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1ST SUBMITTAL PRELIMINARY HYDROLOGY REPORT 2019-10-22 For Property Located In A Portion of Sections 27 & 28, Township 6 South, Range 7 East, SBM La Quinta, California THE WAVE AT CORAL MOUNTAIN Tentative Tract Map 37815 October 2019 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 THE WAVE AT CORAL MOUNTAIN Tentative Tract Map 37815 October 2019 Prepared for: CM Wave Development, L.L.C. 2440 Junction Place, Suite 200 Boulder, CO 80301 JN: 2553 ` PRELIMINARY HYDROLOGY REPORT The Wave at 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 The Wave at 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. No groundwater was encountered in any of the exploratory borings to a depth of 51 feet. 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. Existing improvements along Madison Street have in essence created a situation where there is no emergency out-flow for storm flows exceeding the 100-year storm event. Conversations are on-going with the owners of Andalusia (to the east of the subject property) to allow for an emergency overflow route to be constructed through the development. That being said, the existing retention basins at the low points on Madison Street will need to be preserved. 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”. The Wave at Coral Mountain Preliminary Hydrology Report 2 Soil Group ‘D’ is defined by RCFCD as – “soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high- water table, soils that have a claypan or clay layer at or near the surface and soils that are shallow over n early impervious material”. 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. The Wave at Coral Mountain Preliminary Hydrology Report 3 Proposed Land Use Summaries Land uses for each of the drainage areas were analyzed based on the pr eliminary 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 t o 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 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. The Wave at Coral Mountain Preliminary Hydrology Report 4 Drainage Area ‘G’ This area is a future low-density residential development. Once developed it is anticipated approximately 3.4 acre-feet of retention will be required. Drainage Area ‘H’ This area is a future commercial development. Once developed it is anticipated approximately 1.4 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 4.9 acre-feet of retention will be required. 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 are 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. The Wave at 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 THE WAVE Latitude: 33.6202 Longitude: -116.2562 Notes REPORT PRINTED ON...9/18/2019 9:08:13 AM MSA Job No. 2553 0 3,0091, 505 Feet Blueline Streams Survey City Areas World Street Map The Wave at Coral Mountain Preliminary Hydrology Report Appendix B NFIP Flood Insurance Rate Map DEFINITIONS OF FEMA FLOOD ZONE DESIGNATIONS Moderate to Low Risk Areas In communities that participate in the NFIP, flood insurance is available to all property owners and renters in these zones: ZONE DESCRIPTION X (Shaded) Areas of 0.2% annual chance flood; areas of 1% annual chance flood with average depths of less than 1 foot or with drainage areas less than 1 square mile; and areas protected by levees from 1% annual chance flood. Insurance purchase is not required in these zones. X Areas determined to be outside the 0.2% annual chance floodplain. High Risk Areas In communities that participate in the NFIP, mandatory flood insurance purchase requirements apply to all of these zones: ZONE DESCRIPTION A Areas with a 1% annual chance of flooding and a 26% chance of flooding over the life of a 30-year mortgage. Because detailed analyses are not performed for such areas; no depths or base flood elevations are shown within these zones. AE Areas with a 1% annual chance of flooding and a 26% chance of flooding over the life of a 30-year mortgage. In most instances, base flood elevations derived from detailed analyses are shown at selected intervals within these zones. AH Areas with a 1% annual chance of shallow flooding, usually in the form of a pond, with an average depth ranging from 1 to 3 feet. These areas have a 26% chance of flooding over the life of a 30-year mortgage. Base flood elevations derived from detailed analyses are shown at selected intervals within these zones. AO River or stream flood hazard areas, and areas with a 1% or greater chance of shallow flooding each year, usually in the form of sheet flow, with an average depth ranging from 1 to 3 feet. These areas have a 26% chance of flooding over the life of a 30-year mortgage. Average flood depths derived from detailed analyses are shown within these zones. For areas of alluvial fan flooding, velocities are also determined. AR Areas with a temporarily increased flood risk due to the building or restoration of a flood control system (such as a levee or a dam). Mandatory flood insurance purchase requirements will apply, but rates will not exceed the rates for unnumbered A zones if the structure is built or restored in compliance with Zone AR floodplain management regulations. A99 Areas with a 1% annual chance of flooding that will be protected by a Federal flood control system where construction has reached specified legal requirements. No depths or base flood elevations are shown within these zones. High Risk – Coastal Areas In communities that participate in the NFIP, mandatory flood insurance purchase requirements apply to all of these zones: ZONE DESCRIPTION V Coastal areas with a 1% or greater chance of flooding and an additional hazard associated with storm waves. These areas have a 26% chance of flooding over the life of a 30-year mortgage. No base flood elevations are shown within these zones. VE Coastal areas with a 1% or greater chance of flooding and an additional hazard associated with storm waves. These areas have a 26% chance of flooding over the life of a 30-year mortgage. Base flood elevations derived from detailed analyses are shown at selected intervals within these zones. Undetermined Risk Areas ZONE DESCRIPTION D Areas with possible but undetermined flood hazards. No flood hazard analysis has been conducted. Flood insurance rates are commensurate with the uncertainty of the flood risk. The Wave at 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 of 4371910037194003719700372000037203003720600372090037212003721500371910037194003719700372000037203003720600372090037212003721500568100568400568700569000569300569600569900 568100 568400 568700 569000 569300 569600 569900 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 11") sheet. Soil Map may not be valid at this scale. 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 The Wave at 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 The Wave at 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 35.660 35.233 1.890 18.699 5.845 0.000 0.000 7.488 57.356 162.171 DA-B 0.000 0.000 2.574 6.423 1.483 20.347 0.000 0.000 10.759 41.586 DA-C 0.000 0.000 1.454 0.000 0.000 0.000 4.092 2.159 2.486 10.191 DA-D 0.000 0.000 2.408 2.323 4.712 0.000 0.000 8.129 11.404 28.976 DA-E 0.000 0.000 1.749 0.000 0.000 49.206 0.000 4.271 7.677 62.903 SUBTOTAL 35.660 35.233 10.075 27.445 12.040 69.553 4.092 22.047 89.682 305.827 FUTURE BNDY - F 0.000 0.000 0.249 0.000 0.000 42.760 0.000 0.000 1.802 44.811 FUTURE BNDY - G 0.000 0.000 0.535 0.000 0.000 34.432 0.000 0.000 3.023 37.990 FUTURE BNDY - H 0.000 0.000 0.090 0.000 7.768 0.000 0.000 0.000 0.415 8.273 FUTURE BNDY - I 0.000 0.000 0.777 0.000 0.000 48.790 0.000 0.000 5.087 54.654 TOTAL SITE 35.660 35.233 11.726 27.445 19.808 195.535 4.092 22.047 100.009 451.555 AREA RECONCILIATION MEASURED AREAS: ROCK OUTCROPPING 35.660 EXIST OPEN BRUSH 35.233 STREETS/WALKS 11.726 WATER FEATURE 27.445 COMMERCIAL 19.808 LOTS - LOW DENSITY 195.535 LOTS - MED DENSITY 4.092 LOTS - HIGH DENSITY 22.047 OPEN SPACE 100.009 TOTAL HYDROLOGIC AREA 451.555 SURVEY BOUNDARY 377.206 ADD:74.991 SUBTRACT:0.642 TOTAL AREA:451.555 TTM 37815 - C.M. WAVE DEVELOPMENT October 21, 2019 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 34.392 30.354 0.000 0.000 0.000 0.000 0.000 0.000 23.665 88.411 DA-A2 0.000 0.000 1.890 0.000 5.845 0.000 0.000 7.488 1.518 16.741 DA-A3 1.268 4.879 0.000 0.000 0.000 0.000 0.000 0.000 18.821 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 35.660 35.233 1.890 18.699 5.845 0.000 0.000 7.488 57.356 162.171 TTM 37815 - C.M. WAVE DEVELOPMENT PROPOSED LAND USE AREAS - SYNTHETIC UNIT October 21, 2019 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 35.660 35.233 1.890 18.699 5.845 0.000 0.000 7.488 57.356 162.171 38.874 DA-B 0.000 0.000 2.574 6.423 1.483 20.347 0.000 0.000 10.759 41.586 17.512 DA-C 0.000 0.000 1.454 0.000 0.000 0.000 4.092 2.159 2.486 10.191 4.419 DA-D 0.000 0.000 2.408 2.323 4.712 0.000 0.000 8.129 11.404 28.976 14.177 DA-E 0.000 0.000 1.749 0.000 0.000 49.206 0.000 4.271 7.677 62.903 19.414 DA-F 0.000 0.000 0.249 0.000 0.000 42.760 0.000 0.000 1.802 44.811 13.257 DA-G 0.000 0.000 0.535 0.000 0.000 34.432 0.000 0.000 3.023 37.990 11.167 DA-H 0.000 0.000 0.090 0.000 7.768 0.000 0.000 0.000 0.415 8.273 7.123 DA-I 0.000 0.000 0.777 0.000 0.000 48.790 0.000 0.000 5.087 54.654 15.923 TOTAL SITE 35.660 35.233 11.726 27.445 19.808 195.535 4.092 22.047 100.009 451.555 141.865 TTM 37815 - C. M. WAVE DEVELOPMENT WQMP LAND USE - IMPERVIOUS AREAS October 21, 2019 LAND USE The Wave at 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 35.660 X 93 0.09 0.05 12 B EXISTING OPEN BRUSH - POOR 35.233 X 76 0.29 0.05 2 B PAVING/HARDSCAPE 1.890 D 56 0.51 1.00 3 B WATER FEATURE 18.699 D 56 0.51 1.00 1 B COMMERCIAL 5.845 D 56 0.51 0.90 6 B SF - HIGH DENSITY 7.488 D 56 0.51 0.50 9 B LANDSCAPING 57.356 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 PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 WAVE LAGOON AMC NUMBER RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE October 21, 2019 THE WAVE 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 Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:10/21/19 [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)847,704 1,259,782 1,624,765 2,596,092 SOIL LOSSES (cu-ft)156,666 463,367 838,222 1,796,275 EFFECTIVE RAIN (in)1.17 1.35 1.34 1.36 FLOOD VOLUME (cu-ft)691,038 796,415 786,543 799,818 (acre-ft)15.86 18.28 18.06 18.36 REQUIRED STORAGE (cu-ft)691,038 796,415 786,543 799,818 (acre-ft)15.86 18.28 18.06 18.36 FACTOR OF SAFETY 4.60 3.99 4.04 3.97 STORAGE PROVIDED (cu-ft) (acre-ft) PEAK FLOW (cfs)n/a 300.82 259.77 60.61 MAXIMUM WSEL (ft)452.09 452.25 452.24 452.26 DEPTH (ft)1.09 1.25 1.24 1.26 DIFFERENCE (ft) DIFFERENCE (ft) ESTIMATED TIME TO DEWATER BASIN Based on Total Flood Volume & Average Percolation Rate (days) WAVE LAGOON DA-A THE WAVE [10] H-FEET [9] ELEVATION OF CONCENTRATION POINT 162.171 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 47.49 [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 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 3,178,217 72.96 Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:10/21/19 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 35.660 0.220 0.0189 UNDEVELOPED 0.9000 0.1979 B 76 0.29 5%0.28 35.233 0.217 0.0602 UNDEVELOPED 0.9000 0.1955 B 56 0.51 100%0.05 1.890 0.012 0.0006 DEVELOPED 0.1000 0.0012 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 5.845 0.036 0.0035 DEVELOPED 0.1800 0.0065 B 56 0.51 50%0.28 7.488 0.046 0.0130 DEVELOPED 0.5000 0.0231 B 56 0.51 10%0.46 57.356 0.354 0.1641 DEVELOPED 0.8200 0.2900 SUM 162.171 SUM 0.2661 0.7257 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.133064726 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)=0.2661 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 THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 162.17 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 58.21 17,462 17,462 549,467 0 0 17,462 0.40 451.03 2 10 0.17 4.2 0.73 0.27 0.62 0.46 75.16 22,548 40,010 550,733 0 0 40,010 0.92 451.06 3 15 0.25 4.4 0.76 0.27 0.65 0.49 80.81 24,243 64,253 552,095 0 0 64,253 1.48 451.10 4 20 0.33 4.6 0.79 0.27 0.68 0.53 86.46 25,939 90,192 553,551 0 0 90,192 2.07 451.14 5 25 0.42 5.0 0.86 0.27 0.73 0.60 97.77 29,330 119,522 555,199 0 0 119,522 2.74 451.19 6 30 0.50 5.6 0.97 0.27 0.82 0.70 114.72 34,416 153,938 557,132 0 0 153,938 3.53 451.24 7 35 0.58 6.4 1.11 0.27 0.94 0.84 137.33 41,198 195,135 559,445 0 0 195,135 4.48 451.31 8 40 0.67 8.1 1.40 0.27 1.19 1.13 185.36 55,608 250,744 562,569 0 0 250,744 5.76 451.39 9 45 0.75 13.1 2.26 0.27 1.92 2.00 326.65 97,994 348,738 568,072 0 0 348,738 8.01 451.55 10 50 0.83 34.5 5.96 0.27 5.07 5.70 931.34 279,402 628,140 583,764 0 0 628,140 14.42 451.99 11 55 0.92 6.7 1.16 0.27 0.98 0.89 145.80 43,741 671,880 586,221 0 0 671,880 15.42 452.06 12 60 1.00 3.8 0.66 0.27 0.56 0.39 63.86 19,157 691,038 587,297 0 0 691,038 15.86 452.09 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 847,704 cu-ft SOIL LOSSES 156,666 cu-ft EFFECTIVE RAIN 1.17 in FLOOD VOLUME 15.86 acft FLOOD VOLUME 691,038 cu-ft REQUIRED STORAGE 15.86 REQUIRED STORAGE 691,038 cu-ft MAX WSEL 452.09 ft PEAK FLOW RATE 931.34 cfs TOTAL BASIN LOSSES 0 cu-ft AVERAGE PERCOLATION RATE 0.00 cf/min THE WAVERCFC & 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 162.17 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 11.07 3,322 3,322 548,673 0 0 3,322 0.08 451.01 2 10 0.17 1.3 0.33 0.27 0.28 0.07 11.07 3,322 6,643 548,859 0 0 6,643 0.15 451.01 3 15 0.25 1.1 0.28 0.27 0.24 0.02 2.67 802 7,445 548,904 0 0 7,445 0.17 451.01 4 20 0.33 1.5 0.39 0.27 0.33 0.12 19.47 5,841 13,287 549,232 0 0 13,287 0.31 451.02 5 25 0.42 1.5 0.39 0.27 0.33 0.12 19.47 5,841 19,128 549,560 0 0 19,128 0.44 451.03 6 30 0.50 1.8 0.46 0.27 0.39 0.20 32.07 9,621 28,748 550,101 0 0 28,748 0.66 451.05 7 35 0.58 1.5 0.39 0.27 0.33 0.12 19.47 5,841 34,590 550,429 0 0 34,590 0.79 451.05 8 40 0.67 1.8 0.46 0.27 0.39 0.20 32.07 9,621 44,210 550,969 0 0 44,210 1.01 451.07 9 45 0.75 1.8 0.46 0.27 0.39 0.20 32.07 9,621 53,831 551,509 0 0 53,831 1.24 451.08 10 50 0.83 1.5 0.39 0.27 0.33 0.12 19.47 5,841 59,672 551,837 0 0 59,672 1.37 451.09 11 55 0.92 1.6 0.41 0.27 0.35 0.14 23.67 7,101 66,773 552,236 0 0 66,773 1.53 451.11 12 60 1.00 1.8 0.46 0.27 0.39 0.20 32.07 9,621 76,394 552,777 0 0 76,394 1.75 451.12 13 65 1.08 2.2 0.56 0.27 0.48 0.30 48.87 14,660 91,053 553,600 0 0 91,053 2.09 451.14 14 70 1.17 2.2 0.56 0.27 0.48 0.30 48.87 14,660 105,713 554,423 0 0 105,713 2.43 451.17 15 75 1.25 2.2 0.56 0.27 0.48 0.30 48.87 14,660 120,373 555,247 0 0 120,373 2.76 451.19 16 80 1.33 2.0 0.51 0.27 0.44 0.25 40.47 12,140 132,513 555,928 0 0 132,513 3.04 451.21 17 85 1.42 2.6 0.67 0.27 0.57 0.40 65.66 19,699 152,212 557,035 0 0 152,212 3.49 451.24 18 90 1.50 2.7 0.69 0.27 0.59 0.43 69.86 20,959 173,170 558,212 0 0 173,170 3.98 451.27 19 95 1.58 2.4 0.62 0.27 0.52 0.35 57.26 17,179 190,350 559,177 0 0 190,350 4.37 451.30 20 100 1.67 2.7 0.69 0.27 0.59 0.43 69.86 20,959 211,308 560,354 0 0 211,308 4.85 451.33 21 105 1.75 3.3 0.85 0.27 0.72 0.58 95.06 28,517 239,826 561,955 0 0 239,826 5.51 451.38 22 110 1.83 3.1 0.80 0.27 0.68 0.53 86.66 25,998 265,823 563,416 0 0 265,823 6.10 451.42 23 115 1.92 2.9 0.74 0.27 0.63 0.48 78.26 23,478 289,302 564,734 0 0 289,302 6.64 451.46 24 120 2.00 3.0 0.77 0.27 0.65 0.50 82.46 24,738 314,039 566,123 0 0 314,039 7.21 451.49 25 125 2.08 3.1 0.80 0.27 0.68 0.53 86.66 25,998 340,037 567,584 0 0 340,037 7.81 451.53 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 THE WAVE HYDROLOGY SHORTCUT METHOD Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 162.17 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 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 THE WAVE HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 1.08 0.27 0.92 0.81 132.85 39,855 379,893 569,822 0 0 379,893 8.72 451.60 27 135 2.25 5.0 1.28 0.27 1.09 1.02 166.45 49,934 429,826 572,626 0 0 429,826 9.87 451.68 28 140 2.33 3.5 0.90 0.27 0.76 0.63 103.46 31,037 460,863 574,370 0 0 460,863 10.58 451.73 29 145 2.42 6.8 1.75 0.27 1.48 1.48 242.03 72,610 533,473 578,448 0 0 533,473 12.25 451.84 30 150 2.50 7.3 1.87 0.27 1.59 1.61 263.03 78,909 612,381 582,879 0 0 612,381 14.06 451.96 31 155 2.58 8.2 2.11 0.27 1.79 1.84 300.82 90,247 702,628 587,948 0 0 702,628 16.13 452.11 32 160 2.67 5.9 1.52 0.27 1.29 1.25 204.24 61,272 763,900 591,389 0 0 763,900 17.54 452.20 33 165 2.75 2.0 0.51 0.27 0.44 0.25 40.47 12,140 776,040 592,071 0 0 776,040 17.82 452.22 34 170 2.83 1.8 0.46 0.27 0.39 0.20 32.07 9,621 785,660 592,611 0 0 785,660 18.04 452.24 35 175 2.92 1.8 0.46 0.27 0.39 0.20 32.07 9,621 795,281 593,152 0 0 795,281 18.26 452.25 36 180 3.00 0.6 0.15 0.27 0.13 0.02 3.78 1,134 796,415 593,215 0 0 796,415 18.28 452.25 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 463,367 cu-ft 2.14 in 1,259,782 cu-ft 452.25 ft 300.82 cfs 0 cu-ft 0.00 cf/min 1.35 in 18.28 acft 796,415 cu-ft 18.28 acft 796,415 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 10/21/19 DRAINAGE AREA-ACRES 162.17 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 4.06 1,219 1,219 548,554 0 0 1,219 0.03 451.00 2 10 0.17 0.6 0.20 0.27 0.17 0.03 4.87 1,462 2,681 548,637 0 0 2,681 0.06 451.00 3 15 0.25 0.6 0.20 0.27 0.17 0.03 4.87 1,462 4,143 548,719 0 0 4,143 0.10 451.01 4 20 0.33 0.6 0.20 0.27 0.17 0.03 4.87 1,462 5,605 548,801 0 0 5,605 0.13 451.01 5 25 0.42 0.6 0.20 0.27 0.17 0.03 4.87 1,462 7,068 548,883 0 0 7,068 0.16 451.01 6 30 0.50 0.7 0.23 0.27 0.20 0.03 5.69 1,706 8,774 548,979 0 0 8,774 0.20 451.01 7 35 0.58 0.7 0.23 0.27 0.20 0.03 5.69 1,706 10,480 549,075 0 0 10,480 0.24 451.02 8 40 0.67 0.7 0.23 0.27 0.20 0.03 5.69 1,706 12,186 549,170 0 0 12,186 0.28 451.02 9 45 0.75 0.7 0.23 0.27 0.20 0.03 5.69 1,706 13,892 549,266 0 0 13,892 0.32 451.02 10 50 0.83 0.7 0.23 0.27 0.20 0.03 5.69 1,706 15,598 549,362 0 0 15,598 0.36 451.02 11 55 0.92 0.7 0.23 0.27 0.20 0.03 5.69 1,706 17,304 549,458 0 0 17,304 0.40 451.03 12 60 1.00 0.8 0.26 0.27 0.23 0.04 6.50 1,950 19,253 549,567 0 0 19,253 0.44 451.03 13 65 1.08 0.8 0.26 0.27 0.23 0.04 6.50 1,950 21,203 549,677 0 0 21,203 0.49 451.03 14 70 1.17 0.8 0.26 0.27 0.23 0.04 6.50 1,950 23,153 549,786 0 0 23,153 0.53 451.04 15 75 1.25 0.8 0.26 0.27 0.23 0.04 6.50 1,950 25,103 549,896 0 0 25,103 0.58 451.04 16 80 1.33 0.8 0.26 0.27 0.23 0.04 6.50 1,950 27,052 550,005 0 0 27,052 0.62 451.04 17 85 1.42 0.8 0.26 0.27 0.23 0.04 6.50 1,950 29,002 550,115 0 0 29,002 0.67 451.05 18 90 1.50 0.8 0.26 0.27 0.23 0.04 6.50 1,950 30,952 550,224 0 0 30,952 0.71 451.05 19 95 1.58 0.8 0.26 0.27 0.23 0.04 6.50 1,950 32,901 550,334 0 0 32,901 0.76 451.05 20 100 1.67 0.8 0.26 0.27 0.23 0.04 6.50 1,950 34,851 550,443 0 0 34,851 0.80 451.05 21 105 1.75 0.8 0.26 0.27 0.23 0.04 6.50 1,950 36,801 550,553 0 0 36,801 0.84 451.06 22 110 1.83 0.8 0.26 0.27 0.23 0.04 6.50 1,950 38,751 550,662 0 0 38,751 0.89 451.06 23 115 1.92 0.8 0.26 0.27 0.23 0.04 6.50 1,950 40,700 550,772 0 0 40,700 0.93 451.06 24 120 2.00 0.9 0.30 0.27 0.25 0.03 5.22 1,567 42,268 550,860 0 0 42,268 0.97 451.07 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 162.17 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 THE WAVE 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 6.50 1,950 44,217 550,969 0 0 44,217 1.02 451.07 26 130 2.17 0.9 0.30 0.27 0.25 0.03 5.22 1,567 45,785 551,057 0 0 45,785 1.05 451.07 27 135 2.25 0.9 0.30 0.27 0.25 0.03 5.22 1,567 47,352 551,145 0 0 47,352 1.09 451.07 28 140 2.33 0.9 0.30 0.27 0.25 0.03 5.22 1,567 48,920 551,233 0 0 48,920 1.12 451.08 29 145 2.42 0.9 0.30 0.27 0.25 0.03 5.22 1,567 50,487 551,322 0 0 50,487 1.16 451.08 30 150 2.50 0.9 0.30 0.27 0.25 0.03 5.22 1,567 52,054 551,410 0 0 52,054 1.20 451.08 31 155 2.58 0.9 0.30 0.27 0.25 0.03 5.22 1,567 53,622 551,498 0 0 53,622 1.23 451.08 32 160 2.67 0.9 0.30 0.27 0.25 0.03 5.22 1,567 55,189 551,586 0 0 55,189 1.27 451.09 33 165 2.75 1.0 0.33 0.27 0.28 0.07 10.64 3,192 58,381 551,765 0 0 58,381 1.34 451.09 34 170 2.83 1.0 0.33 0.27 0.28 0.07 10.64 3,192 61,574 551,944 0 0 61,574 1.41 451.10 35 175 2.92 1.0 0.33 0.27 0.28 0.07 10.64 3,192 64,766 552,123 0 0 64,766 1.49 451.10 36 180 3.00 1.0 0.33 0.27 0.28 0.07 10.64 3,192 67,958 552,303 0 0 67,958 1.56 451.11 37 185 3.08 1.0 0.33 0.27 0.28 0.07 10.64 3,192 71,150 552,482 0 0 71,150 1.63 451.11 38 190 3.17 1.1 0.36 0.27 0.31 0.10 16.06 4,817 75,967 552,753 0 0 75,967 1.74 451.12 39 195 3.25 1.1 0.36 0.27 0.31 0.10 16.06 4,817 80,784 553,023 0 0 80,784 1.85 451.13 40 200 3.33 1.1 0.36 0.27 0.31 0.10 16.06 4,817 85,601 553,294 0 0 85,601 1.97 451.13 41 205 3.42 1.2 0.40 0.27 0.34 0.13 21.47 6,442 92,043 553,655 0 0 92,043 2.11 451.14 42 210 3.50 1.3 0.43 0.27 0.37 0.16 26.89 8,066 100,109 554,108 0 0 100,109 2.30 451.16 43 215 3.58 1.4 0.46 0.27 0.39 0.20 32.30 9,691 109,800 554,653 0 0 109,800 2.52 451.17 44 220 3.67 1.4 0.46 0.27 0.39 0.20 32.30 9,691 119,491 555,197 0 0 119,491 2.74 451.19 45 225 3.75 1.5 0.50 0.27 0.42 0.23 37.72 11,316 130,807 555,833 0 0 130,807 3.00 451.21 46 230 3.83 1.5 0.50 0.27 0.42 0.23 37.72 11,316 142,123 556,468 0 0 142,123 3.26 451.22 47 235 3.92 1.6 0.53 0.27 0.45 0.26 43.14 12,941 155,064 557,195 0 0 155,064 3.56 451.24 48 240 4.00 1.6 0.53 0.27 0.45 0.26 43.14 12,941 168,005 557,922 0 0 168,005 3.86 451.26 49 245 4.08 1.7 0.56 0.27 0.48 0.30 48.55 14,566 182,570 558,740 0 0 182,570 4.19 451.29 50 250 4.17 1.8 0.60 0.27 0.51 0.33 53.97 16,190 198,761 559,649 0 0 198,761 4.56 451.31 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 162.17 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 THE WAVE 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 59.38 17,815 216,576 560,650 0 0 216,576 4.97 451.34 52 260 4.33 2.0 0.66 0.27 0.56 0.40 64.80 19,440 236,016 561,741 0 0 236,016 5.42 451.37 53 265 4.42 2.1 0.70 0.27 0.59 0.43 70.22 21,065 257,080 562,924 0 0 257,080 5.90 451.40 54 270 4.50 2.1 0.70 0.27 0.59 0.43 70.22 21,065 278,145 564,108 0 0 278,145 6.39 451.44 55 275 4.58 2.2 0.73 0.27 0.62 0.46 75.63 22,689 300,834 565,382 0 0 300,834 6.91 451.47 56 280 4.67 2.3 0.76 0.27 0.65 0.50 81.05 24,314 325,148 566,747 0 0 325,148 7.46 451.51 57 285 4.75 2.4 0.79 0.27 0.68 0.53 86.46 25,939 351,087 568,204 0 0 351,087 8.06 451.55 58 290 4.83 2.4 0.79 0.27 0.68 0.53 86.46 25,939 377,026 569,661 0 0 377,026 8.66 451.59 59 295 4.92 2.5 0.83 0.27 0.70 0.56 91.88 27,564 404,590 571,209 0 0 404,590 9.29 451.64 60 300 5.00 2.6 0.86 0.27 0.73 0.59 97.29 29,188 433,778 572,848 0 0 433,778 9.96 451.68 61 305 5.08 3.1 1.03 0.27 0.87 0.76 124.37 37,312 471,090 574,944 0 0 471,090 10.81 451.74 62 310 5.17 3.6 1.19 0.27 1.01 0.93 151.45 45,436 516,526 577,496 0 0 516,526 11.86 451.81 63 315 5.25 3.9 1.29 0.27 1.10 1.03 167.70 50,310 566,837 580,321 0 0 566,837 13.01 451.89 64 320 5.33 4.2 1.39 0.27 1.18 1.12 183.95 55,185 622,021 583,421 0 0 622,021 14.28 451.98 65 325 5.42 4.7 1.56 0.27 1.32 1.29 211.03 63,308 685,330 586,976 0 0 685,330 15.73 452.08 66 330 5.50 5.6 1.85 0.27 1.58 1.59 259.77 77,931 763,261 591,353 0 0 763,261 17.52 452.20 67 335 5.58 1.9 0.63 0.27 0.53 0.36 59.38 17,815 781,076 592,354 0 0 781,076 17.93 452.23 68 340 5.67 0.9 0.30 0.27 0.25 0.03 5.22 1,567 782,643 592,442 0 0 782,643 17.97 452.23 69 345 5.75 0.6 0.20 0.27 0.17 0.03 4.87 1,462 784,106 592,524 0 0 784,106 18.00 452.23 70 350 5.83 0.5 0.17 0.27 0.14 0.02 4.06 1,219 785,324 592,592 0 0 785,324 18.03 452.24 71 355 5.92 0.3 0.10 0.27 0.08 0.01 2.44 731 786,055 592,633 0 0 786,055 18.05 452.24 72 360 6.00 0.2 0.07 0.27 0.06 0.01 1.62 487 786,543 592,661 0 0 786,543 18.06 452.24 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 1,624,765 cu-ft 2.76 in 838,222 cu-ft 452.24 ft 259.77 cfs 0.00 cf/min 0 cu-ft 1.34 in 18.06 acft 786,543 cu-ft 18.06 acft 786,543 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 10/21/19 DRAINAGE AREA-ACRES 162.17 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 0.470 0.030 0.01 0.87 779 779 548,530 0 0 779 0.02 451.00 2 30 0.50 0.3 0.053 0.464 0.045 0.01 1.30 1,168 1,947 548,595 0 0 1,947 0.04 451.00 3 45 0.75 0.3 0.053 0.459 0.045 0.01 1.30 1,168 3,115 548,661 0 0 3,115 0.07 451.00 4 60 1.00 0.4 0.071 0.454 0.060 0.01 1.73 1,558 4,673 548,748 0 0 4,673 0.11 451.01 5 75 1.25 0.3 0.053 0.448 0.045 0.01 1.30 1,168 5,841 548,814 0 0 5,841 0.13 451.01 6 90 1.50 0.3 0.053 0.443 0.045 0.01 1.30 1,168 7,009 548,880 0 0 7,009 0.16 451.01 7 105 1.75 0.3 0.053 0.438 0.045 0.01 1.30 1,168 8,178 548,945 0 0 8,178 0.19 451.01 8 120 2.00 0.4 0.071 0.432 0.060 0.01 1.73 1,558 9,735 549,033 0 0 9,735 0.22 451.02 9 135 2.25 0.4 0.071 0.427 0.060 0.01 1.73 1,558 11,293 549,120 0 0 11,293 0.26 451.02 10 150 2.50 0.4 0.071 0.422 0.060 0.01 1.73 1,558 12,851 549,208 0 0 12,851 0.30 451.02 11 165 2.75 0.5 0.088 0.417 0.075 0.01 2.16 1,947 14,798 549,317 0 0 14,798 0.34 451.02 12 180 3.00 0.5 0.088 0.412 0.075 0.01 2.16 1,947 16,745 549,426 0 0 16,745 0.38 451.03 13 195 3.25 0.5 0.088 0.407 0.075 0.01 2.16 1,947 18,692 549,536 0 0 18,692 0.43 451.03 14 210 3.50 0.5 0.088 0.402 0.075 0.01 2.16 1,947 20,639 549,645 0 0 20,639 0.47 451.03 15 225 3.75 0.5 0.088 0.397 0.075 0.01 2.16 1,947 22,586 549,755 0 0 22,586 0.52 451.04 16 240 4.00 0.6 0.106 0.392 0.090 0.02 2.60 2,336 24,922 549,886 0 0 24,922 0.57 451.04 17 255 4.25 0.6 0.106 0.387 0.090 0.02 2.60 2,336 27,259 550,017 0 0 27,259 0.63 451.04 18 270 4.50 0.7 0.123 0.382 0.105 0.02 3.03 2,726 29,985 550,170 0 0 29,985 0.69 451.05 19 285 4.75 0.7 0.123 0.377 0.105 0.02 3.03 2,726 32,711 550,323 0 0 32,711 0.75 451.05 20 300 5.00 0.8 0.141 0.372 0.120 0.02 3.46 3,115 35,826 550,498 0 0 35,826 0.82 451.06 21 315 5.25 0.6 0.106 0.367 0.090 0.02 2.60 2,336 38,163 550,629 0 0 38,163 0.88 451.06 22 330 5.50 0.7 0.123 0.362 0.105 0.02 3.03 2,726 40,888 550,782 0 0 40,888 0.94 451.06 23 345 5.75 0.8 0.141 0.358 0.120 0.02 3.46 3,115 44,004 550,957 0 0 44,004 1.01 451.07 24 360 6.00 0.8 0.141 0.353 0.120 0.02 3.46 3,115 47,119 551,132 0 0 47,119 1.08 451.07 25 375 6.25 0.9 0.159 0.348 0.135 0.02 3.89 3,505 50,624 551,329 0 0 50,624 1.16 451.08 26 390 6.50 0.9 0.159 0.344 0.135 0.02 3.89 3,505 54,129 551,526 0 0 54,129 1.24 451.09 27 405 6.75 1.0 0.176 0.339 0.150 0.03 4.33 3,894 58,023 551,745 0 0 58,023 1.33 451.09 28 420 7.00 1.0 0.176 0.334 0.150 0.03 4.33 3,894 61,917 551,963 0 0 61,917 1.42 451.10 29 435 7.25 1.0 0.176 0.330 0.150 0.03 4.33 3,894 65,811 552,182 0 0 65,811 1.51 451.10 30 450 7.50 1.1 0.194 0.325 0.165 0.03 4.76 4,284 70,094 552,423 0 0 70,094 1.61 451.11 31 465 7.75 1.2 0.212 0.321 0.180 0.03 5.19 4,673 74,767 552,685 0 0 74,767 1.72 451.12 32 480 8.00 1.3 0.229 0.316 0.195 0.03 5.62 5,062 79,830 552,970 0 0 79,830 1.83 451.13 33 495 8.25 1.5 0.265 0.312 0.225 0.04 6.49 5,841 85,671 553,298 0 0 85,671 1.97 451.13 34 510 8.50 1.5 0.265 0.308 0.225 0.04 6.49 5,841 91,512 553,626 0 0 91,512 2.10 451.14 35 525 8.75 1.6 0.282 0.303 0.240 0.04 6.92 6,231 97,743 553,976 0 0 97,743 2.24 451.15 36 540 9.00 1.7 0.300 0.299 0.255 0.00 0.13 115 97,858 553,982 0 0 97,858 2.25 451.15 37 555 9.25 1.9 0.335 0.295 0.285 0.04 6.59 5,930 103,788 554,315 0 0 103,788 2.38 451.16 38 570 9.50 2.0 0.353 0.291 0.300 0.06 10.16 9,144 112,932 554,829 0 0 112,932 2.59 451.18 39 585 9.75 2.1 0.370 0.287 0.315 0.08 13.72 12,352 125,284 555,522 0 0 125,284 2.88 451.20 40 600 10.00 2.2 0.388 0.282 0.330 0.11 17.28 15,554 140,837 556,396 0 0 140,837 3.23 451.22 41 615 10.25 1.5 0.265 0.278 0.225 0.04 6.49 5,841 146,678 556,724 0 0 146,678 3.37 451.23 42 630 10.50 1.5 0.265 0.274 0.225 0.04 6.49 5,841 152,520 557,052 0 0 152,520 3.50 451.24 43 645 10.75 2.0 0.353 0.270 0.300 0.08 13.49 12,144 164,663 557,734 0 0 164,663 3.78 451.26 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 162.17 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE 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 0.266 0.300 0.09 14.14 12,726 177,389 558,449 0 0 177,389 4.07 451.28 45 675 11.25 1.9 0.335 0.262 0.285 0.07 11.89 10,705 188,094 559,050 0 0 188,094 4.32 451.30 46 690 11.50 1.9 0.335 0.259 0.285 0.08 12.53 11,275 199,370 559,683 0 0 199,370 4.58 451.31 47 705 11.75 1.7 0.300 0.255 0.255 0.05 7.39 6,647 206,017 560,057 0 0 206,017 4.73 451.32 48 720 12.00 1.8 0.318 0.251 0.270 0.07 10.89 9,800 215,817 560,607 0 0 215,817 4.95 451.34 49 735 12.25 2.5 0.441 0.247 0.375 0.19 31.69 28,524 244,341 562,209 0 0 244,341 5.61 451.38 50 750 12.50 2.6 0.459 0.243 0.390 0.22 35.18 31,665 276,007 563,987 0 0 276,007 6.34 451.43 51 765 12.75 2.8 0.494 0.240 0.420 0.25 41.55 37,396 313,403 566,088 0 0 313,403 7.19 451.49 52 780 13.00 2.9 0.512 0.236 0.435 0.28 45.03 40,524 353,927 568,364 0 0 353,927 8.13 451.56 53 795 13.25 3.4 0.600 0.233 0.510 0.37 60.03 54,030 407,957 571,398 0 0 407,957 9.37 451.64 54 810 13.50 3.4 0.600 0.229 0.510 0.37 60.61 54,549 462,505 574,462 0 0 462,505 10.62 451.73 55 825 13.75 2.3 0.406 0.226 0.345 0.18 29.45 26,504 489,009 575,950 0 0 489,009 11.23 451.77 56 840 14.00 2.3 0.406 0.222 0.345 0.18 30.01 27,009 516,018 577,467 0 0 516,018 11.85 451.81 57 855 14.25 2.7 0.476 0.219 0.405 0.26 42.10 37,892 553,911 579,595 0 0 553,911 12.72 451.87 58 870 14.50 2.6 0.459 0.215 0.390 0.24 39.76 35,788 589,699 581,605 0 0 589,699 13.54 451.93 59 885 14.75 2.6 0.459 0.212 0.390 0.25 40.30 36,273 625,971 583,643 0 0 625,971 14.37 451.98 60 900 15.00 2.5 0.441 0.209 0.375 0.23 37.95 34,154 660,126 585,561 0 0 660,126 15.15 452.04 61 915 15.25 2.4 0.423 0.206 0.360 0.22 35.59 32,029 692,154 587,360 0 0 692,154 15.89 452.09 62 930 15.50 2.3 0.406 0.203 0.345 0.20 33.22 29,896 722,050 589,039 0 0 722,050 16.58 452.14 63 945 15.75 1.9 0.335 0.199 0.285 0.14 22.19 19,968 742,018 590,160 0 0 742,018 17.03 452.17 64 960 16.00 1.9 0.335 0.196 0.285 0.14 22.68 20,416 762,434 591,307 0 0 762,434 17.50 452.20 65 975 16.25 0.4 0.071 0.193 0.060 0.01 1.73 1,558 763,991 591,394 0 0 763,991 17.54 452.20 66 990 16.50 0.4 0.071 0.190 0.060 0.01 1.73 1,558 765,549 591,482 0 0 765,549 17.57 452.20 67 1005 16.75 0.3 0.053 0.188 0.045 0.01 1.30 1,168 766,717 591,547 0 0 766,717 17.60 452.21 68 1020 17.00 0.3 0.053 0.185 0.045 0.01 1.30 1,168 767,886 591,613 0 0 767,886 17.63 452.21 69 1035 17.25 0.5 0.088 0.182 0.075 0.01 2.16 1,947 769,833 591,722 0 0 769,833 17.67 452.21 70 1050 17.50 0.5 0.088 0.179 0.075 0.01 2.16 1,947 771,780 591,832 0 0 771,780 17.72 452.21 71 1065 17.75 0.5 0.088 0.177 0.075 0.01 2.16 1,947 773,727 591,941 0 0 773,727 17.76 452.22 72 1080 18.00 0.4 0.071 0.174 0.060 0.01 1.73 1,558 775,284 592,028 0 0 775,284 17.80 452.22 73 1095 18.25 0.4 0.071 0.171 0.060 0.01 1.73 1,558 776,842 592,116 0 0 776,842 17.83 452.22 74 1110 18.50 0.4 0.071 0.169 0.060 0.01 1.73 1,558 778,400 592,203 0 0 778,400 17.87 452.22 75 1125 18.75 0.3 0.053 0.166 0.045 0.01 1.30 1,168 779,568 592,269 0 0 779,568 17.90 452.23 76 1140 19.00 0.2 0.035 0.164 0.030 0.01 0.87 779 780,347 592,313 0 0 780,347 17.91 452.23 77 1155 19.25 0.3 0.053 0.162 0.045 0.01 1.30 1,168 781,515 592,378 0 0 781,515 17.94 452.23 78 1170 19.50 0.4 0.071 0.160 0.060 0.01 1.73 1,558 783,073 592,466 0 0 783,073 17.98 452.23 79 1185 19.75 0.3 0.053 0.157 0.045 0.01 1.30 1,168 784,241 592,532 0 0 784,241 18.00 452.23 80 1200 20.00 0.2 0.035 0.155 0.030 0.01 0.87 779 785,020 592,575 0 0 785,020 18.02 452.24 81 1215 20.25 0.3 0.053 0.153 0.045 0.01 1.30 1,168 786,188 592,641 0 0 786,188 18.05 452.24 82 1230 20.50 0.3 0.053 0.151 0.045 0.01 1.30 1,168 787,356 592,706 0 0 787,356 18.08 452.24 83 1245 20.75 0.3 0.053 0.149 0.045 0.01 1.30 1,168 788,525 592,772 0 0 788,525 18.10 452.24 84 1260 21.00 0.2 0.035 0.147 0.030 0.01 0.87 779 789,303 592,816 0 0 789,303 18.12 452.24 85 1275 21.25 0.3 0.053 0.146 0.045 0.01 1.30 1,168 790,472 592,881 0 0 790,472 18.15 452.24 86 1290 21.50 0.2 0.035 0.144 0.030 0.01 0.87 779 791,250 592,925 0 0 791,250 18.16 452.24 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 162.17 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE 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 0.142 0.045 0.01 1.30 1,168 792,419 592,991 0 0 792,419 18.19 452.25 88 1320 22.00 0.2 0.035 0.141 0.030 0.01 0.87 779 793,197 593,035 0 0 793,197 18.21 452.25 89 1335 22.25 0.3 0.053 0.140 0.045 0.01 1.30 1,168 794,366 593,100 0 0 794,366 18.24 452.25 90 1350 22.50 0.2 0.035 0.138 0.030 0.01 0.87 779 795,145 593,144 0 0 795,145 18.25 452.25 91 1365 22.75 0.2 0.035 0.137 0.030 0.01 0.87 779 795,923 593,188 0 0 795,923 18.27 452.25 92 1380 23.00 0.2 0.035 0.136 0.030 0.01 0.87 779 796,702 593,231 0 0 796,702 18.29 452.25 93 1395 23.25 0.2 0.035 0.135 0.030 0.01 0.87 779 797,481 593,275 0 0 797,481 18.31 452.25 94 1410 23.50 0.2 0.035 0.134 0.030 0.01 0.87 779 798,260 593,319 0 0 798,260 18.33 452.26 95 1425 23.75 0.2 0.035 0.134 0.030 0.01 0.87 779 799,039 593,363 0 0 799,039 18.34 452.26 96 1440 24.00 0.2 0.035 0.133 0.030 0.01 0.87 779 799,818 593,406 0 0 799,818 18.36 452.26 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 4.41 in 2,596,092 cu-ft 1,796,275 cu-ft 452.26 ft 60.61 cfs 0 cu-ft 0.00 cf/min 1.36 in 18.36 acft 799,818 cu-ft 18.36 acft 799,818 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) 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 THE WAVE 2553 ()()2121213 1 AAAAEEV++−= 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 34.392 X 93 0.09 0.05 12 B EXISTING OPEN BRUSH - POOR 30.354 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 October 21, 2019 THE WAVE 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:10/21/19 [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)228,183 340,189 436,469 715,681 SOIL LOSSES (cu-ft)81,114 209,797 309,912 625,194 EFFECTIVE RAIN (in)0.46 0.41 0.39 0.28 FLOOD VOLUME (cu-ft)147,069 130,392 126,557 90,487 (acre-ft)3.38 2.99 2.91 2.08 REQUIRED STORAGE (cu-ft)140,942 113,294 95,573 19,657 (acre-ft)3.24 2.60 2.19 0.45 FACTOR OF SAFETY 1.10 1.37 1.62 7.87 STORAGE PROVIDED (cu-ft) (acre-ft) PEAK FLOW (cfs)n/a 70.45 58.94 7.64 MAXIMUM WSEL (ft)460.83 460.50 460.29 459.28 DEPTH (ft)1.83 1.50 1.29 0.28 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 THE WAVE [10] H-FEET [9] ELEVATION OF CONCENTRATION POINT 88.411 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:10/21/19 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 34.392 0.389 0.0334 UNDEVELOPED 0.9000 0.3501 B 76 0.29 5%0.28 30.354 0.343 0.0951 UNDEVELOPED 0.9000 0.3090 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 88.411 SUM 0.2527 0.8786 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.126372619 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)=0.2527 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 THE WAVE 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 10/21/19 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 66,000 458 458 997 0.02 459.01 2 10 0.17 4.2 0.36 0.25 0.31 0.11 9.41 2,824 3,821 66,382 461 461 3,360 0.08 459.05 3 15 0.25 4.4 0.38 0.25 0.33 0.12 10.94 3,281 6,640 66,838 464 464 6,176 0.14 459.09 4 20 0.33 4.6 0.39 0.25 0.34 0.14 12.46 3,737 9,913 67,367 468 468 9,445 0.22 459.13 5 25 0.42 5.0 0.43 0.25 0.37 0.17 15.50 4,650 14,095 68,042 473 473 13,623 0.31 459.19 6 30 0.50 5.6 0.48 0.25 0.42 0.23 20.06 6,019 19,641 68,938 479 479 19,163 0.44 459.27 7 35 0.58 6.4 0.55 0.25 0.48 0.29 26.15 7,844 27,007 70,128 487 487 26,520 0.61 459.37 8 40 0.67 8.1 0.69 0.25 0.61 0.44 39.08 11,723 38,243 71,944 500 500 37,744 0.87 459.53 9 45 0.75 13.1 1.12 0.25 0.98 0.86 77.11 23,133 60,876 75,600 525 525 60,351 1.39 459.84 10 50 0.83 34.5 2.94 0.25 2.59 2.69 239.88 71,964 132,315 86,199 599 599 131,716 3.02 460.72 11 55 0.92 6.7 0.57 0.25 0.50 0.32 28.43 8,529 140,245 87,357 607 607 139,638 3.21 460.82 12 60 1.00 3.8 0.32 0.25 0.28 0.07 6.37 1,911 141,550 87,547 608 608 140,942 3.24 460.83 TOTAL RAINFALL 0.71 in RAINFALL VOLUME 228,183 cu-ft SOIL LOSSES 81,114 cu-ft EFFECTIVE RAIN 0.46 in FLOOD VOLUME 3.38 acft FLOOD VOLUME 147,069 cu-ft REQUIRED STORAGE 3.24 REQUIRED STORAGE 140,942 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 THE WAVERCFC & 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 2.42 725 2,867 66,228 460 460 2,407 0.06 459.03 14 70 1.17 2.2 0.28 0.25 0.25 0.03 2.42 725 3,131 66,271 460 460 2,671 0.06 459.04 15 75 1.25 2.2 0.28 0.25 0.25 0.03 2.42 725 3,396 66,314 461 461 2,935 0.07 459.04 16 80 1.33 2.0 0.25 0.25 0.22 0.00 0.15 44 2,979 66,246 460 460 2,519 0.06 459.04 17 85 1.42 2.6 0.33 0.25 0.29 0.08 6.95 2,085 4,605 66,509 462 462 4,143 0.10 459.06 18 90 1.50 2.7 0.34 0.25 0.30 0.09 8.09 2,426 6,569 66,826 464 464 6,104 0.14 459.09 19 95 1.58 2.4 0.31 0.25 0.27 0.05 4.68 1,405 7,509 66,978 465 465 7,044 0.16 459.10 20 100 1.67 2.7 0.34 0.25 0.30 0.09 8.09 2,426 9,470 67,295 467 467 9,003 0.21 459.13 21 105 1.75 3.3 0.42 0.25 0.37 0.17 14.89 4,467 13,469 67,941 472 472 12,998 0.30 459.18 22 110 1.83 3.1 0.39 0.25 0.35 0.14 12.62 3,786 16,784 68,477 476 476 16,308 0.37 459.23 23 115 1.92 2.9 0.37 0.25 0.32 0.12 10.35 3,106 19,414 68,902 478 478 18,936 0.43 459.26 24 120 2.00 3.0 0.38 0.25 0.34 0.13 11.49 3,446 22,382 69,381 482 482 21,900 0.50 459.31 25 125 2.08 3.1 0.39 0.25 0.35 0.14 12.62 3,786 25,686 69,915 486 486 25,201 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 THE WAVE 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 THE WAVE HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 0.53 0.25 0.47 0.28 25.09 7,528 32,729 71,053 493 493 32,236 0.74 459.45 27 135 2.25 5.0 0.64 0.25 0.56 0.38 34.17 10,250 42,486 72,629 504 504 41,981 0.96 459.59 28 140 2.33 3.5 0.45 0.25 0.39 0.19 17.16 5,147 47,129 73,379 510 510 46,619 1.07 459.65 29 145 2.42 6.8 0.86 0.25 0.76 0.61 54.58 16,373 62,992 75,942 527 527 62,465 1.43 459.87 30 150 2.50 7.3 0.93 0.25 0.82 0.68 60.25 18,074 80,539 78,636 546 546 79,993 1.84 460.10 31 155 2.58 8.2 1.04 0.25 0.92 0.79 70.45 21,136 101,129 81,644 567 567 100,562 2.31 460.35 32 160 2.67 5.9 0.75 0.25 0.66 0.50 44.37 13,312 113,874 83,505 580 580 113,294 2.60 460.50 33 165 2.75 2.0 0.25 0.25 0.22 0.00 0.15 44 113,338 83,427 579 579 112,759 2.59 460.50 34 170 2.83 1.8 0.23 0.25 0.20 0.03 2.48 743 113,502 83,451 580 580 112,923 2.59 460.50 35 175 2.92 1.8 0.23 0.25 0.20 0.03 2.48 743 113,666 83,475 580 580 113,087 2.60 460.50 36 180 3.00 0.6 0.08 0.25 0.07 0.01 0.83 248 113,334 83,426 579 579 112,755 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 209,797 cu-ft 1.06 in 340,189 cu-ft 460.50 ft 70.45 cfs 17,637 cu-ft 97.98 cf/min 0.41 in 2.99 acft 130,392 cu-ft 2.60 acft 113,294 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 10/21/19 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 THE WAVE 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 10/21/19 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 THE WAVE 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 1,281 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 2,505 66,170 460 460 2,046 0.05 459.03 49 245 4.08 1.7 0.28 0.25 0.24 0.02 2.20 660 2,706 66,202 460 460 2,246 0.05 459.03 50 250 4.17 1.8 0.29 0.25 0.26 0.04 3.66 1,097 3,343 66,305 460 460 2,883 0.07 459.04 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 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 THE WAVE 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 4,416 66,478 462 462 3,955 0.09 459.06 52 260 4.33 2.0 0.33 0.25 0.29 0.07 6.57 1,970 5,925 66,722 463 463 5,461 0.13 459.08 53 265 4.42 2.1 0.34 0.25 0.30 0.09 8.02 2,406 7,868 67,036 466 466 7,402 0.17 459.10 54 270 4.50 2.1 0.34 0.25 0.30 0.09 8.02 2,406 9,808 67,350 468 468 9,341 0.21 459.13 55 275 4.58 2.2 0.36 0.25 0.32 0.11 9.48 2,843 12,183 67,733 470 470 11,713 0.27 459.16 56 280 4.67 2.3 0.38 0.25 0.33 0.12 10.93 3,279 14,992 68,187 474 474 14,519 0.33 459.20 57 285 4.75 2.4 0.39 0.25 0.34 0.14 12.39 3,716 18,234 68,711 477 477 17,757 0.41 459.25 58 290 4.83 2.4 0.39 0.25 0.34 0.14 12.39 3,716 21,473 69,234 481 481 20,992 0.48 459.29 59 295 4.92 2.5 0.41 0.25 0.36 0.16 13.84 4,152 25,144 69,827 485 485 24,660 0.57 459.35 60 300 5.00 2.6 0.42 0.25 0.37 0.17 15.30 4,589 29,248 70,490 490 490 28,759 0.66 459.40 61 305 5.08 3.1 0.51 0.25 0.44 0.25 22.57 6,771 35,530 71,505 497 497 35,033 0.80 459.49 62 310 5.17 3.6 0.59 0.25 0.52 0.33 29.84 8,953 43,987 72,871 506 506 43,480 1.00 459.61 63 315 5.25 3.9 0.64 0.25 0.56 0.38 34.21 10,263 53,743 74,448 517 517 53,226 1.22 459.74 64 320 5.33 4.2 0.69 0.25 0.60 0.43 38.57 11,572 64,798 76,234 529 529 64,269 1.48 459.90 65 325 5.42 4.7 0.77 0.25 0.67 0.51 45.85 13,755 78,024 78,269 544 544 77,480 1.78 460.07 66 330 5.50 5.6 0.91 0.25 0.80 0.66 58.94 17,683 95,163 80,772 561 561 94,602 2.17 460.28 67 335 5.58 1.9 0.31 0.25 0.27 0.06 5.11 1,533 96,135 80,914 562 562 95,573 2.19 460.29 68 340 5.67 0.9 0.15 0.25 0.13 0.02 1.59 477 96,050 80,902 562 562 95,488 2.19 460.29 69 345 5.75 0.6 0.10 0.25 0.09 0.01 1.06 318 95,806 80,866 562 562 95,245 2.19 460.29 70 350 5.83 0.5 0.08 0.25 0.07 0.01 0.88 265 95,510 80,823 561 561 94,949 2.18 460.28 71 355 5.92 0.3 0.05 0.25 0.04 0.01 0.53 159 95,107 80,764 561 561 94,547 2.17 460.28 72 360 6.00 0.2 0.03 0.25 0.03 0.00 0.35 106 94,653 80,698 560 560 94,092 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 436,469 cu-ft 1.36 in 309,912 cu-ft 460.29 ft 58.94 cfs 90.18 cf/min 32,464 cu-ft 0.39 in 2.91 acft 126,557 cu-ft 2.19 acft 95,573 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 10/21/19 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 0.362 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 65,947 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 1,376 392 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 0.260 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 3,314 66,300 1,381 1,381 1,933 0.04 459.03 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE 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 10/21/19 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 THE WAVE 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 66,401 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 3,094 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 55 3,934 66,401 1,383 1,383 2,551 0.06 459.04 51 765 12.75 2.8 0.250 0.228 0.219 0.02 1.96 1,765 4,316 66,462 1,385 1,385 2,931 0.07 459.04 52 780 13.00 2.9 0.259 0.224 0.227 0.03 3.06 2,756 5,687 66,684 1,389 1,389 4,298 0.10 459.06 53 795 13.25 3.4 0.303 0.221 0.266 0.08 7.34 6,607 10,905 67,527 1,407 1,407 9,498 0.22 459.13 54 810 13.50 3.4 0.303 0.218 0.266 0.09 7.64 6,875 16,373 68,410 1,425 1,425 14,948 0.34 459.21 55 825 13.75 2.3 0.205 0.214 0.180 0.02 2.22 1,999 16,947 68,503 1,427 1,427 15,519 0.36 459.22 56 840 14.00 2.3 0.205 0.211 0.180 0.02 2.22 1,999 17,518 68,595 1,429 1,429 16,089 0.37 459.23 57 855 14.25 2.7 0.241 0.208 0.212 0.03 2.95 2,651 18,740 68,793 1,433 1,433 17,306 0.40 459.24 58 870 14.50 2.6 0.232 0.205 0.204 0.03 2.43 2,189 19,496 68,915 1,436 1,436 18,060 0.41 459.25 59 885 14.75 2.6 0.232 0.202 0.204 0.03 2.71 2,440 20,501 69,077 1,439 1,439 19,062 0.44 459.27 60 900 15.00 2.5 0.223 0.198 0.196 0.02 2.19 1,972 21,034 69,163 1,441 1,441 19,593 0.45 459.27 61 915 15.25 2.4 0.214 0.195 0.188 0.02 1.67 1,500 21,093 69,173 1,441 1,441 19,652 0.45 459.28 62 930 15.50 2.3 0.205 0.192 0.180 0.01 1.14 1,024 20,676 69,105 1,440 1,440 19,236 0.44 459.27 63 945 15.75 1.9 0.169 0.189 0.149 0.02 1.83 1,651 20,887 69,140 1,440 1,440 19,447 0.45 459.27 64 960 16.00 1.9 0.169 0.187 0.149 0.02 1.83 1,651 21,098 69,174 1,441 1,441 19,657 0.45 459.28 65 975 16.25 0.4 0.036 0.184 0.031 0.00 0.39 348 20,004 68,997 1,437 1,437 18,567 0.43 459.26 66 990 16.50 0.4 0.036 0.181 0.031 0.00 0.39 348 18,914 68,821 1,434 1,434 17,481 0.40 459.24 67 1005 16.75 0.3 0.027 0.178 0.024 0.00 0.29 261 17,741 68,631 1,430 1,430 16,311 0.37 459.23 68 1020 17.00 0.3 0.027 0.175 0.024 0.00 0.29 261 16,572 68,442 1,426 1,426 15,146 0.35 459.21 69 1035 17.25 0.5 0.045 0.173 0.039 0.01 0.48 434 15,581 68,282 1,423 1,423 14,158 0.33 459.20 70 1050 17.50 0.5 0.045 0.170 0.039 0.01 0.48 434 14,593 68,123 1,419 1,419 13,173 0.30 459.18 71 1065 17.75 0.5 0.045 0.168 0.039 0.01 0.48 434 13,608 67,963 1,416 1,416 12,192 0.28 459.17 72 1080 18.00 0.4 0.036 0.165 0.031 0.00 0.39 348 12,540 67,791 1,412 1,412 11,127 0.26 459.16 73 1095 18.25 0.4 0.036 0.163 0.031 0.00 0.39 348 11,475 67,619 1,409 1,409 10,066 0.23 459.14 74 1110 18.50 0.4 0.036 0.160 0.031 0.00 0.39 348 10,414 67,447 1,405 1,405 9,009 0.21 459.13 75 1125 18.75 0.3 0.027 0.158 0.024 0.00 0.29 261 9,269 67,263 1,401 1,401 7,868 0.18 459.11 76 1140 19.00 0.2 0.018 0.156 0.016 0.00 0.19 174 8,042 67,064 1,397 1,397 6,645 0.15 459.09 77 1155 19.25 0.3 0.027 0.154 0.024 0.00 0.29 261 6,905 66,881 1,393 1,393 5,512 0.13 459.08 78 1170 19.50 0.4 0.036 0.152 0.031 0.00 0.39 348 5,859 66,712 1,390 1,390 4,470 0.10 459.06 79 1185 19.75 0.3 0.027 0.149 0.024 0.00 0.29 261 4,730 66,529 1,386 1,386 3,344 0.08 459.05 80 1200 20.00 0.2 0.018 0.147 0.016 0.00 0.19 174 3,518 66,333 1,382 1,382 2,136 0.05 459.03 81 1215 20.25 0.3 0.027 0.145 0.024 0.00 0.29 261 2,397 66,152 1,378 1,378 1,019 0.02 459.01 82 1230 20.50 0.3 0.027 0.144 0.024 0.00 0.29 261 1,279 65,972 1,374 1,279 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 10/21/19 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 THE WAVE 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 715,681 cu-ft 625,194 cu-ft 459.28 ft 7.64 cfs 90,487 cu-ft 62.84 cf/min 0.28 in 2.08 acft 90,487 cu-ft 0.45 acft 19,657 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 THE WAVE 2553 ()()2121213 1 AAAAEEV++−= 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 1.890 D 56 0.51 1.00 1 B COMMERCIAL 5.845 D 56 0.51 0.90 6 B SF - HIGH DENSITY 7.488 D 56 0.51 0.50 9 B LANDSCAPING 1.518 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 October 21, 2019 PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION THE WAVE REQUIRED 10 YEAR STORAGE DA-A2 PROJECT: Job No.: BY:DATE:10/21/19 [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)43,147 64,416 82,647 135,517 SOIL LOSSES (cuft)12,588 31,175 38,561 71,514 EFFECTIVE RAIN (in)0.50 0.55 0.73 1.05 FLOOD VOLUME (cu-ft)30,559 33,241 44,087 64,003 (acre-ft)0.70 0.76 1.01 1.47 PEAK FLOW (cfs)N/A 14.11 11.93 2.11 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 THE WAVE [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. 16.741 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:10/21/19 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 1.890 0.113 0.0058 DEVELOPED 0.1000 0.0113 B 56 0.51 90%0.10 5.845 0.349 0.0338 DEVELOPED 0.1800 0.0628 B 56 0.51 50%0.28 7.488 0.447 0.1255 DEVELOPED 0.5000 0.2236 B 56 0.51 10%0.46 1.518 0.091 0.0421 DEVELOPED 0.8200 0.0744 SUM 16.741 SUM 0.2071 0.3721 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.103567836 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00192 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55 =0.00192 0.10 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.2071 in/hr Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.3721 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 THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 16.74 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 1.68 2 10 0.17 4.2 0.36 0.21 0.13 0.15 2.54 3 15 0.25 4.4 0.37 0.21 0.14 0.17 2.83 4 20 0.33 4.6 0.39 0.21 0.15 0.18 3.12 5 25 0.42 5.0 0.43 0.21 0.16 0.22 3.69 6 30 0.50 5.6 0.48 0.21 0.18 0.27 4.56 7 35 0.58 6.4 0.55 0.21 0.20 0.34 5.71 8 40 0.67 8.1 0.69 0.21 0.26 0.48 8.15 9 45 0.75 13.1 1.12 0.21 0.42 0.91 15.34 10 50 0.83 34.5 2.94 0.21 1.09 2.73 46.12 11 55 0.92 6.7 0.57 0.21 0.21 0.36 6.14 12 60 1.00 3.8 0.32 0.21 0.12 0.12 1.97 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)0.71 RAINFALL VOLUME (cuft)43,147 SOIL LOSSES (cuft)12,588 EFFECTIVE RAIN (in)0.50 FLOOD VOLUME (acft)0.70 FLOOD VOLUME (cuft)30,559 PEAK FLOW RATE (cfs)46.12 in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE HYDROLOGY SHORTCUT METHOD Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 10/21/19 DRAINAGE AREA-ACRES 16.74 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 1.75 2 10 0.17 1.3 0.17 0.21 0.06 0.10 1.75 3 15 0.25 1.1 0.14 0.21 0.05 0.09 1.48 4 20 0.33 1.5 0.19 0.21 0.07 0.12 2.02 5 25 0.42 1.5 0.19 0.21 0.07 0.12 2.02 6 30 0.50 1.8 0.23 0.21 0.09 0.02 0.37 7 35 0.58 1.5 0.19 0.21 0.07 0.12 2.02 8 40 0.67 1.8 0.23 0.21 0.09 0.02 0.37 9 45 0.75 1.8 0.23 0.21 0.09 0.02 0.37 10 50 0.83 1.5 0.19 0.21 0.07 0.12 2.02 11 55 0.92 1.6 0.20 0.21 0.08 0.13 2.16 12 60 1.00 1.8 0.23 0.21 0.09 0.02 0.37 13 65 1.08 2.2 0.28 0.21 0.10 0.07 1.23 14 70 1.17 2.2 0.28 0.21 0.10 0.07 1.23 15 75 1.25 2.2 0.28 0.21 0.10 0.07 1.23 16 80 1.33 2.0 0.25 0.21 0.09 0.05 0.80 17 85 1.42 2.6 0.33 0.21 0.12 0.12 2.09 18 90 1.50 2.7 0.34 0.21 0.13 0.14 2.30 19 95 1.58 2.4 0.31 0.21 0.11 0.10 1.66 20 100 1.67 2.7 0.34 0.21 0.13 0.14 2.30 21 105 1.75 3.3 0.42 0.21 0.16 0.21 3.59 22 110 1.83 3.1 0.39 0.21 0.15 0.19 3.16 23 115 1.92 2.9 0.37 0.21 0.14 0.16 2.73 24 120 2.00 3.0 0.38 0.21 0.14 0.17 2.95 25 125 2.08 3.1 0.39 0.21 0.15 0.19 3.16 26 130 2.17 4.2 0.53 0.21 0.20 0.33 5.52 27 135 2.25 5.0 0.64 0.21 0.24 0.43 7.24 28 140 2.33 3.5 0.45 0.21 0.17 0.24 4.02 29 145 2.42 6.8 0.86 0.21 0.32 0.66 11.10 30 150 2.50 7.3 0.93 0.21 0.35 0.72 12.18 31 155 2.58 8.2 1.04 0.21 0.39 0.84 14.11 32 160 2.67 5.9 0.75 0.21 0.28 0.54 9.17 33 165 2.75 2.0 0.25 0.21 0.09 0.05 0.80 34 170 2.83 1.8 0.23 0.21 0.09 0.02 0.37 35 175 2.92 1.8 0.23 0.21 0.09 0.02 0.37 36 180 3.00 0.6 0.08 0.21 0.03 0.05 0.81 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)1.06 RAINFALL VOLUME (cuft)64,416 SOIL LOSSES (cuft)31,175 EFFECTIVE RAIN (in)0.55 FLOOD VOLUME (acft)0.76 FLOOD VOLUME (cuft)33,241 PEAK FLOW RATE (cfs)14.11 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 16.74 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 0.207 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 0.86 2 10 0.17 0.6 0.098 0.21 0.04 0.06 1.04 3 15 0.25 0.6 0.098 0.21 0.04 0.06 1.04 4 20 0.33 0.6 0.098 0.21 0.04 0.06 1.04 5 25 0.42 0.6 0.098 0.21 0.04 0.06 1.04 6 30 0.50 0.7 0.114 0.21 0.04 0.07 1.21 7 35 0.58 0.7 0.114 0.21 0.04 0.07 1.21 8 40 0.67 0.7 0.114 0.21 0.04 0.07 1.21 9 45 0.75 0.7 0.114 0.21 0.04 0.07 1.21 10 50 0.83 0.7 0.114 0.21 0.04 0.07 1.21 11 55 0.92 0.7 0.114 0.21 0.04 0.07 1.21 12 60 1.00 0.8 0.131 0.21 0.05 0.08 1.38 13 65 1.08 0.8 0.131 0.21 0.05 0.08 1.38 14 70 1.17 0.8 0.131 0.21 0.05 0.08 1.38 15 75 1.25 0.8 0.131 0.21 0.05 0.08 1.38 16 80 1.33 0.8 0.131 0.21 0.05 0.08 1.38 17 85 1.42 0.8 0.131 0.21 0.05 0.08 1.38 18 90 1.50 0.8 0.131 0.21 0.05 0.08 1.38 19 95 1.58 0.8 0.131 0.21 0.05 0.08 1.38 20 100 1.67 0.8 0.131 0.21 0.05 0.08 1.38 21 105 1.75 0.8 0.131 0.21 0.05 0.08 1.38 22 110 1.83 0.8 0.131 0.21 0.05 0.08 1.38 23 115 1.92 0.8 0.131 0.21 0.05 0.08 1.38 24 120 2.00 0.9 0.147 0.21 0.05 0.09 1.56 25 125 2.08 0.8 0.131 0.21 0.05 0.08 1.38 26 130 2.17 0.9 0.147 0.21 0.05 0.09 1.56 27 135 2.25 0.9 0.147 0.21 0.05 0.09 1.56 28 140 2.33 0.9 0.147 0.21 0.05 0.09 1.56 29 145 2.42 0.9 0.147 0.21 0.05 0.09 1.56 30 150 2.50 0.9 0.147 0.21 0.05 0.09 1.56 31 155 2.58 0.9 0.147 0.21 0.05 0.09 1.56 32 160 2.67 0.9 0.147 0.21 0.05 0.09 1.56 33 165 2.75 1.0 0.163 0.21 0.06 0.10 1.73 34 170 2.83 1.0 0.163 0.21 0.06 0.10 1.73 35 175 2.92 1.0 0.163 0.21 0.06 0.10 1.73 36 180 3.00 1.0 0.163 0.21 0.06 0.10 1.73 37 185 3.08 1.0 0.163 0.21 0.06 0.10 1.73 38 190 3.17 1.1 0.180 0.21 0.07 0.11 1.90 39 195 3.25 1.1 0.180 0.21 0.07 0.11 1.90 40 200 3.33 1.1 0.180 0.21 0.07 0.11 1.90 41 205 3.42 1.2 0.196 0.21 0.07 0.12 2.08 42 210 3.50 1.3 0.212 0.21 0.08 0.01 0.08 43 215 3.58 1.4 0.228 0.21 0.09 0.02 0.36 44 220 3.67 1.4 0.228 0.21 0.09 0.02 0.36 45 225 3.75 1.5 0.245 0.21 0.09 0.04 0.64 46 230 3.83 1.5 0.245 0.21 0.09 0.04 0.64 47 235 3.92 1.6 0.261 0.21 0.10 0.05 0.91 48 240 4.00 1.6 0.261 0.21 0.10 0.05 0.91 49 245 4.08 1.7 0.277 0.21 0.10 0.07 1.19 50 250 4.17 1.8 0.294 0.21 0.11 0.09 1.46 51 255 4.25 1.9 0.310 0.21 0.12 0.10 1.74 52 260 4.33 2.0 0.326 0.21 0.12 0.12 2.01 53 265 4.42 2.1 0.343 0.21 0.13 0.14 2.29 54 270 4.50 2.1 0.343 0.21 0.13 0.14 2.29 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM THE WAVERCFC & 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 10/21/19 DRAINAGE AREA-ACRES 16.74 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 0.207 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 THE WAVERCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 55 275 4.58 2.2 0.359 0.21 0.13 0.15 2.56 56 280 4.67 2.3 0.375 0.21 0.14 0.17 2.84 57 285 4.75 2.4 0.392 0.21 0.15 0.18 3.12 58 290 4.83 2.4 0.392 0.21 0.15 0.18 3.12 59 295 4.92 2.5 0.408 0.21 0.15 0.20 3.39 60 300 5.00 2.6 0.424 0.21 0.16 0.22 3.67 61 305 5.08 3.1 0.506 0.21 0.19 0.30 5.04 62 310 5.17 3.6 0.588 0.21 0.22 0.38 6.42 63 315 5.25 3.9 0.636 0.21 0.24 0.43 7.25 64 320 5.33 4.2 0.685 0.21 0.26 0.48 8.07 65 325 5.42 4.7 0.767 0.21 0.29 0.56 9.45 66 330 5.50 5.6 0.914 0.21 0.34 0.71 11.93 67 335 5.58 1.9 0.310 0.21 0.12 0.10 1.74 68 340 5.67 0.9 0.147 0.21 0.05 0.09 1.56 69 345 5.75 0.6 0.098 0.21 0.04 0.06 1.04 70 350 5.83 0.5 0.082 0.21 0.03 0.05 0.86 71 355 5.92 0.3 0.049 0.21 0.02 0.03 0.52 72 360 6.00 0.2 0.033 0.21 0.01 0.02 0.35 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)1.36 RAINFALL VOLUME (cuft)82,647 SOIL LOSSES (cuft)38,561 EFFECTIVE RAIN (in)0.73 FLOOD VOLUME (acft)1.01 FLOOD VOLUME (cuft)44,087 PEAK FLOW RATE (cfs)11.93 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 10/21/19 DRAINAGE AREA-ACRES 16.741 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2071 LAG TIME - MINUTES 3.89 MINIMUM LOSS RATE (for var. loss) - in/hr 0.104 UNIT TIME-PERCENT OF LAG 385.7 LOW LOSS RATE - DECIMAL 0.37 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00192 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 0.366 0.007 0.011 0.19 2 30 0.50 0.3 0.027 0.362 0.010 0.017 0.28 3 45 0.75 0.3 0.027 0.357 0.010 0.017 0.28 4 60 1.00 0.4 0.036 0.353 0.013 0.022 0.38 5 75 1.25 0.3 0.027 0.349 0.010 0.017 0.28 6 90 1.50 0.3 0.027 0.345 0.010 0.017 0.28 7 105 1.75 0.3 0.027 0.341 0.010 0.017 0.28 8 120 2.00 0.4 0.036 0.337 0.013 0.022 0.38 9 135 2.25 0.4 0.036 0.333 0.013 0.022 0.38 10 150 2.50 0.4 0.036 0.328 0.013 0.022 0.38 11 165 2.75 0.5 0.045 0.324 0.017 0.028 0.47 12 180 3.00 0.5 0.045 0.320 0.017 0.028 0.47 13 195 3.25 0.5 0.045 0.317 0.017 0.028 0.47 14 210 3.50 0.5 0.045 0.313 0.017 0.028 0.47 15 225 3.75 0.5 0.045 0.309 0.017 0.028 0.47 16 240 4.00 0.6 0.054 0.305 0.020 0.034 0.57 17 255 4.25 0.6 0.054 0.301 0.020 0.034 0.57 18 270 4.50 0.7 0.062 0.297 0.023 0.039 0.66 19 285 4.75 0.7 0.062 0.293 0.023 0.039 0.66 20 300 5.00 0.8 0.071 0.289 0.027 0.045 0.76 21 315 5.25 0.6 0.054 0.286 0.020 0.034 0.57 22 330 5.50 0.7 0.062 0.282 0.023 0.039 0.66 23 345 5.75 0.8 0.071 0.278 0.027 0.045 0.76 24 360 6.00 0.8 0.071 0.275 0.027 0.045 0.76 25 375 6.25 0.9 0.080 0.271 0.030 0.050 0.85 26 390 6.50 0.9 0.080 0.267 0.030 0.050 0.85 27 405 6.75 1.0 0.089 0.264 0.033 0.056 0.95 28 420 7.00 1.0 0.089 0.260 0.033 0.056 0.95 29 435 7.25 1.0 0.089 0.257 0.033 0.056 0.95 30 450 7.50 1.1 0.098 0.253 0.037 0.062 1.04 31 465 7.75 1.2 0.107 0.250 0.040 0.067 1.13 32 480 8.00 1.3 0.116 0.246 0.043 0.073 1.23 33 495 8.25 1.5 0.134 0.243 0.050 0.084 1.42 34 510 8.50 1.5 0.134 0.239 0.050 0.084 1.42 35 525 8.75 1.6 0.143 0.236 0.053 0.090 1.51 36 540 9.00 1.7 0.152 0.233 0.056 0.095 1.61 37 555 9.25 1.9 0.169 0.230 0.063 0.106 1.80 38 570 9.50 2.0 0.178 0.226 0.066 0.112 1.89 39 585 9.75 2.1 0.187 0.223 0.070 0.118 1.99 40 600 10.00 2.2 0.196 0.220 0.073 0.123 2.08 41 615 10.25 1.5 0.134 0.217 0.050 0.084 1.42 42 630 10.50 1.5 0.134 0.213 0.050 0.084 1.42 43 645 10.75 2.0 0.178 0.210 0.066 0.112 1.89 44 660 11.00 2.0 0.178 0.207 0.066 0.112 1.89 45 675 11.25 1.9 0.169 0.204 0.063 0.106 1.80 46 690 11.50 1.9 0.169 0.201 0.063 0.106 1.80 47 705 11.75 1.7 0.152 0.198 0.056 0.095 1.61 48 720 12.00 1.8 0.161 0.195 0.060 0.101 1.70 49 735 12.25 2.5 0.223 0.192 0.083 0.031 0.52 50 750 12.50 2.6 0.232 0.190 0.086 0.042 0.72 51 765 12.75 2.8 0.250 0.187 0.093 0.063 1.07 52 780 13.00 2.9 0.259 0.184 0.096 0.075 1.26 53 795 13.25 3.4 0.303 0.181 0.113 0.122 2.06 54 810 13.50 3.4 0.303 0.178 0.113 0.125 2.11 55 825 13.75 2.3 0.205 0.176 0.076 0.030 0.50 56 840 14.00 2.3 0.205 0.173 0.076 0.032 0.54 57 855 14.25 2.7 0.241 0.170 0.090 0.071 1.19 58 870 14.50 2.6 0.232 0.168 0.086 0.064 1.08 59 885 14.75 2.6 0.232 0.165 0.086 0.067 1.13 60 900 15.00 2.5 0.223 0.163 0.083 0.060 1.02 61 915 15.25 2.4 0.214 0.160 0.080 0.054 0.91 62 930 15.50 2.3 0.205 0.158 0.076 0.047 0.80 63 945 15.75 1.9 0.169 0.155 0.063 0.014 0.24 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 16.741 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.2071 LAG TIME - MINUTES 3.89 MINIMUM LOSS RATE (for var. loss) - in/hr 0.104 UNIT TIME-PERCENT OF LAG 385.7 LOW LOSS RATE - DECIMAL 0.37 TOTAL ADJUSTED STORM RAIN-INCHES 2.23 C 0.00192 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 THE WAVE HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 64 960 16.00 1.9 0.169 0.153 0.063 0.017 0.28 65 975 16.25 0.4 0.036 0.151 0.013 0.022 0.38 66 990 16.50 0.4 0.036 0.148 0.013 0.022 0.38 67 1005 16.75 0.3 0.027 0.146 0.010 0.017 0.28 68 1020 17.00 0.3 0.027 0.144 0.010 0.017 0.28 69 1035 17.25 0.5 0.045 0.142 0.017 0.028 0.47 70 1050 17.50 0.5 0.045 0.140 0.017 0.028 0.47 71 1065 17.75 0.5 0.045 0.137 0.017 0.028 0.47 72 1080 18.00 0.4 0.036 0.135 0.013 0.022 0.38 73 1095 18.25 0.4 0.036 0.133 0.013 0.022 0.38 74 1110 18.50 0.4 0.036 0.131 0.013 0.022 0.38 75 1125 18.75 0.3 0.027 0.130 0.010 0.017 0.28 76 1140 19.00 0.2 0.018 0.128 0.007 0.011 0.19 77 1155 19.25 0.3 0.027 0.126 0.010 0.017 0.28 78 1170 19.50 0.4 0.036 0.124 0.013 0.022 0.38 79 1185 19.75 0.3 0.027 0.122 0.010 0.017 0.28 80 1200 20.00 0.2 0.018 0.121 0.007 0.011 0.19 81 1215 20.25 0.3 0.027 0.119 0.010 0.017 0.28 82 1230 20.50 0.3 0.027 0.118 0.010 0.017 0.28 83 1245 20.75 0.3 0.027 0.116 0.010 0.017 0.28 84 1260 21.00 0.2 0.018 0.115 0.007 0.011 0.19 85 1275 21.25 0.3 0.027 0.113 0.010 0.017 0.28 86 1290 21.50 0.2 0.018 0.112 0.007 0.011 0.19 87 1305 21.75 0.3 0.027 0.111 0.010 0.017 0.28 88 1320 22.00 0.2 0.018 0.110 0.007 0.011 0.19 89 1335 22.25 0.3 0.027 0.109 0.010 0.017 0.28 90 1350 22.50 0.2 0.018 0.108 0.007 0.011 0.19 91 1365 22.75 0.2 0.018 0.107 0.007 0.011 0.19 92 1380 23.00 0.2 0.018 0.106 0.007 0.011 0.19 93 1395 23.25 0.2 0.018 0.105 0.007 0.011 0.19 94 1410 23.50 0.2 0.018 0.104 0.007 0.011 0.19 95 1425 23.75 0.2 0.018 0.104 0.007 0.011 0.19 96 1440 24.00 0.2 0.018 0.104 0.007 0.011 0.19 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)2.23 RAINFALL VOLUME (cuft)135,517 SOIL LOSSES (cuft)71,514 EFFECTIVE RAIN (in)1.05 FLOOD VOLUME (acft)1.47 FLOOD VOLUME (cuft)64,003 PEAK FLOW (cfs)2.11 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 4.879 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 18.821 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 October 21, 2019 THE WAVE 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:10/21/19 [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)32,735 69,687 96,421 169,714 EFFECTIVE RAIN (in)0.35 0.29 0.30 0.36 FLOOD VOLUME (cu-ft)31,706 26,385 26,842 32,400 (acre-ft)0.73 0.61 0.62 0.74 REQUIRED STORAGE (cu-ft)30,482 23,002 20,513 14,135 (acre-ft)0.70 0.53 0.47 0.32 FACTOR OF SAFETY 1.12 1.49 1.67 2.42 STORAGE PROVIDED (cu-ft) (acre-ft) PEAK FLOW (cfs)n/a 15.98 12.73 1.22 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 THE WAVE [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:10/21/19 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 4.879 0.195 0.0541 UNDEVELOPED 0.9000 0.1759 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 18.821 0.754 0.3498 DEVELOPED 0.8200 0.6181 SUM 24.968 SUM 0.4083 0.8397 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.204162323 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)=0.4083 Developed Condition: Low Loss = 0.9 - (0.8 * %impervious) LOW LOSS RATE =0.8397 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 THE WAVE 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 10/21/19 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 83.97% 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 1.24 372 372 10,901 76 76 296 0.01 468.02 2 10 0.17 4.2 0.36 0.41 0.30 0.06 1.45 434 730 11,066 77 77 653 0.01 468.05 3 15 0.25 4.4 0.38 0.41 0.32 0.06 1.52 455 1,108 11,239 78 78 1,030 0.02 468.07 4 20 0.33 4.6 0.39 0.41 0.33 0.06 1.58 475 1,505 11,422 79 79 1,426 0.03 468.10 5 25 0.42 5.0 0.43 0.41 0.36 0.02 0.46 138 1,564 11,449 80 80 1,484 0.03 468.11 6 30 0.50 5.6 0.48 0.41 0.40 0.07 1.75 525 2,009 11,653 81 81 1,928 0.04 468.14 7 35 0.58 6.4 0.55 0.41 0.46 0.14 3.47 1,040 2,968 12,094 84 84 2,884 0.07 468.21 8 40 0.67 8.1 0.69 0.41 0.58 0.28 7.12 2,136 5,020 13,037 91 91 4,929 0.11 468.36 9 45 0.75 13.1 1.12 0.41 0.94 0.71 17.86 5,358 10,287 15,458 107 107 10,180 0.23 468.74 10 50 0.83 34.5 2.94 0.41 2.47 2.54 63.83 19,148 29,328 22,359 155 155 29,172 0.67 469.75 11 55 0.92 6.7 0.57 0.41 0.48 0.16 4.11 1,234 30,406 22,727 158 158 30,248 0.69 469.81 12 60 1.00 3.8 0.32 0.41 0.27 0.05 1.31 393 30,641 22,807 158 158 30,482 0.70 469.82 TOTAL RAINFALL 0.71 in RAINFALL VOLUME 64,441 cu-ft SOIL LOSSES 32,735 cu-ft EFFECTIVE RAIN 0.35 in FLOOD VOLUME 0.73 acft FLOOD VOLUME 31,706 cu-ft REQUIRED STORAGE 0.70 REQUIRED STORAGE 30,482 cu-ft MAX WSEL 469.82 ft PEAK FLOW RATE 63.83 cfs TOTAL BASIN LOSSES 1,224 cu-ft AVERAGE PERCOLATION RATE 20.39 cf/min THE WAVERCFC & 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 83.97% 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 0.67 200 200 10,822 75 75 125 0.00 468.01 2 10 0.17 1.3 0.17 0.41 0.14 0.03 0.67 200 325 10,879 76 76 250 0.01 468.02 3 15 0.25 1.1 0.14 0.41 0.12 0.02 0.56 169 419 10,923 76 76 343 0.01 468.02 4 20 0.33 1.5 0.19 0.41 0.16 0.03 0.77 231 574 10,994 76 76 498 0.01 468.04 5 25 0.42 1.5 0.19 0.41 0.16 0.03 0.77 231 729 11,065 77 77 652 0.01 468.05 6 30 0.50 1.8 0.23 0.41 0.19 0.04 0.92 277 929 11,157 77 77 852 0.02 468.06 7 35 0.58 1.5 0.19 0.41 0.16 0.03 0.77 231 1,083 11,228 78 78 1,005 0.02 468.07 8 40 0.67 1.8 0.23 0.41 0.19 0.04 0.92 277 1,282 11,319 79 79 1,203 0.03 468.09 9 45 0.75 1.8 0.23 0.41 0.19 0.04 0.92 277 1,481 11,411 79 79 1,401 0.03 468.10 10 50 0.83 1.5 0.19 0.41 0.16 0.03 0.77 231 1,632 11,480 80 80 1,553 0.04 468.11 11 55 0.92 1.6 0.20 0.41 0.17 0.03 0.82 246 1,799 11,557 80 80 1,719 0.04 468.12 12 60 1.00 1.8 0.23 0.41 0.19 0.04 0.92 277 1,996 11,647 81 81 1,915 0.04 468.14 13 65 1.08 2.2 0.28 0.41 0.23 0.04 1.13 339 2,254 11,766 82 82 2,172 0.05 468.16 14 70 1.17 2.2 0.28 0.41 0.23 0.04 1.13 339 2,511 11,884 83 83 2,429 0.06 468.18 15 75 1.25 2.2 0.28 0.41 0.23 0.04 1.13 339 2,767 12,002 83 83 2,684 0.06 468.19 16 80 1.33 2.0 0.25 0.41 0.21 0.04 1.03 308 2,992 12,105 84 84 2,908 0.07 468.21 17 85 1.42 2.6 0.33 0.41 0.28 0.05 1.33 400 3,308 12,251 85 85 3,223 0.07 468.23 18 90 1.50 2.7 0.34 0.41 0.29 0.06 1.39 416 3,639 12,403 86 86 3,553 0.08 468.26 19 95 1.58 2.4 0.31 0.41 0.26 0.05 1.23 370 3,923 12,533 87 87 3,836 0.09 468.28 20 100 1.67 2.7 0.34 0.41 0.29 0.06 1.39 416 4,252 12,684 88 88 4,163 0.10 468.30 21 105 1.75 3.3 0.42 0.41 0.35 0.01 0.29 86 4,250 12,683 88 88 4,162 0.10 468.30 22 110 1.83 3.1 0.39 0.41 0.33 0.06 1.59 477 4,639 12,862 89 89 4,550 0.10 468.33 23 115 1.92 2.9 0.37 0.41 0.31 0.06 1.49 447 4,996 13,026 90 90 4,906 0.11 468.36 24 120 2.00 3.0 0.38 0.41 0.32 0.06 1.54 462 5,368 13,197 92 92 5,276 0.12 468.38 25 125 2.08 3.1 0.39 0.41 0.33 0.06 1.59 477 5,754 13,374 93 93 5,661 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 THE WAVE 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 83.97% 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 THE WAVE HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 0.53 0.41 0.45 0.13 3.17 951 6,612 13,769 96 96 6,516 0.15 468.47 27 135 2.25 5.0 0.64 0.41 0.53 0.23 5.73 1,720 8,236 14,515 101 101 8,135 0.19 468.59 28 140 2.33 3.5 0.45 0.41 0.37 0.04 0.93 279 8,414 14,597 101 101 8,312 0.19 468.60 29 145 2.42 6.8 0.86 0.41 0.73 0.46 11.50 3,449 11,761 16,135 112 112 11,649 0.27 468.85 30 150 2.50 7.3 0.93 0.41 0.78 0.52 13.10 3,929 15,578 17,675 123 123 15,456 0.35 469.08 31 155 2.58 8.2 1.04 0.41 0.88 0.63 15.98 4,794 20,250 19,266 134 134 20,116 0.46 469.31 32 160 2.67 5.9 0.75 0.41 0.63 0.34 8.61 2,584 22,700 20,101 140 140 22,560 0.52 469.43 33 165 2.75 2.0 0.25 0.41 0.21 0.04 1.03 308 22,868 20,159 140 140 22,728 0.52 469.44 34 170 2.83 1.8 0.23 0.41 0.19 0.04 0.92 277 23,006 20,205 140 140 22,865 0.52 469.44 35 175 2.92 1.8 0.23 0.41 0.19 0.04 0.92 277 23,143 20,252 141 141 23,002 0.53 469.45 36 180 3.00 0.6 0.08 0.41 0.06 0.01 0.31 92 23,094 20,236 141 141 22,954 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 69,687 cu-ft 1.06 in 96,072 cu-ft 469.45 ft 15.98 cfs 3,432 cu-ft 19.06 cf/min 0.29 in 0.61 acft 26,385 cu-ft 0.53 acft 23,002 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 10/21/19 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 83.97% 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 10,775 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 0.40 119 186 10,816 75 75 111 0.00 468.01 4 20 0.33 0.6 0.10 0.41 0.08 0.02 0.40 119 230 10,836 75 75 154 0.00 468.01 5 25 0.42 0.6 0.10 0.41 0.08 0.02 0.40 119 273 10,855 75 75 197 0.00 468.01 6 30 0.50 0.7 0.11 0.41 0.10 0.02 0.46 138 336 10,884 76 76 260 0.01 468.02 7 35 0.58 0.7 0.11 0.41 0.10 0.02 0.46 138 399 10,913 76 76 323 0.01 468.02 8 40 0.67 0.7 0.11 0.41 0.10 0.02 0.46 138 461 10,942 76 76 385 0.01 468.03 9 45 0.75 0.7 0.11 0.41 0.10 0.02 0.46 138 523 10,971 76 76 447 0.01 468.03 10 50 0.83 0.7 0.11 0.41 0.10 0.02 0.46 138 586 10,999 76 76 509 0.01 468.04 11 55 0.92 0.7 0.11 0.41 0.10 0.02 0.46 138 647 11,028 77 77 571 0.01 468.04 12 60 1.00 0.8 0.13 0.41 0.11 0.02 0.53 158 729 11,065 77 77 652 0.01 468.05 13 65 1.08 0.8 0.13 0.41 0.11 0.02 0.53 158 810 11,102 77 77 733 0.02 468.05 14 70 1.17 0.8 0.13 0.41 0.11 0.02 0.53 158 891 11,140 77 77 814 0.02 468.06 15 75 1.25 0.8 0.13 0.41 0.11 0.02 0.53 158 972 11,177 78 78 894 0.02 468.06 16 80 1.33 0.8 0.13 0.41 0.11 0.02 0.53 158 1,052 11,214 78 78 974 0.02 468.07 17 85 1.42 0.8 0.13 0.41 0.11 0.02 0.53 158 1,133 11,251 78 78 1,054 0.02 468.08 18 90 1.50 0.8 0.13 0.41 0.11 0.02 0.53 158 1,213 11,287 78 78 1,134 0.03 468.08 19 95 1.58 0.8 0.13 0.41 0.11 0.02 0.53 158 1,292 11,324 79 79 1,214 0.03 468.09 20 100 1.67 0.8 0.13 0.41 0.11 0.02 0.53 158 1,372 11,360 79 79 1,293 0.03 468.09 21 105 1.75 0.8 0.13 0.41 0.11 0.02 0.53 158 1,451 11,397 79 79 1,372 0.03 468.10 22 110 1.83 0.8 0.13 0.41 0.11 0.02 0.53 158 1,530 11,433 79 79 1,450 0.03 468.11 23 115 1.92 0.8 0.13 0.41 0.11 0.02 0.53 158 1,608 11,469 80 80 1,529 0.04 468.11 24 120 2.00 0.9 0.15 0.41 0.12 0.02 0.59 178 1,707 11,514 80 80 1,627 0.04 468.12 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE 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 10/21/19 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 83.97% 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 THE WAVE 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 1,785 11,550 80 80 1,705 0.04 468.12 26 130 2.17 0.9 0.15 0.41 0.12 0.02 0.59 178 1,882 11,595 81 81 1,802 0.04 468.13 27 135 2.25 0.9 0.15 0.41 0.12 0.02 0.59 178 1,980 11,640 81 81 1,899 0.04 468.14 28 140 2.33 0.9 0.15 0.41 0.12 0.02 0.59 178 2,077 11,684 81 81 1,996 0.05 468.14 29 145 2.42 0.9 0.15 0.41 0.12 0.02 0.59 178 2,173 11,729 81 81 2,092 0.05 468.15 30 150 2.50 0.9 0.15 0.41 0.12 0.02 0.59 178 2,270 11,773 82 82 2,188 0.05 468.16 31 155 2.58 0.9 0.15 0.41 0.12 0.02 0.59 178 2,366 11,817 82 82 2,284 0.05 468.17 32 160 2.67 0.9 0.15 0.41 0.12 0.02 0.59 178 2,462 11,861 82 82 2,379 0.05 468.17 33 165 2.75 1.0 0.16 0.41 0.14 0.03 0.66 198 2,577 11,914 83 83 2,494 0.06 468.18 34 170 2.83 1.0 0.16 0.41 0.14 0.03 0.66 198 2,692 11,967 83 83 2,609 0.06 468.19 35 175 2.92 1.0 0.16 0.41 0.14 0.03 0.66 198 2,806 12,020 83 83 2,723 0.06 468.20 36 180 3.00 1.0 0.16 0.41 0.14 0.03 0.66 198 2,920 12,072 84 84 2,836 0.07 468.21 37 185 3.08 1.0 0.16 0.41 0.14 0.03 0.66 198 3,034 12,124 84 84 2,950 0.07 468.21 38 190 3.17 1.1 0.18 0.41 0.15 0.03 0.72 217 3,167 12,186 85 85 3,083 0.07 468.22 39 195 3.25 1.1 0.18 0.41 0.15 0.03 0.72 217 3,300 12,247 85 85 3,215 0.07 468.23 40 200 3.33 1.1 0.18 0.41 0.15 0.03 0.72 217 3,432 12,307 85 85 3,347 0.08 468.24 41 205 3.42 1.2 0.20 0.41 0.16 0.03 0.79 237 3,584 12,377 86 86 3,498 0.08 468.25 42 210 3.50 1.3 0.21 0.41 0.18 0.03 0.86 257 3,755 12,456 86 86 3,668 0.08 468.27 43 215 3.58 1.4 0.23 0.41 0.19 0.04 0.92 277 3,945 12,543 87 87 3,858 0.09 468.28 44 220 3.67 1.4 0.23 0.41 0.19 0.04 0.92 277 4,134 12,630 88 88 4,047 0.09 468.29 45 225 3.75 1.5 0.24 0.41 0.21 0.04 0.99 296 4,343 12,726 88 88 4,255 0.10 468.31 46 230 3.83 1.5 0.24 0.41 0.21 0.04 0.99 296 4,551 12,822 89 89 4,462 0.10 468.32 47 235 3.92 1.6 0.26 0.41 0.22 0.04 1.05 316 4,778 12,926 90 90 4,689 0.11 468.34 48 240 4.00 1.6 0.26 0.41 0.22 0.04 1.05 316 5,005 13,030 90 90 4,914 0.11 468.36 49 245 4.08 1.7 0.28 0.41 0.23 0.04 1.12 336 5,250 13,143 91 91 5,159 0.12 468.37 50 250 4.17 1.8 0.29 0.41 0.25 0.05 1.19 356 5,515 13,264 92 92 5,422 0.12 468.39 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 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 83.97% 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 THE WAVE 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 1.25 375 5,798 13,395 93 93 5,705 0.13 468.41 52 260 4.33 2.0 0.33 0.41 0.27 0.05 1.32 395 6,100 13,533 94 94 6,006 0.14 468.44 53 265 4.42 2.1 0.34 0.41 0.29 0.05 1.38 415 6,421 13,681 95 95 6,326 0.15 468.46 54 270 4.50 2.1 0.34 0.41 0.29 0.05 1.38 415 6,741 13,828 96 96 6,645 0.15 468.48 55 275 4.58 2.2 0.36 0.41 0.30 0.06 1.45 435 7,080 13,984 97 97 6,982 0.16 468.51 56 280 4.67 2.3 0.38 0.41 0.32 0.06 1.51 454 7,437 14,148 98 98 7,339 0.17 468.53 57 285 4.75 2.4 0.39 0.41 0.33 0.06 1.58 474 7,813 14,321 99 99 7,713 0.18 468.56 58 290 4.83 2.4 0.39 0.41 0.33 0.06 1.58 474 8,188 14,493 101 101 8,087 0.19 468.59 59 295 4.92 2.5 0.41 0.41 0.34 0.07 1.65 494 8,581 14,674 102 102 8,479 0.19 468.62 60 300 5.00 2.6 0.42 0.41 0.36 0.02 0.40 121 8,600 14,682 102 102 8,498 0.20 468.62 61 305 5.08 3.1 0.51 0.41 0.42 0.10 2.46 737 9,235 14,974 104 104 9,131 0.21 468.66 62 310 5.17 3.6 0.59 0.41 0.49 0.18 4.51 1,353 10,485 15,549 108 108 10,377 0.24 468.75 63 315 5.25 3.9 0.64 0.41 0.53 0.23 5.74 1,723 12,100 16,291 113 113 11,987 0.28 468.87 64 320 5.33 4.2 0.69 0.41 0.58 0.28 6.98 2,093 14,080 17,164 119 119 13,961 0.32 469.01 65 325 5.42 4.7 0.77 0.41 0.64 0.36 9.03 2,709 16,670 18,047 125 125 16,545 0.38 469.14 66 330 5.50 5.6 0.91 0.41 0.77 0.51 12.73 3,819 20,363 19,305 134 134 20,229 0.46 469.32 67 335 5.58 1.9 0.31 0.41 0.26 0.05 1.25 375 20,605 19,387 135 135 20,470 0.47 469.33 68 340 5.67 0.9 0.15 0.41 0.12 0.02 0.59 178 20,648 19,402 135 135 20,513 0.47 469.33 69 345 5.75 0.6 0.10 0.41 0.08 0.02 0.40 119 20,632 19,397 135 135 20,497 0.47 469.33 70 350 5.83 0.5 0.08 0.41 0.07 0.01 0.33 99 20,596 19,384 135 135 20,461 0.47 469.33 71 355 5.92 0.3 0.05 0.41 0.04 0.01 0.20 59 20,520 19,359 134 134 20,386 0.47 469.32 72 360 6.00 0.2 0.03 0.41 0.03 0.01 0.13 40 20,425 19,326 134 134 20,291 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 96,421 cu-ft 469.33 ft 12.73 cfs 18.20 cf/min 6,551 cu-ft 0.30 in 0.62 acft 26,842 cu-ft 0.47 acft 20,513 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 10/21/19 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)83.97%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 0.713 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 0.672 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 0.664 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 0.648 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 0.640 0.037 0.01 0.18 162 162 10,804 225 162 0 0.00 468.00 12 180 3.00 0.5 0.045 0.632 0.037 0.01 0.18 162 162 10,804 225 162 0 0.00 468.00 13 195 3.25 0.5 0.045 0.624 0.037 0.01 0.18 162 162 10,804 225 162 0 0.00 468.00 14 210 3.50 0.5 0.045 0.616 0.037 0.01 0.18 162 162 10,804 225 162 0 0.00 468.00 15 225 3.75 0.5 0.045 0.608 0.037 0.01 0.18 162 162 10,804 225 162 0 0.00 468.00 16 240 4.00 0.6 0.054 0.601 0.045 0.01 0.22 194 194 10,819 225 194 0 0.00 468.00 17 255 4.25 0.6 0.054 0.593 0.045 0.01 0.22 194 194 10,819 225 194 0 0.00 468.00 18 270 4.50 0.7 0.062 0.586 0.052 0.01 0.25 227 227 10,834 226 226 1 0.00 468.00 19 285 4.75 0.7 0.062 0.578 0.052 0.01 0.25 227 228 10,835 226 226 2 0.00 468.00 20 300 5.00 0.8 0.071 0.571 0.060 0.01 0.29 259 261 10,850 226 226 35 0.00 468.00 21 315 5.25 0.6 0.054 0.563 0.045 0.01 0.22 194 230 10,836 226 226 4 0.00 468.00 22 330 5.50 0.7 0.062 0.556 0.052 0.01 0.25 227 231 10,836 226 226 5 0.00 468.00 23 345 5.75 0.8 0.071 0.549 0.060 0.01 0.29 259 264 10,851 226 226 38 0.00 468.00 24 360 6.00 0.8 0.071 0.541 0.060 0.01 0.29 259 297 10,867 226 226 71 0.00 468.01 25 375 6.25 0.9 0.080 0.534 0.067 0.01 0.32 292 363 10,897 227 227 136 0.00 468.01 26 390 6.50 0.9 0.080 0.527 0.067 0.01 0.32 292 427 10,926 228 228 200 0.00 468.01 27 405 6.75 1.0 0.089 0.520 0.075 0.01 0.36 324 524 10,971 229 229 295 0.01 468.02 28 420 7.00 1.0 0.089 0.513 0.075 0.01 0.36 324 619 11,014 229 229 389 0.01 468.03 29 435 7.25 1.0 0.089 0.506 0.075 0.01 0.36 324 713 11,058 230 230 483 0.01 468.04 30 450 7.50 1.1 0.098 0.499 0.082 0.02 0.40 356 840 11,116 232 232 608 0.01 468.04 31 465 7.75 1.2 0.107 0.492 0.090 0.02 0.43 389 997 11,188 233 233 764 0.02 468.06 32 480 8.00 1.3 0.116 0.485 0.097 0.02 0.47 421 1,185 11,275 235 235 950 0.02 468.07 33 495 8.25 1.5 0.134 0.479 0.112 0.02 0.54 486 1,436 11,390 237 237 1,199 0.03 468.09 34 510 8.50 1.5 0.134 0.472 0.112 0.02 0.54 486 1,685 11,504 240 240 1,445 0.03 468.10 35 525 8.75 1.6 0.143 0.465 0.120 0.02 0.58 518 1,963 11,632 242 242 1,721 0.04 468.12 36 540 9.00 1.7 0.152 0.459 0.127 0.02 0.61 551 2,272 11,774 245 245 2,027 0.05 468.15 37 555 9.25 1.9 0.169 0.452 0.142 0.03 0.68 616 2,642 11,944 249 249 2,393 0.05 468.17 38 570 9.50 2.0 0.178 0.446 0.150 0.03 0.72 648 3,041 12,128 253 253 2,789 0.06 468.20 39 585 9.75 2.1 0.187 0.440 0.157 0.03 0.76 680 3,469 12,324 257 257 3,212 0.07 468.23 40 600 10.00 2.2 0.196 0.433 0.165 0.03 0.79 713 3,925 12,534 261 261 3,664 0.08 468.27 41 615 10.25 1.5 0.134 0.427 0.112 0.02 0.54 486 4,150 12,637 263 263 3,887 0.09 468.28 42 630 10.50 1.5 0.134 0.421 0.112 0.02 0.54 486 4,373 12,740 265 265 4,107 0.09 468.30 43 645 10.75 2.0 0.178 0.415 0.150 0.03 0.72 648 4,755 12,915 269 269 4,486 0.10 468.33 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE 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 10/21/19 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)83.97%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 THE WAVE 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 0.72 648 5,134 13,090 273 273 4,861 0.11 468.35 45 675 11.25 1.9 0.169 0.403 0.142 0.03 0.68 616 5,477 13,247 276 276 5,201 0.12 468.38 46 690 11.50 1.9 0.169 0.397 0.142 0.03 0.68 616 5,817 13,403 279 279 5,537 0.13 468.40 47 705 11.75 1.7 0.152 0.391 0.127 0.02 0.61 551 6,088 13,528 282 282 5,806 0.13 468.42 48 720 12.00 1.8 0.161 0.385 0.135 0.03 0.65 583 6,390 13,667 285 285 6,105 0.14 468.44 49 735 12.25 2.5 0.223 0.379 0.187 0.04 0.90 810 6,915 13,908 290 290 6,625 0.15 468.48 50 750 12.50 2.6 0.232 0.374 0.195 0.04 0.94 842 7,468 14,162 295 295 7,172 0.16 468.52 51 765 12.75 2.8 0.250 0.368 0.210 0.04 1.01 907 8,080 14,443 301 301 7,779 0.18 468.56 52 780 13.00 2.9 0.259 0.362 0.217 0.04 1.04 940 8,718 14,737 307 307 8,411 0.19 468.61 53 795 13.25 3.4 0.303 0.357 0.255 0.05 1.22 1,102 9,513 15,102 315 315 9,198 0.21 468.67 54 810 13.50 3.4 0.303 0.352 0.255 0.05 1.22 1,102 10,300 15,464 322 322 9,978 0.23 468.72 55 825 13.75 2.3 0.205 0.346 0.172 0.03 0.83 745 10,723 15,658 326 326 10,397 0.24 468.75 56 840 14.00 2.3 0.205 0.341 0.172 0.03 0.83 745 11,142 15,851 330 330 10,812 0.25 468.78 57 855 14.25 2.7 0.241 0.336 0.202 0.04 0.97 875 11,687 16,101 335 335 11,351 0.26 468.82 58 870 14.50 2.6 0.232 0.331 0.195 0.04 0.94 842 12,193 16,334 340 340 11,853 0.27 468.86 59 885 14.75 2.6 0.232 0.326 0.195 0.04 0.94 842 12,696 16,565 345 345 12,350 0.28 468.90 60 900 15.00 2.5 0.223 0.321 0.187 0.04 0.90 810 13,160 16,778 350 350 12,811 0.29 468.93 61 915 15.25 2.4 0.214 0.316 0.180 0.03 0.86 778 13,589 16,975 354 354 13,235 0.30 468.96 62 930 15.50 2.3 0.205 0.311 0.172 0.03 0.83 745 13,980 17,130 357 357 13,623 0.31 468.99 63 945 15.75 1.9 0.169 0.306 0.142 0.03 0.68 616 14,239 17,219 359 359 13,880 0.32 469.01 64 960 16.00 1.9 0.169 0.301 0.142 0.03 0.68 616 14,496 17,306 361 361 14,135 0.32 469.02 65 975 16.25 0.4 0.036 0.297 0.030 0.01 0.14 130 14,265 17,227 359 359 13,906 0.32 469.01 66 990 16.50 0.4 0.036 0.292 0.030 0.01 0.14 130 14,035 17,149 357 357 13,678 0.31 468.99 67 1005 16.75 0.3 0.027 0.288 0.022 0.00 0.11 97 13,775 17,061 355 355 13,420 0.31 468.97 68 1020 17.00 0.3 0.027 0.283 0.022 0.00 0.11 97 13,517 16,942 353 353 13,164 0.30 468.96 69 1035 17.25 0.5 0.045 0.279 0.037 0.01 0.18 162 13,326 16,855 351 351 12,975 0.30 468.94 70 1050 17.50 0.5 0.045 0.275 0.037 0.01 0.18 162 13,137 16,768 349 349 12,788 0.29 468.93 71 1065 17.75 0.5 0.045 0.271 0.037 0.01 0.18 162 12,950 16,681 348 348 12,602 0.29 468.91 72 1080 18.00 0.4 0.036 0.267 0.030 0.01 0.14 130 12,732 16,581 345 345 12,386 0.28 468.90 73 1095 18.25 0.4 0.036 0.263 0.030 0.01 0.14 130 12,516 16,482 343 343 12,173 0.28 468.88 74 1110 18.50 0.4 0.036 0.259 0.030 0.01 0.14 130 12,302 16,384 341 341 11,961 0.27 468.87 75 1125 18.75 0.3 0.027 0.255 0.022 0.00 0.11 97 12,058 16,272 339 339 11,719 0.27 468.85 76 1140 19.00 0.2 0.018 0.252 0.015 0.00 0.07 65 11,784 16,146 336 336 11,447 0.26 468.83 77 1155 19.25 0.3 0.027 0.248 0.022 0.00 0.11 97 11,545 16,036 334 334 11,211 0.26 468.81 78 1170 19.50 0.4 0.036 0.245 0.030 0.01 0.14 130 11,340 15,942 332 332 11,008 0.25 468.80 79 1185 19.75 0.3 0.027 0.241 0.022 0.00 0.11 97 11,105 15,834 330 330 10,775 0.25 468.78 80 1200 20.00 0.2 0.018 0.238 0.015 0.00 0.07 65 10,840 15,712 327 327 10,513 0.24 468.76 81 1215 20.25 0.3 0.027 0.235 0.022 0.00 0.11 97 10,610 15,606 325 325 10,285 0.24 468.75 82 1230 20.50 0.3 0.027 0.232 0.022 0.00 0.11 97 10,382 15,501 323 323 10,059 0.23 468.73 83 1245 20.75 0.3 0.027 0.229 0.022 0.00 0.11 97 10,156 15,398 321 321 9,836 0.23 468.71 84 1260 21.00 0.2 0.018 0.226 0.015 0.00 0.07 65 9,900 15,280 318 318 9,582 0.22 468.70 85 1275 21.25 0.3 0.027 0.224 0.022 0.00 0.11 97 9,679 15,178 316 316 9,363 0.21 468.68 86 1290 21.50 0.2 0.018 0.221 0.015 0.00 0.07 65 9,428 15,063 314 314 9,114 0.21 468.66 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 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)83.97%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 THE WAVE 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 9,211 14,963 312 312 8,899 0.20 468.65 88 1320 22.00 0.2 0.018 0.216 0.015 0.00 0.07 65 8,964 14,850 309 309 8,655 0.20 468.63 89 1335 22.25 0.3 0.027 0.214 0.022 0.00 0.11 97 8,752 14,752 307 307 8,445 0.19 468.61 90 1350 22.50 0.2 0.018 0.212 0.015 0.00 0.07 65 8,510 14,641 305 305 8,205 0.19 468.60 91 1365 22.75 0.2 0.018 0.210 0.015 0.00 0.07 65 8,269 14,530 303 303 7,967 0.18 468.58 92 1380 23.00 0.2 0.018 0.209 0.015 0.00 0.07 65 8,031 14,421 300 300 7,731 0.18 468.56 93 1395 23.25 0.2 0.018 0.207 0.015 0.00 0.07 65 7,796 14,313 298 298 7,498 0.17 468.54 94 1410 23.50 0.2 0.018 0.206 0.015 0.00 0.07 65 7,562 14,206 296 296 7,266 0.17 468.53 95 1425 23.75 0.2 0.018 0.205 0.015 0.00 0.07 65 7,331 14,099 294 294 7,037 0.16 468.51 96 1440 24.00 0.2 0.018 0.204 0.015 0.00 0.07 65 7,102 13,994 292 292 6,811 0.16 468.49 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 169,714 cu-ft 469.02 ft 1.22 cfs 25,589 cu-ft 17.77 cf/min 0.36 in 0.74 acft 32,400 cu-ft 0.32 acft 14,135 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 THE WAVE 2553 ()()2121213 1 AAAAEEV++−= 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 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 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET WORKSHEET PREPARED BY: PROJECT NAME DATE October 21, 2019 THE WAVE PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 BASIN B AMC NUMBER Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:10/21/19 [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) [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 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 [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 [3] AREA - ACRES [4] L-FEET [5] L-MILES 2000 0.379 BASIN B DA-B THE WAVE [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 Plate E-2.1 Page 2 of 13 PROJECT: Job No.: BY:DATE:10/21/19 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. SF - MEDIUM DENSITY SF - HIGH DENSITY LANDSCAPING (24-(T/60))^1.55 + LAND USE COMMERCIAL PAVING/HARDSCAPE WATER FEATURE SF - LOW DENSITY AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM THE WAVE DLS 2553 AMC II Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 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 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Total In Basin in/hr Time Loss Rate Basin Losses THE WAVERCFC & 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 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE 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 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 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE 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 0.32 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 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 0 cu-ft 0.00 cf/min 1.21 in 4.20 acft 182,917 cu-ft 4.20 acft 182,917 cu-ft 140,132 cu-ft 2.14 in 323,050 cu-ft 458.63 ft 75.02 cfs Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 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 THE WAVE 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 10/21/19 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 THE WAVE 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 10/21/19 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 THE WAVE 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 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY 0.00 cf/min 0 cu-ft 1.20 in 4.15 acft 180,867 cu-ft 4.15 acft 180,867 cu-ft 416,643 cu-ft 2.76 in 235,776 cu-ft 458.62 ft 64.49 cfs Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 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 in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE 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 10/21/19 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 in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 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 10/21/19 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 in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 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 0 cu-ft 0.00 cf/min 1.10 in 3.82 acft 166,219 cu-ft 3.82 acft 166,219 cu-ft 4.41 in 665,724 cu-ft 499,505 cu-ft 458.57 ft 13.72 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) 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 THE WAVE 2553 ()()2121213 1 AAAAEEV++−= 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 1.454 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 2.486 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 October 21, 2019 THE WAVE 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:10/21/19 [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)11,504 33,739 57,159 121,665 EFFECTIVE RAIN (in)1.13 1.23 1.21 1.12 FLOOD VOLUME (cu-ft)41,767 45,427 44,943 41,476 (acre-ft)0.96 1.04 1.03 0.95 REQUIRED STORAGE (cu-ft)39,499 39,117 34,972 19,896 (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 THE WAVE [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:10/21/19 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 1.454 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 2.486 0.244 0.1132 DEVELOPED 0.8200 0.2000 SUM 10.191 SUM 0.3110 0.5531 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.155486944 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)=0.3110 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 THE WAVE 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 10/21/19 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 3,272 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 4,408 0.10 452.16 5 25 0.42 5.0 0.86 0.31 0.73 0.55 5.68 1,705 6,113 25,926 180 180 5,933 0.14 452.22 6 30 0.50 5.6 0.97 0.31 0.82 0.66 6.75 2,024 7,958 26,194 182 182 7,776 0.18 452.29 7 35 0.58 6.4 1.11 0.31 0.94 0.79 8.17 2,451 10,226 26,525 184 184 10,042 0.23 452.37 8 40 0.67 8.1 1.40 0.31 1.19 1.09 11.19 3,356 13,398 26,987 187 187 13,211 0.30 452.49 9 45 0.75 13.1 2.26 0.31 1.92 1.95 20.07 6,020 19,231 27,837 193 193 19,038 0.44 452.71 10 50 0.83 34.5 5.96 0.31 5.07 5.65 58.07 17,420 36,457 30,218 210 210 36,247 0.83 453.30 11 55 0.92 6.7 1.16 0.31 0.98 0.85 8.70 2,610 38,858 30,535 212 212 38,646 0.89 453.38 12 60 1.00 3.8 0.66 0.31 0.56 0.35 3.55 1,066 39,711 30,648 213 213 39,499 0.91 453.40 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 53,271 cu-ft SOIL LOSSES 11,504 cu-ft EFFECTIVE RAIN 1.13 in FLOOD VOLUME 0.96 acft FLOOD VOLUME 41,767 cu-ft REQUIRED STORAGE 0.91 REQUIRED STORAGE 39,499 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 THE WAVERCFC & 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 0.23 70 70 25,045 174 70 0 0.00 452.00 2 10 0.17 1.3 0.33 0.31 0.28 0.02 0.23 70 70 25,045 174 70 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 25,076 174 174 109 0.00 452.00 6 30 0.50 1.8 0.46 0.31 0.39 0.15 1.55 466 576 25,119 174 174 401 0.01 452.01 7 35 0.58 1.5 0.39 0.31 0.33 0.07 0.76 229 630 25,127 174 174 456 0.01 452.02 8 40 0.67 1.8 0.46 0.31 0.39 0.15 1.55 466 922 25,169 175 175 747 0.02 452.03 9 45 0.75 1.8 0.46 0.31 0.39 0.15 1.55 466 1,213 25,212 175 175 1,038 0.02 452.04 10 50 0.83 1.5 0.39 0.31 0.33 0.07 0.76 229 1,267 25,220 175 175 1,092 0.03 452.04 11 55 0.92 1.6 0.41 0.31 0.35 0.10 1.03 308 1,400 25,239 175 175 1,225 0.03 452.05 12 60 1.00 1.8 0.46 0.31 0.39 0.15 1.55 466 1,691 25,281 176 176 1,516 0.03 452.06 13 65 1.08 2.2 0.56 0.31 0.48 0.25 2.61 783 2,299 25,370 176 176 2,122 0.05 452.08 14 70 1.17 2.2 0.56 0.31 0.48 0.25 2.61 783 2,905 25,458 177 177 2,729 0.06 452.10 15 75 1.25 2.2 0.56 0.31 0.48 0.25 2.61 783 3,512 25,547 177 177 3,334 0.08 452.12 16 80 1.33 2.0 0.51 0.31 0.44 0.20 2.08 625 3,959 25,612 178 178 3,781 0.09 452.14 17 85 1.42 2.6 0.67 0.31 0.57 0.36 3.67 1,100 4,881 25,746 179 179 4,702 0.11 452.17 18 90 1.50 2.7 0.69 0.31 0.59 0.38 3.93 1,179 5,881 25,892 180 180 5,701 0.13 452.21 19 95 1.58 2.4 0.62 0.31 0.52 0.31 3.14 941 6,642 26,003 181 181 6,462 0.15 452.24 20 100 1.67 2.7 0.69 0.31 0.59 0.38 3.93 1,179 7,640 26,148 182 182 7,459 0.17 452.28 21 105 1.75 3.3 0.85 0.31 0.72 0.54 5.51 1,654 9,113 26,363 183 183 8,930 0.20 452.33 22 110 1.83 3.1 0.80 0.31 0.68 0.49 4.98 1,495 10,425 26,554 184 184 10,241 0.24 452.38 23 115 1.92 2.9 0.74 0.31 0.63 0.43 4.46 1,337 11,578 26,722 186 186 11,392 0.26 452.42 24 120 2.00 3.0 0.77 0.31 0.65 0.46 4.72 1,416 12,809 26,901 187 187 12,622 0.29 452.47 25 125 2.08 3.1 0.80 0.31 0.68 0.49 4.98 1,495 14,117 27,092 188 188 13,929 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 THE WAVE 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 THE WAVE HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 1.08 0.31 0.92 0.77 7.89 2,366 16,295 27,409 190 190 16,105 0.37 452.60 27 135 2.25 5.0 1.28 0.31 1.09 0.97 10.00 3,000 19,105 27,818 193 193 18,911 0.43 452.70 28 140 2.33 3.5 0.90 0.31 0.76 0.59 6.04 1,812 20,724 28,054 195 195 20,529 0.47 452.76 29 145 2.42 6.8 1.75 0.31 1.48 1.44 14.75 4,425 24,953 28,670 199 199 24,754 0.57 452.92 30 150 2.50 7.3 1.87 0.31 1.59 1.56 16.07 4,820 29,575 29,308 204 204 29,371 0.67 453.08 31 155 2.58 8.2 2.11 0.31 1.79 1.79 18.44 5,533 34,904 30,013 208 208 34,696 0.80 453.25 32 160 2.67 5.9 1.52 0.31 1.29 1.20 12.37 3,712 38,408 30,476 212 212 38,196 0.88 453.36 33 165 2.75 2.0 0.51 0.31 0.44 0.20 2.08 625 38,821 30,530 212 212 38,609 0.89 453.38 34 170 2.83 1.8 0.46 0.31 0.39 0.15 1.55 466 39,075 30,564 212 212 38,863 0.89 453.38 35 175 2.92 1.8 0.46 0.31 0.39 0.15 1.55 466 39,329 30,597 212 212 39,117 0.90 453.39 36 180 3.00 0.6 0.15 0.31 0.13 0.02 0.24 71 39,188 30,579 212 212 38,976 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 33,739 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 45,427 cu-ft 0.90 acft 39,117 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 10/21/19 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 THE WAVE 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 10/21/19 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 THE WAVE 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 0.55 164 164 25,059 174 164 0 0.00 452.00 39 195 3.25 1.1 0.36 0.31 0.31 0.05 0.55 164 164 25,059 174 164 0 0.00 452.00 40 200 3.33 1.1 0.36 0.31 0.31 0.05 0.55 164 164 25,059 174 164 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 92 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 25,246 175 175 1,276 0.03 452.05 46 230 3.83 1.5 0.50 0.31 0.42 0.19 1.91 573 1,849 25,304 176 176 1,673 0.04 452.06 47 235 3.92 1.6 0.53 0.31 0.45 0.22 2.25 675 2,348 25,377 176 176 2,172 0.05 452.08 48 240 4.00 1.6 0.53 0.31 0.45 0.22 2.25 675 2,847 25,450 177 177 2,670 0.06 452.10 49 245 4.08 1.7 0.56 0.31 0.48 0.25 2.59 777 3,447 25,537 177 177 3,270 0.08 452.12 50 250 4.17 1.8 0.60 0.31 0.51 0.29 2.93 879 4,149 25,639 178 178 3,971 0.09 452.15 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 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 THE WAVE 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 4,953 25,757 179 179 4,774 0.11 452.18 52 260 4.33 2.0 0.66 0.31 0.56 0.35 3.61 1,083 5,857 25,888 180 180 5,677 0.13 452.21 53 265 4.42 2.1 0.70 0.31 0.59 0.38 3.95 1,185 6,863 26,035 181 181 6,682 0.15 452.25 54 270 4.50 2.1 0.70 0.31 0.59 0.38 3.95 1,185 7,867 26,181 182 182 7,686 0.18 452.28 55 275 4.58 2.2 0.73 0.31 0.62 0.42 4.29 1,288 8,973 26,342 183 183 8,790 0.20 452.33 56 280 4.67 2.3 0.76 0.31 0.65 0.45 4.63 1,390 10,180 26,518 184 184 9,996 0.23 452.37 57 285 4.75 2.4 0.79 0.31 0.68 0.48 4.97 1,492 11,488 26,709 185 185 11,302 0.26 452.42 58 290 4.83 2.4 0.79 0.31 0.68 0.48 4.97 1,492 12,794 26,899 187 187 12,607 0.29 452.47 59 295 4.92 2.5 0.83 0.31 0.70 0.52 5.31 1,594 14,201 27,104 188 188 14,013 0.32 452.52 60 300 5.00 2.6 0.86 0.31 0.73 0.55 5.65 1,696 15,709 27,324 190 190 15,519 0.36 452.58 61 305 5.08 3.1 1.03 0.31 0.87 0.72 7.35 2,206 17,725 27,617 192 192 17,534 0.40 452.65 62 310 5.17 3.6 1.19 0.31 1.01 0.88 9.06 2,717 20,251 27,985 194 194 20,056 0.46 452.74 63 315 5.25 3.9 1.29 0.31 1.10 0.98 10.08 3,023 23,080 28,397 197 197 22,882 0.53 452.85 64 320 5.33 4.2 1.39 0.31 1.18 1.08 11.10 3,330 26,212 28,854 200 200 26,012 0.60 452.96 65 325 5.42 4.7 1.56 0.31 1.32 1.25 12.80 3,840 29,852 29,345 204 204 29,648 0.68 453.09 66 330 5.50 5.6 1.85 0.31 1.58 1.54 15.86 4,759 34,407 29,947 208 208 34,199 0.79 453.23 67 335 5.58 1.9 0.63 0.31 0.53 0.32 3.27 981 35,180 30,049 209 209 34,972 0.80 453.26 68 340 5.67 0.9 0.30 0.31 0.25 0.04 0.46 138 35,110 30,040 209 209 34,901 0.80 453.26 69 345 5.75 0.6 0.20 0.31 0.17 0.03 0.31 92 34,993 30,024 209 209 34,784 0.80 453.25 70 350 5.83 0.5 0.17 0.31 0.14 0.02 0.26 77 34,861 30,007 208 208 34,652 0.80 453.25 71 355 5.92 0.3 0.10 0.31 0.08 0.01 0.15 46 34,698 29,985 208 208 34,490 0.79 453.24 72 360 6.00 0.2 0.07 0.31 0.06 0.01 0.10 31 34,521 29,962 208 208 34,313 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 57,159 cu-ft 453.26 ft 15.86 cfs 29.53 cf/min 10,630 cu-ft 1.21 in 1.03 acft 44,943 cu-ft 0.80 acft 34,972 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 10/21/19 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 0.458 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 0.360 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 0.60 537 537 25,113 523 523 14 0.00 452.00 41 615 10.25 1.5 0.265 0.325 0.225 0.04 0.41 367 381 25,091 523 381 0 0.00 452.00 42 630 10.50 1.5 0.265 0.321 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 THE WAVE 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 10/21/19 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 THE WAVE 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 1,407 1,407 25,240 526 526 881 0.02 452.03 50 750 12.50 2.6 0.459 0.285 0.390 0.17 1.79 1,610 2,492 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 1,976 3,939 25,609 534 534 3,406 0.08 452.13 52 780 13.00 2.9 0.512 0.276 0.435 0.24 2.42 2,178 5,584 25,848 539 539 5,045 0.12 452.19 53 795 13.25 3.4 0.600 0.272 0.510 0.33 3.37 3,033 8,078 26,212 546 546 7,532 0.17 452.28 54 810 13.50 3.4 0.600 0.268 0.510 0.33 3.41 3,071 10,603 26,580 554 554 10,049 0.23 452.37 55 825 13.75 2.3 0.406 0.264 0.345 0.14 1.46 1,314 11,363 26,690 556 556 10,807 0.25 452.40 56 840 14.00 2.3 0.406 0.260 0.345 0.15 1.50 1,351 12,158 26,806 558 558 11,600 0.27 452.43 57 855 14.25 2.7 0.476 0.256 0.405 0.22 2.27 2,040 13,640 27,022 563 563 13,077 0.30 452.48 58 870 14.50 2.6 0.459 0.252 0.390 0.21 2.13 1,913 14,990 27,219 567 567 14,423 0.33 452.53 59 885 14.75 2.6 0.459 0.248 0.390 0.21 2.17 1,949 16,372 27,420 571 571 15,801 0.36 452.59 60 900 15.00 2.5 0.441 0.244 0.375 0.20 2.02 1,821 17,621 27,602 575 575 17,046 0.39 452.63 61 915 15.25 2.4 0.423 0.240 0.360 0.18 1.88 1,692 18,738 27,765 578 578 18,160 0.42 452.67 62 930 15.50 2.3 0.406 0.237 0.345 0.17 1.74 1,563 19,723 27,908 581 581 19,141 0.44 452.71 63 945 15.75 1.9 0.335 0.233 0.285 0.10 1.05 944 20,085 27,961 583 583 19,503 0.45 452.72 64 960 16.00 1.9 0.335 0.230 0.285 0.11 1.09 977 20,480 28,019 584 584 19,896 0.46 452.74 65 975 16.25 0.4 0.071 0.226 0.060 0.01 0.11 98 19,994 27,948 582 582 19,412 0.45 452.72 66 990 16.50 0.4 0.071 0.223 0.060 0.01 0.11 98 19,509 27,877 581 581 18,929 0.43 452.70 67 1005 16.75 0.3 0.053 0.219 0.045 0.01 0.08 73 19,002 27,803 579 579 18,423 0.42 452.68 68 1020 17.00 0.3 0.053 0.216 0.045 0.01 0.08 73 18,496 27,730 578 578 17,919 0.41 452.66 69 1035 17.25 0.5 0.088 0.213 0.075 0.01 0.14 122 18,041 27,663 576 576 17,465 0.40 452.65 70 1050 17.50 0.5 0.088 0.209 0.075 0.01 0.14 122 17,587 27,597 575 575 17,012 0.39 452.63 71 1065 17.75 0.5 0.088 0.206 0.075 0.01 0.14 122 17,134 27,531 574 574 16,561 0.38 452.61 72 1080 18.00 0.4 0.071 0.203 0.060 0.01 0.11 98 16,659 27,462 572 572 16,087 0.37 452.60 73 1095 18.25 0.4 0.071 0.200 0.060 0.01 0.11 98 16,184 27,393 571 571 15,614 0.36 452.58 74 1110 18.50 0.4 0.071 0.197 0.060 0.01 0.11 98 15,712 27,324 569 569 15,142 0.35 452.56 75 1125 18.75 0.3 0.053 0.195 0.045 0.01 0.08 73 15,216 27,252 568 568 14,648 0.34 452.54 76 1140 19.00 0.2 0.035 0.192 0.030 0.01 0.05 49 14,697 27,176 566 566 14,131 0.32 452.52 77 1155 19.25 0.3 0.053 0.189 0.045 0.01 0.08 73 14,204 27,104 565 565 13,640 0.31 452.51 78 1170 19.50 0.4 0.071 0.186 0.060 0.01 0.11 98 13,737 27,036 563 563 13,174 0.30 452.49 79 1185 19.75 0.3 0.053 0.184 0.045 0.01 0.08 73 13,248 26,965 562 562 12,686 0.29 452.47 80 1200 20.00 0.2 0.035 0.181 0.030 0.01 0.05 49 12,735 26,890 560 560 12,175 0.28 452.45 81 1215 20.25 0.3 0.053 0.179 0.045 0.01 0.08 73 12,248 26,819 559 559 11,689 0.27 452.43 82 1230 20.50 0.3 0.053 0.177 0.045 0.01 0.08 73 11,763 26,749 557 557 11,205 0.26 452.42 83 1245 20.75 0.3 0.053 0.174 0.045 0.01 0.08 73 11,279 26,678 556 556 10,723 0.25 452.40 84 1260 21.00 0.2 0.035 0.172 0.030 0.01 0.05 49 10,772 26,604 554 554 10,218 0.23 452.38 85 1275 21.25 0.3 0.053 0.170 0.045 0.01 0.08 73 10,291 26,534 553 553 9,738 0.22 452.36 86 1290 21.50 0.2 0.035 0.168 0.030 0.01 0.05 49 9,787 26,461 551 551 9,236 0.21 452.34 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 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 THE WAVE 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 9,309 26,391 550 550 8,760 0.20 452.32 88 1320 22.00 0.2 0.035 0.165 0.030 0.01 0.05 49 8,809 26,318 548 548 8,260 0.19 452.31 89 1335 22.25 0.3 0.053 0.163 0.045 0.01 0.08 73 8,334 26,249 547 547 7,787 0.18 452.29 90 1350 22.50 0.2 0.035 0.162 0.030 0.01 0.05 49 7,836 26,177 545 545 7,290 0.17 452.27 91 1365 22.75 0.2 0.035 0.160 0.030 0.01 0.05 49 7,339 26,104 544 544 6,795 0.16 452.25 92 1380 23.00 0.2 0.035 0.159 0.030 0.01 0.05 49 6,844 26,032 542 542 6,302 0.14 452.23 93 1395 23.25 0.2 0.035 0.158 0.030 0.01 0.05 49 6,351 25,960 541 541 5,810 0.13 452.22 94 1410 23.50 0.2 0.035 0.157 0.030 0.01 0.05 49 5,859 25,889 539 539 5,320 0.12 452.20 95 1425 23.75 0.2 0.035 0.156 0.030 0.01 0.05 49 5,369 25,817 538 538 4,831 0.11 452.18 96 1440 24.00 0.2 0.035 0.156 0.030 0.01 0.05 49 4,880 25,746 536 536 4,343 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 121,665 cu-ft 452.74 ft 3.41 cfs 37,133 cu-ft 25.79 cf/min 1.12 in 0.95 acft 41,476 cu-ft 0.46 acft 19,896 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 THE WAVE 2553 ()()2121213 1 AAAAEEV++−= 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 2.408 D 56 0.51 1.00 1 B COMMERCIAL 4.712 D 56 0.51 0.90 6 B SF - HIGH DENSITY 8.129 D 56 0.51 0.50 9 B LANDSCAPING 11.404 D 56 0.51 0.10 3 B WATER FEATURE 2.323 D 56 0.51 1.00 780 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 October 21, 2019 THE WAVE PROJECT NUMBER CONCENTRATION POINT DESIGNATION 2553 BASIN D AMC NUMBER Data Input Sheet Page 1 of 13 PROJECT: Job No.: BY:DATE:10/21/19 [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)151,464 225,092 290,306 463,858 SOIL LOSSES (cu-ft)30,023 88,317 157,214 331,715 EFFECTIVE RAIN (in)1.15 1.30 1.27 1.26 FLOOD VOLUME (cu-ft)121,441 136,776 133,092 132,144 (acre-ft)2.79 3.14 3.06 3.03 REQUIRED STORAGE (cu-ft)121,441 136,776 133,092 132,144 (acre-ft)2.79 3.14 3.06 3.03 FACTOR OF SAFETY 1.39 1.23 1.27 1.28 STORAGE PROVIDED (cu-ft) (acre-ft) PEAK FLOW (cfs)n/a 53.19 45.85 10.34 MAXIMUM WSEL (ft)452.12 452.24 452.21 452.20 DEPTH (ft)1.12 1.24 1.21 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 THE WAVE [10] H-FEET [9] ELEVATION OF CONCENTRATION POINT 28.976 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:10/21/19 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 2.408 0.083 0.0042 DEVELOPED 0.1000 0.0083 B 56 0.51 90%0.10 4.712 0.163 0.0158 DEVELOPED 0.1800 0.0293 B 56 0.51 50%0.28 8.129 0.281 0.0787 DEVELOPED 0.5000 0.1403 B 56 0.51 10%0.46 11.404 0.394 0.1827 DEVELOPED 0.8200 0.3227 B 56 0.51 100%0.05 2.323 0.080 0.0041 DEVELOPED 0.1000 0.0080 SUM 28.976 SUM 0.2854 0.5086 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.142715604 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00264 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55+Fm =0.00264 0.14 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.2854 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. WATER FEATURE (24-(T/60))^1.55 + LAND USE PAVING/HARDSCAPE COMMERCIAL SF - HIGH DENSITY LANDSCAPING AVERAGE ADJUSTED LOSS RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM THE WAVE DLS 2553 AMC II Plate E-2.1 Page 3 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 28.98 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 0.29 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 0.29 0.53 0.34 9.84 2,951 2,951 101,502 0 0 2,951 0.07 451.03 2 10 0.17 4.2 0.73 0.29 0.62 0.44 12.87 3,860 6,810 101,911 0 0 6,810 0.16 451.06 3 15 0.25 4.4 0.76 0.29 0.65 0.47 13.88 4,163 10,973 102,352 0 0 10,973 0.25 451.10 4 20 0.33 4.6 0.79 0.29 0.68 0.51 14.88 4,465 15,438 102,824 0 0 15,438 0.35 451.14 5 25 0.42 5.0 0.86 0.29 0.73 0.58 16.90 5,071 20,510 103,361 0 0 20,510 0.47 451.19 6 30 0.50 5.6 0.97 0.29 0.82 0.68 19.93 5,980 26,490 103,994 0 0 26,490 0.61 451.25 7 35 0.58 6.4 1.11 0.29 0.94 0.82 23.97 7,192 33,682 104,756 0 0 33,682 0.77 451.32 8 40 0.67 8.1 1.40 0.29 1.19 1.11 32.56 9,767 43,448 105,789 0 0 43,448 1.00 451.41 9 45 0.75 13.1 2.26 0.29 1.92 1.98 57.80 17,340 60,788 107,625 0 0 60,788 1.40 451.57 10 50 0.83 34.5 5.96 0.29 5.07 5.68 165.84 49,753 110,541 113,892 0 0 110,541 2.54 452.03 11 55 0.92 6.7 1.16 0.29 0.98 0.87 25.49 7,646 118,188 116,741 0 0 118,188 2.71 452.09 12 60 1.00 3.8 0.66 0.29 0.56 0.37 10.85 3,254 121,441 117,953 0 0 121,441 2.79 452.12 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 151,464 cu-ft SOIL LOSSES 30,023 cu-ft EFFECTIVE RAIN 1.15 in FLOOD VOLUME 2.79 acft FLOOD VOLUME 121,441 cu-ft REQUIRED STORAGE 2.79 REQUIRED STORAGE 121,441 cu-ft MAX WSEL 452.12 ft PEAK FLOW RATE 165.84 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 THE WAVERCFC & 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 28.98 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)0.29 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 0.29 0.28 0.05 1.41 424 424 101,235 0 0 424 0.01 451.00 2 10 0.17 1.3 0.33 0.29 0.28 0.05 1.41 424 849 101,280 0 0 849 0.02 451.01 3 15 0.25 1.1 0.28 0.29 0.24 0.04 1.24 371 1,220 101,319 0 0 1,220 0.03 451.01 4 20 0.33 1.5 0.39 0.29 0.33 0.10 2.92 875 2,095 101,412 0 0 2,095 0.05 451.02 5 25 0.42 1.5 0.39 0.29 0.33 0.10 2.92 875 2,969 101,504 0 0 2,969 0.07 451.03 6 30 0.50 1.8 0.46 0.29 0.39 0.18 5.17 1,550 4,519 101,668 0 0 4,519 0.10 451.04 7 35 0.58 1.5 0.39 0.29 0.33 0.10 2.92 875 5,393 101,761 0 0 5,393 0.12 451.05 8 40 0.67 1.8 0.46 0.29 0.39 0.18 5.17 1,550 6,943 101,925 0 0 6,943 0.16 451.07 9 45 0.75 1.8 0.46 0.29 0.39 0.18 5.17 1,550 8,493 102,089 0 0 8,493 0.19 451.08 10 50 0.83 1.5 0.39 0.29 0.33 0.10 2.92 875 9,367 102,182 0 0 9,367 0.22 451.09 11 55 0.92 1.6 0.41 0.29 0.35 0.13 3.67 1,100 10,467 102,298 0 0 10,467 0.24 451.10 12 60 1.00 1.8 0.46 0.29 0.39 0.18 5.17 1,550 12,017 102,462 0 0 12,017 0.28 451.11 13 65 1.08 2.2 0.56 0.29 0.48 0.28 8.17 2,450 14,467 102,721 0 0 14,467 0.33 451.14 14 70 1.17 2.2 0.56 0.29 0.48 0.28 8.17 2,450 16,917 102,981 0 0 16,917 0.39 451.16 15 75 1.25 2.2 0.56 0.29 0.48 0.28 8.17 2,450 19,367 103,240 0 0 19,367 0.44 451.18 16 80 1.33 2.0 0.51 0.29 0.44 0.23 6.67 2,000 21,367 103,452 0 0 21,367 0.49 451.20 17 85 1.42 2.6 0.67 0.29 0.57 0.38 11.17 3,351 24,718 103,807 0 0 24,718 0.57 451.23 18 90 1.50 2.7 0.69 0.29 0.59 0.41 11.92 3,576 28,293 104,185 0 0 28,293 0.65 451.26 19 95 1.58 2.4 0.62 0.29 0.52 0.33 9.67 2,900 31,194 104,492 0 0 31,194 0.72 451.29 20 100 1.67 2.7 0.69 0.29 0.59 0.41 11.92 3,576 34,769 104,871 0 0 34,769 0.80 451.33 21 105 1.75 3.3 0.85 0.29 0.72 0.56 16.42 4,926 39,695 105,392 0 0 39,695 0.91 451.37 22 110 1.83 3.1 0.80 0.29 0.68 0.51 14.92 4,476 44,171 105,866 0 0 44,171 1.01 451.41 23 115 1.92 2.9 0.74 0.29 0.63 0.46 13.42 4,026 48,197 106,292 0 0 48,197 1.11 451.45 24 120 2.00 3.0 0.77 0.29 0.65 0.48 14.17 4,251 52,448 106,742 0 0 52,448 1.20 451.49 25 125 2.08 3.1 0.80 0.29 0.68 0.51 14.92 4,476 56,924 107,216 0 0 56,924 1.31 451.53 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE 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 28.98 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)0.29 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 THE WAVE 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 0.29 0.92 0.79 23.17 6,952 63,876 107,952 0 0 63,876 1.47 451.60 27 135 2.25 5.0 1.28 0.29 1.09 1.00 29.18 8,753 72,629 108,878 0 0 72,629 1.67 451.68 28 140 2.33 3.5 0.90 0.29 0.76 0.61 17.92 5,376 78,005 109,448 0 0 78,005 1.79 451.73 29 145 2.42 6.8 1.75 0.29 1.48 1.46 42.68 12,804 90,809 110,803 0 0 90,809 2.08 451.85 30 150 2.50 7.3 1.87 0.29 1.59 1.59 46.43 13,930 104,739 112,278 0 0 104,739 2.40 451.98 31 155 2.58 8.2 2.11 0.29 1.79 1.82 53.19 15,956 120,695 117,675 0 0 120,695 2.77 452.11 32 160 2.67 5.9 1.52 0.29 1.29 1.23 35.93 10,779 131,474 121,692 0 0 131,474 3.02 452.20 33 165 2.75 2.0 0.51 0.29 0.44 0.23 6.67 2,000 133,474 122,437 0 0 133,474 3.06 452.22 34 170 2.83 1.8 0.46 0.29 0.39 0.18 5.17 1,550 135,023 123,014 0 0 135,023 3.10 452.23 35 175 2.92 1.8 0.46 0.29 0.39 0.18 5.17 1,550 136,573 123,592 0 0 136,573 3.14 452.24 36 180 3.00 0.6 0.15 0.29 0.13 0.02 0.68 203 136,776 123,667 0 0 136,776 3.14 452.24 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 1.30 in 3.14 acft 136,776 cu-ft 3.14 acft 136,776 cu-ft 88,317 cu-ft 2.14 in 225,092 cu-ft 452.24 ft 53.19 cfs Plate E-2.2 3-Hour Storm Page 6 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 28.98 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)0.29 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 0.29 0.14 0.02 0.73 218 218 101,213 0 0 218 0.00 451.00 2 10 0.17 0.6 0.20 0.29 0.17 0.03 0.87 261 479 101,241 0 0 479 0.01 451.00 3 15 0.25 0.6 0.20 0.29 0.17 0.03 0.87 261 740 101,268 0 0 740 0.02 451.01 4 20 0.33 0.6 0.20 0.29 0.17 0.03 0.87 261 1,002 101,296 0 0 1,002 0.02 451.01 5 25 0.42 0.6 0.20 0.29 0.17 0.03 0.87 261 1,263 101,324 0 0 1,263 0.03 451.01 6 30 0.50 0.7 0.23 0.29 0.20 0.03 1.02 305 1,568 101,356 0 0 1,568 0.04 451.01 7 35 0.58 0.7 0.23 0.29 0.20 0.03 1.02 305 1,872 101,388 0 0 1,872 0.04 451.02 8 40 0.67 0.7 0.23 0.29 0.20 0.03 1.02 305 2,177 101,420 0 0 2,177 0.05 451.02 9 45 0.75 0.7 0.23 0.29 0.20 0.03 1.02 305 2,482 101,453 0 0 2,482 0.06 451.02 10 50 0.83 0.7 0.23 0.29 0.20 0.03 1.02 305 2,787 101,485 0 0 2,787 0.06 451.03 11 55 0.92 0.7 0.23 0.29 0.20 0.03 1.02 305 3,092 101,517 0 0 3,092 0.07 451.03 12 60 1.00 0.8 0.26 0.29 0.23 0.04 1.16 348 3,440 101,554 0 0 3,440 0.08 451.03 13 65 1.08 0.8 0.26 0.29 0.23 0.04 1.16 348 3,788 101,591 0 0 3,788 0.09 451.04 14 70 1.17 0.8 0.26 0.29 0.23 0.04 1.16 348 4,137 101,628 0 0 4,137 0.09 451.04 15 75 1.25 0.8 0.26 0.29 0.23 0.04 1.16 348 4,485 101,665 0 0 4,485 0.10 451.04 16 80 1.33 0.8 0.26 0.29 0.23 0.04 1.16 348 4,834 101,702 0 0 4,834 0.11 451.05 17 85 1.42 0.8 0.26 0.29 0.23 0.04 1.16 348 5,182 101,739 0 0 5,182 0.12 451.05 18 90 1.50 0.8 0.26 0.29 0.23 0.04 1.16 348 5,530 101,775 0 0 5,530 0.13 451.05 19 95 1.58 0.8 0.26 0.29 0.23 0.04 1.16 348 5,879 101,812 0 0 5,879 0.13 451.06 20 100 1.67 0.8 0.26 0.29 0.23 0.04 1.16 348 6,227 101,849 0 0 6,227 0.14 451.06 21 105 1.75 0.8 0.26 0.29 0.23 0.04 1.16 348 6,575 101,886 0 0 6,575 0.15 451.06 22 110 1.83 0.8 0.26 0.29 0.23 0.04 1.16 348 6,924 101,923 0 0 6,924 0.16 451.06 23 115 1.92 0.8 0.26 0.29 0.23 0.04 1.16 348 7,272 101,960 0 0 7,272 0.17 451.07 24 120 2.00 0.9 0.30 0.29 0.25 0.01 0.37 111 7,383 101,972 0 0 7,383 0.17 451.07 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 28.98 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)0.29 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 THE WAVE 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 0.29 0.23 0.04 1.16 348 7,731 102,008 0 0 7,731 0.18 451.07 26 130 2.17 0.9 0.30 0.29 0.25 0.01 0.37 111 7,842 102,020 0 0 7,842 0.18 451.07 27 135 2.25 0.9 0.30 0.29 0.25 0.01 0.37 111 7,953 102,032 0 0 7,953 0.18 451.07 28 140 2.33 0.9 0.30 0.29 0.25 0.01 0.37 111 8,064 102,044 0 0 8,064 0.19 451.08 29 145 2.42 0.9 0.30 0.29 0.25 0.01 0.37 111 8,175 102,055 0 0 8,175 0.19 451.08 30 150 2.50 0.9 0.30 0.29 0.25 0.01 0.37 111 8,286 102,067 0 0 8,286 0.19 451.08 31 155 2.58 0.9 0.30 0.29 0.25 0.01 0.37 111 8,397 102,079 0 0 8,397 0.19 451.08 32 160 2.67 0.9 0.30 0.29 0.25 0.01 0.37 111 8,507 102,091 0 0 8,507 0.20 451.08 33 165 2.75 1.0 0.33 0.29 0.28 0.05 1.34 401 8,909 102,133 0 0 8,909 0.20 451.08 34 170 2.83 1.0 0.33 0.29 0.28 0.05 1.34 401 9,310 102,176 0 0 9,310 0.21 451.09 35 175 2.92 1.0 0.33 0.29 0.28 0.05 1.34 401 9,711 102,218 0 0 9,711 0.22 451.09 36 180 3.00 1.0 0.33 0.29 0.28 0.05 1.34 401 10,112 102,260 0 0 10,112 0.23 451.09 37 185 3.08 1.0 0.33 0.29 0.28 0.05 1.34 401 10,513 102,303 0 0 10,513 0.24 451.10 38 190 3.17 1.1 0.36 0.29 0.31 0.08 2.30 691 11,205 102,376 0 0 11,205 0.26 451.10 39 195 3.25 1.1 0.36 0.29 0.31 0.08 2.30 691 11,896 102,449 0 0 11,896 0.27 451.11 40 200 3.33 1.1 0.36 0.29 0.31 0.08 2.30 691 12,588 102,523 0 0 12,588 0.29 451.12 41 205 3.42 1.2 0.40 0.29 0.34 0.11 3.27 982 13,570 102,626 0 0 13,570 0.31 451.13 42 210 3.50 1.3 0.43 0.29 0.37 0.15 4.24 1,272 14,842 102,761 0 0 14,842 0.34 451.14 43 215 3.58 1.4 0.46 0.29 0.39 0.18 5.21 1,562 16,404 102,927 0 0 16,404 0.38 451.15 44 220 3.67 1.4 0.46 0.29 0.39 0.18 5.21 1,562 17,966 103,092 0 0 17,966 0.41 451.17 45 225 3.75 1.5 0.50 0.29 0.42 0.21 6.18 1,853 19,819 103,288 0 0 19,819 0.45 451.19 46 230 3.83 1.5 0.50 0.29 0.42 0.21 6.18 1,853 21,672 103,484 0 0 21,672 0.50 451.20 47 235 3.92 1.6 0.53 0.29 0.45 0.24 7.14 2,143 23,815 103,711 0 0 23,815 0.55 451.22 48 240 4.00 1.6 0.53 0.29 0.45 0.24 7.14 2,143 25,958 103,938 0 0 25,958 0.60 451.24 49 245 4.08 1.7 0.56 0.29 0.48 0.28 8.11 2,433 28,391 104,195 0 0 28,391 0.65 451.27 50 250 4.17 1.8 0.60 0.29 0.51 0.31 9.08 2,724 31,115 104,484 0 0 31,115 0.71 451.29 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 28.98 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)0.29 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 THE WAVE 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 0.29 0.53 0.34 10.05 3,014 34,129 104,803 0 0 34,129 0.78 451.32 52 260 4.33 2.0 0.66 0.29 0.56 0.38 11.01 3,304 37,433 105,153 0 0 37,433 0.86 451.35 53 265 4.42 2.1 0.70 0.29 0.59 0.41 11.98 3,595 41,028 105,533 0 0 41,028 0.94 451.38 54 270 4.50 2.1 0.70 0.29 0.59 0.41 11.98 3,595 44,622 105,914 0 0 44,622 1.02 451.42 55 275 4.58 2.2 0.73 0.29 0.62 0.44 12.95 3,885 48,507 106,325 0 0 48,507 1.11 451.45 56 280 4.67 2.3 0.76 0.29 0.65 0.48 13.92 4,175 52,682 106,767 0 0 52,682 1.21 451.49 57 285 4.75 2.4 0.79 0.29 0.68 0.51 14.88 4,465 57,148 107,240 0 0 57,148 1.31 451.54 58 290 4.83 2.4 0.79 0.29 0.68 0.51 14.88 4,465 61,613 107,712 0 0 61,613 1.41 451.58 59 295 4.92 2.5 0.83 0.29 0.70 0.54 15.85 4,756 66,369 108,216 0 0 66,369 1.52 451.62 60 300 5.00 2.6 0.86 0.29 0.73 0.58 16.82 5,046 71,415 108,750 0 0 71,415 1.64 451.67 61 305 5.08 3.1 1.03 0.29 0.87 0.74 21.66 6,498 77,912 109,438 0 0 77,912 1.79 451.73 62 310 5.17 3.6 1.19 0.29 1.01 0.91 26.50 7,949 85,862 110,279 0 0 85,862 1.97 451.80 63 315 5.25 3.9 1.29 0.29 1.10 1.01 29.40 8,820 94,682 111,213 0 0 94,682 2.17 451.89 64 320 5.33 4.2 1.39 0.29 1.18 1.11 32.30 9,691 104,373 112,239 0 0 104,373 2.40 451.98 65 325 5.42 4.7 1.56 0.29 1.32 1.27 37.14 11,142 115,515 115,745 0 0 115,515 2.65 452.07 66 330 5.50 5.6 1.85 0.29 1.58 1.57 45.85 13,755 129,270 120,871 0 0 129,270 2.97 452.18 67 335 5.58 1.9 0.63 0.29 0.53 0.34 10.05 3,014 132,284 121,994 0 0 132,284 3.04 452.21 68 340 5.67 0.9 0.30 0.29 0.25 0.01 0.37 111 132,395 122,035 0 0 132,395 3.04 452.21 69 345 5.75 0.6 0.20 0.29 0.17 0.03 0.87 261 132,656 122,132 0 0 132,656 3.05 452.21 70 350 5.83 0.5 0.17 0.29 0.14 0.02 0.73 218 132,874 122,213 0 0 132,874 3.05 452.21 71 355 5.92 0.3 0.10 0.29 0.08 0.01 0.44 131 133,005 122,262 0 0 133,005 3.05 452.21 72 360 6.00 0.2 0.07 0.29 0.06 0.01 0.29 87 133,092 122,295 0 0 133,092 3.06 452.21 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 1.27 in 3.06 acft 133,092 cu-ft 3.06 acft 133,092 cu-ft 290,306 cu-ft 2.76 in 157,214 cu-ft 452.21 ft 45.85 cfs Plate E-2.2 6-Hour Storm Page 9 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 28.98 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 0.00264 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 0.504 0.030 0.01 0.15 139 139 101,205 0 0 139 0.00 451.00 2 30 0.50 0.3 0.053 0.498 0.045 0.01 0.23 209 348 101,227 0 0 348 0.01 451.00 3 45 0.75 0.3 0.053 0.492 0.045 0.01 0.23 209 557 101,249 0 0 557 0.01 451.01 4 60 1.00 0.4 0.071 0.487 0.060 0.01 0.31 278 835 101,278 0 0 835 0.02 451.01 5 75 1.25 0.3 0.053 0.481 0.045 0.01 0.23 209 1,044 101,300 0 0 1,044 0.02 451.01 6 90 1.50 0.3 0.053 0.475 0.045 0.01 0.23 209 1,252 101,323 0 0 1,252 0.03 451.01 7 105 1.75 0.3 0.053 0.469 0.045 0.01 0.23 209 1,461 101,345 0 0 1,461 0.03 451.01 8 120 2.00 0.4 0.071 0.464 0.060 0.01 0.31 278 1,739 101,374 0 0 1,739 0.04 451.02 9 135 2.25 0.4 0.071 0.458 0.060 0.01 0.31 278 2,018 101,404 0 0 2,018 0.05 451.02 10 150 2.50 0.4 0.071 0.453 0.060 0.01 0.31 278 2,296 101,433 0 0 2,296 0.05 451.02 11 165 2.75 0.5 0.088 0.447 0.075 0.01 0.39 348 2,644 101,470 0 0 2,644 0.06 451.02 12 180 3.00 0.5 0.088 0.442 0.075 0.01 0.39 348 2,992 101,507 0 0 2,992 0.07 451.03 13 195 3.25 0.5 0.088 0.436 0.075 0.01 0.39 348 3,340 101,544 0 0 3,340 0.08 451.03 14 210 3.50 0.5 0.088 0.431 0.075 0.01 0.39 348 3,688 101,580 0 0 3,688 0.08 451.03 15 225 3.75 0.5 0.088 0.425 0.075 0.01 0.39 348 4,036 101,617 0 0 4,036 0.09 451.04 16 240 4.00 0.6 0.106 0.420 0.090 0.02 0.46 417 4,453 101,661 0 0 4,453 0.10 451.04 17 255 4.25 0.6 0.106 0.415 0.090 0.02 0.46 417 4,871 101,706 0 0 4,871 0.11 451.05 18 270 4.50 0.7 0.123 0.409 0.105 0.02 0.54 487 5,358 101,757 0 0 5,358 0.12 451.05 19 285 4.75 0.7 0.123 0.404 0.105 0.02 0.54 487 5,845 101,809 0 0 5,845 0.13 451.05 20 300 5.00 0.8 0.141 0.399 0.120 0.02 0.62 557 6,401 101,868 0 0 6,401 0.15 451.06 21 315 5.25 0.6 0.106 0.394 0.090 0.02 0.46 417 6,819 101,912 0 0 6,819 0.16 451.06 22 330 5.50 0.7 0.123 0.389 0.105 0.02 0.54 487 7,306 101,963 0 0 7,306 0.17 451.07 23 345 5.75 0.8 0.141 0.384 0.120 0.02 0.62 557 7,862 102,022 0 0 7,862 0.18 451.07 24 360 6.00 0.8 0.141 0.378 0.120 0.02 0.62 557 8,419 102,081 0 0 8,419 0.19 451.08 25 375 6.25 0.9 0.159 0.373 0.135 0.02 0.70 626 9,045 102,148 0 0 9,045 0.21 451.08 26 390 6.50 0.9 0.159 0.368 0.135 0.02 0.70 626 9,671 102,214 0 0 9,671 0.22 451.09 27 405 6.75 1.0 0.176 0.363 0.150 0.03 0.77 696 10,367 102,287 0 0 10,367 0.24 451.10 28 420 7.00 1.0 0.176 0.359 0.150 0.03 0.77 696 11,063 102,361 0 0 11,063 0.25 451.10 29 435 7.25 1.0 0.176 0.354 0.150 0.03 0.77 696 11,759 102,435 0 0 11,759 0.27 451.11 30 450 7.50 1.1 0.194 0.349 0.165 0.03 0.85 765 12,524 102,516 0 0 12,524 0.29 451.12 31 465 7.75 1.2 0.212 0.344 0.180 0.03 0.93 835 13,359 102,604 0 0 13,359 0.31 451.13 32 480 8.00 1.3 0.229 0.339 0.195 0.03 1.01 905 14,264 102,700 0 0 14,264 0.33 451.13 33 495 8.25 1.5 0.265 0.335 0.225 0.04 1.16 1,044 15,307 102,810 0 0 15,307 0.35 451.14 34 510 8.50 1.5 0.265 0.330 0.225 0.04 1.16 1,044 16,351 102,921 0 0 16,351 0.38 451.15 35 525 8.75 1.6 0.282 0.325 0.240 0.04 1.24 1,113 17,464 103,039 0 0 17,464 0.40 451.16 36 540 9.00 1.7 0.300 0.321 0.255 0.04 1.31 1,183 18,647 103,164 0 0 18,647 0.43 451.17 37 555 9.25 1.9 0.335 0.316 0.285 0.02 0.55 497 19,144 103,217 0 0 19,144 0.44 451.18 38 570 9.50 2.0 0.353 0.312 0.300 0.04 1.20 1,079 20,224 103,331 0 0 20,224 0.46 451.19 39 585 9.75 2.1 0.370 0.307 0.315 0.06 1.85 1,661 21,884 103,507 0 0 21,884 0.50 451.20 40 600 10.00 2.2 0.388 0.303 0.330 0.09 2.49 2,240 24,125 103,744 0 0 24,125 0.55 451.23 41 615 10.25 1.5 0.265 0.299 0.225 0.04 1.16 1,044 25,168 103,854 0 0 25,168 0.58 451.24 42 630 10.50 1.5 0.265 0.294 0.225 0.04 1.16 1,044 26,212 103,965 0 0 26,212 0.60 451.25 43 645 10.75 2.0 0.353 0.290 0.300 0.06 1.84 1,654 27,866 104,140 0 0 27,866 0.64 451.26 in/hr Total In Basin UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 28.98 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 0.00264 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 THE WAVE HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 44 660 11.00 2.0 0.353 0.286 0.300 0.07 1.96 1,766 29,632 104,327 0 0 29,632 0.68 451.28 45 675 11.25 1.9 0.335 0.281 0.285 0.05 1.57 1,412 31,045 104,476 0 0 31,045 0.71 451.29 46 690 11.50 1.9 0.335 0.277 0.285 0.06 1.69 1,522 32,566 104,637 0 0 32,566 0.75 451.30 47 705 11.75 1.7 0.300 0.273 0.255 0.03 0.78 702 33,268 104,712 0 0 33,268 0.76 451.31 48 720 12.00 1.8 0.318 0.269 0.270 0.05 1.41 1,273 34,540 104,846 0 0 34,540 0.79 451.32 49 735 12.25 2.5 0.441 0.265 0.375 0.18 5.14 4,625 39,166 105,336 0 0 39,166 0.90 451.37 50 750 12.50 2.6 0.459 0.261 0.390 0.20 5.77 5,193 44,359 105,886 0 0 44,359 1.02 451.42 51 765 12.75 2.8 0.494 0.257 0.420 0.24 6.92 6,224 50,583 106,545 0 0 50,583 1.16 451.47 52 780 13.00 2.9 0.512 0.253 0.435 0.26 7.54 6,790 57,374 107,264 0 0 57,374 1.32 451.54 53 795 13.25 3.4 0.600 0.250 0.510 0.35 10.23 9,210 66,584 108,239 0 0 66,584 1.53 451.62 54 810 13.50 3.4 0.600 0.246 0.510 0.35 10.34 9,310 75,893 109,224 0 0 75,893 1.74 451.71 55 825 13.75 2.3 0.406 0.242 0.345 0.16 4.78 4,305 80,199 109,680 0 0 80,199 1.84 451.75 56 840 14.00 2.3 0.406 0.238 0.345 0.17 4.89 4,402 84,601 110,146 0 0 84,601 1.94 451.79 57 855 14.25 2.7 0.476 0.235 0.405 0.24 7.06 6,353 90,954 110,818 0 0 90,954 2.09 451.85 58 870 14.50 2.6 0.459 0.231 0.390 0.23 6.65 5,983 96,937 111,452 0 0 96,937 2.23 451.91 59 885 14.75 2.6 0.459 0.228 0.390 0.23 6.75 6,076 103,014 112,095 0 0 103,014 2.36 451.96 60 900 15.00 2.5 0.441 0.224 0.375 0.22 6.34 5,704 108,718 113,212 0 0 108,718 2.50 452.02 61 915 15.25 2.4 0.423 0.221 0.360 0.20 5.92 5,330 114,048 115,199 0 0 114,048 2.62 452.06 62 930 15.50 2.3 0.406 0.217 0.345 0.19 5.51 4,955 119,004 117,045 0 0 119,004 2.73 452.10 63 945 15.75 1.9 0.335 0.214 0.285 0.12 3.54 3,187 122,191 118,233 0 0 122,191 2.81 452.12 64 960 16.00 1.9 0.335 0.211 0.285 0.12 3.64 3,273 125,464 119,452 0 0 125,464 2.88 452.15 65 975 16.25 0.4 0.071 0.207 0.060 0.01 0.31 278 125,742 119,556 0 0 125,742 2.89 452.15 66 990 16.50 0.4 0.071 0.204 0.060 0.01 0.31 278 126,021 119,660 0 0 126,021 2.89 452.16 67 1005 16.75 0.3 0.053 0.201 0.045 0.01 0.23 209 126,229 119,737 0 0 126,229 2.90 452.16 68 1020 17.00 0.3 0.053 0.198 0.045 0.01 0.23 209 126,438 119,815 0 0 126,438 2.90 452.16 69 1035 17.25 0.5 0.088 0.195 0.075 0.01 0.39 348 126,786 119,945 0 0 126,786 2.91 452.16 70 1050 17.50 0.5 0.088 0.192 0.075 0.01 0.39 348 127,134 120,075 0 0 127,134 2.92 452.16 71 1065 17.75 0.5 0.088 0.189 0.075 0.01 0.39 348 127,482 120,204 0 0 127,482 2.93 452.17 72 1080 18.00 0.4 0.071 0.187 0.060 0.01 0.31 278 127,760 120,308 0 0 127,760 2.93 452.17 73 1095 18.25 0.4 0.071 0.184 0.060 0.01 0.31 278 128,038 120,412 0 0 128,038 2.94 452.17 74 1110 18.50 0.4 0.071 0.181 0.060 0.01 0.31 278 128,317 120,515 0 0 128,317 2.95 452.17 75 1125 18.75 0.3 0.053 0.179 0.045 0.01 0.23 209 128,525 120,593 0 0 128,525 2.95 452.18 76 1140 19.00 0.2 0.035 0.176 0.030 0.01 0.15 139 128,665 120,645 0 0 128,665 2.95 452.18 77 1155 19.25 0.3 0.053 0.174 0.045 0.01 0.23 209 128,873 120,723 0 0 128,873 2.96 452.18 78 1170 19.50 0.4 0.071 0.171 0.060 0.01 0.31 278 129,152 120,826 0 0 129,152 2.96 452.18 79 1185 19.75 0.3 0.053 0.169 0.045 0.01 0.23 209 129,360 120,904 0 0 129,360 2.97 452.18 80 1200 20.00 0.2 0.035 0.166 0.030 0.01 0.15 139 129,500 120,956 0 0 129,500 2.97 452.18 81 1215 20.25 0.3 0.053 0.164 0.045 0.01 0.23 209 129,708 121,034 0 0 129,708 2.98 452.19 82 1230 20.50 0.3 0.053 0.162 0.045 0.01 0.23 209 129,917 121,112 0 0 129,917 2.98 452.19 83 1245 20.75 0.3 0.053 0.160 0.045 0.01 0.23 209 130,126 121,189 0 0 130,126 2.99 452.19 84 1260 21.00 0.2 0.035 0.158 0.030 0.01 0.15 139 130,265 121,241 0 0 130,265 2.99 452.19 85 1275 21.25 0.3 0.053 0.156 0.045 0.01 0.23 209 130,474 121,319 0 0 130,474 3.00 452.19 86 1290 21.50 0.2 0.035 0.155 0.030 0.01 0.15 139 130,613 121,371 0 0 130,613 3.00 452.19 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 28.98 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 0.00264 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 THE WAVE HYDROLOGY SHORTCUT METHOD MANUAL 24-HOUR STORM Basin Losses 87 1305 21.75 0.3 0.053 0.153 0.045 0.01 0.23 209 130,822 121,449 0 0 130,822 3.00 452.19 88 1320 22.00 0.2 0.035 0.151 0.030 0.01 0.15 139 130,961 121,500 0 0 130,961 3.01 452.20 89 1335 22.25 0.3 0.053 0.150 0.045 0.01 0.23 209 131,169 121,578 0 0 131,169 3.01 452.20 90 1350 22.50 0.2 0.035 0.148 0.030 0.01 0.15 139 131,309 121,630 0 0 131,309 3.01 452.20 91 1365 22.75 0.2 0.035 0.147 0.030 0.01 0.15 139 131,448 121,682 0 0 131,448 3.02 452.20 92 1380 23.00 0.2 0.035 0.146 0.030 0.01 0.15 139 131,587 121,734 0 0 131,587 3.02 452.20 93 1395 23.25 0.2 0.035 0.145 0.030 0.01 0.15 139 131,726 121,786 0 0 131,726 3.02 452.20 94 1410 23.50 0.2 0.035 0.144 0.030 0.01 0.15 139 131,865 121,838 0 0 131,865 3.03 452.20 95 1425 23.75 0.2 0.035 0.143 0.030 0.01 0.15 139 132,004 121,889 0 0 132,004 3.03 452.20 96 1440 24.00 0.2 0.035 0.143 0.030 0.01 0.15 139 132,144 121,941 0 0 132,144 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 1.26 in 3.03 acft 132,144 cu-ft 3.03 acft 132,144 cu-ft 4.41 in 463,858 cu-ft 331,715 cu-ft 452.20 ft 10.34 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 THE WAVE 2553 ()()2121213 1 AAAAEEV++−= 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 1.749 D 56 0.51 1.00 4 B SF - LOW DENSITY 49.206 D 56 0.51 0.30 6 B SF - HIGH DENSITY 4.271 D 56 0.51 0.50 9 B LANDSCAPING 7.677 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 October 21, 2019 THE WAVE 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:10/21/19 [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)328,808 488,645 630,215 1,006,974 SOIL LOSSES (cu-ft)84,106 242,142 379,405 783,505 EFFECTIVE RAIN (in)1.07 1.08 1.10 0.98 FLOOD VOLUME (cu-ft)244,702 246,503 250,810 223,470 (acre-ft)5.62 5.66 5.76 5.13 REQUIRED STORAGE (cu-ft)225,760 198,059 176,226 61,654 (acre-ft)5.18 4.55 4.05 1.42 FACTOR OF SAFETY 5.39 6.14 6.90 19.73 STORAGE PROVIDED (cu-ft) (acre-ft) PEAK FLOW (cfs)n/a 110.20 94.28 17.93 MAXIMUM WSEL (ft)442.99 442.87 442.77 442.27 DEPTH (ft)0.99 0.87 0.77 0.27 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 THE WAVE [10] H-FEET [9] ELEVATION OF CONCENTRATION POINT 62.903 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:10/21/19 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 1.749 0.028 0.0014 DEVELOPED 0.1000 0.0028 B 56 0.51 30%0.37 49.206 0.782 0.2912 DEVELOPED 0.6600 0.5163 B 56 0.51 50%0.28 4.271 0.068 0.0190 DEVELOPED 0.5000 0.0339 B 56 0.51 10%0.46 7.677 0.122 0.0566 DEVELOPED 0.8200 0.1001 SUM 62.903 SUM 0.3683 0.6531 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.184168513 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)=0.3683 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 THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 62.90 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 16.09 4,828 4,828 224,712 1,561 1,561 3,268 0.08 442.01 2 10 0.17 4.2 0.73 0.37 0.62 0.36 22.67 6,801 10,069 224,883 1,562 1,562 8,507 0.20 442.04 3 15 0.25 4.4 0.76 0.37 0.65 0.39 24.86 7,459 15,966 225,074 1,563 1,563 14,403 0.33 442.06 4 20 0.33 4.6 0.79 0.37 0.68 0.43 27.05 8,116 22,519 225,288 1,564 1,564 20,955 0.48 442.09 5 25 0.42 5.0 0.86 0.37 0.73 0.50 31.44 9,432 30,386 225,543 1,566 1,566 28,820 0.66 442.13 6 30 0.50 5.6 0.97 0.37 0.82 0.60 38.01 11,404 40,225 225,863 1,568 1,568 38,656 0.89 442.17 7 35 0.58 6.4 1.11 0.37 0.94 0.74 46.78 14,035 52,691 226,269 1,571 1,571 51,120 1.17 442.22 8 40 0.67 8.1 1.40 0.37 1.19 1.03 65.42 19,625 70,744 226,856 1,575 1,575 69,169 1.59 442.30 9 45 0.75 13.1 2.26 0.37 1.92 1.90 120.22 36,065 105,234 227,978 1,583 1,583 103,651 2.38 442.45 10 50 0.83 34.5 5.96 0.37 5.07 5.59 354.77 106,430 210,081 231,389 1,607 1,607 208,474 4.79 442.91 11 55 0.92 6.7 1.16 0.37 0.98 0.79 50.07 15,021 223,495 231,825 1,610 1,610 221,885 5.09 442.97 12 60 1.00 3.8 0.66 0.37 0.56 0.29 18.29 5,486 227,371 231,951 1,611 1,611 225,760 5.18 442.99 TOTAL RAINFALL 1.44 in RAINFALL VOLUME 328,808 cu-ft SOIL LOSSES 84,106 cu-ft EFFECTIVE RAIN 1.07 in FLOOD VOLUME 5.62 acft FLOOD VOLUME 244,702 cu-ft REQUIRED STORAGE 5.18 REQUIRED STORAGE 225,760 cu-ft MAX WSEL 442.99 ft PEAK FLOW RATE 354.77 cfs TOTAL BASIN LOSSES 18,942 cu-ft AVERAGE PERCOLATION RATE 315.70 cf/min THE WAVERCFC & 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 62.90 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 3.18 953 953 224,586 1,560 953 0 0.00 442.00 2 10 0.17 1.3 0.33 0.37 0.28 0.05 3.18 953 953 224,586 1,560 953 0 0.00 442.00 3 15 0.25 1.1 0.28 0.37 0.24 0.04 2.69 806 806 224,581 1,560 806 0 0.00 442.00 4 20 0.33 1.5 0.39 0.37 0.33 0.02 1.07 321 321 224,565 1,559 321 0 0.00 442.00 5 25 0.42 1.5 0.39 0.37 0.33 0.02 1.07 321 321 224,565 1,559 321 0 0.00 442.00 6 30 0.50 1.8 0.46 0.37 0.39 0.09 5.96 1,787 1,787 224,613 1,560 1,560 227 0.01 442.00 7 35 0.58 1.5 0.39 0.37 0.33 0.02 1.07 321 548 224,573 1,560 548 0 0.00 442.00 8 40 0.67 1.8 0.46 0.37 0.39 0.09 5.96 1,787 1,787 224,613 1,560 1,560 227 0.01 442.00 9 45 0.75 1.8 0.46 0.37 0.39 0.09 5.96 1,787 2,014 224,621 1,560 1,560 454 0.01 442.00 10 50 0.83 1.5 0.39 0.37 0.33 0.02 1.07 321 775 224,580 1,560 775 0 0.00 442.00 11 55 0.92 1.6 0.41 0.37 0.35 0.04 2.70 810 810 224,581 1,560 810 0 0.00 442.00 12 60 1.00 1.8 0.46 0.37 0.39 0.09 5.96 1,787 1,787 224,613 1,560 1,560 227 0.01 442.00 13 65 1.08 2.2 0.56 0.37 0.48 0.20 12.47 3,741 3,968 224,684 1,560 1,560 2,408 0.06 442.01 14 70 1.17 2.2 0.56 0.37 0.48 0.20 12.47 3,741 6,149 224,755 1,561 1,561 4,589 0.11 442.02 15 75 1.25 2.2 0.56 0.37 0.48 0.20 12.47 3,741 8,330 224,826 1,561 1,561 6,769 0.16 442.03 16 80 1.33 2.0 0.51 0.37 0.44 0.15 9.21 2,764 9,533 224,865 1,562 1,562 7,971 0.18 442.03 17 85 1.42 2.6 0.67 0.37 0.57 0.30 18.99 5,696 13,667 225,000 1,562 1,562 12,105 0.28 442.05 18 90 1.50 2.7 0.69 0.37 0.59 0.33 20.62 6,185 18,289 225,150 1,564 1,564 16,726 0.38 442.07 19 95 1.58 2.4 0.62 0.37 0.52 0.25 15.73 4,719 21,445 225,253 1,564 1,564 19,880 0.46 442.09 20 100 1.67 2.7 0.69 0.37 0.59 0.33 20.62 6,185 26,065 225,403 1,565 1,565 24,500 0.56 442.11 21 105 1.75 3.3 0.85 0.37 0.72 0.48 30.39 9,116 33,616 225,648 1,567 1,567 32,049 0.74 442.14 22 110 1.83 3.1 0.80 0.37 0.68 0.43 27.13 8,139 40,188 225,862 1,568 1,568 38,620 0.89 442.17 23 115 1.92 2.9 0.74 0.37 0.63 0.38 23.87 7,162 45,782 226,044 1,570 1,570 44,212 1.01 442.19 24 120 2.00 3.0 0.77 0.37 0.65 0.40 25.50 7,651 51,862 226,242 1,571 1,571 50,291 1.15 442.22 25 125 2.08 3.1 0.80 0.37 0.68 0.43 27.13 8,139 58,431 226,456 1,573 1,573 56,858 1.31 442.25 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 THE WAVE HYDROLOGY SHORTCUT METHOD Plate E-2.2 3-Hour Storm Page 5 of 13 PROJECT: Job No.:2553 BY:DLS DATE DRAINAGE AREA-ACRES 62.90 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 THE WAVE HYDROLOGY SHORTCUT METHOD 26 130 2.17 4.2 1.08 0.37 0.92 0.71 45.05 13,514 70,372 226,844 1,575 1,575 68,797 1.58 442.30 27 135 2.25 5.0 1.28 0.37 1.09 0.92 58.08 17,423 86,220 227,360 1,579 1,579 84,641 1.94 442.37 28 140 2.33 3.5 0.90 0.37 0.76 0.53 33.65 10,094 94,735 227,637 1,581 1,581 93,154 2.14 442.41 29 145 2.42 6.8 1.75 0.37 1.48 1.38 87.40 26,219 119,373 228,438 1,586 1,586 117,787 2.70 442.52 30 150 2.50 7.3 1.87 0.37 1.59 1.51 95.54 28,662 146,449 229,319 1,592 1,592 144,857 3.33 442.63 31 155 2.58 8.2 2.11 0.37 1.79 1.74 110.20 33,060 177,917 230,342 1,600 1,600 176,317 4.05 442.77 32 160 2.67 5.9 1.52 0.37 1.29 1.15 72.74 21,821 198,139 231,000 1,604 1,604 196,534 4.51 442.86 33 165 2.75 2.0 0.51 0.37 0.44 0.15 9.21 2,764 199,299 231,038 1,604 1,604 197,694 4.54 442.87 34 170 2.83 1.8 0.46 0.37 0.39 0.09 5.96 1,787 199,481 231,044 1,604 1,604 197,876 4.54 442.87 35 175 2.92 1.8 0.46 0.37 0.39 0.09 5.96 1,787 199,663 231,050 1,605 1,605 198,059 4.55 442.87 36 180 3.00 0.6 0.15 0.37 0.13 0.02 1.47 440 198,499 231,012 1,604 1,604 196,894 4.52 442.86 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 242,142 cu-ft 2.14 in 488,645 cu-ft 442.87 ft 110.20 cfs 49,609 cu-ft 275.61 cf/min 1.08 in 5.66 acft 246,503 cu-ft 4.55 acft 198,059 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 10/21/19 DRAINAGE AREA-ACRES 62.90 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 1.58 473 473 224,570 1,560 473 0 0.00 442.00 2 10 0.17 0.6 0.20 0.37 0.17 0.03 1.89 567 567 224,573 1,560 567 0 0.00 442.00 3 15 0.25 0.6 0.20 0.37 0.17 0.03 1.89 567 567 224,573 1,560 567 0 0.00 442.00 4 20 0.33 0.6 0.20 0.37 0.17 0.03 1.89 567 567 224,573 1,560 567 0 0.00 442.00 5 25 0.42 0.6 0.20 0.37 0.17 0.03 1.89 567 567 224,573 1,560 567 0 0.00 442.00 6 30 0.50 0.7 0.23 0.37 0.20 0.03 2.21 662 662 224,577 1,560 662 0 0.00 442.00 7 35 0.58 0.7 0.23 0.37 0.20 0.03 2.21 662 662 224,577 1,560 662 0 0.00 442.00 8 40 0.67 0.7 0.23 0.37 0.20 0.03 2.21 662 662 224,577 1,560 662 0 0.00 442.00 9 45 0.75 0.7 0.23 0.37 0.20 0.03 2.21 662 662 224,577 1,560 662 0 0.00 442.00 10 50 0.83 0.7 0.23 0.37 0.20 0.03 2.21 662 662 224,577 1,560 662 0 0.00 442.00 11 55 0.92 0.7 0.23 0.37 0.20 0.03 2.21 662 662 224,577 1,560 662 0 0.00 442.00 12 60 1.00 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 13 65 1.08 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 14 70 1.17 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 15 75 1.25 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 16 80 1.33 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 17 85 1.42 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 18 90 1.50 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 19 95 1.58 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 20 100 1.67 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 21 105 1.75 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 22 110 1.83 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 23 115 1.92 0.8 0.26 0.37 0.23 0.04 2.52 756 756 224,580 1,560 756 0 0.00 442.00 24 120 2.00 0.9 0.30 0.37 0.25 0.04 2.84 851 851 224,583 1,560 851 0 0.00 442.00 Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 62.90 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 THE WAVE 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 2.52 756 756 224,580 1,560 756 0 0.00 442.00 26 130 2.17 0.9 0.30 0.37 0.25 0.04 2.84 851 851 224,583 1,560 851 0 0.00 442.00 27 135 2.25 0.9 0.30 0.37 0.25 0.04 2.84 851 851 224,583 1,560 851 0 0.00 442.00 28 140 2.33 0.9 0.30 0.37 0.25 0.04 2.84 851 851 224,583 1,560 851 0 0.00 442.00 29 145 2.42 0.9 0.30 0.37 0.25 0.04 2.84 851 851 224,583 1,560 851 0 0.00 442.00 30 150 2.50 0.9 0.30 0.37 0.25 0.04 2.84 851 851 224,583 1,560 851 0 0.00 442.00 31 155 2.58 0.9 0.30 0.37 0.25 0.04 2.84 851 851 224,583 1,560 851 0 0.00 442.00 32 160 2.67 0.9 0.30 0.37 0.25 0.04 2.84 851 851 224,583 1,560 851 0 0.00 442.00 33 165 2.75 1.0 0.33 0.37 0.28 0.05 3.15 945 945 224,586 1,560 945 0 0.00 442.00 34 170 2.83 1.0 0.33 0.37 0.28 0.05 3.15 945 945 224,586 1,560 945 0 0.00 442.00 35 175 2.92 1.0 0.33 0.37 0.28 0.05 3.15 945 945 224,586 1,560 945 0 0.00 442.00 36 180 3.00 1.0 0.33 0.37 0.28 0.05 3.15 945 945 224,586 1,560 945 0 0.00 442.00 37 185 3.08 1.0 0.33 0.37 0.28 0.05 3.15 945 945 224,586 1,560 945 0 0.00 442.00 38 190 3.17 1.1 0.36 0.37 0.31 0.05 3.47 1,040 1,040 224,589 1,560 1,040 0 0.00 442.00 39 195 3.25 1.1 0.36 0.37 0.31 0.05 3.47 1,040 1,040 224,589 1,560 1,040 0 0.00 442.00 40 200 3.33 1.1 0.36 0.37 0.31 0.05 3.47 1,040 1,040 224,589 1,560 1,040 0 0.00 442.00 41 205 3.42 1.2 0.40 0.37 0.34 0.03 1.85 554 554 224,573 1,560 554 0 0.00 442.00 42 210 3.50 1.3 0.43 0.37 0.37 0.06 3.95 1,184 1,184 224,594 1,560 1,184 0 0.00 442.00 43 215 3.58 1.4 0.46 0.37 0.39 0.10 6.05 1,814 1,814 224,614 1,560 1,560 254 0.01 442.00 44 220 3.67 1.4 0.46 0.37 0.39 0.10 6.05 1,814 2,069 224,622 1,560 1,560 509 0.01 442.00 45 225 3.75 1.5 0.50 0.37 0.42 0.13 8.15 2,444 2,953 224,651 1,560 1,560 1,393 0.03 442.01 46 230 3.83 1.5 0.50 0.37 0.42 0.13 8.15 2,444 3,837 224,680 1,560 1,560 2,277 0.05 442.01 47 235 3.92 1.6 0.53 0.37 0.45 0.16 10.25 3,075 5,352 224,729 1,561 1,561 3,791 0.09 442.02 48 240 4.00 1.6 0.53 0.37 0.45 0.16 10.25 3,075 6,866 224,778 1,561 1,561 5,305 0.12 442.02 49 245 4.08 1.7 0.56 0.37 0.48 0.19 12.35 3,705 9,010 224,848 1,561 1,561 7,448 0.17 442.03 50 250 4.17 1.8 0.60 0.37 0.51 0.23 14.45 4,335 11,783 224,938 1,562 1,562 10,221 0.23 442.04 Plate E-2.2 6-Hour Storm Page 8 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 62.90 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 THE WAVE 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 16.55 4,965 15,187 225,049 1,563 1,563 13,624 0.31 442.06 52 260 4.33 2.0 0.66 0.37 0.56 0.29 18.65 5,595 19,219 225,180 1,564 1,564 17,656 0.41 442.08 53 265 4.42 2.1 0.70 0.37 0.59 0.33 20.75 6,226 23,881 225,332 1,565 1,565 22,316 0.51 442.10 54 270 4.50 2.1 0.70 0.37 0.59 0.33 20.75 6,226 28,542 225,483 1,566 1,566 26,976 0.62 442.12 55 275 4.58 2.2 0.73 0.37 0.62 0.36 22.85 6,856 33,832 225,656 1,567 1,567 32,265 0.74 442.14 56 280 4.67 2.3 0.76 0.37 0.65 0.39 24.95 7,486 39,751 225,848 1,568 1,568 38,183 0.88 442.17 57 285 4.75 2.4 0.79 0.37 0.68 0.43 27.05 8,116 46,299 226,061 1,570 1,570 44,729 1.03 442.20 58 290 4.83 2.4 0.79 0.37 0.68 0.43 27.05 8,116 52,846 226,274 1,571 1,571 51,274 1.18 442.22 59 295 4.92 2.5 0.83 0.37 0.70 0.46 29.16 8,747 60,021 226,507 1,573 1,573 58,448 1.34 442.26 60 300 5.00 2.6 0.86 0.37 0.73 0.49 31.26 9,377 67,825 226,761 1,575 1,575 66,250 1.52 442.29 61 305 5.08 3.1 1.03 0.37 0.87 0.66 41.76 12,528 78,778 227,118 1,577 1,577 77,201 1.77 442.34 62 310 5.17 3.6 1.19 0.37 1.01 0.82 52.26 15,679 92,880 227,576 1,580 1,580 91,299 2.10 442.40 63 315 5.25 3.9 1.29 0.37 1.10 0.92 58.57 17,570 108,869 228,096 1,584 1,584 107,285 2.46 442.47 64 320 5.33 4.2 1.39 0.37 1.18 1.02 64.87 19,460 126,745 228,678 1,588 1,588 125,157 2.87 442.55 65 325 5.42 4.7 1.56 0.37 1.32 1.19 75.37 22,611 147,768 229,362 1,593 1,593 146,176 3.36 442.64 66 330 5.50 5.6 1.85 0.37 1.58 1.49 94.28 28,283 174,459 230,230 1,599 1,599 172,860 3.97 442.76 67 335 5.58 1.9 0.63 0.37 0.53 0.26 16.55 4,965 177,825 230,339 1,600 1,600 176,226 4.05 442.77 68 340 5.67 0.9 0.30 0.37 0.25 0.04 2.84 851 177,076 230,315 1,599 1,599 175,477 4.03 442.77 69 345 5.75 0.6 0.20 0.37 0.17 0.03 1.89 567 176,044 230,282 1,599 1,599 174,445 4.00 442.76 70 350 5.83 0.5 0.17 0.37 0.14 0.02 1.58 473 174,918 230,245 1,599 1,599 173,319 3.98 442.76 71 355 5.92 0.3 0.10 0.37 0.08 0.01 0.95 284 173,602 230,202 1,599 1,599 172,004 3.95 442.75 72 360 6.00 0.2 0.07 0.37 0.06 0.01 0.63 189 172,193 230,156 1,598 1,598 170,595 3.92 442.75 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 630,215 cu-ft 2.76 in 379,405 cu-ft 442.77 ft 94.28 cfs 222.82 cf/min 80,215 cu-ft 1.10 in 5.76 acft 250,810 cu-ft 4.05 acft 176,226 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 10/21/19 DRAINAGE AREA-ACRES 62.90 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 0.650 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 2 30 0.50 0.3 0.053 0.643 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 3 45 0.75 0.3 0.053 0.635 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 4 60 1.00 0.4 0.071 0.628 0.060 0.01 0.67 604 604 224,575 4,679 604 0 0.00 442.00 5 75 1.25 0.3 0.053 0.621 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 6 90 1.50 0.3 0.053 0.613 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 7 105 1.75 0.3 0.053 0.606 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 8 120 2.00 0.4 0.071 0.599 0.060 0.01 0.67 604 604 224,575 4,679 604 0 0.00 442.00 9 135 2.25 0.4 0.071 0.591 0.060 0.01 0.67 604 604 224,575 4,679 604 0 0.00 442.00 10 150 2.50 0.4 0.071 0.584 0.060 0.01 0.67 604 604 224,575 4,679 604 0 0.00 442.00 11 165 2.75 0.5 0.088 0.577 0.075 0.01 0.84 755 755 224,580 4,679 755 0 0.00 442.00 12 180 3.00 0.5 0.088 0.570 0.075 0.01 0.84 755 755 224,580 4,679 755 0 0.00 442.00 13 195 3.25 0.5 0.088 0.563 0.075 0.01 0.84 755 755 224,580 4,679 755 0 0.00 442.00 14 210 3.50 0.5 0.088 0.556 0.075 0.01 0.84 755 755 224,580 4,679 755 0 0.00 442.00 15 225 3.75 0.5 0.088 0.549 0.075 0.01 0.84 755 755 224,580 4,679 755 0 0.00 442.00 16 240 4.00 0.6 0.106 0.542 0.090 0.02 1.01 906 906 224,584 4,679 906 0 0.00 442.00 17 255 4.25 0.6 0.106 0.535 0.090 0.02 1.01 906 906 224,584 4,679 906 0 0.00 442.00 18 270 4.50 0.7 0.123 0.528 0.105 0.02 1.17 1,057 1,057 224,589 4,679 1,057 0 0.00 442.00 19 285 4.75 0.7 0.123 0.521 0.105 0.02 1.17 1,057 1,057 224,589 4,679 1,057 0 0.00 442.00 20 300 5.00 0.8 0.141 0.515 0.120 0.02 1.34 1,208 1,208 224,594 4,679 1,208 0 0.00 442.00 21 315 5.25 0.6 0.106 0.508 0.090 0.02 1.01 906 906 224,584 4,679 906 0 0.00 442.00 22 330 5.50 0.7 0.123 0.501 0.105 0.02 1.17 1,057 1,057 224,589 4,679 1,057 0 0.00 442.00 23 345 5.75 0.8 0.141 0.495 0.120 0.02 1.34 1,208 1,208 224,594 4,679 1,208 0 0.00 442.00 24 360 6.00 0.8 0.141 0.488 0.120 0.02 1.34 1,208 1,208 224,594 4,679 1,208 0 0.00 442.00 25 375 6.25 0.9 0.159 0.482 0.135 0.02 1.51 1,359 1,359 224,599 4,679 1,359 0 0.00 442.00 26 390 6.50 0.9 0.159 0.475 0.135 0.02 1.51 1,359 1,359 224,599 4,679 1,359 0 0.00 442.00 27 405 6.75 1.0 0.176 0.469 0.150 0.03 1.68 1,510 1,510 224,604 4,679 1,510 0 0.00 442.00 28 420 7.00 1.0 0.176 0.463 0.150 0.03 1.68 1,510 1,510 224,604 4,679 1,510 0 0.00 442.00 29 435 7.25 1.0 0.176 0.456 0.150 0.03 1.68 1,510 1,510 224,604 4,679 1,510 0 0.00 442.00 30 450 7.50 1.1 0.194 0.450 0.165 0.03 1.85 1,662 1,662 224,609 4,679 1,662 0 0.00 442.00 31 465 7.75 1.2 0.212 0.444 0.180 0.03 2.01 1,813 1,813 224,614 4,679 1,813 0 0.00 442.00 32 480 8.00 1.3 0.229 0.438 0.195 0.03 2.18 1,964 1,964 224,619 4,680 1,964 0 0.00 442.00 33 495 8.25 1.5 0.265 0.432 0.225 0.04 2.52 2,266 2,266 224,629 4,680 2,266 0 0.00 442.00 34 510 8.50 1.5 0.265 0.426 0.225 0.04 2.52 2,266 2,266 224,629 4,680 2,266 0 0.00 442.00 35 525 8.75 1.6 0.282 0.420 0.240 0.04 2.69 2,417 2,417 224,634 4,680 2,417 0 0.00 442.00 36 540 9.00 1.7 0.300 0.414 0.255 0.04 2.85 2,568 2,568 224,639 4,680 2,568 0 0.00 442.00 37 555 9.25 1.9 0.335 0.408 0.285 0.05 3.19 2,870 2,870 224,648 4,680 2,870 0 0.00 442.00 38 570 9.50 2.0 0.353 0.402 0.300 0.05 3.36 3,021 3,021 224,653 4,680 3,021 0 0.00 442.00 39 585 9.75 2.1 0.370 0.397 0.315 0.06 3.52 3,172 3,172 224,658 4,680 3,172 0 0.00 442.00 40 600 10.00 2.2 0.388 0.391 0.330 0.06 3.69 3,323 3,323 224,663 4,680 3,323 0 0.00 442.00 41 615 10.25 1.5 0.265 0.385 0.225 0.04 2.52 2,266 2,266 224,629 4,680 2,266 0 0.00 442.00 42 630 10.50 1.5 0.265 0.380 0.225 0.04 2.52 2,266 2,266 224,629 4,680 2,266 0 0.00 442.00 43 645 10.75 2.0 0.353 0.374 0.300 0.05 3.36 3,021 3,021 224,653 4,680 3,021 0 0.00 442.00 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Loss Rate THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 62.90 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 THE WAVE 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 3.36 3,021 3,021 224,653 4,680 3,021 0 0.00 442.00 45 675 11.25 1.9 0.335 0.363 0.285 0.05 3.19 2,870 2,870 224,648 4,680 2,870 0 0.00 442.00 46 690 11.50 1.9 0.335 0.358 0.285 0.05 3.19 2,870 2,870 224,648 4,680 2,870 0 0.00 442.00 47 705 11.75 1.7 0.300 0.353 0.255 0.04 2.85 2,568 2,568 224,639 4,680 2,568 0 0.00 442.00 48 720 12.00 1.8 0.318 0.347 0.270 0.05 3.02 2,719 2,719 224,643 4,680 2,719 0 0.00 442.00 49 735 12.25 2.5 0.441 0.342 0.375 0.10 6.27 5,645 5,645 224,739 4,682 4,682 963 0.02 442.00 50 750 12.50 2.6 0.459 0.337 0.390 0.12 7.72 6,944 7,907 224,812 4,684 4,684 3,224 0.07 442.01 51 765 12.75 2.8 0.494 0.332 0.420 0.16 10.27 9,247 12,471 224,961 4,687 4,687 7,784 0.18 442.03 52 780 13.00 2.9 0.512 0.327 0.435 0.18 11.71 10,540 18,324 225,151 4,691 4,691 13,634 0.31 442.06 53 795 13.25 3.4 0.600 0.322 0.510 0.28 17.62 15,857 29,491 225,514 4,698 4,698 24,793 0.57 442.11 54 810 13.50 3.4 0.600 0.317 0.510 0.28 17.93 16,135 40,928 225,886 4,706 4,706 36,222 0.83 442.16 55 825 13.75 2.3 0.406 0.312 0.345 0.09 5.93 5,334 41,556 225,907 4,706 4,706 36,849 0.85 442.16 56 840 14.00 2.3 0.406 0.308 0.345 0.10 6.23 5,605 42,455 225,936 4,707 4,707 37,748 0.87 442.17 57 855 14.25 2.7 0.476 0.303 0.405 0.17 11.00 9,901 47,648 226,105 4,711 4,711 42,938 0.99 442.19 58 870 14.50 2.6 0.459 0.298 0.390 0.16 10.18 9,158 52,095 226,250 4,714 4,714 47,382 1.09 442.21 59 885 14.75 2.6 0.459 0.294 0.390 0.16 10.46 9,418 56,800 226,403 4,717 4,717 52,083 1.20 442.23 60 900 15.00 2.5 0.441 0.289 0.375 0.15 9.63 8,667 60,750 226,531 4,719 4,719 56,031 1.29 442.25 61 915 15.25 2.4 0.423 0.285 0.360 0.14 8.79 7,913 63,944 226,635 4,722 4,722 59,222 1.36 442.26 62 930 15.50 2.3 0.406 0.280 0.345 0.13 7.95 7,155 66,377 226,714 4,723 4,723 61,654 1.42 442.27 63 945 15.75 1.9 0.335 0.276 0.285 0.06 3.75 3,372 65,025 226,670 4,722 4,722 60,303 1.38 442.26 64 960 16.00 1.9 0.335 0.272 0.285 0.06 4.01 3,612 63,916 226,634 4,722 4,722 59,194 1.36 442.26 65 975 16.25 0.4 0.071 0.268 0.060 0.01 0.67 604 59,798 226,500 4,719 4,719 55,079 1.26 442.24 66 990 16.50 0.4 0.071 0.264 0.060 0.01 0.67 604 55,684 226,366 4,716 4,716 50,968 1.17 442.22 67 1005 16.75 0.3 0.053 0.260 0.045 0.01 0.50 453 51,421 226,228 4,713 4,713 46,708 1.07 442.20 68 1020 17.00 0.3 0.053 0.256 0.045 0.01 0.50 453 47,161 226,089 4,710 4,710 42,451 0.97 442.19 69 1035 17.25 0.5 0.088 0.252 0.075 0.01 0.84 755 43,206 225,960 4,708 4,708 38,498 0.88 442.17 70 1050 17.50 0.5 0.088 0.248 0.075 0.01 0.84 755 39,254 225,832 4,705 4,705 34,549 0.79 442.15 71 1065 17.75 0.5 0.088 0.244 0.075 0.01 0.84 755 35,304 225,703 4,702 4,702 30,602 0.70 442.13 72 1080 18.00 0.4 0.071 0.241 0.060 0.01 0.67 604 31,206 225,570 4,699 4,699 26,507 0.61 442.12 73 1095 18.25 0.4 0.071 0.237 0.060 0.01 0.67 604 27,111 225,437 4,697 4,697 22,414 0.51 442.10 74 1110 18.50 0.4 0.071 0.234 0.060 0.01 0.67 604 23,018 225,304 4,694 4,694 18,325 0.42 442.08 75 1125 18.75 0.3 0.053 0.230 0.045 0.01 0.50 453 18,778 225,166 4,691 4,691 14,087 0.32 442.06 76 1140 19.00 0.2 0.035 0.227 0.030 0.01 0.34 302 14,389 225,023 4,688 4,688 9,701 0.22 442.04 77 1155 19.25 0.3 0.053 0.224 0.045 0.01 0.50 453 10,154 224,885 4,685 4,685 5,469 0.13 442.02 78 1170 19.50 0.4 0.071 0.221 0.060 0.01 0.67 604 6,073 224,753 4,682 4,682 1,391 0.03 442.01 79 1185 19.75 0.3 0.053 0.218 0.045 0.01 0.50 453 1,844 224,615 4,679 1,844 0 0.00 442.00 80 1200 20.00 0.2 0.035 0.215 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 81 1215 20.25 0.3 0.053 0.212 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 82 1230 20.50 0.3 0.053 0.209 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 83 1245 20.75 0.3 0.053 0.207 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 84 1260 21.00 0.2 0.035 0.204 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 85 1275 21.25 0.3 0.053 0.202 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 86 1290 21.50 0.2 0.035 0.199 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 Plate E-2.2 24-Hour Storm Page 11 of 13 PROJECT: Job No.:2553 BY:DLS DATE 10/21/19 DRAINAGE AREA-ACRES 62.90 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 THE WAVE 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 0.50 453 453 224,570 4,679 453 0 0.00 442.00 88 1320 22.00 0.2 0.035 0.195 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 89 1335 22.25 0.3 0.053 0.193 0.045 0.01 0.50 453 453 224,570 4,679 453 0 0.00 442.00 90 1350 22.50 0.2 0.035 0.191 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 91 1365 22.75 0.2 0.035 0.190 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 92 1380 23.00 0.2 0.035 0.188 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 93 1395 23.25 0.2 0.035 0.187 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 94 1410 23.50 0.2 0.035 0.186 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 95 1425 23.75 0.2 0.035 0.185 0.030 0.01 0.34 302 302 224,565 4,678 302 0 0.00 442.00 96 1440 24.00 0.2 0.035 0.184 0.030 0.01 0.34 302 302 224,565 4,678 302 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 1,006,974 cu-ft 783,505 cu-ft 442.27 ft 17.93 cfs 223,470 cu-ft 155.19 cf/min 0.98 in 5.13 acft 223,470 cu-ft 1.42 acft 61,654 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 THE WAVE 2553 ()()2121213 1 AAAAEEV++−= 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 0.249 D 56 0.51 1.00 4 B SF - LOW DENSITY 42.760 D 56 0.51 0.30 9 B LANDSCAPING 1.802 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 October 21, 2019 PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION THE WAVE FUTURE BASIN DA-F PROJECT: Job No.: BY:DATE:10/21/19 [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)60,870 175,043 272,430 561,326 EFFECTIVE RAIN (in)1.07 1.06 1.09 0.96 FLOOD VOLUME (cu-ft)173,367 173,059 176,525 156,025 (acre-ft)3.98 3.97 4.05 3.58 PEAK FLOW (cfs)N/A 78.24 66.90 12.54 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 THE WAVE [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:10/21/19 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 0.249 0.006 0.0003 DEVELOPED 0.1000 0.0006 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 1.802 0.040 0.0187 DEVELOPED 0.8200 0.0330 SUM 44.811 SUM 0.3742 0.6633 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.187103113 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)=0.3742 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 THE WAVE 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 10/21/19 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 11.20 2 10 0.17 4.2 0.73 0.37 0.62 0.35 15.88 3 15 0.25 4.4 0.76 0.37 0.65 0.39 17.45 4 20 0.33 4.6 0.79 0.37 0.68 0.42 19.01 5 25 0.42 5.0 0.86 0.37 0.73 0.49 22.13 6 30 0.50 5.6 0.97 0.37 0.82 0.59 26.82 7 35 0.58 6.4 1.11 0.37 0.94 0.73 33.06 8 40 0.67 8.1 1.40 0.37 1.19 1.03 46.34 9 45 0.75 13.1 2.26 0.37 1.92 1.89 85.38 10 50 0.83 34.5 5.96 0.37 5.07 5.59 252.46 11 55 0.92 6.7 1.16 0.37 0.98 0.78 35.40 12 60 1.00 3.8 0.66 0.37 0.56 0.28 12.76 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)1.44 RAINFALL VOLUME (cuft)234,237 SOIL LOSSES (cuft)60,870 EFFECTIVE RAIN (in)1.07 FLOOD VOLUME (acft)3.98 FLOOD VOLUME (cuft)173,367 PEAK FLOW RATE (cfs)252.46 in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE HYDROLOGY SHORTCUT METHOD Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 10/21/19 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 0.50 5 25 0.42 1.5 0.39 0.37 0.33 0.01 0.50 6 30 0.50 1.8 0.46 0.37 0.39 0.09 3.98 7 35 0.58 1.5 0.39 0.37 0.33 0.01 0.50 8 40 0.67 1.8 0.46 0.37 0.39 0.09 3.98 9 45 0.75 1.8 0.46 0.37 0.39 0.09 3.98 10 50 0.83 1.5 0.39 0.37 0.33 0.01 0.50 11 55 0.92 1.6 0.41 0.37 0.35 0.04 1.66 12 60 1.00 1.8 0.46 0.37 0.39 0.09 3.98 13 65 1.08 2.2 0.56 0.37 0.48 0.19 8.62 14 70 1.17 2.2 0.56 0.37 0.48 0.19 8.62 15 75 1.25 2.2 0.56 0.37 0.48 0.19 8.62 16 80 1.33 2.0 0.51 0.37 0.44 0.14 6.30 17 85 1.42 2.6 0.67 0.37 0.57 0.29 13.26 18 90 1.50 2.7 0.69 0.37 0.59 0.32 14.42 19 95 1.58 2.4 0.62 0.37 0.52 0.24 10.94 20 100 1.67 2.7 0.69 0.37 0.59 0.32 14.42 21 105 1.75 3.3 0.85 0.37 0.72 0.47 21.38 22 110 1.83 3.1 0.80 0.37 0.68 0.42 19.06 23 115 1.92 2.9 0.74 0.37 0.63 0.37 16.74 24 120 2.00 3.0 0.77 0.37 0.65 0.40 17.90 25 125 2.08 3.1 0.80 0.37 0.68 0.42 19.06 26 130 2.17 4.2 1.08 0.37 0.92 0.70 31.83 27 135 2.25 5.0 1.28 0.37 1.09 0.91 41.11 28 140 2.33 3.5 0.90 0.37 0.76 0.52 23.70 29 145 2.42 6.8 1.75 0.37 1.48 1.37 61.99 30 150 2.50 7.3 1.87 0.37 1.59 1.50 67.80 31 155 2.58 8.2 2.11 0.37 1.79 1.73 78.24 32 160 2.67 5.9 1.52 0.37 1.29 1.14 51.55 33 165 2.75 2.0 0.51 0.37 0.44 0.14 6.30 34 170 2.83 1.8 0.46 0.37 0.39 0.09 3.98 35 175 2.92 1.8 0.46 0.37 0.39 0.09 3.98 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)175,043 EFFECTIVE RAIN (in)1.06 FLOOD VOLUME (acft)3.97 FLOOD VOLUME (cuft)173,059 PEAK FLOW RATE (cfs)78.24 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 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 0.374 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 1.05 42 210 3.50 1.3 0.431 0.37 0.37 0.06 2.55 43 215 3.58 1.4 0.464 0.37 0.39 0.09 4.04 44 220 3.67 1.4 0.464 0.37 0.39 0.09 4.04 45 225 3.75 1.5 0.497 0.37 0.42 0.12 5.54 46 230 3.83 1.5 0.497 0.37 0.42 0.12 5.54 47 235 3.92 1.6 0.530 0.37 0.45 0.16 7.04 48 240 4.00 1.6 0.530 0.37 0.45 0.16 7.04 49 245 4.08 1.7 0.563 0.37 0.48 0.19 8.53 50 250 4.17 1.8 0.596 0.37 0.51 0.22 10.03 51 255 4.25 1.9 0.629 0.37 0.53 0.26 11.53 52 260 4.33 2.0 0.662 0.37 0.56 0.29 13.02 53 265 4.42 2.1 0.696 0.37 0.59 0.32 14.52 54 270 4.50 2.1 0.696 0.37 0.59 0.32 14.52 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM THE WAVERCFC & 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 10/21/19 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 0.374 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 THE WAVERCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 55 275 4.58 2.2 0.729 0.37 0.62 0.35 16.01 56 280 4.67 2.3 0.762 0.37 0.65 0.39 17.51 57 285 4.75 2.4 0.795 0.37 0.68 0.42 19.01 58 290 4.83 2.4 0.795 0.37 0.68 0.42 19.01 59 295 4.92 2.5 0.828 0.37 0.70 0.45 20.50 60 300 5.00 2.6 0.861 0.37 0.73 0.49 22.00 61 305 5.08 3.1 1.027 0.37 0.87 0.65 29.48 62 310 5.17 3.6 1.192 0.37 1.01 0.82 36.97 63 315 5.25 3.9 1.292 0.37 1.10 0.92 41.46 64 320 5.33 4.2 1.391 0.37 1.18 1.02 45.95 65 325 5.42 4.7 1.557 0.37 1.32 1.18 53.43 66 330 5.50 5.6 1.855 0.37 1.58 1.48 66.90 67 335 5.58 1.9 0.629 0.37 0.53 0.26 11.53 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)272,430 EFFECTIVE RAIN (in)1.09 FLOOD VOLUME (acft)4.05 FLOOD VOLUME (cuft)176,525 PEAK FLOW RATE (cfs)66.90 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 10/21/19 DRAINAGE AREA-ACRES 44.811 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3742 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 0.661 0.030 0.005 0.24 2 30 0.50 0.3 0.053 0.653 0.045 0.008 0.36 3 45 0.75 0.3 0.053 0.646 0.045 0.008 0.36 4 60 1.00 0.4 0.071 0.638 0.060 0.011 0.48 5 75 1.25 0.3 0.053 0.630 0.045 0.008 0.36 6 90 1.50 0.3 0.053 0.623 0.045 0.008 0.36 7 105 1.75 0.3 0.053 0.615 0.045 0.008 0.36 8 120 2.00 0.4 0.071 0.608 0.060 0.011 0.48 9 135 2.25 0.4 0.071 0.601 0.060 0.011 0.48 10 150 2.50 0.4 0.071 0.593 0.060 0.011 0.48 11 165 2.75 0.5 0.088 0.586 0.075 0.013 0.60 12 180 3.00 0.5 0.088 0.579 0.075 0.013 0.60 13 195 3.25 0.5 0.088 0.572 0.075 0.013 0.60 14 210 3.50 0.5 0.088 0.565 0.075 0.013 0.60 15 225 3.75 0.5 0.088 0.558 0.075 0.013 0.60 16 240 4.00 0.6 0.106 0.551 0.090 0.016 0.72 17 255 4.25 0.6 0.106 0.544 0.090 0.016 0.72 18 270 4.50 0.7 0.123 0.537 0.105 0.019 0.84 19 285 4.75 0.7 0.123 0.530 0.105 0.019 0.84 20 300 5.00 0.8 0.141 0.523 0.120 0.021 0.96 21 315 5.25 0.6 0.106 0.516 0.090 0.016 0.72 22 330 5.50 0.7 0.123 0.509 0.105 0.019 0.84 23 345 5.75 0.8 0.141 0.503 0.120 0.021 0.96 24 360 6.00 0.8 0.141 0.496 0.120 0.021 0.96 25 375 6.25 0.9 0.159 0.490 0.135 0.024 1.08 26 390 6.50 0.9 0.159 0.483 0.135 0.024 1.08 27 405 6.75 1.0 0.176 0.477 0.150 0.026 1.20 28 420 7.00 1.0 0.176 0.470 0.150 0.026 1.20 29 435 7.25 1.0 0.176 0.464 0.150 0.026 1.20 30 450 7.50 1.1 0.194 0.457 0.165 0.029 1.32 31 465 7.75 1.2 0.212 0.451 0.180 0.032 1.43 32 480 8.00 1.3 0.229 0.445 0.195 0.034 1.55 33 495 8.25 1.5 0.265 0.439 0.225 0.040 1.79 34 510 8.50 1.5 0.265 0.433 0.225 0.040 1.79 35 525 8.75 1.6 0.282 0.427 0.240 0.042 1.91 36 540 9.00 1.7 0.300 0.421 0.255 0.045 2.03 37 555 9.25 1.9 0.335 0.415 0.285 0.050 2.27 38 570 9.50 2.0 0.353 0.409 0.300 0.053 2.39 39 585 9.75 2.1 0.370 0.403 0.315 0.056 2.51 40 600 10.00 2.2 0.388 0.397 0.330 0.058 2.63 41 615 10.25 1.5 0.265 0.391 0.225 0.040 1.79 42 630 10.50 1.5 0.265 0.386 0.225 0.040 1.79 43 645 10.75 2.0 0.353 0.380 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 0.369 0.285 0.050 2.27 46 690 11.50 1.9 0.335 0.364 0.285 0.050 2.27 47 705 11.75 1.7 0.300 0.358 0.255 0.045 2.03 48 720 12.00 1.8 0.318 0.353 0.270 0.048 2.15 49 735 12.25 2.5 0.441 0.348 0.375 0.093 4.22 50 750 12.50 2.6 0.459 0.342 0.390 0.116 5.25 51 765 12.75 2.8 0.494 0.337 0.420 0.157 7.08 52 780 13.00 2.9 0.512 0.332 0.435 0.179 8.11 53 795 13.25 3.4 0.600 0.327 0.510 0.273 12.32 54 810 13.50 3.4 0.600 0.322 0.510 0.278 12.54 55 825 13.75 2.3 0.406 0.317 0.345 0.088 4.00 56 840 14.00 2.3 0.406 0.312 0.345 0.093 4.22 57 855 14.25 2.7 0.476 0.308 0.405 0.169 7.62 58 870 14.50 2.6 0.459 0.303 0.390 0.156 7.03 59 885 14.75 2.6 0.459 0.298 0.390 0.160 7.24 60 900 15.00 2.5 0.441 0.294 0.375 0.147 6.65 61 915 15.25 2.4 0.423 0.289 0.360 0.134 6.06 62 930 15.50 2.3 0.406 0.285 0.345 0.121 5.46 63 945 15.75 1.9 0.335 0.280 0.285 0.055 2.47 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 44.811 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3742 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 THE WAVE HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 64 960 16.00 1.9 0.335 0.276 0.285 0.059 2.66 65 975 16.25 0.4 0.071 0.272 0.060 0.011 0.48 66 990 16.50 0.4 0.071 0.268 0.060 0.011 0.48 67 1005 16.75 0.3 0.053 0.264 0.045 0.008 0.36 68 1020 17.00 0.3 0.053 0.260 0.045 0.008 0.36 69 1035 17.25 0.5 0.088 0.256 0.075 0.013 0.60 70 1050 17.50 0.5 0.088 0.252 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 0.245 0.060 0.011 0.48 73 1095 18.25 0.4 0.071 0.241 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 0.234 0.045 0.008 0.36 76 1140 19.00 0.2 0.035 0.231 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 0.213 0.045 0.008 0.36 83 1245 20.75 0.3 0.053 0.210 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 0.205 0.045 0.008 0.36 86 1290 21.50 0.2 0.035 0.203 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 0.193 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 0.190 0.030 0.005 0.24 94 1410 23.50 0.2 0.035 0.189 0.030 0.005 0.24 95 1425 23.75 0.2 0.035 0.188 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)561,326 EFFECTIVE RAIN (in)0.96 FLOOD VOLUME (acft)3.58 FLOOD VOLUME (cuft)156,025 PEAK FLOW (cfs)12.54 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 0.535 D 56 0.51 1.00 4 B SF - LOW DENSITY 34.432 D 56 0.51 0.30 9 B LANDSCAPING 3.023 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 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 October 21, 2019 PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION THE WAVE FUTURE BASIN DA-G PROJECT: Job No.: BY:DATE:10/21/19 [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)198,582 295,115 380,616 608,158 SOIL LOSSES (cuft)51,725 148,720 231,232 476,283 EFFECTIVE RAIN (in)1.06 1.06 1.08 0.96 FLOOD VOLUME (cu-ft)146,857 146,395 149,383 131,875 (acre-ft)3.37 3.36 3.43 3.03 PEAK FLOW (cfs)N/A 66.30 56.68 10.61 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 [8] ELEVATION OF HEADWATER #DIV/0! 0.00 [12] S^0.5 0.000 0 [17] 100% OF LAG-MINUTES #DIV/0! #DIV/0! [14] AVERAGE MANNINGS 'N' [15] LAG TIME-HOURS #DIV/0! [16] LAG TIME-MINUTES 0 DLS 0.000 0 0 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD FUTURE BASIN DA-G THE WAVE [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. 37.990 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 Plate E-2.1 Page 2 of 9 PROJECT: Job No.: BY:DATE:10/21/19 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 0.535 0.014 0.0007 DEVELOPED 0.1000 0.0014 B 56 0.51 30%0.37 34.432 0.906 0.3374 DEVELOPED 0.6600 0.5982 B 56 0.51 10%0.46 3.023 0.080 0.0369 DEVELOPED 0.8200 0.0653 SUM 37.990 SUM 0.3751 0.6648 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.187540049 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)=0.3751 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 THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 37.99 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 9.46 2 10 0.17 4.2 0.73 0.38 0.62 0.35 13.43 3 15 0.25 4.4 0.76 0.38 0.65 0.39 14.76 4 20 0.33 4.6 0.79 0.38 0.68 0.42 16.08 5 25 0.42 5.0 0.86 0.38 0.73 0.49 18.73 6 30 0.50 5.6 0.97 0.38 0.82 0.59 22.70 7 35 0.58 6.4 1.11 0.38 0.94 0.73 28.00 8 40 0.67 8.1 1.40 0.38 1.19 1.02 39.25 9 45 0.75 13.1 2.26 0.38 1.92 1.89 72.35 10 50 0.83 34.5 5.96 0.38 5.07 5.59 214.00 11 55 0.92 6.7 1.16 0.38 0.98 0.78 29.98 12 60 1.00 3.8 0.66 0.38 0.56 0.28 10.79 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)1.44 RAINFALL VOLUME (cuft)198,582 SOIL LOSSES (cuft)51,725 EFFECTIVE RAIN (in)1.06 FLOOD VOLUME (acft)3.37 FLOOD VOLUME (cuft)146,857 PEAK FLOW RATE (cfs)214.00 in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE HYDROLOGY SHORTCUT METHOD Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 10/21/19 DRAINAGE AREA-ACRES 37.99 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 1.92 2 10 0.17 1.3 0.33 0.38 0.28 0.05 1.92 3 15 0.25 1.1 0.28 0.38 0.24 0.04 1.62 4 20 0.33 1.5 0.39 0.38 0.33 0.01 0.39 5 25 0.42 1.5 0.39 0.38 0.33 0.01 0.39 6 30 0.50 1.8 0.46 0.38 0.39 0.09 3.34 7 35 0.58 1.5 0.39 0.38 0.33 0.01 0.39 8 40 0.67 1.8 0.46 0.38 0.39 0.09 3.34 9 45 0.75 1.8 0.46 0.38 0.39 0.09 3.34 10 50 0.83 1.5 0.39 0.38 0.33 0.01 0.39 11 55 0.92 1.6 0.41 0.38 0.35 0.04 1.37 12 60 1.00 1.8 0.46 0.38 0.39 0.09 3.34 13 65 1.08 2.2 0.56 0.38 0.48 0.19 7.27 14 70 1.17 2.2 0.56 0.38 0.48 0.19 7.27 15 75 1.25 2.2 0.56 0.38 0.48 0.19 7.27 16 80 1.33 2.0 0.51 0.38 0.44 0.14 5.31 17 85 1.42 2.6 0.67 0.38 0.57 0.29 11.21 18 90 1.50 2.7 0.69 0.38 0.59 0.32 12.19 19 95 1.58 2.4 0.62 0.38 0.52 0.24 9.24 20 100 1.67 2.7 0.69 0.38 0.59 0.32 12.19 21 105 1.75 3.3 0.85 0.38 0.72 0.47 18.09 22 110 1.83 3.1 0.80 0.38 0.68 0.42 16.13 23 115 1.92 2.9 0.74 0.38 0.63 0.37 14.16 24 120 2.00 3.0 0.77 0.38 0.65 0.40 15.14 25 125 2.08 3.1 0.80 0.38 0.68 0.42 16.13 26 130 2.17 4.2 1.08 0.38 0.92 0.70 26.95 27 135 2.25 5.0 1.28 0.38 1.09 0.91 34.82 28 140 2.33 3.5 0.90 0.38 0.76 0.52 20.06 29 145 2.42 6.8 1.75 0.38 1.48 1.37 52.52 30 150 2.50 7.3 1.87 0.38 1.59 1.50 57.44 31 155 2.58 8.2 2.11 0.38 1.79 1.73 66.30 32 160 2.67 5.9 1.52 0.38 1.29 1.14 43.67 33 165 2.75 2.0 0.51 0.38 0.44 0.14 5.31 34 170 2.83 1.8 0.46 0.38 0.39 0.09 3.34 35 175 2.92 1.8 0.46 0.38 0.39 0.09 3.34 36 180 3.00 0.6 0.15 0.38 0.13 0.02 0.89 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)2.14 RAINFALL VOLUME (cuft)295,115 SOIL LOSSES (cuft)148,720 EFFECTIVE RAIN (in)1.06 FLOOD VOLUME (acft)3.36 FLOOD VOLUME (cuft)146,395 PEAK FLOW RATE (cfs)66.30 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 37.99 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 0.95 2 10 0.17 0.6 0.199 0.38 0.17 0.03 1.14 3 15 0.25 0.6 0.199 0.38 0.17 0.03 1.14 4 20 0.33 0.6 0.199 0.38 0.17 0.03 1.14 5 25 0.42 0.6 0.199 0.38 0.17 0.03 1.14 6 30 0.50 0.7 0.232 0.38 0.20 0.03 1.33 7 35 0.58 0.7 0.232 0.38 0.20 0.03 1.33 8 40 0.67 0.7 0.232 0.38 0.20 0.03 1.33 9 45 0.75 0.7 0.232 0.38 0.20 0.03 1.33 10 50 0.83 0.7 0.232 0.38 0.20 0.03 1.33 11 55 0.92 0.7 0.232 0.38 0.20 0.03 1.33 12 60 1.00 0.8 0.265 0.38 0.23 0.04 1.52 13 65 1.08 0.8 0.265 0.38 0.23 0.04 1.52 14 70 1.17 0.8 0.265 0.38 0.23 0.04 1.52 15 75 1.25 0.8 0.265 0.38 0.23 0.04 1.52 16 80 1.33 0.8 0.265 0.38 0.23 0.04 1.52 17 85 1.42 0.8 0.265 0.38 0.23 0.04 1.52 18 90 1.50 0.8 0.265 0.38 0.23 0.04 1.52 19 95 1.58 0.8 0.265 0.38 0.23 0.04 1.52 20 100 1.67 0.8 0.265 0.38 0.23 0.04 1.52 21 105 1.75 0.8 0.265 0.38 0.23 0.04 1.52 22 110 1.83 0.8 0.265 0.38 0.23 0.04 1.52 23 115 1.92 0.8 0.265 0.38 0.23 0.04 1.52 24 120 2.00 0.9 0.298 0.38 0.25 0.04 1.71 25 125 2.08 0.8 0.265 0.38 0.23 0.04 1.52 26 130 2.17 0.9 0.298 0.38 0.25 0.04 1.71 27 135 2.25 0.9 0.298 0.38 0.25 0.04 1.71 28 140 2.33 0.9 0.298 0.38 0.25 0.04 1.71 29 145 2.42 0.9 0.298 0.38 0.25 0.04 1.71 30 150 2.50 0.9 0.298 0.38 0.25 0.04 1.71 31 155 2.58 0.9 0.298 0.38 0.25 0.04 1.71 32 160 2.67 0.9 0.298 0.38 0.25 0.04 1.71 33 165 2.75 1.0 0.331 0.38 0.28 0.05 1.90 34 170 2.83 1.0 0.331 0.38 0.28 0.05 1.90 35 175 2.92 1.0 0.331 0.38 0.28 0.05 1.90 36 180 3.00 1.0 0.331 0.38 0.28 0.05 1.90 37 185 3.08 1.0 0.331 0.38 0.28 0.05 1.90 38 190 3.17 1.1 0.364 0.38 0.31 0.05 2.09 39 195 3.25 1.1 0.364 0.38 0.31 0.05 2.09 40 200 3.33 1.1 0.364 0.38 0.31 0.05 2.09 41 205 3.42 1.2 0.397 0.38 0.34 0.02 0.86 42 210 3.50 1.3 0.431 0.38 0.37 0.06 2.13 43 215 3.58 1.4 0.464 0.38 0.39 0.09 3.39 44 220 3.67 1.4 0.464 0.38 0.39 0.09 3.39 45 225 3.75 1.5 0.497 0.38 0.42 0.12 4.66 46 230 3.83 1.5 0.497 0.38 0.42 0.12 4.66 47 235 3.92 1.6 0.530 0.38 0.45 0.15 5.93 48 240 4.00 1.6 0.530 0.38 0.45 0.15 5.93 49 245 4.08 1.7 0.563 0.38 0.48 0.19 7.20 50 250 4.17 1.8 0.596 0.38 0.51 0.22 8.47 51 255 4.25 1.9 0.629 0.38 0.53 0.25 9.74 52 260 4.33 2.0 0.662 0.38 0.56 0.29 11.01 53 265 4.42 2.1 0.696 0.38 0.59 0.32 12.28 54 270 4.50 2.1 0.696 0.38 0.59 0.32 12.28 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM THE WAVERCFC & 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 10/21/19 DRAINAGE AREA-ACRES 37.99 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 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM THE WAVERCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 55 275 4.58 2.2 0.729 0.38 0.62 0.35 13.54 56 280 4.67 2.3 0.762 0.38 0.65 0.39 14.81 57 285 4.75 2.4 0.795 0.38 0.68 0.42 16.08 58 290 4.83 2.4 0.795 0.38 0.68 0.42 16.08 59 295 4.92 2.5 0.828 0.38 0.70 0.45 17.35 60 300 5.00 2.6 0.861 0.38 0.73 0.49 18.62 61 305 5.08 3.1 1.027 0.38 0.87 0.65 24.96 62 310 5.17 3.6 1.192 0.38 1.01 0.82 31.31 63 315 5.25 3.9 1.292 0.38 1.10 0.92 35.11 64 320 5.33 4.2 1.391 0.38 1.18 1.02 38.92 65 325 5.42 4.7 1.557 0.38 1.32 1.18 45.26 66 330 5.50 5.6 1.855 0.38 1.58 1.48 56.68 67 335 5.58 1.9 0.629 0.38 0.53 0.25 9.74 68 340 5.67 0.9 0.298 0.38 0.25 0.04 1.71 69 345 5.75 0.6 0.199 0.38 0.17 0.03 1.14 70 350 5.83 0.5 0.166 0.38 0.14 0.02 0.95 71 355 5.92 0.3 0.099 0.38 0.08 0.01 0.57 72 360 6.00 0.2 0.066 0.38 0.06 0.01 0.38 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)2.76 RAINFALL VOLUME (cuft)380,616 SOIL LOSSES (cuft)231,232 EFFECTIVE RAIN (in)1.08 FLOOD VOLUME (acft)3.43 FLOOD VOLUME (cuft)149,383 PEAK FLOW RATE (cfs)56.68 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 10/21/19 DRAINAGE AREA-ACRES 37.990 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3751 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 0.662 0.030 0.005 0.20 2 30 0.50 0.3 0.053 0.655 0.045 0.008 0.30 3 45 0.75 0.3 0.053 0.647 0.045 0.008 0.30 4 60 1.00 0.4 0.071 0.639 0.060 0.011 0.41 5 75 1.25 0.3 0.053 0.632 0.045 0.008 0.30 6 90 1.50 0.3 0.053 0.624 0.045 0.008 0.30 7 105 1.75 0.3 0.053 0.617 0.045 0.008 0.30 8 120 2.00 0.4 0.071 0.609 0.060 0.011 0.41 9 135 2.25 0.4 0.071 0.602 0.060 0.011 0.41 10 150 2.50 0.4 0.071 0.595 0.060 0.011 0.41 11 165 2.75 0.5 0.088 0.588 0.075 0.013 0.51 12 180 3.00 0.5 0.088 0.580 0.075 0.013 0.51 13 195 3.25 0.5 0.088 0.573 0.075 0.013 0.51 14 210 3.50 0.5 0.088 0.566 0.075 0.013 0.51 15 225 3.75 0.5 0.088 0.559 0.075 0.013 0.51 16 240 4.00 0.6 0.106 0.552 0.090 0.016 0.61 17 255 4.25 0.6 0.106 0.545 0.090 0.016 0.61 18 270 4.50 0.7 0.123 0.538 0.105 0.019 0.71 19 285 4.75 0.7 0.123 0.531 0.105 0.019 0.71 20 300 5.00 0.8 0.141 0.524 0.120 0.021 0.81 21 315 5.25 0.6 0.106 0.517 0.090 0.016 0.61 22 330 5.50 0.7 0.123 0.511 0.105 0.019 0.71 23 345 5.75 0.8 0.141 0.504 0.120 0.021 0.81 24 360 6.00 0.8 0.141 0.497 0.120 0.021 0.81 25 375 6.25 0.9 0.159 0.491 0.135 0.024 0.91 26 390 6.50 0.9 0.159 0.484 0.135 0.024 0.91 27 405 6.75 1.0 0.176 0.478 0.150 0.026 1.01 28 420 7.00 1.0 0.176 0.471 0.150 0.026 1.01 29 435 7.25 1.0 0.176 0.465 0.150 0.026 1.01 30 450 7.50 1.1 0.194 0.458 0.165 0.029 1.11 31 465 7.75 1.2 0.212 0.452 0.180 0.032 1.22 32 480 8.00 1.3 0.229 0.446 0.195 0.034 1.32 33 495 8.25 1.5 0.265 0.440 0.225 0.040 1.52 34 510 8.50 1.5 0.265 0.434 0.225 0.040 1.52 35 525 8.75 1.6 0.282 0.428 0.240 0.042 1.62 36 540 9.00 1.7 0.300 0.422 0.255 0.045 1.72 37 555 9.25 1.9 0.335 0.416 0.285 0.050 1.93 38 570 9.50 2.0 0.353 0.410 0.300 0.053 2.03 39 585 9.75 2.1 0.370 0.404 0.315 0.056 2.13 40 600 10.00 2.2 0.388 0.398 0.330 0.058 2.23 41 615 10.25 1.5 0.265 0.392 0.225 0.040 1.52 42 630 10.50 1.5 0.265 0.387 0.225 0.040 1.52 43 645 10.75 2.0 0.353 0.381 0.300 0.053 2.03 44 660 11.00 2.0 0.353 0.375 0.300 0.053 2.03 45 675 11.25 1.9 0.335 0.370 0.285 0.050 1.93 46 690 11.50 1.9 0.335 0.364 0.285 0.050 1.93 47 705 11.75 1.7 0.300 0.359 0.255 0.045 1.72 48 720 12.00 1.8 0.318 0.354 0.270 0.048 1.82 49 735 12.25 2.5 0.441 0.348 0.375 0.093 3.55 50 750 12.50 2.6 0.459 0.343 0.390 0.115 4.42 51 765 12.75 2.8 0.494 0.338 0.420 0.156 5.97 52 780 13.00 2.9 0.512 0.333 0.435 0.179 6.84 53 795 13.25 3.4 0.600 0.328 0.510 0.272 10.42 54 810 13.50 3.4 0.600 0.323 0.510 0.277 10.61 55 825 13.75 2.3 0.406 0.318 0.345 0.088 3.36 56 840 14.00 2.3 0.406 0.313 0.345 0.093 3.55 57 855 14.25 2.7 0.476 0.308 0.405 0.168 6.43 58 870 14.50 2.6 0.459 0.304 0.390 0.155 5.94 59 885 14.75 2.6 0.459 0.299 0.390 0.160 6.11 60 900 15.00 2.5 0.441 0.294 0.375 0.147 5.61 61 915 15.25 2.4 0.423 0.290 0.360 0.133 5.11 62 930 15.50 2.3 0.406 0.286 0.345 0.120 4.60 63 945 15.75 1.9 0.335 0.281 0.285 0.054 2.07 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 37.990 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3751 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 THE WAVE HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 64 960 16.00 1.9 0.335 0.277 0.285 0.058 2.23 65 975 16.25 0.4 0.071 0.273 0.060 0.011 0.41 66 990 16.50 0.4 0.071 0.268 0.060 0.011 0.41 67 1005 16.75 0.3 0.053 0.264 0.045 0.008 0.30 68 1020 17.00 0.3 0.053 0.260 0.045 0.008 0.30 69 1035 17.25 0.5 0.088 0.256 0.075 0.013 0.51 70 1050 17.50 0.5 0.088 0.253 0.075 0.013 0.51 71 1065 17.75 0.5 0.088 0.249 0.075 0.013 0.51 72 1080 18.00 0.4 0.071 0.245 0.060 0.011 0.41 73 1095 18.25 0.4 0.071 0.242 0.060 0.011 0.41 74 1110 18.50 0.4 0.071 0.238 0.060 0.011 0.41 75 1125 18.75 0.3 0.053 0.235 0.045 0.008 0.30 76 1140 19.00 0.2 0.035 0.231 0.030 0.005 0.20 77 1155 19.25 0.3 0.053 0.228 0.045 0.008 0.30 78 1170 19.50 0.4 0.071 0.225 0.060 0.011 0.41 79 1185 19.75 0.3 0.053 0.222 0.045 0.008 0.30 80 1200 20.00 0.2 0.035 0.219 0.030 0.005 0.20 81 1215 20.25 0.3 0.053 0.216 0.045 0.008 0.30 82 1230 20.50 0.3 0.053 0.213 0.045 0.008 0.30 83 1245 20.75 0.3 0.053 0.210 0.045 0.008 0.30 84 1260 21.00 0.2 0.035 0.208 0.030 0.005 0.20 85 1275 21.25 0.3 0.053 0.205 0.045 0.008 0.30 86 1290 21.50 0.2 0.035 0.203 0.030 0.005 0.20 87 1305 21.75 0.3 0.053 0.201 0.045 0.008 0.30 88 1320 22.00 0.2 0.035 0.199 0.030 0.005 0.20 89 1335 22.25 0.3 0.053 0.197 0.045 0.008 0.30 90 1350 22.50 0.2 0.035 0.195 0.030 0.005 0.20 91 1365 22.75 0.2 0.035 0.193 0.030 0.005 0.20 92 1380 23.00 0.2 0.035 0.192 0.030 0.005 0.20 93 1395 23.25 0.2 0.035 0.190 0.030 0.005 0.20 94 1410 23.50 0.2 0.035 0.189 0.030 0.005 0.20 95 1425 23.75 0.2 0.035 0.188 0.030 0.005 0.20 96 1440 24.00 0.2 0.035 0.188 0.030 0.005 0.20 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)4.41 RAINFALL VOLUME (cuft)608,158 SOIL LOSSES (cuft)476,283 EFFECTIVE RAIN (in)0.96 FLOOD VOLUME (acft)3.03 FLOOD VOLUME (cuft)131,875 PEAK FLOW (cfs)10.61 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 7.768 D 56 0.51 0.90 2 B PAVING/HARDSCAPE 0.090 D 56 0.51 1.00 9 B LANDSCAPING 0.415 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 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 October 21, 2019 PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION THE WAVE FUTURE BASIN DA-H PROJECT: Job No.: BY:DATE:10/21/19 [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)43,245 64,267 82,886 132,437 SOIL LOSSES (cuft)3,448 10,345 20,467 59,161 EFFECTIVE RAIN (in)1.33 1.80 2.08 2.44 FLOOD VOLUME (cu-ft)39,797 53,922 62,419 73,276 (acre-ft)0.91 1.24 1.43 1.68 PEAK FLOW (cfs)N/A 16.61 14.51 4.18 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 [8] ELEVATION OF HEADWATER #DIV/0! 0.00 [12] S^0.5 0.000 0 [17] 100% OF LAG-MINUTES #DIV/0! #DIV/0! [14] AVERAGE MANNINGS 'N' [15] LAG TIME-HOURS #DIV/0! [16] LAG TIME-MINUTES 0 DLS 0.000 0 0 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD FUTURE BASIN DA-H THE WAVE [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. 8.273 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 Plate E-2.1 Page 2 of 9 PROJECT: Job No.: BY:DATE:10/21/19 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 7.768 0.939 0.0910 DEVELOPED 0.1800 0.1690 B 56 0.51 100%0.05 0.090 0.011 0.0006 DEVELOPED 0.1000 0.0011 B 56 0.51 10%0.46 0.415 0.050 0.0233 DEVELOPED 0.8200 0.0411 SUM 8.273 SUM 0.1148 0.2112 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.057410293 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00106 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55 =0.00106 0.06 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.1148 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 COMMERCIAL PAVING/HARDSCAPE LANDSCAPING THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 8.27 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 0.11 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 0.11 0.53 0.51 4.23 2 10 0.17 4.2 0.73 0.11 0.62 0.61 5.10 3 15 0.25 4.4 0.76 0.11 0.65 0.65 5.38 4 20 0.33 4.6 0.79 0.11 0.68 0.68 5.67 5 25 0.42 5.0 0.86 0.11 0.73 0.75 6.25 6 30 0.50 5.6 0.97 0.11 0.82 0.85 7.11 7 35 0.58 6.4 1.11 0.11 0.94 0.99 8.27 8 40 0.67 8.1 1.40 0.11 1.19 1.28 10.72 9 45 0.75 13.1 2.26 0.11 1.92 2.15 17.93 10 50 0.83 34.5 5.96 0.11 5.07 5.85 48.77 11 55 0.92 6.7 1.16 0.11 0.98 1.04 8.70 12 60 1.00 3.8 0.66 0.11 0.56 0.54 4.52 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)1.44 RAINFALL VOLUME (cuft)43,245 SOIL LOSSES (cuft)3,448 EFFECTIVE RAIN (in)1.33 FLOOD VOLUME (acft)0.91 FLOOD VOLUME (cuft)39,797 PEAK FLOW RATE (cfs)48.77 in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE HYDROLOGY SHORTCUT METHOD Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 10/21/19 DRAINAGE AREA-ACRES 8.27 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 0.11 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 0.11 0.28 0.22 1.83 2 10 0.17 1.3 0.33 0.11 0.28 0.22 1.83 3 15 0.25 1.1 0.28 0.11 0.24 0.17 1.40 4 20 0.33 1.5 0.39 0.11 0.33 0.27 2.26 5 25 0.42 1.5 0.39 0.11 0.33 0.27 2.26 6 30 0.50 1.8 0.46 0.11 0.39 0.35 2.90 7 35 0.58 1.5 0.39 0.11 0.33 0.27 2.26 8 40 0.67 1.8 0.46 0.11 0.39 0.35 2.90 9 45 0.75 1.8 0.46 0.11 0.39 0.35 2.90 10 50 0.83 1.5 0.39 0.11 0.33 0.27 2.26 11 55 0.92 1.6 0.41 0.11 0.35 0.30 2.47 12 60 1.00 1.8 0.46 0.11 0.39 0.35 2.90 13 65 1.08 2.2 0.56 0.11 0.48 0.45 3.76 14 70 1.17 2.2 0.56 0.11 0.48 0.45 3.76 15 75 1.25 2.2 0.56 0.11 0.48 0.45 3.76 16 80 1.33 2.0 0.51 0.11 0.44 0.40 3.33 17 85 1.42 2.6 0.67 0.11 0.57 0.55 4.61 18 90 1.50 2.7 0.69 0.11 0.59 0.58 4.83 19 95 1.58 2.4 0.62 0.11 0.52 0.50 4.18 20 100 1.67 2.7 0.69 0.11 0.59 0.58 4.83 21 105 1.75 3.3 0.85 0.11 0.72 0.73 6.11 22 110 1.83 3.1 0.80 0.11 0.68 0.68 5.68 23 115 1.92 2.9 0.74 0.11 0.63 0.63 5.25 24 120 2.00 3.0 0.77 0.11 0.65 0.66 5.47 25 125 2.08 3.1 0.80 0.11 0.68 0.68 5.68 26 130 2.17 4.2 1.08 0.11 0.92 0.96 8.04 27 135 2.25 5.0 1.28 0.11 1.09 1.17 9.75 28 140 2.33 3.5 0.90 0.11 0.76 0.78 6.54 29 145 2.42 6.8 1.75 0.11 1.48 1.63 13.61 30 150 2.50 7.3 1.87 0.11 1.59 1.76 14.68 31 155 2.58 8.2 2.11 0.11 1.79 1.99 16.61 32 160 2.67 5.9 1.52 0.11 1.29 1.40 11.68 33 165 2.75 2.0 0.51 0.11 0.44 0.40 3.33 34 170 2.83 1.8 0.46 0.11 0.39 0.35 2.90 35 175 2.92 1.8 0.46 0.11 0.39 0.35 2.90 36 180 3.00 0.6 0.15 0.11 0.13 0.04 0.33 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)2.14 RAINFALL VOLUME (cuft)64,267 SOIL LOSSES (cuft)10,345 EFFECTIVE RAIN (in)1.80 FLOOD VOLUME (acft)1.24 FLOOD VOLUME (cuft)53,922 PEAK FLOW RATE (cfs)16.61 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 8.27 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 0.115 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 0.11 0.14 0.05 0.42 2 10 0.17 0.6 0.199 0.11 0.17 0.08 0.70 3 15 0.25 0.6 0.199 0.11 0.17 0.08 0.70 4 20 0.33 0.6 0.199 0.11 0.17 0.08 0.70 5 25 0.42 0.6 0.199 0.11 0.17 0.08 0.70 6 30 0.50 0.7 0.232 0.11 0.20 0.12 0.98 7 35 0.58 0.7 0.232 0.11 0.20 0.12 0.98 8 40 0.67 0.7 0.232 0.11 0.20 0.12 0.98 9 45 0.75 0.7 0.232 0.11 0.20 0.12 0.98 10 50 0.83 0.7 0.232 0.11 0.20 0.12 0.98 11 55 0.92 0.7 0.232 0.11 0.20 0.12 0.98 12 60 1.00 0.8 0.265 0.11 0.23 0.15 1.25 13 65 1.08 0.8 0.265 0.11 0.23 0.15 1.25 14 70 1.17 0.8 0.265 0.11 0.23 0.15 1.25 15 75 1.25 0.8 0.265 0.11 0.23 0.15 1.25 16 80 1.33 0.8 0.265 0.11 0.23 0.15 1.25 17 85 1.42 0.8 0.265 0.11 0.23 0.15 1.25 18 90 1.50 0.8 0.265 0.11 0.23 0.15 1.25 19 95 1.58 0.8 0.265 0.11 0.23 0.15 1.25 20 100 1.67 0.8 0.265 0.11 0.23 0.15 1.25 21 105 1.75 0.8 0.265 0.11 0.23 0.15 1.25 22 110 1.83 0.8 0.265 0.11 0.23 0.15 1.25 23 115 1.92 0.8 0.265 0.11 0.23 0.15 1.25 24 120 2.00 0.9 0.298 0.11 0.25 0.18 1.53 25 125 2.08 0.8 0.265 0.11 0.23 0.15 1.25 26 130 2.17 0.9 0.298 0.11 0.25 0.18 1.53 27 135 2.25 0.9 0.298 0.11 0.25 0.18 1.53 28 140 2.33 0.9 0.298 0.11 0.25 0.18 1.53 29 145 2.42 0.9 0.298 0.11 0.25 0.18 1.53 30 150 2.50 0.9 0.298 0.11 0.25 0.18 1.53 31 155 2.58 0.9 0.298 0.11 0.25 0.18 1.53 32 160 2.67 0.9 0.298 0.11 0.25 0.18 1.53 33 165 2.75 1.0 0.331 0.11 0.28 0.22 1.81 34 170 2.83 1.0 0.331 0.11 0.28 0.22 1.81 35 175 2.92 1.0 0.331 0.11 0.28 0.22 1.81 36 180 3.00 1.0 0.331 0.11 0.28 0.22 1.81 37 185 3.08 1.0 0.331 0.11 0.28 0.22 1.81 38 190 3.17 1.1 0.364 0.11 0.31 0.25 2.08 39 195 3.25 1.1 0.364 0.11 0.31 0.25 2.08 40 200 3.33 1.1 0.364 0.11 0.31 0.25 2.08 41 205 3.42 1.2 0.397 0.11 0.34 0.28 2.36 42 210 3.50 1.3 0.431 0.11 0.37 0.32 2.63 43 215 3.58 1.4 0.464 0.11 0.39 0.35 2.91 44 220 3.67 1.4 0.464 0.11 0.39 0.35 2.91 45 225 3.75 1.5 0.497 0.11 0.42 0.38 3.19 46 230 3.83 1.5 0.497 0.11 0.42 0.38 3.19 47 235 3.92 1.6 0.530 0.11 0.45 0.42 3.46 48 240 4.00 1.6 0.530 0.11 0.45 0.42 3.46 49 245 4.08 1.7 0.563 0.11 0.48 0.45 3.74 50 250 4.17 1.8 0.596 0.11 0.51 0.48 4.02 51 255 4.25 1.9 0.629 0.11 0.53 0.51 4.29 52 260 4.33 2.0 0.662 0.11 0.56 0.55 4.57 53 265 4.42 2.1 0.696 0.11 0.59 0.58 4.84 54 270 4.50 2.1 0.696 0.11 0.59 0.58 4.84 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM THE WAVERCFC & 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 10/21/19 DRAINAGE AREA-ACRES 8.27 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 0.115 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 THE WAVERCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 55 275 4.58 2.2 0.729 0.11 0.62 0.61 5.12 56 280 4.67 2.3 0.762 0.11 0.65 0.65 5.40 57 285 4.75 2.4 0.795 0.11 0.68 0.68 5.67 58 290 4.83 2.4 0.795 0.11 0.68 0.68 5.67 59 295 4.92 2.5 0.828 0.11 0.70 0.71 5.95 60 300 5.00 2.6 0.861 0.11 0.73 0.75 6.23 61 305 5.08 3.1 1.027 0.11 0.87 0.91 7.61 62 310 5.17 3.6 1.192 0.11 1.01 1.08 8.99 63 315 5.25 3.9 1.292 0.11 1.10 1.18 9.82 64 320 5.33 4.2 1.391 0.11 1.18 1.28 10.65 65 325 5.42 4.7 1.557 0.11 1.32 1.44 12.03 66 330 5.50 5.6 1.855 0.11 1.58 1.74 14.51 67 335 5.58 1.9 0.629 0.11 0.53 0.51 4.29 68 340 5.67 0.9 0.298 0.11 0.25 0.18 1.53 69 345 5.75 0.6 0.199 0.11 0.17 0.08 0.70 70 350 5.83 0.5 0.166 0.11 0.14 0.05 0.42 71 355 5.92 0.3 0.099 0.11 0.08 0.01 0.12 72 360 6.00 0.2 0.066 0.11 0.06 0.01 0.08 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)2.76 RAINFALL VOLUME (cuft)82,886 SOIL LOSSES (cuft)20,467 EFFECTIVE RAIN (in)2.08 FLOOD VOLUME (acft)1.43 FLOOD VOLUME (cuft)62,419 PEAK FLOW RATE (cfs)14.51 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 10/21/19 DRAINAGE AREA-ACRES 8.273 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.1148 LAG TIME - MINUTES #DIV/0!MINIMUM LOSS RATE (for var. loss) - in/hr 0.057 UNIT TIME-PERCENT OF LAG #DIV/0!LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00106 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 0.203 0.030 0.005 0.04 2 30 0.50 0.3 0.053 0.200 0.045 0.008 0.07 3 45 0.75 0.3 0.053 0.198 0.045 0.008 0.07 4 60 1.00 0.4 0.071 0.196 0.060 0.011 0.09 5 75 1.25 0.3 0.053 0.193 0.045 0.008 0.07 6 90 1.50 0.3 0.053 0.191 0.045 0.008 0.07 7 105 1.75 0.3 0.053 0.189 0.045 0.008 0.07 8 120 2.00 0.4 0.071 0.187 0.060 0.011 0.09 9 135 2.25 0.4 0.071 0.184 0.060 0.011 0.09 10 150 2.50 0.4 0.071 0.182 0.060 0.011 0.09 11 165 2.75 0.5 0.088 0.180 0.075 0.013 0.11 12 180 3.00 0.5 0.088 0.178 0.075 0.013 0.11 13 195 3.25 0.5 0.088 0.175 0.075 0.013 0.11 14 210 3.50 0.5 0.088 0.173 0.075 0.013 0.11 15 225 3.75 0.5 0.088 0.171 0.075 0.013 0.11 16 240 4.00 0.6 0.106 0.169 0.090 0.016 0.13 17 255 4.25 0.6 0.106 0.167 0.090 0.016 0.13 18 270 4.50 0.7 0.123 0.165 0.105 0.019 0.15 19 285 4.75 0.7 0.123 0.163 0.105 0.019 0.15 20 300 5.00 0.8 0.141 0.160 0.120 0.021 0.18 21 315 5.25 0.6 0.106 0.158 0.090 0.016 0.13 22 330 5.50 0.7 0.123 0.156 0.105 0.019 0.15 23 345 5.75 0.8 0.141 0.154 0.120 0.021 0.18 24 360 6.00 0.8 0.141 0.152 0.120 0.021 0.18 25 375 6.25 0.9 0.159 0.150 0.135 0.009 0.07 26 390 6.50 0.9 0.159 0.148 0.135 0.011 0.09 27 405 6.75 1.0 0.176 0.146 0.150 0.030 0.25 28 420 7.00 1.0 0.176 0.144 0.150 0.032 0.27 29 435 7.25 1.0 0.176 0.142 0.150 0.034 0.28 30 450 7.50 1.1 0.194 0.140 0.165 0.054 0.45 31 465 7.75 1.2 0.212 0.138 0.180 0.073 0.61 32 480 8.00 1.3 0.229 0.137 0.195 0.093 0.77 33 495 8.25 1.5 0.265 0.135 0.225 0.130 1.08 34 510 8.50 1.5 0.265 0.133 0.225 0.132 1.10 35 525 8.75 1.6 0.282 0.131 0.240 0.151 1.26 36 540 9.00 1.7 0.300 0.129 0.255 0.171 1.43 37 555 9.25 1.9 0.335 0.127 0.285 0.208 1.73 38 570 9.50 2.0 0.353 0.125 0.300 0.227 1.90 39 585 9.75 2.1 0.370 0.124 0.315 0.247 2.06 40 600 10.00 2.2 0.388 0.122 0.330 0.266 2.22 41 615 10.25 1.5 0.265 0.120 0.225 0.145 1.21 42 630 10.50 1.5 0.265 0.118 0.225 0.146 1.22 43 645 10.75 2.0 0.353 0.117 0.300 0.236 1.97 44 660 11.00 2.0 0.353 0.115 0.300 0.238 1.98 45 675 11.25 1.9 0.335 0.113 0.285 0.222 1.85 46 690 11.50 1.9 0.335 0.112 0.285 0.224 1.87 47 705 11.75 1.7 0.300 0.110 0.255 0.190 1.58 48 720 12.00 1.8 0.318 0.108 0.270 0.209 1.75 49 735 12.25 2.5 0.441 0.107 0.375 0.334 2.79 50 750 12.50 2.6 0.459 0.105 0.390 0.354 2.95 51 765 12.75 2.8 0.494 0.103 0.420 0.390 3.26 52 780 13.00 2.9 0.512 0.102 0.435 0.410 3.42 53 795 13.25 3.4 0.600 0.100 0.510 0.499 4.17 54 810 13.50 3.4 0.600 0.099 0.510 0.501 4.18 55 825 13.75 2.3 0.406 0.097 0.345 0.308 2.57 56 840 14.00 2.3 0.406 0.096 0.345 0.310 2.58 57 855 14.25 2.7 0.476 0.094 0.405 0.382 3.19 58 870 14.50 2.6 0.459 0.093 0.390 0.366 3.05 59 885 14.75 2.6 0.459 0.092 0.390 0.367 3.06 60 900 15.00 2.5 0.441 0.090 0.375 0.351 2.93 61 915 15.25 2.4 0.423 0.089 0.360 0.335 2.79 62 930 15.50 2.3 0.406 0.087 0.345 0.318 2.66 63 945 15.75 1.9 0.335 0.086 0.285 0.249 2.08 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 8.273 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.1148 LAG TIME - MINUTES #DIV/0!MINIMUM LOSS RATE (for var. loss) - in/hr 0.057 UNIT TIME-PERCENT OF LAG #DIV/0!LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.41 C 0.00106 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 THE WAVE HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 64 960 16.00 1.9 0.335 0.085 0.285 0.250 2.09 65 975 16.25 0.4 0.071 0.083 0.060 0.011 0.09 66 990 16.50 0.4 0.071 0.082 0.060 0.011 0.09 67 1005 16.75 0.3 0.053 0.081 0.045 0.008 0.07 68 1020 17.00 0.3 0.053 0.080 0.045 0.008 0.07 69 1035 17.25 0.5 0.088 0.079 0.075 0.010 0.08 70 1050 17.50 0.5 0.088 0.077 0.075 0.011 0.09 71 1065 17.75 0.5 0.088 0.076 0.075 0.012 0.10 72 1080 18.00 0.4 0.071 0.075 0.060 0.011 0.09 73 1095 18.25 0.4 0.071 0.074 0.060 0.011 0.09 74 1110 18.50 0.4 0.071 0.073 0.060 0.011 0.09 75 1125 18.75 0.3 0.053 0.072 0.045 0.008 0.07 76 1140 19.00 0.2 0.035 0.071 0.030 0.005 0.04 77 1155 19.25 0.3 0.053 0.070 0.045 0.008 0.07 78 1170 19.50 0.4 0.071 0.069 0.060 0.002 0.01 79 1185 19.75 0.3 0.053 0.068 0.045 0.008 0.07 80 1200 20.00 0.2 0.035 0.067 0.030 0.005 0.04 81 1215 20.25 0.3 0.053 0.066 0.045 0.008 0.07 82 1230 20.50 0.3 0.053 0.065 0.045 0.008 0.07 83 1245 20.75 0.3 0.053 0.064 0.045 0.008 0.07 84 1260 21.00 0.2 0.035 0.064 0.030 0.005 0.04 85 1275 21.25 0.3 0.053 0.063 0.045 0.008 0.07 86 1290 21.50 0.2 0.035 0.062 0.030 0.005 0.04 87 1305 21.75 0.3 0.053 0.061 0.045 0.008 0.07 88 1320 22.00 0.2 0.035 0.061 0.030 0.005 0.04 89 1335 22.25 0.3 0.053 0.060 0.045 0.008 0.07 90 1350 22.50 0.2 0.035 0.060 0.030 0.005 0.04 91 1365 22.75 0.2 0.035 0.059 0.030 0.005 0.04 92 1380 23.00 0.2 0.035 0.059 0.030 0.005 0.04 93 1395 23.25 0.2 0.035 0.058 0.030 0.005 0.04 94 1410 23.50 0.2 0.035 0.058 0.030 0.005 0.04 95 1425 23.75 0.2 0.035 0.058 0.030 0.005 0.04 96 1440 24.00 0.2 0.035 0.057 0.030 0.005 0.04 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)4.41 RAINFALL VOLUME (cuft)132,437 SOIL LOSSES (cuft)59,161 EFFECTIVE RAIN (in)2.44 FLOOD VOLUME (acft)1.68 FLOOD VOLUME (cuft)73,276 PEAK FLOW (cfs)4.18 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 0.777 D 56 0.51 1.00 4 B SF - LOW DENSITY 48.790 D 56 0.51 0.30 9 B LANDSCAPING 5.087 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 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 October 21, 2019 PROJECT NUMBER CONCENTRATION POINT DESIGNATION DATE: AREA DESIGNATION THE WAVE FUTURE BASIN DA-I PROJECT: Job No.: BY:DATE:10/21/19 [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)285,689 424,565 547,570 874,921 SOIL LOSSES (cuft)74,651 214,588 333,195 685,989 EFFECTIVE RAIN (in)1.06 1.06 1.08 0.95 FLOOD VOLUME (cu-ft)211,037 209,977 214,375 188,932 (acre-ft)4.84 4.82 4.92 4.34 PEAK FLOW (cfs)N/A 95.31 81.48 15.20 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 [8] ELEVATION OF HEADWATER #DIV/0! 0.00 [12] S^0.5 0.000 0 [17] 100% OF LAG-MINUTES #DIV/0! #DIV/0! [14] AVERAGE MANNINGS 'N' [15] LAG TIME-HOURS #DIV/0! [16] LAG TIME-MINUTES 0 DLS 0.000 0 0 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD FUTURE BASIN DA-I THE WAVE [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. 54.654 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 Plate E-2.1 Page 2 of 9 PROJECT: Job No.: BY:DATE:10/21/19 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 0.777 0.014 0.0007 DEVELOPED 0.1000 0.0014 B 56 0.51 30%0.37 48.790 0.893 0.3324 DEVELOPED 0.6600 0.5892 B 56 0.51 10%0.46 5.087 0.093 0.0432 DEVELOPED 0.8200 0.0763 SUM 54.654 SUM 0.3763 0.6669 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.188138295 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00348 For 10 Year Storms or Less Ft=C(24-(T/60))^1.55 =0.00348 0.19 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.3763 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 THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 54.65 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 13.55 2 10 0.17 4.2 0.73 0.38 0.62 0.35 19.26 3 15 0.25 4.4 0.76 0.38 0.65 0.38 21.16 4 20 0.33 4.6 0.79 0.38 0.68 0.42 23.07 5 25 0.42 5.0 0.86 0.38 0.73 0.49 26.88 6 30 0.50 5.6 0.97 0.38 0.82 0.59 32.59 7 35 0.58 6.4 1.11 0.38 0.94 0.73 40.21 8 40 0.67 8.1 1.40 0.38 1.19 1.02 56.40 9 45 0.75 13.1 2.26 0.38 1.92 1.89 104.01 10 50 0.83 34.5 5.96 0.38 5.07 5.59 307.81 11 55 0.92 6.7 1.16 0.38 0.98 0.78 43.07 12 60 1.00 3.8 0.66 0.38 0.56 0.28 15.45 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)1.44 RAINFALL VOLUME (cuft)285,689 SOIL LOSSES (cuft)74,651 EFFECTIVE RAIN (in)1.06 FLOOD VOLUME (acft)4.84 FLOOD VOLUME (cuft)211,037 PEAK FLOW RATE (cfs)307.81 in/hr MANUAL 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD THE WAVE HYDROLOGY SHORTCUT METHOD Plate E-2.2 1 Hour Storm Page 4 of 9 PROJECT: Job No.:2553 DATE BY:DLS 10/21/19 DRAINAGE AREA-ACRES 54.65 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 2.76 2 10 0.17 1.3 0.33 0.38 0.28 0.05 2.76 3 15 0.25 1.1 0.28 0.38 0.24 0.04 2.34 4 20 0.33 1.5 0.39 0.38 0.33 0.01 0.49 5 25 0.42 1.5 0.39 0.38 0.33 0.01 0.49 6 30 0.50 1.8 0.46 0.38 0.39 0.09 4.74 7 35 0.58 1.5 0.39 0.38 0.33 0.01 0.49 8 40 0.67 1.8 0.46 0.38 0.39 0.09 4.74 9 45 0.75 1.8 0.46 0.38 0.39 0.09 4.74 10 50 0.83 1.5 0.39 0.38 0.33 0.01 0.49 11 55 0.92 1.6 0.41 0.38 0.35 0.03 1.91 12 60 1.00 1.8 0.46 0.38 0.39 0.09 4.74 13 65 1.08 2.2 0.56 0.38 0.48 0.19 10.40 14 70 1.17 2.2 0.56 0.38 0.48 0.19 10.40 15 75 1.25 2.2 0.56 0.38 0.48 0.19 10.40 16 80 1.33 2.0 0.51 0.38 0.44 0.14 7.57 17 85 1.42 2.6 0.67 0.38 0.57 0.29 16.06 18 90 1.50 2.7 0.69 0.38 0.59 0.32 17.47 19 95 1.58 2.4 0.62 0.38 0.52 0.24 13.23 20 100 1.67 2.7 0.69 0.38 0.59 0.32 17.47 21 105 1.75 3.3 0.85 0.38 0.72 0.47 25.97 22 110 1.83 3.1 0.80 0.38 0.68 0.42 23.14 23 115 1.92 2.9 0.74 0.38 0.63 0.37 20.30 24 120 2.00 3.0 0.77 0.38 0.65 0.39 21.72 25 125 2.08 3.1 0.80 0.38 0.68 0.42 23.14 26 130 2.17 4.2 1.08 0.38 0.92 0.70 38.70 27 135 2.25 5.0 1.28 0.38 1.09 0.91 50.02 28 140 2.33 3.5 0.90 0.38 0.76 0.52 28.80 29 145 2.42 6.8 1.75 0.38 1.48 1.37 75.50 30 150 2.50 7.3 1.87 0.38 1.59 1.50 82.57 31 155 2.58 8.2 2.11 0.38 1.79 1.73 95.31 32 160 2.67 5.9 1.52 0.38 1.29 1.14 62.76 33 165 2.75 2.0 0.51 0.38 0.44 0.14 7.57 34 170 2.83 1.8 0.46 0.38 0.39 0.09 4.74 35 175 2.92 1.8 0.46 0.38 0.39 0.09 4.74 36 180 3.00 0.6 0.15 0.38 0.13 0.02 1.27 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)2.14 RAINFALL VOLUME (cuft)424,565 SOIL LOSSES (cuft)214,588 EFFECTIVE RAIN (in)1.06 FLOOD VOLUME (acft)4.82 FLOOD VOLUME (cuft)209,977 PEAK FLOW RATE (cfs)95.31 Loss Rate in/hr Time UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 54.65 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 0.376 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 1.37 2 10 0.17 0.6 0.199 0.38 0.17 0.03 1.64 3 15 0.25 0.6 0.199 0.38 0.17 0.03 1.64 4 20 0.33 0.6 0.199 0.38 0.17 0.03 1.64 5 25 0.42 0.6 0.199 0.38 0.17 0.03 1.64 6 30 0.50 0.7 0.232 0.38 0.20 0.03 1.92 7 35 0.58 0.7 0.232 0.38 0.20 0.03 1.92 8 40 0.67 0.7 0.232 0.38 0.20 0.03 1.92 9 45 0.75 0.7 0.232 0.38 0.20 0.03 1.92 10 50 0.83 0.7 0.232 0.38 0.20 0.03 1.92 11 55 0.92 0.7 0.232 0.38 0.20 0.03 1.92 12 60 1.00 0.8 0.265 0.38 0.23 0.04 2.19 13 65 1.08 0.8 0.265 0.38 0.23 0.04 2.19 14 70 1.17 0.8 0.265 0.38 0.23 0.04 2.19 15 75 1.25 0.8 0.265 0.38 0.23 0.04 2.19 16 80 1.33 0.8 0.265 0.38 0.23 0.04 2.19 17 85 1.42 0.8 0.265 0.38 0.23 0.04 2.19 18 90 1.50 0.8 0.265 0.38 0.23 0.04 2.19 19 95 1.58 0.8 0.265 0.38 0.23 0.04 2.19 20 100 1.67 0.8 0.265 0.38 0.23 0.04 2.19 21 105 1.75 0.8 0.265 0.38 0.23 0.04 2.19 22 110 1.83 0.8 0.265 0.38 0.23 0.04 2.19 23 115 1.92 0.8 0.265 0.38 0.23 0.04 2.19 24 120 2.00 0.9 0.298 0.38 0.25 0.04 2.46 25 125 2.08 0.8 0.265 0.38 0.23 0.04 2.19 26 130 2.17 0.9 0.298 0.38 0.25 0.04 2.46 27 135 2.25 0.9 0.298 0.38 0.25 0.04 2.46 28 140 2.33 0.9 0.298 0.38 0.25 0.04 2.46 29 145 2.42 0.9 0.298 0.38 0.25 0.04 2.46 30 150 2.50 0.9 0.298 0.38 0.25 0.04 2.46 31 155 2.58 0.9 0.298 0.38 0.25 0.04 2.46 32 160 2.67 0.9 0.298 0.38 0.25 0.04 2.46 33 165 2.75 1.0 0.331 0.38 0.28 0.05 2.74 34 170 2.83 1.0 0.331 0.38 0.28 0.05 2.74 35 175 2.92 1.0 0.331 0.38 0.28 0.05 2.74 36 180 3.00 1.0 0.331 0.38 0.28 0.05 2.74 37 185 3.08 1.0 0.331 0.38 0.28 0.05 2.74 38 190 3.17 1.1 0.364 0.38 0.31 0.05 3.01 39 195 3.25 1.1 0.364 0.38 0.31 0.05 3.01 40 200 3.33 1.1 0.364 0.38 0.31 0.05 3.01 41 205 3.42 1.2 0.397 0.38 0.34 0.02 1.17 42 210 3.50 1.3 0.431 0.38 0.37 0.05 2.99 43 215 3.58 1.4 0.464 0.38 0.39 0.09 4.82 44 220 3.67 1.4 0.464 0.38 0.39 0.09 4.82 45 225 3.75 1.5 0.497 0.38 0.42 0.12 6.64 46 230 3.83 1.5 0.497 0.38 0.42 0.12 6.64 47 235 3.92 1.6 0.530 0.38 0.45 0.15 8.47 48 240 4.00 1.6 0.530 0.38 0.45 0.15 8.47 49 245 4.08 1.7 0.563 0.38 0.48 0.19 10.29 50 250 4.17 1.8 0.596 0.38 0.51 0.22 12.12 51 255 4.25 1.9 0.629 0.38 0.53 0.25 13.94 52 260 4.33 2.0 0.662 0.38 0.56 0.29 15.77 53 265 4.42 2.1 0.696 0.38 0.59 0.32 17.59 54 270 4.50 2.1 0.696 0.38 0.59 0.32 17.59 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Time Loss Rate in/hr MANUAL 6-HOUR STORM THE WAVERCFC & 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 10/21/19 DRAINAGE AREA-ACRES 54.65 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 0.376 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 THE WAVERCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 55 275 4.58 2.2 0.729 0.38 0.62 0.35 19.42 56 280 4.67 2.3 0.762 0.38 0.65 0.39 21.24 57 285 4.75 2.4 0.795 0.38 0.68 0.42 23.07 58 290 4.83 2.4 0.795 0.38 0.68 0.42 23.07 59 295 4.92 2.5 0.828 0.38 0.70 0.45 24.89 60 300 5.00 2.6 0.861 0.38 0.73 0.48 26.72 61 305 5.08 3.1 1.027 0.38 0.87 0.65 35.85 62 310 5.17 3.6 1.192 0.38 1.01 0.82 44.97 63 315 5.25 3.9 1.292 0.38 1.10 0.92 50.45 64 320 5.33 4.2 1.391 0.38 1.18 1.01 55.92 65 325 5.42 4.7 1.557 0.38 1.32 1.18 65.05 66 330 5.50 5.6 1.855 0.38 1.58 1.48 81.48 67 335 5.58 1.9 0.629 0.38 0.53 0.25 13.94 68 340 5.67 0.9 0.298 0.38 0.25 0.04 2.46 69 345 5.75 0.6 0.199 0.38 0.17 0.03 1.64 70 350 5.83 0.5 0.166 0.38 0.14 0.02 1.37 71 355 5.92 0.3 0.099 0.38 0.08 0.01 0.82 72 360 6.00 0.2 0.066 0.38 0.06 0.01 0.55 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)2.76 RAINFALL VOLUME (cuft)547,570 SOIL LOSSES (cuft)333,195 EFFECTIVE RAIN (in)1.08 FLOOD VOLUME (acft)4.92 FLOOD VOLUME (cuft)214,375 PEAK FLOW RATE (cfs)81.48 Plate E-2.2 6-Hour Storm Page 7 of 9 PROJECT: Job No.:2553 DATE: BY:DLS 10/21/19 DRAINAGE AREA-ACRES 54.654 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3763 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 0.00348 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 0.664 0.030 0.005 0.29 2 30 0.50 0.3 0.053 0.657 0.045 0.008 0.44 3 45 0.75 0.3 0.053 0.649 0.045 0.008 0.44 4 60 1.00 0.4 0.071 0.641 0.060 0.011 0.58 5 75 1.25 0.3 0.053 0.634 0.045 0.008 0.44 6 90 1.50 0.3 0.053 0.626 0.045 0.008 0.44 7 105 1.75 0.3 0.053 0.619 0.045 0.008 0.44 8 120 2.00 0.4 0.071 0.611 0.060 0.011 0.58 9 135 2.25 0.4 0.071 0.604 0.060 0.011 0.58 10 150 2.50 0.4 0.071 0.597 0.060 0.011 0.58 11 165 2.75 0.5 0.088 0.589 0.075 0.013 0.73 12 180 3.00 0.5 0.088 0.582 0.075 0.013 0.73 13 195 3.25 0.5 0.088 0.575 0.075 0.013 0.73 14 210 3.50 0.5 0.088 0.568 0.075 0.013 0.73 15 225 3.75 0.5 0.088 0.561 0.075 0.013 0.73 16 240 4.00 0.6 0.106 0.554 0.090 0.016 0.87 17 255 4.25 0.6 0.106 0.547 0.090 0.016 0.87 18 270 4.50 0.7 0.123 0.540 0.105 0.019 1.02 19 285 4.75 0.7 0.123 0.533 0.105 0.019 1.02 20 300 5.00 0.8 0.141 0.526 0.120 0.021 1.17 21 315 5.25 0.6 0.106 0.519 0.090 0.016 0.87 22 330 5.50 0.7 0.123 0.512 0.105 0.019 1.02 23 345 5.75 0.8 0.141 0.506 0.120 0.021 1.17 24 360 6.00 0.8 0.141 0.499 0.120 0.021 1.17 25 375 6.25 0.9 0.159 0.492 0.135 0.024 1.31 26 390 6.50 0.9 0.159 0.486 0.135 0.024 1.31 27 405 6.75 1.0 0.176 0.479 0.150 0.026 1.46 28 420 7.00 1.0 0.176 0.473 0.150 0.026 1.46 29 435 7.25 1.0 0.176 0.466 0.150 0.026 1.46 30 450 7.50 1.1 0.194 0.460 0.165 0.029 1.60 31 465 7.75 1.2 0.212 0.454 0.180 0.032 1.75 32 480 8.00 1.3 0.229 0.447 0.195 0.034 1.90 33 495 8.25 1.5 0.265 0.441 0.225 0.040 2.19 34 510 8.50 1.5 0.265 0.435 0.225 0.040 2.19 35 525 8.75 1.6 0.282 0.429 0.240 0.042 2.33 36 540 9.00 1.7 0.300 0.423 0.255 0.045 2.48 37 555 9.25 1.9 0.335 0.417 0.285 0.050 2.77 38 570 9.50 2.0 0.353 0.411 0.300 0.053 2.92 39 585 9.75 2.1 0.370 0.405 0.315 0.056 3.06 40 600 10.00 2.2 0.388 0.399 0.330 0.058 3.21 41 615 10.25 1.5 0.265 0.394 0.225 0.040 2.19 42 630 10.50 1.5 0.265 0.388 0.225 0.040 2.19 43 645 10.75 2.0 0.353 0.382 0.300 0.053 2.92 44 660 11.00 2.0 0.353 0.377 0.300 0.053 2.92 45 675 11.25 1.9 0.335 0.371 0.285 0.050 2.77 46 690 11.50 1.9 0.335 0.366 0.285 0.050 2.77 47 705 11.75 1.7 0.300 0.360 0.255 0.045 2.48 48 720 12.00 1.8 0.318 0.355 0.270 0.048 2.62 49 735 12.25 2.5 0.441 0.349 0.375 0.092 5.04 50 750 12.50 2.6 0.459 0.344 0.390 0.114 6.30 51 765 12.75 2.8 0.494 0.339 0.420 0.155 8.53 52 780 13.00 2.9 0.512 0.334 0.435 0.178 9.79 53 795 13.25 3.4 0.600 0.329 0.510 0.271 14.93 54 810 13.50 3.4 0.600 0.324 0.510 0.276 15.20 55 825 13.75 2.3 0.406 0.319 0.345 0.087 4.78 56 840 14.00 2.3 0.406 0.314 0.345 0.092 5.05 57 855 14.25 2.7 0.476 0.309 0.405 0.167 9.20 58 870 14.50 2.6 0.459 0.305 0.390 0.154 8.49 59 885 14.75 2.6 0.459 0.300 0.390 0.159 8.74 60 900 15.00 2.5 0.441 0.295 0.375 0.146 8.02 61 915 15.25 2.4 0.423 0.291 0.360 0.132 7.30 62 930 15.50 2.3 0.406 0.286 0.345 0.119 6.57 63 945 15.75 1.9 0.335 0.282 0.285 0.053 2.93 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD in/hr UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM THE WAVE 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 10/21/19 DRAINAGE AREA-ACRES 54.654 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3763 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 0.00348 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 THE WAVE HYDROLOGY SHORTCUT METHOD Time Loss Rate MANUAL 24-HOUR STORM 64 960 16.00 1.9 0.335 0.278 0.285 0.057 3.16 65 975 16.25 0.4 0.071 0.274 0.060 0.011 0.58 66 990 16.50 0.4 0.071 0.269 0.060 0.011 0.58 67 1005 16.75 0.3 0.053 0.265 0.045 0.008 0.44 68 1020 17.00 0.3 0.053 0.261 0.045 0.008 0.44 69 1035 17.25 0.5 0.088 0.257 0.075 0.013 0.73 70 1050 17.50 0.5 0.088 0.253 0.075 0.013 0.73 71 1065 17.75 0.5 0.088 0.250 0.075 0.013 0.73 72 1080 18.00 0.4 0.071 0.246 0.060 0.011 0.58 73 1095 18.25 0.4 0.071 0.242 0.060 0.011 0.58 74 1110 18.50 0.4 0.071 0.239 0.060 0.011 0.58 75 1125 18.75 0.3 0.053 0.235 0.045 0.008 0.44 76 1140 19.00 0.2 0.035 0.232 0.030 0.005 0.29 77 1155 19.25 0.3 0.053 0.229 0.045 0.008 0.44 78 1170 19.50 0.4 0.071 0.226 0.060 0.011 0.58 79 1185 19.75 0.3 0.053 0.222 0.045 0.008 0.44 80 1200 20.00 0.2 0.035 0.219 0.030 0.005 0.29 81 1215 20.25 0.3 0.053 0.217 0.045 0.008 0.44 82 1230 20.50 0.3 0.053 0.214 0.045 0.008 0.44 83 1245 20.75 0.3 0.053 0.211 0.045 0.008 0.44 84 1260 21.00 0.2 0.035 0.209 0.030 0.005 0.29 85 1275 21.25 0.3 0.053 0.206 0.045 0.008 0.44 86 1290 21.50 0.2 0.035 0.204 0.030 0.005 0.29 87 1305 21.75 0.3 0.053 0.201 0.045 0.008 0.44 88 1320 22.00 0.2 0.035 0.199 0.030 0.005 0.29 89 1335 22.25 0.3 0.053 0.197 0.045 0.008 0.44 90 1350 22.50 0.2 0.035 0.196 0.030 0.005 0.29 91 1365 22.75 0.2 0.035 0.194 0.030 0.005 0.29 92 1380 23.00 0.2 0.035 0.192 0.030 0.005 0.29 93 1395 23.25 0.2 0.035 0.191 0.030 0.005 0.29 94 1410 23.50 0.2 0.035 0.190 0.030 0.005 0.29 95 1425 23.75 0.2 0.035 0.189 0.030 0.005 0.29 96 1440 24.00 0.2 0.035 0.188 0.030 0.005 0.29 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY TOTAL RAINFALL (in)4.41 RAINFALL VOLUME (cuft)874,921 SOIL LOSSES (cuft)685,989 EFFECTIVE RAIN (in)0.95 FLOOD VOLUME (acft)4.34 FLOOD VOLUME (cuft)188,932 PEAK FLOW (cfs)15.20 Plate E-2.2 24 Hour Storm Page 9 of 9 The Wave at Coral Mountain Preliminary Hydrology Report Appendix G Riverside County Whitewater River Region WQMP Worksheets ATRIB = 162.171 acres Determine the Impervious Area Within ATRIB (AIMP)AIMP = 38.874 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 = 45,337 ft3 QBMP = CBMP x I x ATRIB QBMP = 6.24 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 'A' October 21, 2019 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 = 17.512 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 = 17,613 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 THE WAVE - MSA JOB #2553 DRAINAGE AREA 'B' October 21, 2019 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 = 4.419 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 = 4,423 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 THE WAVE - MSA JOB #2553 DRAINAGE AREA 'C' October 21, 2019 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 = 28.976 acres Determine the Impervious Area Within ATRIB (AIMP)AIMP = 14.177 acres Calculate the Impervious Area Ratio (IF) IF = AIMP/ATRIB IF = 0.49 Use the following equation based on the WEF/ASCE Method CBMP = 0.858If 3 - 0.78If 2 + 0.774If + 0.04 CBMP = 0.33 Calculate VU, the 80% Unit Storage Volume VU = 0.40 x CBMP VU = 0.13 (in*ac)/ac Calculate the design storage volume of the BMP, VBMP VBMP (ft3) =VBMP = 13,988 ft3 QBMP = CBMP x I x ATRIB QBMP = 1.93 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 'D' October 21, 2019 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 = 62.903 acres Determine the Impervious Area Within ATRIB (AIMP)AIMP = 19.414 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 = 20,990 ft3 QBMP = CBMP x I x ATRIB QBMP = 2.89 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 THE WAVE - MSA JOB #2553 DRAINAGE AREA 'E' October 21, 2019 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 The Wave at 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) FutureLow Density Residential (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 VIIIPlanning 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 R:\2553\ACAD\Hydrology\2553ExistingHydrologyExhibit.dwg,10/21/20199:59:09AM,dschulze,MSAConsulting,Inc. 58th Avenue NeighborhoodCommercial Future Low Density Residential (3) Future Low Density Residential (2) FutureLow Density Residential (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 VIIIPlanning 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=88.411 DA-A3 L=1,050 A=24.968 DA-A2 L=1,050 A=16.741 DA-B L=2,000 A=41.586 DA-C L=1,350 A=10.191 DA-D L=780 A=28.976 DA-E L=780 A=62.903 DA-F A=44.811 DA-G A=37.990 DA-I A=54.654 DA-H A=8.273 MSA CONSULTING, INC. 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com R:\2553\ACAD\Hydrology\Preliminary\2553PreliminaryHydrologyExhibit-SUH01.dwg,10/21/20199:48:44AM,dschulze,MSAConsulting,Inc. MSA CONSULTING, INC. 34200 Bob Hope Drive, Rancho Mirage, CA 92270 760.320.9811 msaconsultinginc.com R:\2553\ACAD\Hydrology\Preliminary\2553PreliminaryHydrologyExhibit-SUH02.dwg,10/21/20199:49:06AM,dschulze,MSAConsulting,Inc.