80 acft 34,787 cu-ft 4.41 in 187,362 cu-ft 128,299 cu-ft 439.35 ft 4.43 cfs Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL BASIN B BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 DLS 2 AMC II AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 B PAVING/HARDSCAPE 4.014 D 56 0.51 1.00 9 B LANDSCAPING 1.687 D 56 0.51 0.10 4,250 ft 2,125 ft 490.9 ft ELEVATION OF CONCENTRATION POINT 440.7 ft 0.02 100 LOW LOSS RATE (Storm Events > 10 Years)85% POINT RAIN FROM NOAA ATLAS 14 1-HOUR 1.44 in 3-HOUR 2.14 in 6-HOUR 2.76 in 24-HOUR 4.41 in BASIN CHARACTERISTICS:ELEVATION 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 PERCOLATION RATE (in/hr)1.0 in/hr DRYWELL DATA NUMBER USED PERCOLATION RATE LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION LENGTH OF WATERCOURSE (L) AREA DESIGNATION ELEVATION OF HEADWATER AVERAGE MANNINGS 'N' VALUE STORM FREQUENCY (YEAR) LENGTH TO POINT OPPOSITE CENTROID (Lca) Low Loss Conditions: X=Existing; D=Developed; BS=Retention OFF-SITE SOUTH RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE March 30, 2020 CORAL MOUNTAIN PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 BASIN B AMC NUMBER Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:3/30/20 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 DURATION 1-HOUR 3-HOUR 6-HOUR 24-HOUR RAINFALL VOLUME (cu-ft)29,800 44,287 57,117 91,264 SOIL LOSSES (cu-ft)3,585 10,683 21,044 50,595 EFFECTIVE RAIN (in)1.27 1.62 1.74 1.97 FLOOD VOLUME (cu-ft)26,215 33,604 36,073 40,668 acre-ft)0.60 0.77 0.83 0.93 REQUIRED STORAGE (cu-ft)23,515 25,738 23,414 16,515 acre-ft)0.54 0.59 0.54 0.38 FACTOR OF SAFETY 9.25 8.46 9.29 13.18 STORAGE PROVIDED (cu-ft) acre-ft) PEAK FLOW (cfs)n/a 11.11 9.67 2.59 MAXIMUM WSEL (ft)436.69 436.76 436.69 436.49 DEPTH (ft)0.69 0.76 0.69 0.49 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days)0.4 0.5 0.7 1.0 18] 200% OF LAG-MINUTES RAINFALL DATA 17.1 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. LOWEST PAD ELEVATION LOWEST FLOWLINE ELEVATION STORM EVENT SUMMARY 217,630 5.00 0.02 17] 100% OF LAG-MINUTES 8.6 8.6 14] AVERAGE MANNINGS 'N' 15] LAG TIME-HOURS 0.14 16] LAG TIME-MINUTES 13] L*LCA/S^0.5 7.90 11] S-FEET/MILE 6] La-FEET 7] La-MILES 8] ELEVATION OF HEADWATER 0.041 2125.00 12] S^0.5 0.402 62.4 490.9 440.7 50.2 3] AREA - ACRES 4] L-FEET 5] L-MILES 4250 0.805 BASIN B OFF-SITE SOUTH CORAL MOUNTAIN 10] H-FEET 9] ELEVATION OF CONCENTRATION POINT 5.701 PHYSICAL DATA 1] CONCENTRATION POINT HYDROLOGY MANUAL BASIC DATA CALCULATION FORM 2553 DLS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD 2] AREA DESIGNATION Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:3/30/20 MAX LOW LOW MIN SOIL RI PERVIOUS DECIMAL ADJUSTED AREA AREA AVERAGE LOSS LOSS RATE AVERAGE GROUP NUMBER AREA PERCENT INFILTRATION WEIGHTED ADJUSTED CONDITION PER ADJUSTED INFILTRATION OF AREA RATE AVERAGE INFILTRATION RCFC/2322 INFILTRATION RATE IMPERVIOUS RATE RATE in/hr)(in/hr)(in/hr) Plate C-1][Plate E-6.1][Plate E-6.2][Plate E-6.3] B 56 0.51 100%0.05 4.014 0.704 0.0359 DEVELOPED 0.1000 0.0704 B 56 0.51 10%0.46 1.687 0.296 0.1373 DEVELOPED 0.8200 0.2426 SUM 5.701 SUM 0.1732 0.3131 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.08662083 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00160 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00160 0.09 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.1732 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8500 Basin Site: Low Loss = 10% Where:For 100 Year Storm - Low Loss should be between 80% & 90% T=Time in minutes. To get an average value for each unit time period, Use T=1/2 the unit time for the first time period,of the Rainfall Rate T=1 1/2 unit time for the second period, etc. 24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE LANDSCAPING AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM CORAL MOUNTAIN DLS 2553 AMC II Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 5.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 8.56 Maxwell Drywells UNIT TIME-PERCENT OF LAG 58.4 Number 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.44 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE-in/hr 0.17 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 3.6 0.62 0.17 0.53 0.45 2.58 774 774 30,504 212 212 562 0.01 436.02 2 10 0.17 4.2 0.73 0.17 0.62 0.55 3.18 953 1,515 30,667 213 213 1,302 0.03 436.04 3 15 0.25 4.4 0.76 0.17 0.65 0.59 3.37 1,012 2,315 30,842 214 214 2,100 0.05 436.06 4 20 0.33 4.6 0.79 0.17 0.68 0.62 3.57 1,072 3,172 31,029 215 215 2,957 0.07 436.09 5 25 0.42 5.0 0.86 0.17 0.73 0.69 3.97 1,191 4,148 31,243 217 217 3,931 0.09 436.12 6 30 0.50 5.6 0.97 0.17 0.82 0.79 4.57 1,370 5,301 31,495 219 219 5,083 0.12 436.15 7 35 0.58 6.4 1.11 0.17 0.94 0.93 5.36 1,608 6,691 31,800 221 221 6,470 0.15 436.19 8 40 0.67 8.1 1.40 0.17 1.19 1.23 7.05 2,115 8,585 32,214 224 224 8,362 0.19 436.25 9 45 0.75 13.1 2.26 0.17 1.92 2.09 12.02 3,605 11,967 32,955 229 229 11,738 0.27 436.35 10 50 0.83 34.5 5.96 0.17 5.07 5.79 33.27 9,982 21,720 35,090 244 244 21,476 0.49 436.63 11 55 0.92 6.7 1.16 0.17 0.98 0.98 5.66 1,698 23,174 35,408 246 246 22,928 0.53 436.67 12 60 1.00 3.8 0.66 0.17 0.56 0.48 2.78 834 23,762 35,537 247 247 23,515 0.54 436.69 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 29,800 cu-ft SOIL LOSSES 3,585 cu-ft EFFECTIVE RAIN 1.27 in FLOOD VOLUME 0.60 acft FLOOD VOLUME 26,215 cu-ft REQUIRED STORAGE 0.54 REQUIRED STORAGE 23,515 cu-ft MAX WSEL 436.69 ft PEAK FLOW RATE 33.27 cfs TOTAL BASIN LOSSES 2,700 cu-ft AVERAGE PERCOLATION RATE 45.00 cf/min EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses CORALMOUNTAINRCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1-HOUR STORM Plate E-2.2 1-Hour Storm Page 4 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 5.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 8.56 Maxwell Drywells UNIT TIME-PERCENT OF LAG 58.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.17 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 1.3 0.33 0.17 0.28 0.16 0.92 277 277 30,396 211 211 66 0.00 436.00 2 10 0.17 1.3 0.33 0.17 0.28 0.16 0.92 277 343 30,410 211 211 132 0.00 436.00 3 15 0.25 1.1 0.28 0.17 0.24 0.11 0.63 188 320 30,405 211 211 109 0.00 436.00 4 20 0.33 1.5 0.39 0.17 0.33 0.21 1.22 366 474 30,439 211 211 263 0.01 436.01 5 25 0.42 1.5 0.39 0.17 0.33 0.21 1.22 366 629 30,473 212 212 417 0.01 436.01 6 30 0.50 1.8 0.46 0.17 0.39 0.29 1.66 498 915 30,535 212 212 703 0.02 436.02 7 35 0.58 1.5 0.39 0.17 0.33 0.21 1.22 366 1,069 30,569 212 212 857 0.02 436.03 8 40 0.67 1.8 0.46 0.17 0.39 0.29 1.66 498 1,355 30,632 213 213 1,142 0.03 436.03 9 45 0.75 1.8 0.46 0.17 0.39 0.29 1.66 498 1,641 30,694 213 213 1,427 0.03 436.04 10 50 0.83 1.5 0.39 0.17 0.33 0.21 1.22 366 1,793 30,728 213 213 1,580 0.04 436.05 11 55 0.92 1.6 0.41 0.17 0.35 0.24 1.37 410 1,989 30,771 214 214 1,776 0.04 436.05 12 60 1.00 1.8 0.46 0.17 0.39 0.29 1.66 498 2,274 30,833 214 214 2,060 0.05 436.06 13 65 1.08 2.2 0.56 0.17 0.48 0.39 2.25 676 2,736 30,934 215 215 2,521 0.06 436.07 14 70 1.17 2.2 0.56 0.17 0.48 0.39 2.25 676 3,196 31,035 216 216 2,981 0.07 436.09 15 75 1.25 2.2 0.56 0.17 0.48 0.39 2.25 676 3,656 31,135 216 216 3,440 0.08 436.10 16 80 1.33 2.0 0.51 0.17 0.44 0.34 1.96 587 4,027 31,217 217 217 3,810 0.09 436.11 17 85 1.42 2.6 0.67 0.17 0.57 0.49 2.84 853 4,663 31,356 218 218 4,445 0.10 436.13 18 90 1.50 2.7 0.69 0.17 0.59 0.52 2.99 897 5,342 31,504 219 219 5,123 0.12 436.15 19 95 1.58 2.4 0.62 0.17 0.52 0.44 2.55 764 5,888 31,624 220 220 5,668 0.13 436.17 20 100 1.67 2.7 0.69 0.17 0.59 0.52 2.99 897 6,565 31,772 221 221 6,344 0.15 436.19 21 105 1.75 3.3 0.85 0.17 0.72 0.67 3.88 1,163 7,507 31,978 222 222 7,285 0.17 436.21 22 110 1.83 3.1 0.80 0.17 0.68 0.62 3.58 1,074 8,359 32,165 223 223 8,136 0.19 436.24 23 115 1.92 2.9 0.74 0.17 0.63 0.57 3.29 986 9,121 32,332 225 225 8,897 0.20 436.26 24 120 2.00 3.0 0.77 0.17 0.65 0.60 3.43 1,030 9,927 32,508 226 226 9,701 0.22 436.29 25 125 2.08 3.1 0.80 0.17 0.68 0.62 3.58 1,074 10,775 32,694 227 227 10,548 0.24 436.31 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 5.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 8.56 Maxwell Drywells UNIT TIME-PERCENT OF LAG 58.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.14 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.17 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate Basin Losses 26 130 2.17 4.2 1.08 0.17 0.92 0.91 5.20 1,561 12,109 32,986 229 229 11,880 0.27 436.35 27 135 2.25 5.0 1.28 0.17 1.09 1.11 6.39 1,916 13,796 33,355 232 232 13,564 0.31 436.40 28 140 2.33 3.5 0.90 0.17 0.76 0.73 4.17 1,251 14,815 33,578 233 233 14,582 0.33 436.43 29 145 2.42 6.8 1.75 0.17 1.48 1.57 9.04 2,713 17,295 34,121 237 237 17,058 0.39 436.50 30 150 2.50 7.3 1.87 0.17 1.59 1.70 9.78 2,934 19,992 34,711 241 241 19,751 0.45 436.58 31 155 2.58 8.2 2.11 0.17 1.79 1.93 11.11 3,333 23,084 35,388 246 246 22,838 0.52 436.67 32 160 2.67 5.9 1.52 0.17 1.29 1.34 7.71 2,314 25,152 35,841 249 249 24,903 0.57 436.73 33 165 2.75 2.0 0.51 0.17 0.44 0.34 1.96 587 25,490 35,915 249 249 25,241 0.58 436.74 34 170 2.83 1.8 0.46 0.17 0.39 0.29 1.66 498 25,739 35,969 250 250 25,489 0.59 436.75 35 175 2.92 1.8 0.46 0.17 0.39 0.29 1.66 498 25,988 36,024 250 250 25,738 0.59 436.76 36 180 3.00 0.6 0.15 0.17 0.13 0.02 0.13 40 25,777 35,978 250 250 25,528 0.59 436.75 TOTAL RAIN RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 8,076 cu-ft 44.87 cf/min 1.62 in 0.77 acft 33,604 cu-ft 0.59 acft 25,738 cu-ft 10,683 cu-ft 2.14 in 44,287 cu-ft 436.76 ft 11.11 cfs Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 5.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 8.56 Maxwell Drywells UNIT TIME-PERCENT OF LAG 58.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.17 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 5 0.08 0.5 0.17 0.17 0.14 0.02 0.14 43 43 30,344 211 43 0 0.00 436.00 2 10 0.17 0.6 0.20 0.17 0.17 0.03 0.15 44 44 30,345 211 44 0 0.00 436.00 3 15 0.25 0.6 0.20 0.17 0.17 0.03 0.15 44 44 30,345 211 44 0 0.00 436.00 4 20 0.33 0.6 0.20 0.17 0.17 0.03 0.15 44 44 30,345 211 44 0 0.00 436.00 5 25 0.42 0.6 0.20 0.17 0.17 0.03 0.15 44 44 30,345 211 44 0 0.00 436.00 6 30 0.50 0.7 0.23 0.17 0.20 0.06 0.34 101 101 30,357 211 101 0 0.00 436.00 7 35 0.58 0.7 0.23 0.17 0.20 0.06 0.34 101 101 30,357 211 101 0 0.00 436.00 8 40 0.67 0.7 0.23 0.17 0.20 0.06 0.34 101 101 30,357 211 101 0 0.00 436.00 9 45 0.75 0.7 0.23 0.17 0.20 0.06 0.34 101 101 30,357 211 101 0 0.00 436.00 10 50 0.83 0.7 0.23 0.17 0.20 0.06 0.34 101 101 30,357 211 101 0 0.00 436.00 11 55 0.92 0.7 0.23 0.17 0.20 0.06 0.34 101 101 30,357 211 101 0 0.00 436.00 12 60 1.00 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 13 65 1.08 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 14 70 1.17 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 15 75 1.25 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 16 80 1.33 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 17 85 1.42 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 18 90 1.50 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 19 95 1.58 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 20 100 1.67 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 21 105 1.75 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 22 110 1.83 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 23 115 1.92 0.8 0.26 0.17 0.23 0.09 0.53 158 158 30,370 211 158 0 0.00 436.00 24 120 2.00 0.9 0.30 0.17 0.25 0.12 0.72 215 215 30,382 211 211 4 0.00 436.00 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses Plate E-2.2 6-Hour Storm Page 7 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 5.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 8.56 Maxwell Drywells UNIT TIME-PERCENT OF LAG 58.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.17 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 25 125 2.08 0.8 0.26 0.17 0.23 0.09 0.53 158 162 30,371 211 162 0 0.00 436.00 26 130 2.17 0.9 0.30 0.17 0.25 0.12 0.72 215 215 30,382 211 211 4 0.00 436.00 27 135 2.25 0.9 0.30 0.17 0.25 0.12 0.72 215 220 30,383 211 211 9 0.00 436.00 28 140 2.33 0.9 0.30 0.17 0.25 0.12 0.72 215 224 30,384 211 211 13 0.00 436.00 29 145 2.42 0.9 0.30 0.17 0.25 0.12 0.72 215 228 30,385 211 211 17 0.00 436.00 30 150 2.50 0.9 0.30 0.17 0.25 0.12 0.72 215 232 30,386 211 211 21 0.00 436.00 31 155 2.58 0.9 0.30 0.17 0.25 0.12 0.72 215 237 30,387 211 211 26 0.00 436.00 32 160 2.67 0.9 0.30 0.17 0.25 0.12 0.72 215 241 30,388 211 211 30 0.00 436.00 33 165 2.75 1.0 0.33 0.17 0.28 0.16 0.91 272 302 30,401 211 211 91 0.00 436.00 34 170 2.83 1.0 0.33 0.17 0.28 0.16 0.91 272 364 30,415 211 211 152 0.00 436.00 35 175 2.92 1.0 0.33 0.17 0.28 0.16 0.91 272 425 30,428 211 211 214 0.00 436.01 36 180 3.00 1.0 0.33 0.17 0.28 0.16 0.91 272 486 30,441 211 211 275 0.01 436.01 37 185 3.08 1.0 0.33 0.17 0.28 0.16 0.91 272 547 30,455 211 211 336 0.01 436.01 38 190 3.17 1.1 0.36 0.17 0.31 0.19 1.10 330 665 30,481 212 212 453 0.01 436.01 39 195 3.25 1.1 0.36 0.17 0.31 0.19 1.10 330 783 30,506 212 212 571 0.01 436.02 40 200 3.33 1.1 0.36 0.17 0.31 0.19 1.10 330 901 30,532 212 212 689 0.02 436.02 41 205 3.42 1.2 0.40 0.17 0.34 0.22 1.29 387 1,075 30,570 212 212 863 0.02 436.03 42 210 3.50 1.3 0.43 0.17 0.37 0.26 1.48 444 1,307 30,621 213 213 1,094 0.03 436.03 43 215 3.58 1.4 0.46 0.17 0.39 0.29 1.67 501 1,595 30,684 213 213 1,382 0.03 436.04 44 220 3.67 1.4 0.46 0.17 0.39 0.29 1.67 501 1,883 30,747 214 214 1,669 0.04 436.05 45 225 3.75 1.5 0.50 0.17 0.42 0.32 1.86 558 2,227 30,823 214 214 2,013 0.05 436.06 46 230 3.83 1.5 0.50 0.17 0.42 0.32 1.86 558 2,571 30,898 215 215 2,357 0.05 436.07 47 235 3.92 1.6 0.53 0.17 0.45 0.36 2.05 615 2,972 30,986 215 215 2,756 0.06 436.08 48 240 4.00 1.6 0.53 0.17 0.45 0.36 2.05 615 3,372 31,073 216 216 3,156 0.07 436.09 49 245 4.08 1.7 0.56 0.17 0.48 0.39 2.24 672 3,828 31,173 216 216 3,612 0.08 436.11 50 250 4.17 1.8 0.60 0.17 0.51 0.42 2.43 729 4,341 31,285 217 217 4,124 0.09 436.12 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 5.70 Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 8.56 Maxwell Drywells UNIT TIME-PERCENT OF LAG 58.4 Number 0 TOTAL ADJUSTED STORM RAIN (in)2.76 Drywell Percolation Rate 0.00 cfs 0.00 cfm CONSTANT LOSS RATE (in/hr)0.17 LOW LOSS RATE - PERCENT 85.00% Unit Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD Total In Basin in/hr MANUAL 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Basin Losses 51 255 4.25 1.9 0.63 0.17 0.53 0.46 2.62 786 4,910 31,410 218 218 4,692 0.11 436.14 52 260 4.33 2.0 0.66 0.17 0.56 0.49 2.81 844 5,536 31,547 219 219 5,316 0.12 436.16 53 265 4.42 2.1 0.70 0.17 0.59 0.52 3.00 901 6,217 31,696 220 220 5,997 0.14 436.18 54 270 4.50 2.1 0.70 0.17 0.59 0.52 3.00 901 6,898 31,845 221 221 6,677 0.15 436.20 55 275 4.58 2.2 0.73 0.17 0.62 0.56 3.19 958 7,634 32,006 222 222 7,412 0.17 436.22 56 280 4.67 2.3 0.76 0.17 0.65 0.59 3.38 1,015 8,427 32,180 223 223 8,204 0.19 436.24 57 285 4.75 2.4 0.79 0.17 0.68 0.62 3.57 1,072 9,276 32,366 225 225 9,051 0.21 436.27 58 290 4.83 2.4 0.79 0.17 0.68 0.62 3.57 1,072 10,123 32,551 226 226 9,897 0.23 436.29 59 295 4.92 2.5 0.83 0.17 0.70 0.65 3.76 1,129 11,026 32,749 227 227 10,799 0.25 436.32 60 300 5.00 2.6 0.86 0.17 0.73 0.69 3.95 1,186 11,985 32,959 229 229 11,756 0.27 436.35 61 305 5.08 3.1 1.03 0.17 0.87 0.85 4.91 1,472 13,228 33,231 231 231 12,997 0.30 436.38 62 310 5.17 3.6 1.19 0.17 1.01 1.02 5.86 1,757 14,755 33,565 233 233 14,522 0.33 436.43 63 315 5.25 3.9 1.29 0.17 1.10 1.12 6.43 1,929 16,450 33,936 236 236 16,215 0.37 436.48 64 320 5.33 4.2 1.39 0.17 1.18 1.22 7.00 2,100 18,315 34,344 239 239 18,076 0.41 436.53 65 325 5.42 4.7 1.56 0.17 1.32 1.38 7.95 2,386 20,462 34,814 242 242 20,220 0.46 436.59 66 330 5.50 5.6 1.85 0.17 1.58 1.68 9.67 2,900 23,120 35,396 246 246 22,874 0.53 436.67 67 335 5.58 1.9 0.63 0.17 0.53 0.46 2.62 786 23,661 35,515 247 247 23,414 0.54 436.69 68 340 5.67 0.9 0.30 0.17 0.25 0.12 0.72 215 23,629 35,508 247 247 23,383 0.54 436.69 69 345 5.75 0.6 0.20 0.17 0.17 0.03 0.15 44 23,427 35,463 246 246 23,181 0.53 436.68 70 350 5.83 0.5 0.17 0.17 0.14 0.02 0.14 43 23,223 35,419 246 246 22,977 0.53 436.68 71 355 5.92 0.3 0.10 0.17 0.08 0.01 0.09 26 23,003 35,371 246 246 22,758 0.52 436.67 72 360 6.00 0.2 0.07 0.17 0.06 0.01 0.06 17 22,775 35,321 245 245 22,529 0.52 436.66 TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 37.62 cf/min 13,544 cu-ft 1.74 in 0.83 acft 36,073 cu-ft 0.54 acft 23,414 cu-ft 57,117 cu-ft 2.76 in 21,044 cu-ft 436.69 ft 9.67 cfs Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 5.70 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.09 LAG TIME - MINUTES 8.56 C 0.00160 Maxwell Drywells UNIT TIME-PERCENT OF LAG 175%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft 1 15 0.25 0.2 0.035 0.306 0.030 0.01 0.03 27 27 30,341 632 27 0 0.00 436.00 2 30 0.50 0.3 0.053 0.302 0.045 0.01 0.05 41 41 30,344 632 41 0 0.00 436.00 3 45 0.75 0.3 0.053 0.299 0.045 0.01 0.05 41 41 30,344 632 41 0 0.00 436.00 4 60 1.00 0.4 0.071 0.295 0.060 0.01 0.06 55 55 30,347 632 55 0 0.00 436.00 5 75 1.25 0.3 0.053 0.292 0.045 0.01 0.05 41 41 30,344 632 41 0 0.00 436.00 6 90 1.50 0.3 0.053 0.288 0.045 0.01 0.05 41 41 30,344 632 41 0 0.00 436.00 7 105 1.75 0.3 0.053 0.285 0.045 0.01 0.05 41 41 30,344 632 41 0 0.00 436.00 8 120 2.00 0.4 0.071 0.282 0.060 0.01 0.06 55 55 30,347 632 55 0 0.00 436.00 9 135 2.25 0.4 0.071 0.278 0.060 0.01 0.06 55 55 30,347 632 55 0 0.00 436.00 10 150 2.50 0.4 0.071 0.275 0.060 0.01 0.06 55 55 30,347 632 55 0 0.00 436.00 11 165 2.75 0.5 0.088 0.271 0.075 0.01 0.08 68 68 30,350 632 68 0 0.00 436.00 12 180 3.00 0.5 0.088 0.268 0.075 0.01 0.08 68 68 30,350 632 68 0 0.00 436.00 13 195 3.25 0.5 0.088 0.265 0.075 0.01 0.08 68 68 30,350 632 68 0 0.00 436.00 14 210 3.50 0.5 0.088 0.261 0.075 0.01 0.08 68 68 30,350 632 68 0 0.00 436.00 15 225 3.75 0.5 0.088 0.258 0.075 0.01 0.08 68 68 30,350 632 68 0 0.00 436.00 16 240 4.00 0.6 0.106 0.255 0.090 0.02 0.09 82 82 30,353 632 82 0 0.00 436.00 17 255 4.25 0.6 0.106 0.252 0.090 0.02 0.09 82 82 30,353 632 82 0 0.00 436.00 18 270 4.50 0.7 0.123 0.248 0.105 0.02 0.11 96 96 30,356 632 96 0 0.00 436.00 19 285 4.75 0.7 0.123 0.245 0.105 0.02 0.11 96 96 30,356 632 96 0 0.00 436.00 20 300 5.00 0.8 0.141 0.242 0.120 0.02 0.12 110 110 30,359 632 110 0 0.00 436.00 21 315 5.25 0.6 0.106 0.239 0.090 0.02 0.09 82 82 30,353 632 82 0 0.00 436.00 22 330 5.50 0.7 0.123 0.236 0.105 0.02 0.11 96 96 30,356 632 96 0 0.00 436.00 23 345 5.75 0.8 0.141 0.233 0.120 0.02 0.12 110 110 30,359 632 110 0 0.00 436.00 24 360 6.00 0.8 0.141 0.230 0.120 0.02 0.12 110 110 30,359 632 110 0 0.00 436.00 25 375 6.25 0.9 0.159 0.227 0.135 0.02 0.14 123 123 30,362 633 123 0 0.00 436.00 26 390 6.50 0.9 0.159 0.224 0.135 0.02 0.14 123 123 30,362 633 123 0 0.00 436.00 27 405 6.75 1.0 0.176 0.221 0.150 0.03 0.15 137 137 30,365 633 137 0 0.00 436.00 28 420 7.00 1.0 0.176 0.218 0.150 0.03 0.15 137 137 30,365 633 137 0 0.00 436.00 29 435 7.25 1.0 0.176 0.215 0.150 0.03 0.15 137 137 30,365 633 137 0 0.00 436.00 30 450 7.50 1.1 0.194 0.212 0.165 0.03 0.17 151 151 30,368 633 151 0 0.00 436.00 31 465 7.75 1.2 0.212 0.209 0.180 0.00 0.02 15 15 30,338 632 15 0 0.00 436.00 32 480 8.00 1.3 0.229 0.206 0.195 0.02 0.13 121 121 30,361 633 121 0 0.00 436.00 33 495 8.25 1.5 0.265 0.203 0.225 0.06 0.35 318 318 30,405 633 318 0 0.00 436.00 34 510 8.50 1.5 0.265 0.200 0.225 0.06 0.37 333 333 30,408 633 333 0 0.00 436.00 35 525 8.75 1.6 0.282 0.197 0.240 0.08 0.49 438 438 30,431 634 438 0 0.00 436.00 36 540 9.00 1.7 0.300 0.195 0.255 0.11 0.60 544 544 30,454 634 544 0 0.00 436.00 37 555 9.25 1.9 0.335 0.192 0.285 0.14 0.82 741 741 30,497 635 635 106 0.00 436.00 38 570 9.50 2.0 0.353 0.189 0.300 0.16 0.94 846 952 30,543 636 636 316 0.01 436.01 39 585 9.75 2.1 0.370 0.187 0.315 0.18 1.06 952 1,267 30,612 638 638 629 0.01 436.02 40 600 10.00 2.2 0.388 0.184 0.330 0.20 1.17 1,057 1,686 30,704 640 640 1,046 0.02 436.03 41 615 10.25 1.5 0.265 0.181 0.225 0.08 0.48 432 1,478 30,659 639 639 839 0.02 436.02 42 630 10.50 1.5 0.265 0.179 0.225 0.09 0.49 445 1,285 30,616 638 638 647 0.01 436.02 43 645 10.75 2.0 0.353 0.176 0.300 0.18 1.02 915 1,562 30,677 639 639 923 0.02 436.03 in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses Plate E-2.2 24-Hour Storm Page 10 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 5.70 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.09 LAG TIME - MINUTES 8.56 C 0.00160 Maxwell Drywells UNIT TIME-PERCENT OF LAG 175%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 44 660 11.00 2.0 0.353 0.173 0.300 0.18 1.03 928 1,851 30,740 640 640 1,210 0.03 436.04 45 675 11.25 1.9 0.335 0.171 0.285 0.16 0.94 850 2,061 30,786 641 641 1,419 0.03 436.04 46 690 11.50 1.9 0.335 0.168 0.285 0.17 0.96 863 2,283 30,835 642 642 1,640 0.04 436.05 47 705 11.75 1.7 0.300 0.166 0.255 0.13 0.77 694 2,334 30,846 643 643 1,691 0.04 436.05 48 720 12.00 1.8 0.318 0.163 0.270 0.15 0.89 798 2,489 30,880 643 643 1,845 0.04 436.05 49 735 12.25 2.5 0.441 0.161 0.375 0.28 1.61 1,449 3,295 31,056 647 647 2,648 0.06 436.08 50 750 12.50 2.6 0.459 0.158 0.390 0.30 1.73 1,553 4,200 31,255 651 651 3,549 0.08 436.10 51 765 12.75 2.8 0.494 0.156 0.420 0.34 1.94 1,748 5,297 31,495 656 656 4,641 0.11 436.14 52 780 13.00 2.9 0.512 0.154 0.435 0.36 2.06 1,851 6,492 31,756 662 662 5,830 0.13 436.17 53 795 13.25 3.4 0.600 0.151 0.510 0.45 2.58 2,319 8,150 32,119 669 669 7,481 0.17 436.22 54 810 13.50 3.4 0.600 0.149 0.510 0.45 2.59 2,331 9,812 32,483 677 677 9,135 0.21 436.27 55 825 13.75 2.3 0.406 0.147 0.345 0.26 1.49 1,339 10,475 32,628 680 680 9,795 0.22 436.29 56 840 14.00 2.3 0.406 0.145 0.345 0.26 1.50 1,351 11,145 32,775 683 683 10,463 0.24 436.31 57 855 14.25 2.7 0.476 0.142 0.405 0.33 1.92 1,727 12,190 33,003 688 688 11,502 0.26 436.34 58 870 14.50 2.6 0.459 0.140 0.390 0.32 1.83 1,647 13,149 33,214 692 692 12,458 0.29 436.37 59 885 14.75 2.6 0.459 0.138 0.390 0.32 1.84 1,658 14,116 33,425 696 696 13,419 0.31 436.39 60 900 15.00 2.5 0.441 0.136 0.375 0.30 1.75 1,578 14,997 33,618 700 700 14,297 0.33 436.42 61 915 15.25 2.4 0.423 0.134 0.360 0.29 1.66 1,497 15,794 33,793 704 704 15,090 0.35 436.44 62 930 15.50 2.3 0.406 0.132 0.345 0.27 1.57 1,417 16,507 33,949 707 707 15,800 0.36 436.46 63 945 15.75 1.9 0.335 0.130 0.285 0.21 1.18 1,062 16,862 34,026 709 709 16,153 0.37 436.48 64 960 16.00 1.9 0.335 0.128 0.285 0.21 1.19 1,072 17,226 34,106 711 711 16,515 0.38 436.49 65 975 16.25 0.4 0.071 0.126 0.060 0.01 0.06 55 16,570 33,962 708 708 15,862 0.36 436.47 66 990 16.50 0.4 0.071 0.124 0.060 0.01 0.06 55 15,917 33,819 705 705 15,213 0.35 436.45 67 1005 16.75 0.3 0.053 0.122 0.045 0.01 0.05 41 15,254 33,674 702 702 14,552 0.33 436.43 68 1020 17.00 0.3 0.053 0.120 0.045 0.01 0.05 41 14,593 33,530 699 699 13,895 0.32 436.41 69 1035 17.25 0.5 0.088 0.118 0.075 0.01 0.08 68 13,963 33,392 696 696 13,267 0.30 436.39 70 1050 17.50 0.5 0.088 0.117 0.075 0.01 0.08 68 13,336 33,254 693 693 12,643 0.29 436.37 71 1065 17.75 0.5 0.088 0.115 0.075 0.01 0.08 68 12,712 33,118 690 690 12,022 0.28 436.35 72 1080 18.00 0.4 0.071 0.113 0.060 0.01 0.06 55 12,076 32,979 687 687 11,389 0.26 436.34 73 1095 18.25 0.4 0.071 0.112 0.060 0.01 0.06 55 11,444 32,840 684 684 10,760 0.25 436.32 74 1110 18.50 0.4 0.071 0.110 0.060 0.01 0.06 55 10,815 32,702 681 681 10,133 0.23 436.30 75 1125 18.75 0.3 0.053 0.108 0.045 0.01 0.05 41 10,174 32,562 678 678 9,496 0.22 436.28 76 1140 19.00 0.2 0.035 0.107 0.030 0.01 0.03 27 9,523 32,420 675 675 8,848 0.20 436.26 77 1155 19.25 0.3 0.053 0.105 0.045 0.01 0.05 41 8,889 32,281 673 673 8,217 0.19 436.24 78 1170 19.50 0.4 0.071 0.104 0.060 0.01 0.06 55 8,271 32,146 670 670 7,602 0.17 436.22 79 1185 19.75 0.3 0.053 0.102 0.045 0.01 0.05 41 7,643 32,008 667 667 6,976 0.16 436.21 80 1200 20.00 0.2 0.035 0.101 0.030 0.01 0.03 27 7,003 31,868 664 664 6,339 0.15 436.19 81 1215 20.25 0.3 0.053 0.100 0.045 0.01 0.05 41 6,380 31,732 661 661 5,719 0.13 436.17 82 1230 20.50 0.3 0.053 0.098 0.045 0.01 0.05 41 5,760 31,596 658 658 5,102 0.12 436.15 83 1245 20.75 0.3 0.053 0.097 0.045 0.01 0.05 41 5,143 31,461 655 655 4,488 0.10 436.13 84 1260 21.00 0.2 0.035 0.096 0.030 0.01 0.03 27 4,515 31,323 653 653 3,863 0.09 436.11 85 1275 21.25 0.3 0.053 0.095 0.045 0.01 0.05 41 3,904 31,190 650 650 3,254 0.07 436.10 86 1290 21.50 0.2 0.035 0.094 0.030 0.01 0.03 27 3,281 31,053 647 647 2,634 0.06 436.08 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 3/30/20 DRAINAGE AREA-ACRES 5.70 VARIABLE LOSS RATE (AVG) IN/HR Basin Percolation Rate 1.0 in/hr UNIT TIME-MINUTES 15 Fm = Minimum value on loss curve (in/hr)0.09 LAG TIME - MINUTES 8.56 C 0.00160 Maxwell Drywells UNIT TIME-PERCENT OF LAG 175%Low Loss Rate (percent)85.00%Number 0 TOTAL ADJUSTED STORM RAIN (in)4.41 Drywell Percolation Rate 0.00 cfs 0.00 cfm Unit Time Time Pattern Storm Effective Flood Volume Basin Basin Period Minutes Hours Percent Rain Rain Hydrograph In Volume Percolation Maximum Percolation WSEL in/hr Flow Area Percolation Out Plate E-5.9)Max Low in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate CORAL MOUNTAIN HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 87 1305 21.75 0.3 0.053 0.093 0.045 0.01 0.05 41 2,675 30,921 644 644 2,031 0.05 436.06 88 1320 22.00 0.2 0.035 0.092 0.030 0.01 0.03 27 2,059 30,786 641 641 1,417 0.03 436.04 89 1335 22.25 0.3 0.053 0.091 0.045 0.01 0.05 41 1,458 30,654 639 639 820 0.02 436.02 90 1350 22.50 0.2 0.035 0.090 0.030 0.01 0.03 27 847 30,520 636 636 211 0.00 436.01 91 1365 22.75 0.2 0.035 0.089 0.030 0.01 0.03 27 239 30,387 633 239 0 0.00 436.00 92 1380 23.00 0.2 0.035 0.089 0.030 0.01 0.03 27 27 30,341 632 27 0 0.00 436.00 93 1395 23.25 0.2 0.035 0.088 0.030 0.01 0.03 27 27 30,341 632 27 0 0.00 436.00 94 1410 23.50 0.2 0.035 0.087 0.030 0.01 0.03 27 27 30,341 632 27 0 0.00 436.00 95 1425 23.75 0.2 0.035 0.087 0.030 0.01 0.03 27 27 30,341 632 27 0 0.00 436.00 96 1440 24.00 0.2 0.035 0.087 0.030 0.01 0.03 27 27 30,341 632 27 0 0.00 436.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL RAINFALL VOLUME SOIL LOSSES EFFECTIVE RAIN FLOOD VOLUME FLOOD VOLUME REQUIRED STORAGE REQUIRED STORAGE MAX WSEL PEAK FLOW RATE TOTAL BASIN LOSSES AVERAGE PERCOLATION RATE 40,668 cu-ft 28.24 cf/min 1.97 in 0.93 acft 40,668 cu-ft 0.38 acft 16,515 cu-ft 4.41 in 91,264 cu-ft 50,595 cu-ft 436.49 ft 2.59 cfs Plate E-2.2 24-Hour Storm Page 12 of 13 PROECT JOB No. BASIN DESIGNATION: BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR ft)(ft)(sf)(sf)(cuft)(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: TOTAL BASIN B BASIN VOLUME WORKSHEET DEPTH AREA VOLUME CORAL MOUNTAIN 2553 2121213 1AAAAEEV++= Basin Volume Worksheet Page 13 of 13 Coral Mountain Preliminary Hydrology Report Appendix G Riverside County Whitewater River Region WQMP Worksheets ATRIB = 162.745 acres Determine the Impervious Area Within ATRIB (AIMP)AIMP = 39.291 acres Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB IF = 0.24 Use the following equation based on the WEF/ASCE Method CBMP = 0.858If 3 - 0.78If 2 + 0.774If + 0.04 CBMP = 0.19 Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.08 (in*ac)/ac Calculate the design storage volume of the BMP, VBMP VBMP (ft3) =VBMP = 45,719 ft3 QBMP = CBMP x I x ATRIB QBMP = 6.30 ft3/s I = Design Rainfall Intensity, 0.2 in/hr Notes: BMP Design Flow Rate, QBMP Company Name Designed By Company Project Number/Name Drainage Area Number/Name CORAL MOUNTAIN - MSA JOB #2553 DRAINAGE AREA 'A' March 30, 2020 VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) 12(in/ft) Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Determine Design Storage Volume, VBMP Legend: Required Entries Calculated Cells Determine the Impervious Area Ratio Whitewater Watershed BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014) Enter the Area Tributary to this Feature (ATRIB) MSA Consulting, Inc DLS Date County/City Case No. ATRIB = 41.586 acres Determine the Impervious Area Within ATRIB (AIMP)AIMP = 17.518 acres Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB IF = 0.42 Use the following equation based on the WEF/ASCE Method CBMP = 0.858If 3 - 0.78If 2 + 0.774If + 0.04 CBMP = 0.29 Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.12 (in*ac)/ac Calculate the design storage volume of the BMP, VBMP VBMP (ft3) =VBMP = 17,618 ft3 QBMP = CBMP x I x ATRIB QBMP = 2.43 ft3/s I = Design Rainfall Intensity, 0.2 in/hr Legend: Required Entries Calculated Cells Determine the Impervious Area Ratio Whitewater Watershed BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014) Enter the Area Tributary to this Feature (ATRIB) MSA Consulting, Inc DLS Date County/City Case No. Notes: BMP Design Flow Rate, QBMP Company Name Designed By Company Project Number/Name Drainage Area Number/Name CORAL MOUNTAIN - MSA JOB #2553 DRAINAGE AREA 'B' March 30, 2020 VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) 12(in/ft) Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Determine Design Storage Volume, VBMP ATRIB = 10.191 acres Determine the Impervious Area Within ATRIB (AIMP)AIMP = 4.420 acres Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB IF = 0.43 Use the following equation based on the WEF/ASCE Method CBMP = 0.858If 3 - 0.78If 2 + 0.774If + 0.04 CBMP = 0.30 Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.12 (in*ac)/ac Calculate the design storage volume of the BMP, VBMP VBMP (ft3) =VBMP = 4,424 ft3 QBMP = CBMP x I x ATRIB QBMP = 0.61 ft3/s I = Design Rainfall Intensity, 0.2 in/hr Notes: BMP Design Flow Rate, QBMP Company Name Designed By Company Project Number/Name Drainage Area Number/Name CORAL MOUNTAIN - MSA JOB #2553 DRAINAGE AREA 'C' March 30, 2020 VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) 12(in/ft) Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Determine Design Storage Volume, VBMP Legend: Required Entries Calculated Cells Determine the Impervious Area Ratio Whitewater Watershed BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014) Enter the Area Tributary to this Feature (ATRIB) MSA Consulting, Inc DLS Date County/City Case No. ATRIB = 28.403 acres Determine the Impervious Area Within ATRIB (AIMP)AIMP = 14.157 acres Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB IF = 0.50 Use the following equation based on the WEF/ASCE Method CBMP = 0.858If 3 - 0.78If 2 + 0.774If + 0.04 CBMP = 0.34 Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.14 (in*ac)/ac Calculate the design storage volume of the BMP, VBMP VBMP (ft3) =VBMP = 13,950 ft3 QBMP = CBMP x I x ATRIB QBMP = 1.92 ft3/s I = Design Rainfall Intensity, 0.2 in/hr Notes: BMP Design Flow Rate, QBMP Company Name Designed By Company Project Number/Name Drainage Area Number/Name CORAL MOUNTAIN - MSA JOB #2553 DRAINAGE AREA 'D' March 30, 2020 VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) 12(in/ft) Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Determine Design Storage Volume, VBMP Legend: Required Entries Calculated Cells Determine the Impervious Area Ratio Whitewater Watershed BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014) Enter the Area Tributary to this Feature (ATRIB) MSA Consulting, Inc DLS Date County/City Case No. ATRIB = 61.802 acres Determine the Impervious Area Within ATRIB (AIMP)AIMP = 19.059 acres Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB IF = 0.31 Use the following equation based on the WEF/ASCE Method CBMP = 0.858If 3 - 0.78If 2 + 0.774If + 0.04 CBMP = 0.23 Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.09 (in*ac)/ac Calculate the design storage volume of the BMP, VBMP VBMP (ft3) =VBMP = 20,610 ft3 QBMP = CBMP x I x ATRIB QBMP = 2.84 ft3/s I = Design Rainfall Intensity, 0.2 in/hr Notes: BMP Design Flow Rate, QBMP Company Name Designed By Company Project Number/Name Drainage Area Number/Name THE WAVE - MSA JOB #2553 DRAINAGE AREA 'E' February 28, 2020 VU (in-ac/ac) x AT (ac) x 43,560 (ft2/ac) 12(in/ft) Calculate the Composite Runoff Coefficient, C for the BMP Tributary Area Determine Design Storage Volume, VBMP Legend: Required Entries Calculated Cells Determine the Impervious Area Ratio Whitewater Watershed BMP Design Volume, VBMP & Design Flow Rate , QBMP (Rev. 06-2014) Enter the Area Tributary to this Feature (ATRIB) MSA Consulting, Inc DLS Date County/City Case No. Coral Mountain Preliminary Hydrology Report Appendix H Existing Topography Exhibit Synthetic Unit Hydrograph Exhibits 58th Avenue NeighborhoodCommercial Future Low Density Residential (3) Future Low Density Residential (2) FutureLowDensityResidential (4) Low Density Residential (5) MadisonStreet60th Avenue Low Density Residential (1) The Farm Surf Resort (5) Back of House Pop-Up Village 2 Planning Area IX Surf Resort (4) Surf Resort (1) Future Planning Area VII Planning Area VIII Planning Area VIII Planning Area VIII Planning Area VIII Planning Area VIII PA IX Planning Area IX The Beach Club Pop-Up Village 3 Pop-Up Village 4 Pop-Up Village 5 The Farm Village PA X Open Space Planning Area X Surf Resort (3) Planning Area IX Surf Resort (2) Planning Area IX Open Space The Hotel Pop-Up Village 1 The Hotel Coral Mountain MSA CONSULTING, INC. 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com 58th Avenue NeighborhoodCommercial Future Low Density Residential (3) Future Low Density Residential (2) FutureLowDensityResidential (4) Low Density Residential (5) MadisonStreet60th Avenue Low Density Residential (1) The Farm Surf Resort (5) Back of House Pop-Up Village 2 Planning Area IX Surf Resort (4) Surf Resort (1) Future Planning Area VII Planning Area VIII Planning Area VIII Planning Area VIII Planning Area VIII Planning Area VIII PA IX Planning Area IX The Beach Club Pop-Up Village 3 Pop-Up Village 4 Pop-Up Village 5 The Farm Village PA X Open Space Planning Area X Surf Resort (3) Planning Area IX Surf Resort (2) Planning Area IX Open Space The Hotel Pop-Up Village 1 The Hotel Coral Mountain DA-A1 L=1,180 A=88.412 DA-A3 L=1,050 A=24.968 DA-A2 L=1,050 A=17.314 DA-B L=2,000 A=41.586 DA-C L=1,350 A=10.191 DA-D L=780 A=28.403 DA-E L=780 A=61.802 DA-F A=44.811 DA-G A=35.742 DA-I A=51.629 DA-H A=7.118 DA-OFF (N) A=11.704 DA-OFF (S) A=5.701 MSA CONSULTING, INC. 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com MSA CONSULTING, INC. 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com