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HomeMy WebLinkAboutApp C Hydrology Report For Property Located in Those Portions of Section 32, T5S., R6E., SBM In the Cities of Palm Desert and Indian Wells, California The Living Desert Crossroads of Conservation Phase 3 June 23, 2023 Prepared for: The Living Desert 47900 Portola Avenue Palm Desert, CA 92260 JN: 2244 PRELIMINARY HYDROLOGY REPORT THE LIVING DESERT – PHASE 3 PRELIMINARY HYDROLOGY REPORT TABLE OF CONTENTS EXECUTIVE SUMMARY ....................................................................................................1 PROJECT LOCATION ........................................................................................................1 EXISTING SITE CONDITIONS ............................................................................................1 Flood Rate Map ...................................................................................................................... 1 PROPOSED FLOOD CONTROL REQUIREMENTS................................................................1 HYDROLOGY ANALYSIS DESIGN CRITERIA .......................................................................1 National Cooperative Soil Survey ............................................................................................ 1 Antecedent Moisture Condition .............................................................................................. 2 Land Use Classifications and Runoff Index Numbers ............................................................... 2 Precipitation Frequency Estimates .......................................................................................... 2 SYNTHETIC UNIT HYDROGRAPH (SHORTCUT METHOD) ANALYSES ................................2 RESULTS AND CONCLUSIONS ..........................................................................................3 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. RCFC&WCD SYNTHETIC UNIT HYDROGRAPH WORKSHEETS F. WQMP VOLUME WORKSHEETS G. EXISTING CONDITIONS EXHIBIT H. PRELIMINARY HYDROLOGY EXHIBIT THE LIVING DESERT – PHASE 3 PRELIMINARY HYDROLOGY REPORT 1 EXECUTIVE SUMMARY The proposed project at The Living Desert in the City of Palm Desert and City of Indian Wells consists of a new events building, new animal habitats for lions and smaller animals, and a new special events entrance. On-site storm runoff will be conveyed through sheet flows and storm drain lines to a retention basins designed to retain the incremental increase in stormwater volume resulting from the new development, with subsequent runoff following existing drainage routes. PROJECT LOCATION The proposed project site is located in The Living Desert in Sections 28, 29, 32 and 33, Township 5 South, Range 6 East, San Bernardino Base and Meridian. A vicinity map obtained from the Riverside TLMA website is included as Appendix A. EXISTING SITE CONDITIONS The subject area consists of previously developed land with various buildings and structures. Mounding on the perimeter of the surrounding areas of The Living Desert prevents offsite flows from entering the project area. The existing parking lot uses a combination of permeable pavers and storm drain catch basins to percolate storm flows into the ground or convey them to the existing 66” storm drain line running underneath the project site. On-site flows within the project site typically flow south to north and generally occur as sheet flow. Refer to Appendix H for the Existing Conditions Exhibit. Flood Rate Map The proposed (to be developed) area is covered by FIRM Panel Number 06065C2228G, revised May 2, 2013, by LOMR 12-09-314P-060254 which indicates the project area lies within Zone X (Shaded), which is 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 zones”. (Refer to the attached Flood Insurance Rate Map – Appendix B). PROPOSED FLOOD CONTROL REQUIREMENTS Drainage requirements for this project fall under the respective jurisdictions of the City of Palm Desert and the City of Indian Wells. Stormwater runoff will be conveyed via sheet flow and swales to proposed inlets and subsequently to proposed retention basins. The retention basins will be sized to retain the incremental increase in storm runoff volume, with further runoff being allowed to continue onto existing or proposed drainage routes. No new storm drain facilities will be connected directly to the existing 66” storm drain line which runs north under the existing parking lot. HYDROLOGY ANALYSIS DESIGN CRITERIA Storm run-off volumes for the 100-year event were obtained utilizing the Synthetic Unit (Shortcut Method) Hydrograph, as described in the RCFC&WCD Hydrology Manual. The shortcut method is useful for evaluating those areas less than 200 acres in size. The hydrologic data used for the calculations are as follows: National Cooperative Soil Survey The existing soil is categorized as “not rated” as shown on the attached National Cooperative Soil Survey exhibits in Appendix C. Per the Earth Systems Southwest Geotechnical Engineering and Percolation Report, File No. PID- 000166-001, Doc. No. 16-03-714, dated March 30, 2016, site “alluvial soils consist generally of well and poorly graded sands with varying amounts of silt and gravel (Universal Soils Classification System symbols of SP and THE LIVING DESERT – PHASE 3 PRELIMINARY HYDROLOGY REPORT 2 SW, SP-SM, and SW-SM).” This description matches Soil Group A, defined by RCFCD as – “those soils having high infiltration rates. These soils consist mainly of deep, well drained to excessively drained sands or gravely sands. These soils have a high rate of water transmission.” 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 Plate D-5.5 and are summarized below: Existing Conditions – Open Brush Poor 62 Proposed Conditions – Paving/Hardscape 32 Percent of Impervious Cover (RCFCD Plate E-6.3): Existing Open Brush Poor 5% Buildings/Paving/Hardscape 100% Low Loss Rates: 85% Precipitation Frequency Estimates Precipitation depths were obtained from NOAA Atlas 14: 100 Year – 1 Hour Precipitation: 1.98 inches 100 Year – 3 Hour Precipitation: 2.59 inches 100 Year - 6 Hour Precipitation 3.16 inches 100 Year – 24 Hour Precipitation 4.88 inches See Appendix D for the NOAA Atlas 14 Point Precipitation Frequency Estimates and respective RCFCD Plates. SYNTHETIC UNIT HYDROGRAPH (SHORTCUT METHOD) ANALYSES The tributary areas are considerably less than the 200-acre limit guideline for utilization of the shortcut method. It should be noted that the peak flow for the 1-hour storm is not necessarily representative for peak flow. Per RCFC&WCD, peak discharges from the 3-hour storm should normally compare well with rational peaks. Analyses performed include comparative flood volume calculations for the existing and proposed conditions based on the RCFC&WCD Synthetic Unit Hydrograph (Shortcut Method). The differentials of the results provide the anticipated worst-case incremental increase flood volume from the 100-year storm event. The synthetic unit hydrograph worksheets are included in Appendix E and the Preliminary Hydrology Exhibit is included in Appendix J, with results summarized below: THE LIVING DESERT – PHASE 3 PRELIMINARY HYDROLOGY REPORT 3 Drainage Area A (acre-ft) 0.00 0.00 0.00 0.01 Drainage Area B (acre-ft) 0.72 0.61 0.56 0.45 (acre-ft) 0.05 0.13 0.11 0.14 RESULTS AND CONCLUSIONS As demonstrated by the above narrative and appendices, the on-site storm water runoff from the 100-year storm event will be conveyed to the retention facilities, which have sufficient capacity to retain the incremental increase of flood volume from the 100-year storm. It is therefore concluded that this project conforms to the hydrologic requirements set forth by the City of Palm Desert and the City of Indian Wells. THE LIVING DESERT - PHASE 3 FINAL HYDROLOGY REPORT Appendix A Riverside County TLMA Vicinity Map *I M P O R T A N T * M a p s a n d d a t a a r e t o b e u s e d f o r r e f e r e n c e p u r p o s e s o n l y . M a p f e a t u r e s a r e a p p r o x i m a t e , a n d a r e n o t ne c e s s a r i l y a c c u r a t e t o s u r v e y i n g o r e n g i n e e r i n g s t a n d a r d s . T h e C o u n t y o f R i v e r s i d e m a k e s n o w a r r a n t y o r g u a r a n t e e as t o t h e c o n t e n t ( t h e s o u r c e i s o f t e n t h i r d p a r t y ) , a c c u r a c y , t i m e l i n e s s , o r c o m p l e t e n e s s o f a n y o f t h e d a t a p r o v i d e d , a n d as s u m e s n o l e g a l r e s p o n s i b i l i t y f o r t h e i n f o r m a t i o n c o n t a i n e d o n t h i s m a p . A n y u s e o f t h i s p r o d u c t w i t h r e s p e c t t o ac c u r a c y a n d p r e c i s i o n s h a l l b e t h e s o l e r e s p o n s i b i l i t y o f t h e u s e r . © R i v e r s i d e C o u n t y R C I T G I S 3, 7 7 8 Fe e t Le g e n d Vi c i n i t y M a p No t e s 1, 8 8 9 0 RE P O R T P R I N T E D O N . . . 8/ 2 6 / 2 0 1 6 3 : 3 1 : 0 4 P M Di s p l a y P a r c e l s Ci t y B o u n d a r i e s Ci t i e s ro a d s a n n o hi g h w a y s HW Y IN T E R C H A N G E IN T E R S T A T E OF F R A M P ON R A M P US H W Y co u n t i e s ci t i e s hy d r o g r a p h y l i n e s wa t e r b o d i e s La k e s Ri v e r s PH A S E 3 THE LIVING DESERT - PHASE 3 FINAL HYDROLOGY REPORT Appendix B NFIP Flood Insurance Rate Map PH A S E 3 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 LIVING DESERT - PHASE 3 FINAL HYDROLOGY REPORT Appendix C USDA NCSS Hydrologic Soils Map Hydrologic Soil Group—Riverside County, Coachella Valley Area, California (2244 Living Desert) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/6/2023 Page 1 of 4 37 2 8 6 0 0 37 2 8 7 0 0 37 2 8 8 0 0 37 2 8 9 0 0 37 2 9 0 0 0 37 2 9 1 0 0 37 2 9 2 0 0 37 2 9 3 0 0 37 2 8 6 0 0 37 2 8 7 0 0 37 2 8 8 0 0 37 2 8 9 0 0 37 2 9 0 0 0 37 2 9 1 0 0 37 2 9 2 0 0 37 2 9 3 0 0 557800 557900 558000 558100 558200 558300 557800 557900 558000 558100 558200 558300 33° 42' 10'' N 11 6 ° 2 2 ' 3 7 ' ' W 33° 42' 10'' N 11 6 ° 2 2 ' 1 3 ' ' W 33° 41' 44'' N 11 6 ° 2 2 ' 3 7 ' ' W 33° 41' 44'' N 11 6 ° 2 2 ' 1 3 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 0 150 300 600 900 Feet 0 50 100 200 300 Meters Map Scale: 1:3,990 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 14, Sep 1, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 15, 2022—May 28, 2022 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 (2244 Living Desert) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/6/2023 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 17.0 27.6% RA Riverwash 40.8 66.3% RO Rock outcrop 3.7 6.0% Totals for Area of Interest 61.6 100.0% 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. Hydrologic Soil Group—Riverside County, Coachella Valley Area, California 2244 Living Desert Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/6/2023 Page 3 of 4 Rating Options Aggregation Method: Dominant Condition Aggregation is the process by which a set of component attribute values is reduced to a single value that represents the map unit as a whole. A map unit is typically composed of one or more "components". A component is either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute being aggregated, the first step of the aggregation process is to derive one attribute value for each of a map unit's components. From this set of component attributes, the next step of the aggregation process derives a single value that represents the map unit as a whole. Once a single value for each map unit is derived, a thematic map for soil map units can be rendered. Aggregation must be done because, on any soil map, map units are delineated but components are not. For each of a map unit's components, a corresponding percent composition is recorded. A percent composition of 60 indicates that the corresponding component typically makes up approximately 60% of the map unit. Percent composition is a critical factor in some, but not all, aggregation methods. The aggregation method "Dominant Condition" first groups like attribute values for the components in a map unit. For each group, percent composition is set to the sum of the percent composition of all components participating in that group. These groups now represent "conditions" rather than components. The attribute value associated with the group with the highest cumulative percent composition is returned. If more than one group shares the highest cumulative percent composition, the corresponding "tie-break" rule determines which value should be returned. The "tie-break" rule indicates whether the lower or higher group value should be returned in the case of a percent composition tie. The result returned by this aggregation method represents the dominant condition throughout the map unit only when no tie has occurred. Component Percent Cutoff: None Specified Components whose percent composition is below the cutoff value will not be considered. If no cutoff value is specified, all components in the database will be considered. The data for some contrasting soils of minor extent may not be in the database, and therefore are not considered. Tie-break Rule: Higher The tie-break rule indicates which value should be selected from a set of multiple candidate values, or which value should be selected in the event of a percent composition tie. Hydrologic Soil Group—Riverside County, Coachella Valley Area, California 2244 Living Desert Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 6/6/2023 Page 4 of 4 THE LIVING DESERT - PHASE 3 FINAL HYDROLOGY REPORT Appendix D NOAA Atlas 14 RCFCD Reference Plates NOAA Atlas 14, Volume 6, Version 2 Location name: Indian Wells, California, US* Latitude: 33.6992°, Longitude: -116.3739° Elevation: 382 ft* * source: Google Maps 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 0.075 (0.063-0.091) 0.115 (0.096-0.140) 0.178 (0.148-0.216) 0.238 (0.196-0.291) 0.335 (0.267-0.425) 0.424 (0.331-0.550) 0.530 (0.403-0.704) 0.657 (0.485-0.898) 0.864 (0.611-1.23) 1.06 (0.724-1.57) 10-min 0.108 (0.090-0.131) 0.165 (0.138-0.200) 0.255 (0.212-0.310) 0.341 (0.281-0.417) 0.480 (0.382-0.609) 0.608 (0.474-0.788) 0.760 (0.578-1.01) 0.941 (0.696-1.29) 1.24 (0.876-1.77) 1.52 (1.04-2.24) 15-min 0.131 (0.109-0.158) 0.200 (0.167-0.242) 0.308 (0.256-0.374) 0.412 (0.340-0.505) 0.581 (0.463-0.736) 0.735 (0.573-0.953) 0.919 (0.699-1.22) 1.14 (0.841-1.56) 1.50 (1.06-2.14) 1.84 (1.25-2.71) 30-min 0.196 (0.164-0.238) 0.300 (0.250-0.364) 0.463 (0.385-0.563) 0.619 (0.511-0.759) 0.873 (0.696-1.11) 1.11 (0.862-1.43) 1.38 (1.05-1.84) 1.71 (1.27-2.34) 2.25 (1.59-3.21) 2.76 (1.89-4.08) 60-min 0.281 (0.234-0.340) 0.429 (0.358-0.520) 0.662 (0.551-0.805) 0.885 (0.730-1.09) 1.25 (0.994-1.58) 1.58 (1.23-2.05) 1.98 (1.50-2.62) 2.45 (1.81-3.35) 3.22 (2.28-4.59) 3.95 (2.70-5.83) 2-hr 0.388 (0.324-0.469) 0.569 (0.475-0.689) 0.848 (0.705-1.03) 1.11 (0.915-1.36) 1.53 (1.22-1.93) 1.90 (1.48-2.46) 2.33 (1.77-3.10) 2.84 (2.10-3.88) 3.64 (2.58-5.20) 4.38 (2.99-6.47) 3-hr 0.458 (0.383-0.554) 0.664 (0.553-0.804) 0.976 (0.811-1.19) 1.27 (1.04-1.55) 1.72 (1.37-2.18) 2.13 (1.66-2.76) 2.59 (1.97-3.44) 3.13 (2.31-4.28) 3.98 (2.82-5.67) 4.74 (3.24-7.00) 6-hr 0.592 (0.495-0.717) 0.852 (0.710-1.03) 1.24 (1.03-1.51) 1.59 (1.31-1.95) 2.14 (1.71-2.71) 2.62 (2.04-3.39) 3.16 (2.40-4.20) 3.78 (2.79-5.17) 4.73 (3.35-6.75) 5.57 (3.80-8.23) 12-hr 0.722 (0.603-0.873) 1.06 (0.882-1.28) 1.55 (1.29-1.89) 2.00 (1.64-2.44) 2.67 (2.13-3.38) 3.24 (2.53-4.20) 3.89 (2.96-5.16) 4.61 (3.41-6.31) 5.71 (4.04-8.14) 6.65 (4.54-9.83) 24-hr 0.875 (0.774-1.01) 1.32 (1.16-1.52) 1.95 (1.72-2.26) 2.52 (2.20-2.94) 3.37 (2.85-4.06) 4.09 (3.39-5.02) 4.88 (3.96-6.14) 5.76 (4.55-7.45) 7.08 (5.37-9.53) 8.21 (6.02-11.4) 2-day 1.01 (0.889-1.16) 1.53 (1.36-1.77) 2.30 (2.03-2.66) 2.98 (2.61-3.48) 4.00 (3.39-4.82) 4.86 (4.04-5.97) 5.81 (4.71-7.31) 6.87 (5.43-8.88) 8.46 (6.42-11.4) 9.81 (7.20-13.6) 3-day 1.08 (0.952-1.24) 1.65 (1.46-1.91) 2.49 (2.20-2.89) 3.24 (2.83-3.78) 4.36 (3.69-5.25) 5.31 (4.41-6.52) 6.36 (5.15-8.00) 7.53 (5.95-9.73) 9.29 (7.05-12.5) 10.8 (7.92-15.0) 4-day 1.15 (1.01-1.32) 1.76 (1.56-2.03) 2.66 (2.35-3.08) 3.46 (3.03-4.04) 4.66 (3.95-5.61) 5.68 (4.72-6.98) 6.81 (5.52-8.56) 8.07 (6.37-10.4) 9.96 (7.56-13.4) 11.6 (8.50-16.1) 7-day 1.22 (1.08-1.41) 1.88 (1.66-2.17) 2.84 (2.50-3.28) 3.69 (3.23-4.30) 4.97 (4.21-5.98) 6.05 (5.02-7.44) 7.25 (5.88-9.12) 8.58 (6.78-11.1) 10.6 (8.02-14.2) 12.3 (9.01-17.1) 10-day 1.26 (1.11-1.45) 1.94 (1.71-2.23) 2.93 (2.58-3.39) 3.81 (3.33-4.45) 5.14 (4.35-6.19) 6.26 (5.20-7.69) 7.49 (6.07-9.42) 8.86 (6.99-11.5) 10.9 (8.27-14.7) 12.6 (9.28-17.6) 20-day 1.36 (1.21-1.57) 2.13 (1.88-2.46) 3.26 (2.87-3.77) 4.26 (3.72-4.97) 5.75 (4.87-6.93) 7.01 (5.82-8.62) 8.38 (6.80-10.5) 9.91 (7.82-12.8) 12.1 (9.21-16.3) 14.0 (10.3-19.5) 30-day 1.49 (1.32-1.72) 2.36 (2.08-2.72) 3.64 (3.20-4.21) 4.77 (4.17-5.57) 6.47 (5.48-7.79) 7.89 (6.55-9.69) 9.42 (7.64-11.9) 11.1 (8.77-14.4) 13.6 (10.3-18.3) 15.6 (11.5-21.7) 45-day 1.61 (1.42-1.86) 2.60 (2.30-3.00) 4.04 (3.56-4.68) 5.33 (4.66-6.22) 7.25 (6.14-8.73) 8.86 (7.35-10.9) 10.6 (8.58-13.3) 12.5 (9.84-16.1) 15.2 (11.5-20.4) 17.4 (12.8-24.2) 60-day 1.72 (1.52-1.99) 2.82 (2.49-3.26) 4.43 (3.91-5.13) 5.87 (5.13-6.84) 7.99 (6.77-9.63) 9.77 (8.11-12.0) 11.7 (9.47-14.7) 13.7 (10.8-17.8) 16.7 (12.7-22.5) 19.1 (14.0-26.6) 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. Back to Top PF graphical Page 1 of 4Precipitation Frequency Data Serve 8 26 201http://dipper.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=33.6992&lon=-116.3739&... Back to Top Maps & aerials Small scale terrain Map data ©2016 Google, INEGIReport a map error50 km  Page 2 of 4Precipitation Frequency Data Serve 8 26 201http://dipper.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=33.6992&lon=-116.3739&... Large scale terrai Large scale map Large scale aerial Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Ma data ©2016 Goo leReport a map error2 km  Map data ©2016 GoogleReport a map error2 km  Imagery ©2016 TerraMetricsReport a map error2 km  Page 3 of 4Precipitation Frequency Data Serve 8 26 201http://dipper.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=33.6992&lon=-116.3739&... Questions?: HDSC.Questions@noaa.gov Disclaimer Page 4 of 4Precipitation Frequency Data Serve 8 26 201http://dipper.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=33.6992&lon=-116.3739&... THE LIVING DESERT - PHASE 3 FINAL HYDROLOGY REPORT Appendix E RCFC&WCD Synthetic Unit Hydrograph Worksheets INCREMENTAL INCREASE WORKSHEET RRR 2244 2 AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 A PAVING/HARDSCAPE 0.730 D 32 0.74 1.00 9 A LANDSCAPING 2.930 D 32 0.74 0.10 AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 A PAVING/HARDSCAPE 0.810 D 32 0.74 1.00 9 A LANDSCAPING 2.790 D 32 0.74 0.10 UNDEVELOPED DEVELOPED 672 ft 661 ft 343 ft 340 ft 389.0 ft 389.0 ft ELEVATION OF CONCENTRATION POINT 371.6 ft 371.6 ft 0.018 0.018 100 LOW LOSS RATE (Storm Events > 10 Years)85.00% POINT RAIN FROM NOAA ATLAS 1-HOUR 1.98 in 3-HOUR 2.59 in 6-HOUR 3.16 in 24-HOUR 4.88 in BASIN CHARACTERISTICS:ELEVATION AREA 368.0 ft 428 sf 369.0 ft 696 sf 370.0 ft 1,022 sf PERCOLATION RATE 2.0 in/hr NUMBER USED 0 PERCOLATION RATE 0.00 cfs LOWEST FLOWLINE ELEVATION 371.60 ft LOWEST PAD ELEVATION 378.3 ft RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD Low Loss Conditions: X=Existing; D=Developed; BS=Retention PROPOSED CONDITIONS EXISTING CONDITIONS PROJECT: Job No.: BY:DATE:6/23/23 [1] AMC [2] FREQUENCY-YEARS NOAA ATLAS [3] STORM DURATION: 1-HOUR 3-HOUR 6-HOUR EFFECTIVE RAIN (in)1.43 1.08 1.00 0.71 1.44 1.12 1.03 0.75 FLOOD VOLUME (cu-ft)18,948 14,373 13,320 9,468 18,837 14,588 13,485 9,772 (acre-ft)0.43 0.33 0.31 0.22 0.43 0.33 0.31 0.22 PEAK FLOW (cfs)N/A 7.36 5.79 0.69 N/A 7.30 5.75 0.73 (cu-ft)18,837 14,588 13,485 9,772 (cu-ft)18,948 14,373 13,320 9,468 (cu-ft)-111 215 165 304 (cu-ft)1,557 1,825 2,272 4,473 (cu-ft)17,280 12,763 11,213 5,299 (ac-ft)0.40 0.29 0.26 0.12 MAXIMUM WSEL (ft)369.98 369.98 369.98 369.95 1.98 1.98 1.98 1.95 LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION ESTIMATED TIME TO DEWATER BASIN Based on total Flood Volume & RAINFALL DATA 0 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD PHYSICAL DATA HYDROLOGY MANUAL RRR STORM EVENT SUMMARY DEVELOPED CONDITIONUNDEVELOPED CONDITION STORM EVENT SUMMARY DEVELOPED CONDITION FLOOD VOLUME UNDEVELOPED CONDITION FLOOD VOLUME THE 3-HOUR STORM PEAK DISCHARGES SHOULD NORMALLY COMPARE WELL WITH (days)0.4 0.5 0.6 1.3 INCREMENTAL INCREASE IN FLOOD VOLUME TOTAL FLOOD VOLUME RETAINED TOTAL BASIN OUTFLOW PROJECT: Job No.: BY:DATE:6/23/23 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] A 32 0.74 100%0.07 0.730 0.199 0.0148 DEVELOPED 0.1000 0.0199 A 32 0.74 10%0.67 2.930 0.801 0.5391 DEVELOPED 0.8200 0.6564 SUM 3.660 SUM 0.5538 0.6764 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.27692377 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00513 For 2, 5 & 10 Year Storm Events Ft=C(24-(T/60))^1.55 =0.00513 0.28 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.5538 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. AVERAGE ADJUSTED LOSS RATE - UNDEVELOPED CONDITIONS RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM Living Desert - Crossroads Phase 3 RRR 2244 AMC II PROJECT: Job No.:2244 DATE BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.66 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 UNIT TIME-PERCENT OF LAG 303.8 TOTAL ADJUSTED STORM RAIN-INCHES 1.98 CONSTANT LOSS RATE-in/hr 0.55 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 0.86 0.55 0.73 0.30 1.11 2 10 0.17 4.2 1.00 0.55 0.85 0.44 1.64 3 15 0.25 4.4 1.05 0.55 0.89 0.49 1.81 4 20 0.33 4.6 1.09 0.55 0.93 0.54 1.99 5 25 0.42 5.0 1.19 0.55 1.01 0.63 2.34 6 30 0.50 5.6 1.33 0.55 1.13 0.78 2.87 7 35 0.58 6.4 1.52 0.55 1.29 0.97 3.57 8 40 0.67 8.1 1.92 0.55 1.64 1.37 5.06 9 45 0.75 13.1 3.11 0.55 2.65 2.56 9.44 10 50 0.83 34.5 8.20 0.55 6.97 7.64 28.21 11 55 0.92 6.7 1.59 0.55 1.35 1.04 3.83 12 60 1.00 3.8 0.90 0.55 0.77 0.35 1.29 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.43 FLOOD VOLUME (acft)0.43 FLOOD VOLUME (cuft)18,948 PEAK FLOW RATE (cfs)28.21 MANUAL UNDEVELOPED CONDITION 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY PROJECT: Job No.:2244 DATE BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.66 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 UNIT TIME-PERCENT OF LAG 303.8 TOTAL ADJUSTED STORM RAIN-INCHES 2.59 CONSTANT LOSS RATE-in/hr 0.55 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 0.40 0.55 0.34 0.06 0.22 2 10 0.17 1.3 0.40 0.55 0.34 0.06 0.22 3 15 0.25 1.1 0.34 0.55 0.29 0.05 0.19 4 20 0.33 1.5 0.47 0.55 0.40 0.07 0.26 5 25 0.42 1.5 0.47 0.55 0.40 0.07 0.26 6 30 0.50 1.8 0.56 0.55 0.48 0.01 0.02 7 35 0.58 1.5 0.47 0.55 0.40 0.07 0.26 8 40 0.67 1.8 0.56 0.55 0.48 0.01 0.02 9 45 0.75 1.8 0.56 0.55 0.48 0.01 0.02 10 50 0.83 1.5 0.47 0.55 0.40 0.07 0.26 11 55 0.92 1.6 0.50 0.55 0.42 0.07 0.28 12 60 1.00 1.8 0.56 0.55 0.48 0.01 0.02 13 65 1.08 2.2 0.68 0.55 0.58 0.13 0.48 14 70 1.17 2.2 0.68 0.55 0.58 0.13 0.48 15 75 1.25 2.2 0.68 0.55 0.58 0.13 0.48 16 80 1.33 2.0 0.62 0.55 0.53 0.07 0.25 17 85 1.42 2.6 0.81 0.55 0.69 0.25 0.94 18 90 1.50 2.7 0.84 0.55 0.71 0.29 1.05 19 95 1.58 2.4 0.75 0.55 0.63 0.19 0.71 20 100 1.67 2.7 0.84 0.55 0.71 0.29 1.05 21 105 1.75 3.3 1.03 0.55 0.87 0.47 1.74 22 110 1.83 3.1 0.96 0.55 0.82 0.41 1.51 23 115 1.92 2.9 0.90 0.55 0.77 0.35 1.28 24 120 2.00 3.0 0.93 0.55 0.79 0.38 1.40 25 125 2.08 3.1 0.96 0.55 0.82 0.41 1.51 26 130 2.17 4.2 1.31 0.55 1.11 0.75 2.77 27 135 2.25 5.0 1.55 0.55 1.32 1.00 3.69 28 140 2.33 3.5 1.09 0.55 0.92 0.53 1.97 29 145 2.42 6.8 2.11 0.55 1.80 1.56 5.76 30 150 2.50 7.3 2.27 0.55 1.93 1.71 6.33 31 155 2.58 8.2 2.55 0.55 2.17 1.99 7.36 32 160 2.67 5.9 1.83 0.55 1.56 1.28 4.72 33 165 2.75 2.0 0.62 0.55 0.53 0.07 0.25 34 170 2.83 1.8 0.56 0.55 0.48 0.01 0.02 35 175 2.92 1.8 0.56 0.55 0.48 0.01 0.02 36 180 3.00 0.6 0.19 0.55 0.16 0.03 0.10 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.08 FLOOD VOLUME (acft)0.33 FLOOD VOLUME (cuft)14,373 PEAK FLOW RATE (cfs)7.36 RCFC & WCD HYDROLOGY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD UNDEVELOPED CONDITION 3-HOUR STORM PROJECT: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.66 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 UNIT TIME-PERCENT OF LAG 303.8 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 CONSTANT LOSS RATE-in/hr 0.554 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 0.190 0.55 0.16 0.03 0.10 2 10 0.17 0.6 0.228 0.55 0.19 0.03 0.13 3 15 0.25 0.6 0.228 0.55 0.19 0.03 0.13 4 20 0.33 0.6 0.228 0.55 0.19 0.03 0.13 5 25 0.42 0.6 0.228 0.55 0.19 0.03 0.13 6 30 0.50 0.7 0.265 0.55 0.23 0.04 0.15 7 35 0.58 0.7 0.265 0.55 0.23 0.04 0.15 8 40 0.67 0.7 0.265 0.55 0.23 0.04 0.15 9 45 0.75 0.7 0.265 0.55 0.23 0.04 0.15 10 50 0.83 0.7 0.265 0.55 0.23 0.04 0.15 11 55 0.92 0.7 0.265 0.55 0.23 0.04 0.15 12 60 1.00 0.8 0.303 0.55 0.26 0.05 0.17 13 65 1.08 0.8 0.303 0.55 0.26 0.05 0.17 14 70 1.17 0.8 0.303 0.55 0.26 0.05 0.17 15 75 1.25 0.8 0.303 0.55 0.26 0.05 0.17 16 80 1.33 0.8 0.303 0.55 0.26 0.05 0.17 17 85 1.42 0.8 0.303 0.55 0.26 0.05 0.17 18 90 1.50 0.8 0.303 0.55 0.26 0.05 0.17 19 95 1.58 0.8 0.303 0.55 0.26 0.05 0.17 20 100 1.67 0.8 0.303 0.55 0.26 0.05 0.17 21 105 1.75 0.8 0.303 0.55 0.26 0.05 0.17 22 110 1.83 0.8 0.303 0.55 0.26 0.05 0.17 23 115 1.92 0.8 0.303 0.55 0.26 0.05 0.17 24 120 2.00 0.9 0.341 0.55 0.29 0.05 0.19 25 125 2.08 0.8 0.303 0.55 0.26 0.05 0.17 26 130 2.17 0.9 0.341 0.55 0.29 0.05 0.19 27 135 2.25 0.9 0.341 0.55 0.29 0.05 0.19 28 140 2.33 0.9 0.341 0.55 0.29 0.05 0.19 29 145 2.42 0.9 0.341 0.55 0.29 0.05 0.19 30 150 2.50 0.9 0.341 0.55 0.29 0.05 0.19 31 155 2.58 0.9 0.341 0.55 0.29 0.05 0.19 32 160 2.67 0.9 0.341 0.55 0.29 0.05 0.19 33 165 2.75 1.0 0.379 0.55 0.32 0.06 0.21 34 170 2.83 1.0 0.379 0.55 0.32 0.06 0.21 35 175 2.92 1.0 0.379 0.55 0.32 0.06 0.21 36 180 3.00 1.0 0.379 0.55 0.32 0.06 0.21 37 185 3.08 1.0 0.379 0.55 0.32 0.06 0.21 38 190 3.17 1.1 0.417 0.55 0.35 0.06 0.23 39 195 3.25 1.1 0.417 0.55 0.35 0.06 0.23 40 200 3.33 1.1 0.417 0.55 0.35 0.06 0.23 41 205 3.42 1.2 0.455 0.55 0.39 0.07 0.25 42 210 3.50 1.3 0.493 0.55 0.42 0.07 0.27 43 215 3.58 1.4 0.531 0.55 0.45 0.08 0.29 44 220 3.67 1.4 0.531 0.55 0.45 0.08 0.29 45 225 3.75 1.5 0.569 0.55 0.48 0.01 0.06 46 230 3.83 1.5 0.569 0.55 0.48 0.01 0.06 47 235 3.92 1.6 0.607 0.55 0.52 0.05 0.20 48 240 4.00 1.6 0.607 0.55 0.52 0.05 0.20 49 245 4.08 1.7 0.645 0.55 0.55 0.09 0.34 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD MANUAL UNDEVELOPED CONDITION 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Undeveloped 6 Hour Storm PROJECT: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.66 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 UNIT TIME-PERCENT OF LAG 303.8 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 CONSTANT LOSS RATE-in/hr 0.554 85% Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD MANUAL UNDEVELOPED CONDITION 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 52 260 4.33 2.0 0.758 0.55 0.64 0.20 0.75 53 265 4.42 2.1 0.796 0.55 0.68 0.24 0.89 54 270 4.50 2.1 0.796 0.55 0.68 0.24 0.89 55 275 4.58 2.2 0.834 0.55 0.71 0.28 1.03 56 280 4.67 2.3 0.872 0.55 0.74 0.32 1.17 57 285 4.75 2.4 0.910 0.55 0.77 0.36 1.31 58 290 4.83 2.4 0.910 0.55 0.77 0.36 1.31 59 295 4.92 2.5 0.948 0.55 0.81 0.39 1.45 60 300 5.00 2.6 0.986 0.55 0.84 0.43 1.59 61 305 5.08 3.1 1.176 0.55 1.00 0.62 2.29 62 310 5.17 3.6 1.365 0.55 1.16 0.81 2.99 63 315 5.25 3.9 1.479 0.55 1.26 0.93 3.41 64 320 5.33 4.2 1.593 0.55 1.35 1.04 3.83 65 325 5.42 4.7 1.782 0.55 1.51 1.23 4.53 66 330 5.50 5.6 2.124 0.55 1.80 1.57 5.79 67 335 5.58 1.9 0.720 0.55 0.61 0.17 0.61 68 340 5.67 0.9 0.341 0.55 0.29 0.05 0.19 69 345 5.75 0.6 0.228 0.55 0.19 0.03 0.13 70 350 5.83 0.5 0.190 0.55 0.16 0.03 0.10 71 355 5.92 0.3 0.114 0.55 0.10 0.02 0.06 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.00 FLOOD VOLUME (acft)0.31 FLOOD VOLUME (cuft)13,320 PEAK FLOW RATE (cfs)5.79 Undeveloped 6 Hour Storm PROJECT: Job No.:2244 DATE: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.660 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.5538 LAG TIME - MINUTES 1.65 MINIMUM LOSS RATE (for var. loss) - in/hr 0.277 911.3 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 C 0.00513 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 0.039 0.978 0.033 0.006 0.02 2 30 0.50 0.3 0.059 0.967 0.050 0.009 0.03 3 45 0.75 0.3 0.059 0.955 0.050 0.009 0.03 4 60 1.00 0.4 0.078 0.944 0.066 0.012 0.04 5 75 1.25 0.3 0.059 0.933 0.050 0.009 0.03 6 90 1.50 0.3 0.059 0.922 0.050 0.009 0.03 7 105 1.75 0.3 0.059 0.911 0.050 0.009 0.03 8 120 2.00 0.4 0.078 0.900 0.066 0.012 0.04 9 135 2.25 0.4 0.078 0.889 0.066 0.012 0.04 10 150 2.50 0.4 0.078 0.878 0.066 0.012 0.04 11 165 2.75 0.5 0.098 0.868 0.083 0.015 0.05 12 180 3.00 0.5 0.098 0.857 0.083 0.015 0.05 13 195 3.25 0.5 0.098 0.846 0.083 0.015 0.05 14 210 3.50 0.5 0.098 0.836 0.083 0.015 0.05 15 225 3.75 0.5 0.098 0.825 0.083 0.015 0.05 16 240 4.00 0.6 0.117 0.815 0.100 0.018 0.06 17 255 4.25 0.6 0.117 0.805 0.100 0.018 0.06 18 270 4.50 0.7 0.137 0.794 0.116 0.020 0.08 19 285 4.75 0.7 0.137 0.784 0.116 0.020 0.08 20 300 5.00 0.8 0.156 0.774 0.133 0.023 0.09 21 315 5.25 0.6 0.117 0.764 0.100 0.018 0.06 22 330 5.50 0.7 0.137 0.754 0.116 0.020 0.08 23 345 5.75 0.8 0.156 0.744 0.133 0.023 0.09 24 360 6.00 0.8 0.156 0.734 0.133 0.023 0.09 25 375 6.25 0.9 0.176 0.725 0.149 0.026 0.10 26 390 6.50 0.9 0.176 0.715 0.149 0.026 0.10 27 405 6.75 1.0 0.195 0.705 0.166 0.029 0.11 28 420 7.00 1.0 0.195 0.696 0.166 0.029 0.11 29 435 7.25 1.0 0.195 0.686 0.166 0.029 0.11 30 450 7.50 1.1 0.215 0.677 0.183 0.032 0.12 31 465 7.75 1.2 0.234 0.668 0.199 0.035 0.13 32 480 8.00 1.3 0.254 0.659 0.216 0.038 0.14 33 495 8.25 1.5 0.293 0.649 0.249 0.044 0.16 34 510 8.50 1.5 0.293 0.640 0.249 0.044 0.16 35 525 8.75 1.6 0.312 0.631 0.265 0.047 0.17 36 540 9.00 1.7 0.332 0.622 0.282 0.050 0.18 37 555 9.25 1.9 0.371 0.614 0.315 0.056 0.21 38 570 9.50 2.0 0.390 0.605 0.332 0.059 0.22 39 585 9.75 2.1 0.410 0.596 0.348 0.061 0.23 40 600 10.00 2.2 0.429 0.588 0.365 0.064 0.24 41 615 10.25 1.5 0.293 0.579 0.249 0.044 0.16 42 630 10.50 1.5 0.293 0.571 0.249 0.044 0.16 43 645 10.75 2.0 0.390 0.562 0.332 0.059 0.22 44 660 11.00 2.0 0.390 0.554 0.332 0.059 0.22 45 675 11.25 1.9 0.371 0.546 0.315 0.056 0.21 46 690 11.50 1.9 0.371 0.538 0.315 0.056 0.21 47 705 11.75 1.7 0.332 0.530 0.282 0.050 0.18 48 720 12.00 1.8 0.351 0.522 0.299 0.053 0.19 49 735 12.25 2.5 0.488 0.514 0.415 0.073 0.27 50 750 12.50 2.6 0.508 0.507 0.431 0.001 0.00 51 765 12.75 2.8 0.547 0.499 0.465 0.047 0.18 52 780 13.00 2.9 0.566 0.492 0.481 0.075 0.27 53 795 13.25 3.4 0.664 0.484 0.564 0.180 0.66 54 810 13.50 3.4 0.664 0.477 0.564 0.187 0.69 55 825 13.75 2.3 0.449 0.470 0.382 0.067 0.25 56 840 14.00 2.3 0.449 0.462 0.382 0.067 0.25 57 855 14.25 2.7 0.527 0.455 0.448 0.072 0.26 58 870 14.50 2.6 0.508 0.448 0.431 0.059 0.22 59 885 14.75 2.6 0.508 0.442 0.431 0.066 0.24 UNDEVELOPED CONDITION 24-HOUR STORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM HYDROLOGY SHORTCUT METHOD MANUAL PROJECT: Job No.:2244 DATE: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.660 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.5538 LAG TIME - MINUTES 1.65 MINIMUM LOSS RATE (for var. loss) - in/hr 0.277 911.3 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 C 0.00513 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow UNDEVELOPED CONDITION 24-HOUR STORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM HYDROLOGY SHORTCUT METHOD MANUAL 62 930 15.50 2.3 0.449 0.422 0.382 0.027 0.10 63 945 15.75 1.9 0.371 0.415 0.315 0.056 0.21 64 960 16.00 1.9 0.371 0.409 0.315 0.056 0.21 65 975 16.25 0.4 0.078 0.403 0.066 0.012 0.04 66 990 16.50 0.4 0.078 0.396 0.066 0.012 0.04 67 1005 16.75 0.3 0.059 0.390 0.050 0.009 0.03 68 1020 17.00 0.3 0.059 0.385 0.050 0.009 0.03 69 1035 17.25 0.5 0.098 0.379 0.083 0.015 0.05 70 1050 17.50 0.5 0.098 0.373 0.083 0.015 0.05 71 1065 17.75 0.5 0.098 0.367 0.083 0.015 0.05 72 1080 18.00 0.4 0.078 0.362 0.066 0.012 0.04 73 1095 18.25 0.4 0.078 0.357 0.066 0.012 0.04 74 1110 18.50 0.4 0.078 0.352 0.066 0.012 0.04 75 1125 18.75 0.3 0.059 0.346 0.050 0.009 0.03 76 1140 19.00 0.2 0.039 0.341 0.033 0.006 0.02 77 1155 19.25 0.3 0.059 0.337 0.050 0.009 0.03 78 1170 19.50 0.4 0.078 0.332 0.066 0.012 0.04 79 1185 19.75 0.3 0.059 0.327 0.050 0.009 0.03 80 1200 20.00 0.2 0.039 0.323 0.033 0.006 0.02 81 1215 20.25 0.3 0.059 0.319 0.050 0.009 0.03 82 1230 20.50 0.3 0.059 0.315 0.050 0.009 0.03 83 1245 20.75 0.3 0.059 0.311 0.050 0.009 0.03 84 1260 21.00 0.2 0.039 0.307 0.033 0.006 0.02 85 1275 21.25 0.3 0.059 0.303 0.050 0.009 0.03 86 1290 21.50 0.2 0.039 0.300 0.033 0.006 0.02 87 1305 21.75 0.3 0.059 0.297 0.050 0.009 0.03 88 1320 22.00 0.2 0.039 0.293 0.033 0.006 0.02 89 1335 22.25 0.3 0.059 0.291 0.050 0.009 0.03 90 1350 22.50 0.2 0.039 0.288 0.033 0.006 0.02 91 1365 22.75 0.2 0.039 0.285 0.033 0.006 0.02 92 1380 23.00 0.2 0.039 0.283 0.033 0.006 0.02 93 1395 23.25 0.2 0.039 0.281 0.033 0.006 0.02 94 1410 23.50 0.2 0.039 0.279 0.033 0.006 0.02 95 1425 23.75 0.2 0.039 0.278 0.033 0.006 0.02 96 1440 24.00 0.2 0.039 0.277 0.033 0.006 0.02 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)0.71 FLOOD VOLUME (acft)0.22 FLOOD VOLUME (cuft)9,468 PEAK FLOW (cfs)0.69 PROJECT: Job No.: BY:DATE:6/23/23 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] A 32 0.74 100%0.07 0.810 0.225 0.0167 DEVELOPED 0.1000 0.0225 A 32 0.74 10%0.67 2.790 0.775 0.5219 DEVELOPED 0.8200 0.6355 SUM 3.600 SUM 0.5385 0.6580 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.2692675 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00499 For Storms Less than the 100 Year Event Ft=C(24-(T/60))^1.55 =0.00499 0.27 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.5385 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. MANUAL AMC II RRR AVERAGE ADJUSTED LOSS RATE - DEVELOPED CONDITIONS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Living Desert - Crossroads Phase 3 HYDROLOGY Plate E-2.1 PROJECT: Job No.:2244 DATE BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.60 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 UNIT TIME-PERCENT OF LAG 303.8 TOTAL ADJUSTED STORM RAIN-INCHES 1.98 CONSTANT LOSS RATE-in/hr 0.54 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 0.86 0.54 0.73 0.32 1.15 2 10 0.17 4.2 1.00 0.54 0.85 0.46 1.67 3 15 0.25 4.4 1.05 0.54 0.89 0.51 1.84 4 20 0.33 4.6 1.09 0.54 0.93 0.55 2.01 5 25 0.42 5.0 1.19 0.54 1.01 0.65 2.36 6 30 0.50 5.6 1.33 0.54 1.13 0.79 2.88 7 35 0.58 6.4 1.52 0.54 1.29 0.98 3.57 8 40 0.67 8.1 1.92 0.54 1.64 1.39 5.03 9 45 0.75 13.1 3.11 0.54 2.65 2.57 9.34 10 50 0.83 34.5 8.20 0.54 6.97 7.66 27.80 11 55 0.92 6.7 1.59 0.54 1.35 1.05 3.82 12 60 1.00 3.8 0.90 0.54 0.77 0.36 1.32 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.44 FLOOD VOLUME (acft)0.43 FLOOD VOLUME (cuft)18,837 PEAK FLOW RATE (cfs)27.80 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY MANUAL DEVELOPED CONDITIONS 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM PROJECT: Job No.:2244 DATE BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.60 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.63 UNIT TIME-PERCENT OF LAG 307.7 TOTAL ADJUSTED STORM RAIN-INCHES 2.59 CONSTANT LOSS RATE-in/hr 0.54 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 0.40 0.54 0.34 0.06 0.22 2 10 0.17 1.3 0.40 0.54 0.34 0.06 0.22 3 15 0.25 1.1 0.34 0.54 0.29 0.05 0.19 4 20 0.33 1.5 0.47 0.54 0.40 0.07 0.25 5 25 0.42 1.5 0.47 0.54 0.40 0.07 0.25 6 30 0.50 1.8 0.56 0.54 0.48 0.02 0.08 7 35 0.58 1.5 0.47 0.54 0.40 0.07 0.25 8 40 0.67 1.8 0.56 0.54 0.48 0.02 0.08 9 45 0.75 1.8 0.56 0.54 0.48 0.02 0.08 10 50 0.83 1.5 0.47 0.54 0.40 0.07 0.25 11 55 0.92 1.6 0.50 0.54 0.42 0.07 0.27 12 60 1.00 1.8 0.56 0.54 0.48 0.02 0.08 13 65 1.08 2.2 0.68 0.54 0.58 0.15 0.53 14 70 1.17 2.2 0.68 0.54 0.58 0.15 0.53 15 75 1.25 2.2 0.68 0.54 0.58 0.15 0.53 16 80 1.33 2.0 0.62 0.54 0.53 0.08 0.30 17 85 1.42 2.6 0.81 0.54 0.69 0.27 0.98 18 90 1.50 2.7 0.84 0.54 0.71 0.30 1.09 19 95 1.58 2.4 0.75 0.54 0.63 0.21 0.75 20 100 1.67 2.7 0.84 0.54 0.71 0.30 1.09 21 105 1.75 3.3 1.03 0.54 0.87 0.49 1.77 22 110 1.83 3.1 0.96 0.54 0.82 0.42 1.54 23 115 1.92 2.9 0.90 0.54 0.77 0.36 1.32 24 120 2.00 3.0 0.93 0.54 0.79 0.39 1.43 25 125 2.08 3.1 0.96 0.54 0.82 0.42 1.54 26 130 2.17 4.2 1.31 0.54 1.11 0.77 2.78 27 135 2.25 5.0 1.55 0.54 1.32 1.02 3.69 28 140 2.33 3.5 1.09 0.54 0.92 0.55 1.99 29 145 2.42 6.8 2.11 0.54 1.80 1.57 5.72 30 150 2.50 7.3 2.27 0.54 1.93 1.73 6.28 31 155 2.58 8.2 2.55 0.54 2.17 2.01 7.30 32 160 2.67 5.9 1.83 0.54 1.56 1.30 4.70 33 165 2.75 2.0 0.62 0.54 0.53 0.08 0.30 34 170 2.83 1.8 0.56 0.54 0.48 0.02 0.08 35 175 2.92 1.8 0.56 0.54 0.48 0.02 0.08 36 180 3.00 0.6 0.19 0.54 0.16 0.03 0.10 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.12 FLOOD VOLUME (acft)0.33 FLOOD VOLUME (cuft)14,588 PEAK FLOW RATE (cfs)7.30 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY MANUAL DEVELOPED CONDITIONS 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM PROJECT: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.60 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.63 UNIT TIME-PERCENT OF LAG 307.7 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 CONSTANT LOSS RATE-in/hr 0.539 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 0.190 0.54 0.16 0.03 0.10 2 10 0.17 0.6 0.228 0.54 0.19 0.03 0.12 3 15 0.25 0.6 0.228 0.54 0.19 0.03 0.12 4 20 0.33 0.6 0.228 0.54 0.19 0.03 0.12 5 25 0.42 0.6 0.228 0.54 0.19 0.03 0.12 6 30 0.50 0.7 0.265 0.54 0.23 0.04 0.14 7 35 0.58 0.7 0.265 0.54 0.23 0.04 0.14 8 40 0.67 0.7 0.265 0.54 0.23 0.04 0.14 9 45 0.75 0.7 0.265 0.54 0.23 0.04 0.14 10 50 0.83 0.7 0.265 0.54 0.23 0.04 0.14 11 55 0.92 0.7 0.265 0.54 0.23 0.04 0.14 12 60 1.00 0.8 0.303 0.54 0.26 0.05 0.17 13 65 1.08 0.8 0.303 0.54 0.26 0.05 0.17 14 70 1.17 0.8 0.303 0.54 0.26 0.05 0.17 15 75 1.25 0.8 0.303 0.54 0.26 0.05 0.17 16 80 1.33 0.8 0.303 0.54 0.26 0.05 0.17 17 85 1.42 0.8 0.303 0.54 0.26 0.05 0.17 18 90 1.50 0.8 0.303 0.54 0.26 0.05 0.17 19 95 1.58 0.8 0.303 0.54 0.26 0.05 0.17 20 100 1.67 0.8 0.303 0.54 0.26 0.05 0.17 21 105 1.75 0.8 0.303 0.54 0.26 0.05 0.17 22 110 1.83 0.8 0.303 0.54 0.26 0.05 0.17 23 115 1.92 0.8 0.303 0.54 0.26 0.05 0.17 24 120 2.00 0.9 0.341 0.54 0.29 0.05 0.19 25 125 2.08 0.8 0.303 0.54 0.26 0.05 0.17 26 130 2.17 0.9 0.341 0.54 0.29 0.05 0.19 27 135 2.25 0.9 0.341 0.54 0.29 0.05 0.19 28 140 2.33 0.9 0.341 0.54 0.29 0.05 0.19 29 145 2.42 0.9 0.341 0.54 0.29 0.05 0.19 30 150 2.50 0.9 0.341 0.54 0.29 0.05 0.19 31 155 2.58 0.9 0.341 0.54 0.29 0.05 0.19 32 160 2.67 0.9 0.341 0.54 0.29 0.05 0.19 33 165 2.75 1.0 0.379 0.54 0.32 0.06 0.21 34 170 2.83 1.0 0.379 0.54 0.32 0.06 0.21 35 175 2.92 1.0 0.379 0.54 0.32 0.06 0.21 36 180 3.00 1.0 0.379 0.54 0.32 0.06 0.21 37 185 3.08 1.0 0.379 0.54 0.32 0.06 0.21 38 190 3.17 1.1 0.417 0.54 0.35 0.06 0.23 39 195 3.25 1.1 0.417 0.54 0.35 0.06 0.23 40 200 3.33 1.1 0.417 0.54 0.35 0.06 0.23 41 205 3.42 1.2 0.455 0.54 0.39 0.07 0.25 42 210 3.50 1.3 0.493 0.54 0.42 0.07 0.27 43 215 3.58 1.4 0.531 0.54 0.45 0.08 0.29 44 220 3.67 1.4 0.531 0.54 0.45 0.08 0.29 45 225 3.75 1.5 0.569 0.54 0.48 0.03 0.11 46 230 3.83 1.5 0.569 0.54 0.48 0.03 0.11 47 235 3.92 1.6 0.607 0.54 0.52 0.07 0.25 48 240 4.00 1.6 0.607 0.54 0.52 0.07 0.25 49 245 4.08 1.7 0.645 0.54 0.55 0.11 0.39 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD MANUAL DEVELOPED CONDITIONS 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM Developed 6 Hour Storm PROJECT: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.60 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.63 UNIT TIME-PERCENT OF LAG 307.7 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 CONSTANT LOSS RATE-in/hr 0.539 85% Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD MANUAL DEVELOPED CONDITIONS 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 52 260 4.33 2.0 0.758 0.54 0.64 0.22 0.80 53 265 4.42 2.1 0.796 0.54 0.68 0.26 0.94 54 270 4.50 2.1 0.796 0.54 0.68 0.26 0.94 55 275 4.58 2.2 0.834 0.54 0.71 0.30 1.07 56 280 4.67 2.3 0.872 0.54 0.74 0.33 1.21 57 285 4.75 2.4 0.910 0.54 0.77 0.37 1.35 58 290 4.83 2.4 0.910 0.54 0.77 0.37 1.35 59 295 4.92 2.5 0.948 0.54 0.81 0.41 1.49 60 300 5.00 2.6 0.986 0.54 0.84 0.45 1.62 61 305 5.08 3.1 1.176 0.54 1.00 0.64 2.31 62 310 5.17 3.6 1.365 0.54 1.16 0.83 3.00 63 315 5.25 3.9 1.479 0.54 1.26 0.94 3.41 64 320 5.33 4.2 1.593 0.54 1.35 1.05 3.83 65 325 5.42 4.7 1.782 0.54 1.51 1.24 4.51 66 330 5.50 5.6 2.124 0.54 1.80 1.58 5.75 67 335 5.58 1.9 0.720 0.54 0.61 0.18 0.66 68 340 5.67 0.9 0.341 0.54 0.29 0.05 0.19 69 345 5.75 0.6 0.228 0.54 0.19 0.03 0.12 70 350 5.83 0.5 0.190 0.54 0.16 0.03 0.10 71 355 5.92 0.3 0.114 0.54 0.10 0.02 0.06 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.03 FLOOD VOLUME (acft)0.31 FLOOD VOLUME (cuft)13,485 PEAK FLOW RATE (cfs)5.75 Developed 6 Hour Storm PROJECT: Job No.:2244 DATE: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.60 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.5385 LAG TIME - MINUTES 1.63 MINIMUM LOSS RATE (for var. loss) - in/hr 0.269 923.0 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 C 0.00499 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 0.039 0.951 0.033 0.006 0.02 2 30 0.50 0.3 0.059 0.940 0.050 0.009 0.03 3 45 0.75 0.3 0.059 0.929 0.050 0.009 0.03 4 60 1.00 0.4 0.078 0.918 0.066 0.012 0.04 5 75 1.25 0.3 0.059 0.907 0.050 0.009 0.03 6 90 1.50 0.3 0.059 0.896 0.050 0.009 0.03 7 105 1.75 0.3 0.059 0.886 0.050 0.009 0.03 8 120 2.00 0.4 0.078 0.875 0.066 0.012 0.04 9 135 2.25 0.4 0.078 0.865 0.066 0.012 0.04 10 150 2.50 0.4 0.078 0.854 0.066 0.012 0.04 11 165 2.75 0.5 0.098 0.844 0.083 0.015 0.05 12 180 3.00 0.5 0.098 0.833 0.083 0.015 0.05 13 195 3.25 0.5 0.098 0.823 0.083 0.015 0.05 14 210 3.50 0.5 0.098 0.813 0.083 0.015 0.05 15 225 3.75 0.5 0.098 0.802 0.083 0.015 0.05 16 240 4.00 0.6 0.117 0.792 0.100 0.018 0.06 17 255 4.25 0.6 0.117 0.782 0.100 0.018 0.06 18 270 4.50 0.7 0.137 0.772 0.116 0.020 0.07 19 285 4.75 0.7 0.137 0.762 0.116 0.020 0.07 20 300 5.00 0.8 0.156 0.753 0.133 0.023 0.09 21 315 5.25 0.6 0.117 0.743 0.100 0.018 0.06 22 330 5.50 0.7 0.137 0.733 0.116 0.020 0.07 23 345 5.75 0.8 0.156 0.724 0.133 0.023 0.09 24 360 6.00 0.8 0.156 0.714 0.133 0.023 0.09 25 375 6.25 0.9 0.176 0.705 0.149 0.026 0.10 26 390 6.50 0.9 0.176 0.695 0.149 0.026 0.10 27 405 6.75 1.0 0.195 0.686 0.166 0.029 0.11 28 420 7.00 1.0 0.195 0.677 0.166 0.029 0.11 29 435 7.25 1.0 0.195 0.667 0.166 0.029 0.11 30 450 7.50 1.1 0.215 0.658 0.183 0.032 0.12 31 465 7.75 1.2 0.234 0.649 0.199 0.035 0.13 32 480 8.00 1.3 0.254 0.640 0.216 0.038 0.14 33 495 8.25 1.5 0.293 0.631 0.249 0.044 0.16 34 510 8.50 1.5 0.293 0.623 0.249 0.044 0.16 35 525 8.75 1.6 0.312 0.614 0.265 0.047 0.17 36 540 9.00 1.7 0.332 0.605 0.282 0.050 0.18 37 555 9.25 1.9 0.371 0.597 0.315 0.056 0.20 38 570 9.50 2.0 0.390 0.588 0.332 0.059 0.21 39 585 9.75 2.1 0.410 0.580 0.348 0.061 0.22 40 600 10.00 2.2 0.429 0.571 0.365 0.064 0.23 41 615 10.25 1.5 0.293 0.563 0.249 0.044 0.16 42 630 10.50 1.5 0.293 0.555 0.249 0.044 0.16 43 645 10.75 2.0 0.390 0.547 0.332 0.059 0.21 44 660 11.00 2.0 0.390 0.539 0.332 0.059 0.21 45 675 11.25 1.9 0.371 0.531 0.315 0.056 0.20 46 690 11.50 1.9 0.371 0.523 0.315 0.056 0.20 47 705 11.75 1.7 0.332 0.515 0.282 0.050 0.18 48 720 12.00 1.8 0.351 0.508 0.299 0.053 0.19 49 735 12.25 2.5 0.488 0.500 0.415 0.073 0.27 50 750 12.50 2.6 0.508 0.493 0.431 0.015 0.05 51 765 12.75 2.8 0.547 0.485 0.465 0.061 0.22 52 780 13.00 2.9 0.566 0.478 0.481 0.088 0.32 53 795 13.25 3.4 0.664 0.471 0.564 0.193 0.70 54 810 13.50 3.4 0.664 0.464 0.564 0.200 0.73 55 825 13.75 2.3 0.449 0.457 0.382 0.067 0.24 56 840 14.00 2.3 0.449 0.450 0.382 0.067 0.24 57 855 14.25 2.7 0.527 0.443 0.448 0.084 0.31 58 870 14.50 2.6 0.508 0.436 0.431 0.072 0.26 59 885 14.75 2.6 0.508 0.429 0.431 0.078 0.28 60 900 15.00 2.5 0.488 0.423 0.415 0.065 0.24 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD MANUAL DEVELOPED CONDITION 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM PROJECT: Job No.:2244 DATE: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 3.60 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.5385 LAG TIME - MINUTES 1.63 MINIMUM LOSS RATE (for var. loss) - in/hr 0.269 923.0 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 C 0.00499 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 HYDROLOGY SHORTCUT METHOD MANUAL DEVELOPED CONDITION 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM 63 945 15.75 1.9 0.371 0.404 0.315 0.056 0.20 64 960 16.00 1.9 0.371 0.398 0.315 0.056 0.20 65 975 16.25 0.4 0.078 0.391 0.066 0.012 0.04 66 990 16.50 0.4 0.078 0.385 0.066 0.012 0.04 67 1005 16.75 0.3 0.059 0.380 0.050 0.009 0.03 68 1020 17.00 0.3 0.059 0.374 0.050 0.009 0.03 69 1035 17.25 0.5 0.098 0.368 0.083 0.015 0.05 70 1050 17.50 0.5 0.098 0.363 0.083 0.015 0.05 71 1065 17.75 0.5 0.098 0.357 0.083 0.015 0.05 72 1080 18.00 0.4 0.078 0.352 0.066 0.012 0.04 73 1095 18.25 0.4 0.078 0.347 0.066 0.012 0.04 74 1110 18.50 0.4 0.078 0.342 0.066 0.012 0.04 75 1125 18.75 0.3 0.059 0.337 0.050 0.009 0.03 76 1140 19.00 0.2 0.039 0.332 0.033 0.006 0.02 77 1155 19.25 0.3 0.059 0.327 0.050 0.009 0.03 78 1170 19.50 0.4 0.078 0.323 0.066 0.012 0.04 79 1185 19.75 0.3 0.059 0.318 0.050 0.009 0.03 80 1200 20.00 0.2 0.039 0.314 0.033 0.006 0.02 81 1215 20.25 0.3 0.059 0.310 0.050 0.009 0.03 82 1230 20.50 0.3 0.059 0.306 0.050 0.009 0.03 83 1245 20.75 0.3 0.059 0.302 0.050 0.009 0.03 84 1260 21.00 0.2 0.039 0.298 0.033 0.006 0.02 85 1275 21.25 0.3 0.059 0.295 0.050 0.009 0.03 86 1290 21.50 0.2 0.039 0.292 0.033 0.006 0.02 87 1305 21.75 0.3 0.059 0.288 0.050 0.009 0.03 88 1320 22.00 0.2 0.039 0.285 0.033 0.006 0.02 89 1335 22.25 0.3 0.059 0.282 0.050 0.009 0.03 90 1350 22.50 0.2 0.039 0.280 0.033 0.006 0.02 91 1365 22.75 0.2 0.039 0.277 0.033 0.006 0.02 92 1380 23.00 0.2 0.039 0.275 0.033 0.006 0.02 93 1395 23.25 0.2 0.039 0.273 0.033 0.006 0.02 94 1410 23.50 0.2 0.039 0.272 0.033 0.006 0.02 95 1425 23.75 0.2 0.039 0.270 0.033 0.006 0.02 96 1440 24.00 0.2 0.039 0.269 0.033 0.006 0.02 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)0.75 FLOOD VOLUME (acft)0.22 FLOOD VOLUME (cuft)9,772 PEAK FLOW (cfs)0.73 DRAINAGE AREA CONCENTRATION POINT DRAINAGE AREA-ACRES 3.60 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 DRYWELLS UNIT TIME-PERCENT OF LAG 303.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.98 DRYWELL PERCOLATION RATE 0.00 cfs Unit Time Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs 1 5 0.08 0.32 1.15 345 345 594 8 8 337 0.01 368.61 0 0.00 2 10 0.17 0.46 1.67 500 837 803 11 11 826 0.02 369.32 0 0.00 3 15 0.25 0.51 1.84 552 1,378 1,010 14 14 1,364 0.03 369.95 0 0.00 4 20 0.33 0.55 2.01 604 1,410 1,022 14 14 1,396 0.03 369.98 557 1.86 5 25 0.42 0.65 2.36 707 1,410 1,022 14 14 1,396 0.03 369.98 693 2.31 6 30 0.50 0.79 2.88 863 1,410 1,022 14 14 1,396 0.03 369.98 848 2.83 7 35 0.58 0.98 3.57 1,070 1,410 1,022 14 14 1,396 0.03 369.98 1,055 3.52 8 40 0.67 1.39 5.03 1,509 1,410 1,022 14 14 1,396 0.03 369.98 1,495 4.98 9 45 0.75 2.57 9.34 2,803 1,410 1,022 14 14 1,396 0.03 369.98 2,789 9.30 10 50 0.83 7.66 27.80 8,340 1,410 1,022 14 14 1,396 0.03 369.98 8,326 27.75 11 55 0.92 1.05 3.82 1,147 1,410 1,022 14 14 1,396 0.03 369.98 1,133 3.78 12 60 1.00 0.36 1.32 397 1,410 1,022 14 14 1,396 0.03 369.98 383 1.28 EFFECTIVE RAIN 1.44 in 0.43 acft 18,837 cuft TOTAL VOLUME RETAINED 1,557 cuft MAX WSEL 369.98 ft PEAK FLOW RATE 27.80 cfs AVERAGE PERCOLATION RATE 2.69 cf/min 17,280 cuft 57.60 cfs 8,326 cuft 27.75 cfs BASIN WORKSHEET SUMMARY PROJECT:RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 1 HOUR STORM Plate E-2.2 Incremental 1 Hour Storm PROJECT: DRAINAGE AREA-ACRES 3.60 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 DRYWELLS UNIT TIME-PERCENT OF LAG 303.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 2.59 0.00 cfs Unit Time Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out 1 5 0.08 0.06 0.2 66 66 460 6 6 60 0.00 368.11 0 0.00 2 10 0.17 0.06 0.2 66 126 488 7 7 119 0.00 368.21 0 0.00 3 15 0.25 0.05 0.2 56 175 512 7 7 168 0.00 368.30 0 0.00 4 20 0.33 0.07 0.3 76 244 545 8 8 236 0.01 368.42 0 0.00 5 25 0.42 0.07 0.3 76 312 578 8 8 304 0.01 368.55 0 0.00 6 30 0.50 0.02 0.1 23 327 585 8 8 319 0.01 368.57 0 0.00 7 35 0.58 0.07 0.3 76 395 618 9 9 386 0.01 368.69 0 0.00 8 40 0.67 0.02 0.1 23 409 625 9 9 401 0.01 368.72 0 0.00 9 45 0.75 0.02 0.1 23 423 632 9 9 415 0.01 368.74 0 0.00 10 50 0.83 0.07 0.3 76 491 664 9 9 481 0.01 368.87 0 0.00 11 55 0.92 0.07 0.3 81 563 698 10 10 553 0.01 368.99 0 0.00 12 60 1.00 0.02 0.1 23 576 703 10 10 566 0.01 369.01 0 0.00 13 65 1.08 0.15 0.5 158 724 760 11 11 714 0.02 369.18 0 0.00 14 70 1.17 0.15 0.5 158 872 816 11 11 860 0.02 369.36 0 0.00 15 75 1.25 0.15 0.5 158 1,019 872 12 12 1,006 0.02 369.53 0 0.00 16 80 1.33 0.08 0.3 90 1,097 902 13 13 1,084 0.02 369.62 0 0.00 17 85 1.42 0.27 1.0 294 1,378 1,010 14 14 1,364 0.03 369.95 0 0.00 18 90 1.50 0.30 1.1 327 1,410 1,022 14 14 1,396 0.03 369.98 281 0.94 19 95 1.58 0.21 0.8 226 1,410 1,022 14 14 1,396 0.03 369.98 212 0.71 20 100 1.67 0.30 1.1 327 1,410 1,022 14 14 1,396 0.03 369.98 313 1.04 21 105 1.75 0.49 1.8 530 1,410 1,022 14 14 1,396 0.03 369.98 516 1.72 22 110 1.83 0.42 1.5 463 1,410 1,022 14 14 1,396 0.03 369.98 449 1.50 23 115 1.92 0.36 1.3 395 1,410 1,022 14 14 1,396 0.03 369.98 381 1.27 24 120 2.00 0.39 1.4 429 1,410 1,022 14 14 1,396 0.03 369.98 415 1.38 25 125 2.08 0.42 1.5 463 1,410 1,022 14 14 1,396 0.03 369.98 449 1.50 26 130 2.17 0.77 2.8 835 1,410 1,022 14 14 1,396 0.03 369.98 821 2.74 27 135 2.25 1.02 3.7 1,106 1,410 1,022 14 14 1,396 0.03 369.98 1,092 3.64 28 140 2.33 0.55 2.0 598 1,410 1,022 14 14 1,396 0.03 369.98 584 1.95 29 145 2.42 1.57 5.7 1,715 1,410 1,022 14 14 1,396 0.03 369.98 1,701 5.67 30 150 2.50 1.73 6.3 1,884 1,410 1,022 14 14 1,396 0.03 369.98 1,870 6.23 31 155 2.58 2.01 7.3 2,189 1,410 1,022 14 14 1,396 0.03 369.98 2,175 7.25 32 160 2.67 1.30 4.7 1,410 1,410 1,022 14 14 1,396 0.03 369.98 1,396 4.65 33 165 2.75 0.08 0.3 90 1,410 1,022 14 14 1,396 0.03 369.98 76 0.25 34 170 2.83 0.02 0.1 23 1,410 1,022 14 14 1,396 0.03 369.98 9 0.03 35 175 2.92 0.02 0.1 23 1,410 1,022 14 14 1,396 0.03 369.98 9 0.03 369.98 16 0.05 EFFECTIVE RAIN TOTAL VOLUME RETAINED MAX WSEL PEAK FLOW RATE AVERAGE PERCOLATION RATE BASIN WORKSHEET SUMMARY RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 3 HOUR STORM Incremental 3 Hour Storm PROJECT: 6/23/23 DRAINAGE AREA-ACRES 3.60 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 DRYWELLS UNIT TIME-PERCENT OF LAG 303.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs 1 5 0.08 0.03 0.10 31 31 443 6 6 25 0.00 368.04 0 0.00 2 10 0.17 0.03 0.12 37 62 458 6 6 56 0.00 368.10 0 0.00 3 15 0.25 0.03 0.12 37 93 473 7 7 86 0.00 368.15 0 0.00 4 20 0.33 0.03 0.12 37 123 487 7 7 117 0.00 368.21 0 0.00 5 25 0.42 0.03 0.12 37 154 502 7 7 147 0.00 368.26 0 0.00 6 30 0.50 0.04 0.14 43 190 520 7 7 183 0.00 368.33 0 0.00 7 35 0.58 0.04 0.14 43 226 537 7 7 219 0.01 368.39 0 0.00 8 40 0.67 0.04 0.14 43 262 554 8 8 255 0.01 368.46 0 0.00 9 45 0.75 0.04 0.14 43 298 571 8 8 290 0.01 368.52 0 0.00 10 50 0.83 0.04 0.14 43 333 588 8 8 325 0.01 368.58 0 0.00 11 55 0.92 0.04 0.14 43 368 605 8 8 360 0.01 368.65 0 0.00 12 60 1.00 0.05 0.17 50 410 625 9 9 401 0.01 368.72 0 0.00 13 65 1.08 0.05 0.17 50 451 645 9 9 442 0.01 368.79 0 0.00 14 70 1.17 0.05 0.17 50 491 664 9 9 482 0.01 368.87 0 0.00 15 75 1.25 0.05 0.17 50 531 684 9 9 522 0.01 368.94 0 0.00 16 80 1.33 0.05 0.17 50 571 702 10 10 562 0.01 369.01 0 0.00 17 85 1.42 0.05 0.17 50 611 717 10 10 601 0.01 369.05 0 0.00 18 90 1.50 0.05 0.17 50 651 732 10 10 641 0.01 369.10 0 0.00 MANUAL RCFC & WCD HYDROLOGY SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITION BASIN STAGE STORAGE - 6 HOUR STORM Plate E-2.2 Incremental 6 Hour Storm PROJECT: 6/23/23 DRAINAGE AREA-ACRES 3.60 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 DRYWELLS UNIT TIME-PERCENT OF LAG 303.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs MANUAL RCFC & WCD HYDROLOGY SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITION BASIN STAGE STORAGE - 6 HOUR STORM 21 105 1.75 0.05 0.17 50 768 777 11 11 758 0.02 369.24 0 0.00 22 110 1.83 0.05 0.17 50 807 792 11 11 796 0.02 369.28 0 0.00 23 115 1.92 0.05 0.17 50 846 806 11 11 835 0.02 369.33 0 0.00 24 120 2.00 0.05 0.19 56 890 823 11 11 879 0.02 369.38 0 0.00 25 125 2.08 0.05 0.17 50 928 838 12 12 917 0.02 369.42 0 0.00 26 130 2.17 0.05 0.19 56 973 855 12 12 961 0.02 369.47 0 0.00 27 135 2.25 0.05 0.19 56 1,016 872 12 12 1,004 0.02 369.52 0 0.00 28 140 2.33 0.05 0.19 56 1,060 888 12 12 1,048 0.02 369.58 0 0.00 29 145 2.42 0.05 0.19 56 1,103 905 13 13 1,091 0.03 369.63 0 0.00 30 150 2.50 0.05 0.19 56 1,147 921 13 13 1,134 0.03 369.68 0 0.00 31 155 2.58 0.05 0.19 56 1,190 938 13 13 1,177 0.03 369.73 0 0.00 32 160 2.67 0.05 0.19 56 1,232 954 13 13 1,219 0.03 369.78 0 0.00 33 165 2.75 0.06 0.21 62 1,281 973 14 14 1,268 0.03 369.83 0 0.00 34 170 2.83 0.06 0.21 62 1,329 991 14 14 1,316 0.03 369.89 0 0.00 35 175 2.92 0.06 0.21 62 1,378 1,009 14 14 1,364 0.03 369.95 0 0.00 36 180 3.00 0.06 0.21 62 1,410 1,022 14 14 1,396 0.03 369.98 15 0.05 37 185 3.08 0.06 0.21 62 1,410 1,022 14 14 1,396 0.03 369.98 48 0.16 38 190 3.17 0.06 0.23 68 1,410 1,022 14 14 1,396 0.03 369.98 54 0.18 39 195 3.25 0.06 0.23 68 1,410 1,022 14 14 1,396 0.03 369.98 54 0.18 40 200 3.33 0.06 0.23 68 1,410 1,022 14 14 1,396 0.03 369.98 54 0.18 41 205 3.42 0.07 0.25 74 1,410 1,022 14 14 1,396 0.03 369.98 60 0.20 42 210 3.50 0.07 0.27 81 1,410 1,022 14 14 1,396 0.03 369.98 66 0.22 43 215 3.58 0.08 0.29 87 1,410 1,022 14 14 1,396 0.03 369.98 73 0.24 44 220 3.67 0.08 0.29 87 1,410 1,022 14 14 1,396 0.03 369.98 73 0.24 45 225 3.75 0.03 0.11 33 1,410 1,022 14 14 1,396 0.03 369.98 19 0.06 46 230 3.83 0.03 0.11 33 1,410 1,022 14 14 1,396 0.03 369.98 19 0.06 47 235 3.92 0.07 0.25 74 1,410 1,022 14 14 1,396 0.03 369.98 60 0.20 48 240 4.00 0.07 0.25 74 1,410 1,022 14 14 1,396 0.03 369.98 60 0.20 49 245 4.08 0.11 0.39 116 1,410 1,022 14 14 1,396 0.03 369.98 101 0.34 50 250 4.17 0.14 0.52 157 1,410 1,022 14 14 1,396 0.03 369.98 143 0.48 51 255 4.25 0.18 0.66 198 1,410 1,022 14 14 1,396 0.03 369.98 184 0.61 52 260 4.33 0.22 0.80 239 1,410 1,022 14 14 1,396 0.03 369.98 225 0.75 53 265 4.42 0.26 0.94 281 1,410 1,022 14 14 1,396 0.03 369.98 267 0.89 369.98 267 0.89 Plate E-2.2 Incremental 6 Hour Storm PROJECT: 6/23/23 DRAINAGE AREA-ACRES 3.60 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.65 DRYWELLS UNIT TIME-PERCENT OF LAG 303.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs MANUAL RCFC & WCD HYDROLOGY SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITION BASIN STAGE STORAGE - 6 HOUR STORM 369.98 308 1.03 56 280 4.67 0.33 1.21 363 1,410 1,022 14 14 1,396 0.03 369.98 349 1.16 57 285 4.75 0.37 1.35 405 1,410 1,022 14 14 1,396 0.03 369.98 390 1.30 58 290 4.83 0.37 1.35 405 1,410 1,022 14 14 1,396 0.03 369.98 390 1.30 59 295 4.92 0.41 1.49 446 1,410 1,022 14 14 1,396 0.03 369.98 432 1.44 60 300 5.00 0.45 1.62 487 1,410 1,022 14 14 1,396 0.03 369.98 473 1.58 61 305 5.08 0.64 2.31 694 1,410 1,022 14 14 1,396 0.03 369.98 679 2.26 62 310 5.17 0.83 3.00 900 1,410 1,022 14 14 1,396 0.03 369.98 886 2.95 63 315 5.25 0.94 3.41 1,024 1,410 1,022 14 14 1,396 0.03 369.98 1,010 3.37 64 320 5.33 1.05 3.83 1,148 1,410 1,022 14 14 1,396 0.03 369.98 1,134 3.78 65 325 5.42 1.24 4.51 1,354 1,410 1,022 14 14 1,396 0.03 369.98 1,340 4.47 66 330 5.50 1.58 5.75 1,726 1,410 1,022 14 14 1,396 0.03 369.98 1,712 5.71 67 335 5.58 0.18 0.66 198 1,410 1,022 14 14 1,396 0.03 369.98 184 0.61 68 340 5.67 0.05 0.19 56 1,410 1,022 14 14 1,396 0.03 369.98 42 0.14 69 345 5.75 0.03 0.12 37 1,410 1,022 14 14 1,396 0.03 369.98 23 0.08 70 350 5.83 0.03 0.10 31 1,410 1,022 14 14 1,396 0.03 369.98 17 0.06 71 355 5.92 0.02 0.06 19 1,410 1,022 14 14 1,396 0.03 369.98 4 0.01 72 360 6.00 0.01 0.04 12 1,409 1,021 14 14 1,394 0.03 369.98 0 0.00 EFFECTIVE RAIN TOTAL VOLUME RETAINED MAX WSEL PEAK FLOW RATE AVERAGE PERCOLATION RATE BASIN WORKSHEET SUMMARY Plate E-2.2 Incremental 6 Hour Storm PROJECT: DRAINAGE AREA DRAINAGE AREA-ACRES 3.60 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 15 LAG TIME - MINUTES 1.65 DRYWELLS UNIT TIME-PERCENT OF LAG 911.3 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 DRYWELL PERCOLATION RATE 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs 1 15 0.25 0.006 0.0 19 19 437 18 18 1 0.00 368.00 0 0.00 2 30 0.50 0.009 0.0 29 30 442 18 18 11 0.00 368.02 0 0.00 3 45 0.75 0.009 0.0 29 40 447 19 19 21 0.00 368.04 0 0.00 4 60 1.00 0.012 0.0 38 60 457 19 19 40 0.00 368.07 0 0.00 5 75 1.25 0.009 0.0 29 69 461 19 19 50 0.00 368.09 0 0.00 6 90 1.50 0.009 0.0 29 79 466 19 19 59 0.00 368.11 0 0.00 7 105 1.75 0.009 0.0 29 88 470 20 20 68 0.00 368.12 0 0.00 8 120 2.00 0.012 0.0 38 107 479 20 20 87 0.00 368.16 0 0.00 9 135 2.25 0.012 0.0 38 125 488 20 20 105 0.00 368.19 0 0.00 10 150 2.50 0.012 0.0 38 143 497 21 21 122 0.00 368.22 0 0.00 11 165 2.75 0.015 0.1 48 170 510 21 21 149 0.00 368.27 0 0.00 12 180 3.00 0.015 0.1 48 197 523 22 22 175 0.00 368.31 0 0.00 13 195 3.25 0.015 0.1 48 223 535 22 22 200 0.00 368.36 0 0.00 14 210 3.50 0.015 0.1 48 248 547 23 23 225 0.01 368.40 0 0.00 15 225 3.75 0.015 0.1 48 273 560 23 23 250 0.01 368.45 0 0.00 16 240 4.00 0.018 0.1 57 307 576 24 24 283 0.01 368.51 0 0.00 17 255 4.25 0.018 0.1 57 341 592 25 25 316 0.01 368.57 0 0.00 18 270 4.50 0.020 0.1 67 383 612 26 26 357 0.01 368.64 0 0.00 19 285 4.75 0.020 0.1 67 424 632 26 26 398 0.01 368.72 0 0.00 20 300 5.00 0.023 0.1 77 475 656 27 27 447 0.01 368.80 0 0.00 21 315 5.25 0.018 0.1 57 505 671 28 28 477 0.01 368.86 0 0.00 22 330 5.50 0.020 0.1 67 544 690 29 29 515 0.01 368.92 0 0.00 23 345 5.75 0.023 0.1 77 591 709 30 30 562 0.01 369.01 0 0.00 24 360 6.00 0.023 0.1 77 638 727 30 30 608 0.01 369.06 0 0.00 25 375 6.25 0.026 0.1 86 694 749 31 31 663 0.02 369.12 0 0.00 26 390 6.50 0.026 0.1 86 749 769 32 32 717 0.02 369.19 0 0.00 27 405 6.75 0.029 0.1 96 813 794 33 33 780 0.02 369.26 0 0.00 28 420 7.00 0.029 0.1 96 875 818 34 34 841 0.02 369.33 0 0.00 29 435 7.25 0.029 0.1 96 937 841 35 35 902 0.02 369.40 0 0.00 30 450 7.50 0.032 0.1 105 1,007 868 36 36 971 0.02 369.49 0 0.00 31 465 7.75 0.035 0.1 115 1,086 898 37 37 1,048 0.02 369.58 0 0.00 32 480 8.00 0.038 0.1 124 1,173 931 39 39 1,134 0.03 369.68 0 0.00 33 495 8.25 0.044 0.2 143 1,277 971 40 40 1,237 0.03 369.80 0 0.00 34 510 8.50 0.044 0.2 143 1,380 1,010 42 42 1,338 0.03 369.92 0 0.00 35 525 8.75 0.047 0.2 153 1,410 1,022 43 43 1,368 0.03 369.95 81 0.09 36 540 9.00 0.050 0.2 163 1,410 1,022 43 43 1,368 0.03 369.95 120 0.13 37 555 9.25 0.056 0.2 182 1,410 1,022 43 43 1,368 0.03 369.95 139 0.15 38 570 9.50 0.059 0.2 191 1,410 1,022 43 43 1,368 0.03 369.95 149 0.17 39 585 9.75 0.061 0.2 201 1,410 1,022 43 43 1,368 0.03 369.95 158 0.18 40 600 10.00 0.064 0.2 210 1,410 1,022 43 43 1,368 0.03 369.95 168 0.19 41 615 10.25 0.044 0.2 143 1,410 1,022 43 43 1,368 0.03 369.95 101 0.11 42 630 10.50 0.044 0.2 143 1,410 1,022 43 43 1,368 0.03 369.95 101 0.11 43 645 10.75 0.059 0.2 191 1,410 1,022 43 43 1,368 0.03 369.95 149 0.17 44 660 11.00 0.059 0.2 191 1,410 1,022 43 43 1,368 0.03 369.95 149 0.17 369.95 139 0.15 SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 24 HOUR STORM RCFC & WCD HYDROLOGY MANUAL Plate E-2.2 Incremental 24 Hour Storm PROJECT: DRAINAGE AREA DRAINAGE AREA-ACRES 3.60 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 15 LAG TIME - MINUTES 1.65 DRYWELLS UNIT TIME-PERCENT OF LAG 911.3 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 DRYWELL PERCOLATION RATE 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 24 HOUR STORM RCFC & WCD HYDROLOGY MANUAL 369.95 139 0.15 47 705 11.75 0.050 0.2 163 1,410 1,022 43 43 1,368 0.03 369.95 120 0.13 48 720 12.00 0.053 0.2 172 1,410 1,022 43 43 1,368 0.03 369.95 130 0.14 49 735 12.25 0.073 0.3 239 1,410 1,022 43 43 1,368 0.03 369.95 197 0.22 50 750 12.50 0.015 0.1 48 1,410 1,022 43 43 1,368 0.03 369.95 6 0.01 51 765 12.75 0.061 0.2 200 1,410 1,022 43 43 1,368 0.03 369.95 158 0.18 52 780 13.00 0.088 0.3 288 1,410 1,022 43 43 1,368 0.03 369.95 245 0.27 53 795 13.25 0.193 0.7 630 1,410 1,022 43 43 1,368 0.03 369.95 588 0.65 54 810 13.50 0.200 0.7 654 1,410 1,022 43 43 1,368 0.03 369.95 611 0.68 55 825 13.75 0.067 0.2 220 1,410 1,022 43 43 1,368 0.03 369.95 177 0.20 56 840 14.00 0.067 0.2 220 1,410 1,022 43 43 1,368 0.03 369.95 177 0.20 57 855 14.25 0.084 0.3 275 1,410 1,022 43 43 1,368 0.03 369.95 233 0.26 58 870 14.50 0.072 0.3 234 1,410 1,022 43 43 1,368 0.03 369.95 191 0.21 59 885 14.75 0.078 0.3 255 1,410 1,022 43 43 1,368 0.03 369.95 213 0.24 60 900 15.00 0.065 0.2 213 1,410 1,022 43 43 1,368 0.03 369.95 170 0.19 61 915 15.25 0.052 0.2 170 1,410 1,022 43 43 1,368 0.03 369.95 128 0.14 62 930 15.50 0.039 0.1 127 1,410 1,022 43 43 1,368 0.03 369.95 85 0.09 63 945 15.75 0.056 0.2 182 1,410 1,022 43 43 1,368 0.03 369.95 139 0.15 64 960 16.00 0.056 0.2 182 1,410 1,022 43 43 1,368 0.03 369.95 139 0.15 65 975 16.25 0.012 0.0 38 1,406 1,020 43 43 1,364 0.03 369.95 0 0.00 66 990 16.50 0.012 0.0 38 1,402 1,019 42 42 1,359 0.03 369.94 0 0.00 67 1005 16.75 0.009 0.0 29 1,388 1,013 42 42 1,346 0.03 369.92 0 0.00 68 1020 17.00 0.009 0.0 29 1,375 1,008 42 42 1,333 0.03 369.91 0 0.00 69 1035 17.25 0.015 0.1 48 1,380 1,011 42 42 1,338 0.03 369.92 0 0.00 70 1050 17.50 0.015 0.1 48 1,386 1,013 42 42 1,344 0.03 369.92 0 0.00 71 1065 17.75 0.015 0.1 48 1,392 1,015 42 42 1,349 0.03 369.93 0 0.00 72 1080 18.00 0.012 0.0 38 1,388 1,013 42 42 1,345 0.03 369.92 0 0.00 73 1095 18.25 0.012 0.0 38 1,384 1,012 42 42 1,342 0.03 369.92 0 0.00 74 1110 18.50 0.012 0.0 38 1,380 1,010 42 42 1,338 0.03 369.91 0 0.00 75 1125 18.75 0.009 0.0 29 1,366 1,005 42 42 1,325 0.03 369.90 0 0.00 76 1140 19.00 0.006 0.0 19 1,344 997 42 42 1,302 0.03 369.87 0 0.00 77 1155 19.25 0.009 0.0 29 1,331 992 41 41 1,290 0.03 369.86 0 0.00 78 1170 19.50 0.012 0.0 38 1,328 990 41 41 1,287 0.03 369.85 0 0.00 79 1185 19.75 0.009 0.0 29 1,315 986 41 41 1,274 0.03 369.84 0 0.00 80 1200 20.00 0.006 0.0 19 1,293 977 41 41 1,253 0.03 369.82 0 0.00 81 1215 20.25 0.009 0.0 29 1,281 973 41 41 1,241 0.03 369.80 0 0.00 82 1230 20.50 0.009 0.0 29 1,269 968 40 40 1,229 0.03 369.79 0 0.00 83 1245 20.75 0.009 0.0 29 1,258 964 40 40 1,218 0.03 369.77 0 0.00 84 1260 21.00 0.006 0.0 19 1,237 956 40 40 1,197 0.03 369.75 0 0.00 85 1275 21.25 0.009 0.0 29 1,226 951 40 40 1,186 0.03 369.74 0 0.00 86 1290 21.50 0.006 0.0 19 1,205 944 39 39 1,166 0.03 369.71 0 0.00 87 1305 21.75 0.009 0.0 29 1,195 940 39 39 1,155 0.03 369.70 0 0.00 88 1320 22.00 0.006 0.0 19 1,175 932 39 39 1,136 0.03 369.68 0 0.00 89 1335 22.25 0.009 0.0 29 1,164 928 39 39 1,126 0.03 369.67 0 0.00 Plate E-2.2 Incremental 24 Hour Storm PROJECT: DRAINAGE AREA DRAINAGE AREA-ACRES 3.60 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 15 LAG TIME - MINUTES 1.65 DRYWELLS UNIT TIME-PERCENT OF LAG 911.3 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 DRYWELL PERCOLATION RATE 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 24 HOUR STORM RCFC & WCD HYDROLOGY MANUAL 92 1380 23.00 0.006 0.0 19 1,107 906 38 38 1,069 0.02 369.60 0 0.00 93 1395 23.25 0.006 0.0 19 1,088 899 37 37 1,051 0.02 369.58 0 0.00 94 1410 23.50 0.006 0.0 19 1,070 892 37 37 1,033 0.02 369.56 0 0.00 95 1425 23.75 0.006 0.0 19 1,052 885 37 37 1,015 0.02 369.54 0 0.00 96 1440 24.00 0.006 0.0 19 1,034 878 37 37 997 0.02 369.52 0 0.00 EFFECTIVE RAIN TOTAL VOLUME RETAINED MAX WSEL PEAK FLOW RATE AVERAGE PERCOLATION RATE BASIN WORKSHEET SUMMARY Plate E-2.2 Incremental 24 Hour Storm PROECT JOB No. BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR (ft)(ft)(sf)(sf)(cuft)(cuft)(acre-ft) 368 0 0 428 0 0 0.00 369 1 1 268 696 557 557 0.01 370 1 2 326 1,022 854 1,410 0.03 WHERE: BASIN VOLUME WORKSHEET ()()2121213 1 AAAAEEV++−= Basin Characteristics INCREMENTAL INCREASE WORKSHEET RRR 2244 2 AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 A PAVING/HARDSCAPE 2.130 D 32 0.74 1.00 9 A LANDSCAPING 3.500 D 32 0.74 0.10 AREA SOIL TRIBUTARY AREAS ACRES LOW LOSS RI INFILTRATION IMPERVIOUS DESIG GROUP CONDITION NUMBER RATE PERCENT 2 A PAVING/HARDSCAPE 3.110 D 32 0.74 1.00 9 A LANDSCAPING 2.520 D 32 0.74 0.10 UNDEVELOPED DEVELOPED 452 ft 602 ft 122 ft 172 ft 386.2 ft 386.2 ft ELEVATION OF CONCENTRATION POINT 376.5 ft 359.0 ft 0.018 0.018 100 LOW LOSS RATE (Storm Events > 10 Years)85.00% POINT RAIN FROM NOAA ATLAS 1-HOUR 1.98 in 3-HOUR 2.59 in 6-HOUR 3.16 in 24-HOUR 4.88 in BASIN CHARACTERISTICS:ELEVATION AREA 359.0 ft 138 sf 360.0 ft 649 sf 361.0 ft 751 sf 362.0 ft 836 sf 363.0 ft 918 sf 364.0 ft 997 sf PERCOLATION RATE 2.0 in/hr NUMBER USED 0 PERCOLATION RATE 0.00 cfs LOWEST FLOWLINE ELEVATION 370.70 ft LOWEST PAD ELEVATION 377.6 ft Low Loss Conditions: X=Existing; D=Developed; BS=Retention PROPOSED CONDITIONS EXISTING CONDITIONS RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD PROJECT: Job No.: BY:DATE:6/23/23 [1] AMC [2] FREQUENCY-YEARS NOAA ATLAS [3] STORM DURATION: 1-HOUR 3-HOUR 6-HOUR EFFECTIVE RAIN (in)1.53 1.30 1.20 0.95 1.64 1.58 1.43 1.25 FLOOD VOLUME (cu-ft)31,337 26,656 24,556 19,483 33,470 32,347 29,246 25,564 (acre-ft)0.72 0.61 0.56 0.45 0.77 0.74 0.67 0.59 PEAK FLOW (cfs)N/A 11.93 9.52 1.58 N/A 12.52 10.11 2.09 (cu-ft)33,470 32,347 29,246 25,564 (cu-ft)31,337 26,656 24,556 19,483 (cu-ft)2,132 5,690 4,690 6,081 (cu-ft)3,834 4,124 4,522 7,040 (cu-ft)29,635 28,222 24,725 18,524 (ac-ft)0.68 0.65 0.57 0.43 MAXIMUM WSEL (ft)363.99 363.99 363.99 363.96 4.99 4.99 4.99 4.96 LOWEST FLOWLINE ELEVATION LOWEST PAD ELEVATION ESTIMATED TIME TO DEWATER BASIN Based on total Flood Volume & DEVELOPED CONDITION FLOOD VOLUME UNDEVELOPED CONDITION FLOOD VOLUME THE 3-HOUR STORM PEAK DISCHARGES SHOULD NORMALLY COMPARE WELL WITH (days)1.0 1.1 1.3 2.0 INCREMENTAL INCREASE IN FLOOD VOLUME TOTAL FLOOD VOLUME RETAINED TOTAL BASIN OUTFLOW STORM EVENT SUMMARY DEVELOPED CONDITIONUNDEVELOPED CONDITION STORM EVENT SUMMARY RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD PHYSICAL DATA HYDROLOGY MANUAL RRR RAINFALL DATA 0 PROJECT: Job No.: BY:DATE:6/23/23 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] A 32 0.74 100%0.07 2.130 0.378 0.0280 DEVELOPED 0.1000 0.0378 A 32 0.74 10%0.67 3.500 0.622 0.4186 DEVELOPED 0.8200 0.5098 SUM 5.630 SUM 0.4466 0.5476 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.223314387 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00414 For 2, 5 & 10 Year Storm Events Ft=C(24-(T/60))^1.55 =0.00414 0.22 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.4466 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. AVERAGE ADJUSTED LOSS RATE - UNDEVELOPED CONDITIONS RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM Living Desert - Crossroads Phase 3 RRR 2244 AMC II PROJECT: Job No.:2244 DATE BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 UNIT TIME-PERCENT OF LAG 504.8 TOTAL ADJUSTED STORM RAIN-INCHES 1.98 CONSTANT LOSS RATE-in/hr 0.45 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 0.86 0.45 0.73 0.41 2.32 2 10 0.17 4.2 1.00 0.45 0.85 0.55 3.13 3 15 0.25 4.4 1.05 0.45 0.89 0.60 3.40 4 20 0.33 4.6 1.09 0.45 0.93 0.65 3.67 5 25 0.42 5.0 1.19 0.45 1.01 0.74 4.21 6 30 0.50 5.6 1.33 0.45 1.13 0.88 5.02 7 35 0.58 6.4 1.52 0.45 1.29 1.07 6.10 8 40 0.67 8.1 1.92 0.45 1.64 1.48 8.39 9 45 0.75 13.1 3.11 0.45 2.65 2.67 15.13 10 50 0.83 34.5 8.20 0.45 6.97 7.75 44.00 11 55 0.92 6.7 1.59 0.45 1.35 1.15 6.50 12 60 1.00 3.8 0.90 0.45 0.77 0.46 2.59 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.53 FLOOD VOLUME (acft)0.72 FLOOD VOLUME (cuft)31,337 PEAK FLOW RATE (cfs)44.00 RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY MANUAL UNDEVELOPED CONDITION 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM PROJECT: Job No.:2244 DATE BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 UNIT TIME-PERCENT OF LAG 504.8 TOTAL ADJUSTED STORM RAIN-INCHES 2.59 CONSTANT LOSS RATE-in/hr 0.45 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 0.40 0.45 0.34 0.06 0.34 2 10 0.17 1.3 0.40 0.45 0.34 0.06 0.34 3 15 0.25 1.1 0.34 0.45 0.29 0.05 0.29 4 20 0.33 1.5 0.47 0.45 0.40 0.02 0.11 5 25 0.42 1.5 0.47 0.45 0.40 0.02 0.11 6 30 0.50 1.8 0.56 0.45 0.48 0.11 0.64 7 35 0.58 1.5 0.47 0.45 0.40 0.02 0.11 8 40 0.67 1.8 0.56 0.45 0.48 0.11 0.64 9 45 0.75 1.8 0.56 0.45 0.48 0.11 0.64 10 50 0.83 1.5 0.47 0.45 0.40 0.02 0.11 11 55 0.92 1.6 0.50 0.45 0.42 0.05 0.29 12 60 1.00 1.8 0.56 0.45 0.48 0.11 0.64 13 65 1.08 2.2 0.68 0.45 0.58 0.24 1.35 14 70 1.17 2.2 0.68 0.45 0.58 0.24 1.35 15 75 1.25 2.2 0.68 0.45 0.58 0.24 1.35 16 80 1.33 2.0 0.62 0.45 0.53 0.17 0.99 17 85 1.42 2.6 0.81 0.45 0.69 0.36 2.05 18 90 1.50 2.7 0.84 0.45 0.71 0.39 2.23 19 95 1.58 2.4 0.75 0.45 0.63 0.30 1.70 20 100 1.67 2.7 0.84 0.45 0.71 0.39 2.23 21 105 1.75 3.3 1.03 0.45 0.87 0.58 3.29 22 110 1.83 3.1 0.96 0.45 0.82 0.52 2.93 23 115 1.92 2.9 0.90 0.45 0.77 0.45 2.58 24 120 2.00 3.0 0.93 0.45 0.79 0.49 2.76 25 125 2.08 3.1 0.96 0.45 0.82 0.52 2.93 26 130 2.17 4.2 1.31 0.45 1.11 0.86 4.87 27 135 2.25 5.0 1.55 0.45 1.32 1.11 6.29 28 140 2.33 3.5 1.09 0.45 0.92 0.64 3.64 29 145 2.42 6.8 2.11 0.45 1.80 1.67 9.46 30 150 2.50 7.3 2.27 0.45 1.93 1.82 10.34 31 155 2.58 8.2 2.55 0.45 2.17 2.10 11.93 32 160 2.67 5.9 1.83 0.45 1.56 1.39 7.87 33 165 2.75 2.0 0.62 0.45 0.53 0.17 0.99 34 170 2.83 1.8 0.56 0.45 0.48 0.11 0.64 35 175 2.92 1.8 0.56 0.45 0.48 0.11 0.64 36 180 3.00 0.6 0.19 0.45 0.16 0.03 0.16 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.30 FLOOD VOLUME (acft)0.61 FLOOD VOLUME (cuft)26,656 PEAK FLOW RATE (cfs)11.93 RCFC & WCD HYDROLOGY UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD UNDEVELOPED CONDITION 3-HOUR STORM PROJECT: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 UNIT TIME-PERCENT OF LAG 504.8 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 CONSTANT LOSS RATE-in/hr 0.447 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 0.190 0.45 0.16 0.03 0.16 2 10 0.17 0.6 0.228 0.45 0.19 0.03 0.19 3 15 0.25 0.6 0.228 0.45 0.19 0.03 0.19 4 20 0.33 0.6 0.228 0.45 0.19 0.03 0.19 5 25 0.42 0.6 0.228 0.45 0.19 0.03 0.19 6 30 0.50 0.7 0.265 0.45 0.23 0.04 0.23 7 35 0.58 0.7 0.265 0.45 0.23 0.04 0.23 8 40 0.67 0.7 0.265 0.45 0.23 0.04 0.23 9 45 0.75 0.7 0.265 0.45 0.23 0.04 0.23 10 50 0.83 0.7 0.265 0.45 0.23 0.04 0.23 11 55 0.92 0.7 0.265 0.45 0.23 0.04 0.23 12 60 1.00 0.8 0.303 0.45 0.26 0.05 0.26 13 65 1.08 0.8 0.303 0.45 0.26 0.05 0.26 14 70 1.17 0.8 0.303 0.45 0.26 0.05 0.26 15 75 1.25 0.8 0.303 0.45 0.26 0.05 0.26 16 80 1.33 0.8 0.303 0.45 0.26 0.05 0.26 17 85 1.42 0.8 0.303 0.45 0.26 0.05 0.26 18 90 1.50 0.8 0.303 0.45 0.26 0.05 0.26 19 95 1.58 0.8 0.303 0.45 0.26 0.05 0.26 20 100 1.67 0.8 0.303 0.45 0.26 0.05 0.26 21 105 1.75 0.8 0.303 0.45 0.26 0.05 0.26 22 110 1.83 0.8 0.303 0.45 0.26 0.05 0.26 23 115 1.92 0.8 0.303 0.45 0.26 0.05 0.26 24 120 2.00 0.9 0.341 0.45 0.29 0.05 0.29 25 125 2.08 0.8 0.303 0.45 0.26 0.05 0.26 26 130 2.17 0.9 0.341 0.45 0.29 0.05 0.29 27 135 2.25 0.9 0.341 0.45 0.29 0.05 0.29 28 140 2.33 0.9 0.341 0.45 0.29 0.05 0.29 29 145 2.42 0.9 0.341 0.45 0.29 0.05 0.29 30 150 2.50 0.9 0.341 0.45 0.29 0.05 0.29 31 155 2.58 0.9 0.341 0.45 0.29 0.05 0.29 32 160 2.67 0.9 0.341 0.45 0.29 0.05 0.29 33 165 2.75 1.0 0.379 0.45 0.32 0.06 0.32 34 170 2.83 1.0 0.379 0.45 0.32 0.06 0.32 35 175 2.92 1.0 0.379 0.45 0.32 0.06 0.32 36 180 3.00 1.0 0.379 0.45 0.32 0.06 0.32 37 185 3.08 1.0 0.379 0.45 0.32 0.06 0.32 38 190 3.17 1.1 0.417 0.45 0.35 0.06 0.36 39 195 3.25 1.1 0.417 0.45 0.35 0.06 0.36 40 200 3.33 1.1 0.417 0.45 0.35 0.06 0.36 41 205 3.42 1.2 0.455 0.45 0.39 0.01 0.05 42 210 3.50 1.3 0.493 0.45 0.42 0.05 0.26 43 215 3.58 1.4 0.531 0.45 0.45 0.08 0.48 44 220 3.67 1.4 0.531 0.45 0.45 0.08 0.48 45 225 3.75 1.5 0.569 0.45 0.48 0.12 0.69 46 230 3.83 1.5 0.569 0.45 0.48 0.12 0.69 47 235 3.92 1.6 0.607 0.45 0.52 0.16 0.91 48 240 4.00 1.6 0.607 0.45 0.52 0.16 0.91 49 245 4.08 1.7 0.645 0.45 0.55 0.20 1.12 MANUAL UNDEVELOPED CONDITION 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD Undeveloped 6 Hour Storm PROJECT: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 UNIT TIME-PERCENT OF LAG 504.8 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 CONSTANT LOSS RATE-in/hr 0.447 85% Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow MANUAL UNDEVELOPED CONDITION 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 52 260 4.33 2.0 0.758 0.45 0.64 0.31 1.77 53 265 4.42 2.1 0.796 0.45 0.68 0.35 1.99 54 270 4.50 2.1 0.796 0.45 0.68 0.35 1.99 55 275 4.58 2.2 0.834 0.45 0.71 0.39 2.20 56 280 4.67 2.3 0.872 0.45 0.74 0.43 2.42 57 285 4.75 2.4 0.910 0.45 0.77 0.46 2.63 58 290 4.83 2.4 0.910 0.45 0.77 0.46 2.63 59 295 4.92 2.5 0.948 0.45 0.81 0.50 2.85 60 300 5.00 2.6 0.986 0.45 0.84 0.54 3.06 61 305 5.08 3.1 1.176 0.45 1.00 0.73 4.14 62 310 5.17 3.6 1.365 0.45 1.16 0.92 5.21 63 315 5.25 3.9 1.479 0.45 1.26 1.03 5.86 64 320 5.33 4.2 1.593 0.45 1.35 1.15 6.51 65 325 5.42 4.7 1.782 0.45 1.51 1.34 7.58 66 330 5.50 5.6 2.124 0.45 1.80 1.68 9.52 67 335 5.58 1.9 0.720 0.45 0.61 0.27 1.55 68 340 5.67 0.9 0.341 0.45 0.29 0.05 0.29 69 345 5.75 0.6 0.228 0.45 0.19 0.03 0.19 70 350 5.83 0.5 0.190 0.45 0.16 0.03 0.16 71 355 5.92 0.3 0.114 0.45 0.10 0.02 0.10 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.20 FLOOD VOLUME (acft)0.56 FLOOD VOLUME (cuft)24,556 PEAK FLOW RATE (cfs)9.52 Undeveloped 6 Hour Storm PROJECT: Job No.:2244 DATE: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.630 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.4466 LAG TIME - MINUTES 0.99 MINIMUM LOSS RATE (for var. loss) - in/hr 0.223 1514.3 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 C 0.00414 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 0.039 0.789 0.033 0.006 0.03 2 30 0.50 0.3 0.059 0.780 0.050 0.009 0.05 3 45 0.75 0.3 0.059 0.770 0.050 0.009 0.05 4 60 1.00 0.4 0.078 0.761 0.066 0.012 0.07 5 75 1.25 0.3 0.059 0.752 0.050 0.009 0.05 6 90 1.50 0.3 0.059 0.743 0.050 0.009 0.05 7 105 1.75 0.3 0.059 0.735 0.050 0.009 0.05 8 120 2.00 0.4 0.078 0.726 0.066 0.012 0.07 9 135 2.25 0.4 0.078 0.717 0.066 0.012 0.07 10 150 2.50 0.4 0.078 0.708 0.066 0.012 0.07 11 165 2.75 0.5 0.098 0.700 0.083 0.015 0.08 12 180 3.00 0.5 0.098 0.691 0.083 0.015 0.08 13 195 3.25 0.5 0.098 0.682 0.083 0.015 0.08 14 210 3.50 0.5 0.098 0.674 0.083 0.015 0.08 15 225 3.75 0.5 0.098 0.666 0.083 0.015 0.08 16 240 4.00 0.6 0.117 0.657 0.100 0.018 0.10 17 255 4.25 0.6 0.117 0.649 0.100 0.018 0.10 18 270 4.50 0.7 0.137 0.641 0.116 0.020 0.12 19 285 4.75 0.7 0.137 0.632 0.116 0.020 0.12 20 300 5.00 0.8 0.156 0.624 0.133 0.023 0.13 21 315 5.25 0.6 0.117 0.616 0.100 0.018 0.10 22 330 5.50 0.7 0.137 0.608 0.116 0.020 0.12 23 345 5.75 0.8 0.156 0.600 0.133 0.023 0.13 24 360 6.00 0.8 0.156 0.592 0.133 0.023 0.13 25 375 6.25 0.9 0.176 0.584 0.149 0.026 0.15 26 390 6.50 0.9 0.176 0.577 0.149 0.026 0.15 27 405 6.75 1.0 0.195 0.569 0.166 0.029 0.17 28 420 7.00 1.0 0.195 0.561 0.166 0.029 0.17 29 435 7.25 1.0 0.195 0.553 0.166 0.029 0.17 30 450 7.50 1.1 0.215 0.546 0.183 0.032 0.18 31 465 7.75 1.2 0.234 0.538 0.199 0.035 0.20 32 480 8.00 1.3 0.254 0.531 0.216 0.038 0.22 33 495 8.25 1.5 0.293 0.524 0.249 0.044 0.25 34 510 8.50 1.5 0.293 0.516 0.249 0.044 0.25 35 525 8.75 1.6 0.312 0.509 0.265 0.047 0.27 36 540 9.00 1.7 0.332 0.502 0.282 0.050 0.28 37 555 9.25 1.9 0.371 0.495 0.315 0.056 0.32 38 570 9.50 2.0 0.390 0.488 0.332 0.059 0.33 39 585 9.75 2.1 0.410 0.481 0.348 0.061 0.35 40 600 10.00 2.2 0.429 0.474 0.365 0.064 0.37 41 615 10.25 1.5 0.293 0.467 0.249 0.044 0.25 42 630 10.50 1.5 0.293 0.460 0.249 0.044 0.25 43 645 10.75 2.0 0.390 0.454 0.332 0.059 0.33 44 660 11.00 2.0 0.390 0.447 0.332 0.059 0.33 45 675 11.25 1.9 0.371 0.440 0.315 0.056 0.32 46 690 11.50 1.9 0.371 0.434 0.315 0.056 0.32 47 705 11.75 1.7 0.332 0.427 0.282 0.050 0.28 48 720 12.00 1.8 0.351 0.421 0.299 0.053 0.30 49 735 12.25 2.5 0.488 0.415 0.415 0.073 0.42 50 750 12.50 2.6 0.508 0.409 0.431 0.099 0.56 51 765 12.75 2.8 0.547 0.402 0.465 0.144 0.82 52 780 13.00 2.9 0.566 0.396 0.481 0.170 0.96 53 795 13.25 3.4 0.664 0.390 0.564 0.273 1.55 54 810 13.50 3.4 0.664 0.385 0.564 0.279 1.58 55 825 13.75 2.3 0.449 0.379 0.382 0.070 0.40 56 840 14.00 2.3 0.449 0.373 0.382 0.076 0.43 57 855 14.25 2.7 0.527 0.367 0.448 0.160 0.91 58 870 14.50 2.6 0.508 0.362 0.431 0.146 0.83 59 885 14.75 2.6 0.508 0.356 0.431 0.151 0.86 UNDEVELOPED CONDITION 24-HOUR STORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM HYDROLOGY SHORTCUT METHOD MANUAL PROJECT: Job No.:2244 DATE: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.630 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.4466 LAG TIME - MINUTES 0.99 MINIMUM LOSS RATE (for var. loss) - in/hr 0.223 1514.3 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 C 0.00414 Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow UNDEVELOPED CONDITION 24-HOUR STORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM HYDROLOGY SHORTCUT METHOD MANUAL 62 930 15.50 2.3 0.449 0.340 0.382 0.109 0.62 63 945 15.75 1.9 0.371 0.335 0.315 0.036 0.20 64 960 16.00 1.9 0.371 0.330 0.315 0.041 0.23 65 975 16.25 0.4 0.078 0.325 0.066 0.012 0.07 66 990 16.50 0.4 0.078 0.320 0.066 0.012 0.07 67 1005 16.75 0.3 0.059 0.315 0.050 0.009 0.05 68 1020 17.00 0.3 0.059 0.310 0.050 0.009 0.05 69 1035 17.25 0.5 0.098 0.305 0.083 0.015 0.08 70 1050 17.50 0.5 0.098 0.301 0.083 0.015 0.08 71 1065 17.75 0.5 0.098 0.296 0.083 0.015 0.08 72 1080 18.00 0.4 0.078 0.292 0.066 0.012 0.07 73 1095 18.25 0.4 0.078 0.288 0.066 0.012 0.07 74 1110 18.50 0.4 0.078 0.283 0.066 0.012 0.07 75 1125 18.75 0.3 0.059 0.279 0.050 0.009 0.05 76 1140 19.00 0.2 0.039 0.275 0.033 0.006 0.03 77 1155 19.25 0.3 0.059 0.271 0.050 0.009 0.05 78 1170 19.50 0.4 0.078 0.268 0.066 0.012 0.07 79 1185 19.75 0.3 0.059 0.264 0.050 0.009 0.05 80 1200 20.00 0.2 0.039 0.261 0.033 0.006 0.03 81 1215 20.25 0.3 0.059 0.257 0.050 0.009 0.05 82 1230 20.50 0.3 0.059 0.254 0.050 0.009 0.05 83 1245 20.75 0.3 0.059 0.251 0.050 0.009 0.05 84 1260 21.00 0.2 0.039 0.247 0.033 0.006 0.03 85 1275 21.25 0.3 0.059 0.245 0.050 0.009 0.05 86 1290 21.50 0.2 0.039 0.242 0.033 0.006 0.03 87 1305 21.75 0.3 0.059 0.239 0.050 0.009 0.05 88 1320 22.00 0.2 0.039 0.237 0.033 0.006 0.03 89 1335 22.25 0.3 0.059 0.234 0.050 0.009 0.05 90 1350 22.50 0.2 0.039 0.232 0.033 0.006 0.03 91 1365 22.75 0.2 0.039 0.230 0.033 0.006 0.03 92 1380 23.00 0.2 0.039 0.228 0.033 0.006 0.03 93 1395 23.25 0.2 0.039 0.227 0.033 0.006 0.03 94 1410 23.50 0.2 0.039 0.225 0.033 0.006 0.03 95 1425 23.75 0.2 0.039 0.224 0.033 0.006 0.03 96 1440 24.00 0.2 0.039 0.223 0.033 0.006 0.03 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)0.95 FLOOD VOLUME (acft)0.45 FLOOD VOLUME (cuft)19,483 PEAK FLOW (cfs)1.58 PROJECT: Job No.: BY:DATE:6/23/23 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] A 32 0.74 100%0.07 3.110 0.552 0.0409 DEVELOPED 0.1000 0.0552 A 32 0.74 10%0.67 2.520 0.448 0.3014 DEVELOPED 0.8200 0.3670 SUM 5.630 SUM 0.3423 0.4223 VARIABLE LOSS RATE CURVE (24-HOUR STORM ONLY) Fm=0.171146359 NOTE: Low loss rates established per RCFC/2322 (Dated: May-30-95) C=0.00317 For Storms Less than the 100 Year Event Ft=C(24-(T/60))^1.55 =0.00317 0.17 in/hr Undeveloped Condition: Low Loss = 90% CONSTANT LOSS RATE (3 & 6 HOUR STORMS)=0.3423 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. RRR AVERAGE ADJUSTED LOSS RATE - DEVELOPED CONDITIONS RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD Living Desert - Crossroads Phase 3 HYDROLOGY MANUAL AMC II Plate E-2.1 PROJECT: Job No.:2244 DATE BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 UNIT TIME-PERCENT OF LAG 504.8 TOTAL ADJUSTED STORM RAIN-INCHES 1.98 CONSTANT LOSS RATE-in/hr 0.34 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 0.86 0.34 0.73 0.51 2.91 2 10 0.17 4.2 1.00 0.34 0.85 0.66 3.72 3 15 0.25 4.4 1.05 0.34 0.89 0.70 3.99 4 20 0.33 4.6 1.09 0.34 0.93 0.75 4.26 5 25 0.42 5.0 1.19 0.34 1.01 0.85 4.80 6 30 0.50 5.6 1.33 0.34 1.13 0.99 5.61 7 35 0.58 6.4 1.52 0.34 1.29 1.18 6.69 8 40 0.67 8.1 1.92 0.34 1.64 1.58 8.98 9 45 0.75 13.1 3.11 0.34 2.65 2.77 15.73 10 50 0.83 34.5 8.20 0.34 6.97 7.85 44.59 11 55 0.92 6.7 1.59 0.34 1.35 1.25 7.09 12 60 1.00 3.8 0.90 0.34 0.77 0.56 3.18 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.64 FLOOD VOLUME (acft)0.77 FLOOD VOLUME (cuft)33,470 PEAK FLOW RATE (cfs)44.59 MANUAL DEVELOPED CONDITIONS 1-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY PROJECT: Job No.:2244 DATE BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.09 UNIT TIME-PERCENT OF LAG 457.7 TOTAL ADJUSTED STORM RAIN-INCHES 2.59 CONSTANT LOSS RATE-in/hr 0.34 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 0.40 0.34 0.34 0.06 0.35 2 10 0.17 1.3 0.40 0.34 0.34 0.06 0.35 3 15 0.25 1.1 0.34 0.34 0.29 0.05 0.29 4 20 0.33 1.5 0.47 0.34 0.40 0.12 0.70 5 25 0.42 1.5 0.47 0.34 0.40 0.12 0.70 6 30 0.50 1.8 0.56 0.34 0.48 0.22 1.23 7 35 0.58 1.5 0.47 0.34 0.40 0.12 0.70 8 40 0.67 1.8 0.56 0.34 0.48 0.22 1.23 9 45 0.75 1.8 0.56 0.34 0.48 0.22 1.23 10 50 0.83 1.5 0.47 0.34 0.40 0.12 0.70 11 55 0.92 1.6 0.50 0.34 0.42 0.15 0.88 12 60 1.00 1.8 0.56 0.34 0.48 0.22 1.23 13 65 1.08 2.2 0.68 0.34 0.58 0.34 1.94 14 70 1.17 2.2 0.68 0.34 0.58 0.34 1.94 15 75 1.25 2.2 0.68 0.34 0.58 0.34 1.94 16 80 1.33 2.0 0.62 0.34 0.53 0.28 1.59 17 85 1.42 2.6 0.81 0.34 0.69 0.47 2.64 18 90 1.50 2.7 0.84 0.34 0.71 0.50 2.82 19 95 1.58 2.4 0.75 0.34 0.63 0.40 2.29 20 100 1.67 2.7 0.84 0.34 0.71 0.50 2.82 21 105 1.75 3.3 1.03 0.34 0.87 0.68 3.88 22 110 1.83 3.1 0.96 0.34 0.82 0.62 3.53 23 115 1.92 2.9 0.90 0.34 0.77 0.56 3.17 24 120 2.00 3.0 0.93 0.34 0.79 0.59 3.35 25 125 2.08 3.1 0.96 0.34 0.82 0.62 3.53 26 130 2.17 4.2 1.31 0.34 1.11 0.96 5.47 27 135 2.25 5.0 1.55 0.34 1.32 1.21 6.88 28 140 2.33 3.5 1.09 0.34 0.92 0.75 4.23 29 145 2.42 6.8 2.11 0.34 1.80 1.77 10.05 30 150 2.50 7.3 2.27 0.34 1.93 1.93 10.94 31 155 2.58 8.2 2.55 0.34 2.17 2.21 12.52 32 160 2.67 5.9 1.83 0.34 1.56 1.49 8.47 33 165 2.75 2.0 0.62 0.34 0.53 0.28 1.59 34 170 2.83 1.8 0.56 0.34 0.48 0.22 1.23 35 175 2.92 1.8 0.56 0.34 0.48 0.22 1.23 36 180 3.00 0.6 0.19 0.34 0.16 0.03 0.16 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.58 FLOOD VOLUME (acft)0.74 FLOOD VOLUME (cuft)32,347 PEAK FLOW RATE (cfs)12.52 MANUAL DEVELOPED CONDITIONS 3-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY PROJECT: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.09 UNIT TIME-PERCENT OF LAG 457.7 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 CONSTANT LOSS RATE-in/hr 0.342 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 0.190 0.34 0.16 0.03 0.16 2 10 0.17 0.6 0.228 0.34 0.19 0.03 0.19 3 15 0.25 0.6 0.228 0.34 0.19 0.03 0.19 4 20 0.33 0.6 0.228 0.34 0.19 0.03 0.19 5 25 0.42 0.6 0.228 0.34 0.19 0.03 0.19 6 30 0.50 0.7 0.265 0.34 0.23 0.04 0.23 7 35 0.58 0.7 0.265 0.34 0.23 0.04 0.23 8 40 0.67 0.7 0.265 0.34 0.23 0.04 0.23 9 45 0.75 0.7 0.265 0.34 0.23 0.04 0.23 10 50 0.83 0.7 0.265 0.34 0.23 0.04 0.23 11 55 0.92 0.7 0.265 0.34 0.23 0.04 0.23 12 60 1.00 0.8 0.303 0.34 0.26 0.05 0.26 13 65 1.08 0.8 0.303 0.34 0.26 0.05 0.26 14 70 1.17 0.8 0.303 0.34 0.26 0.05 0.26 15 75 1.25 0.8 0.303 0.34 0.26 0.05 0.26 16 80 1.33 0.8 0.303 0.34 0.26 0.05 0.26 17 85 1.42 0.8 0.303 0.34 0.26 0.05 0.26 18 90 1.50 0.8 0.303 0.34 0.26 0.05 0.26 19 95 1.58 0.8 0.303 0.34 0.26 0.05 0.26 20 100 1.67 0.8 0.303 0.34 0.26 0.05 0.26 21 105 1.75 0.8 0.303 0.34 0.26 0.05 0.26 22 110 1.83 0.8 0.303 0.34 0.26 0.05 0.26 23 115 1.92 0.8 0.303 0.34 0.26 0.05 0.26 24 120 2.00 0.9 0.341 0.34 0.29 0.05 0.29 25 125 2.08 0.8 0.303 0.34 0.26 0.05 0.26 26 130 2.17 0.9 0.341 0.34 0.29 0.05 0.29 27 135 2.25 0.9 0.341 0.34 0.29 0.05 0.29 28 140 2.33 0.9 0.341 0.34 0.29 0.05 0.29 29 145 2.42 0.9 0.341 0.34 0.29 0.05 0.29 30 150 2.50 0.9 0.341 0.34 0.29 0.05 0.29 31 155 2.58 0.9 0.341 0.34 0.29 0.05 0.29 32 160 2.67 0.9 0.341 0.34 0.29 0.05 0.29 33 165 2.75 1.0 0.379 0.34 0.32 0.04 0.21 34 170 2.83 1.0 0.379 0.34 0.32 0.04 0.21 35 175 2.92 1.0 0.379 0.34 0.32 0.04 0.21 36 180 3.00 1.0 0.379 0.34 0.32 0.04 0.21 37 185 3.08 1.0 0.379 0.34 0.32 0.04 0.21 38 190 3.17 1.1 0.417 0.34 0.35 0.07 0.42 39 195 3.25 1.1 0.417 0.34 0.35 0.07 0.42 40 200 3.33 1.1 0.417 0.34 0.35 0.07 0.42 41 205 3.42 1.2 0.455 0.34 0.39 0.11 0.64 42 210 3.50 1.3 0.493 0.34 0.42 0.15 0.86 43 215 3.58 1.4 0.531 0.34 0.45 0.19 1.07 44 220 3.67 1.4 0.531 0.34 0.45 0.19 1.07 45 225 3.75 1.5 0.569 0.34 0.48 0.23 1.29 46 230 3.83 1.5 0.569 0.34 0.48 0.23 1.29 47 235 3.92 1.6 0.607 0.34 0.52 0.26 1.50 48 240 4.00 1.6 0.607 0.34 0.52 0.26 1.50 49 245 4.08 1.7 0.645 0.34 0.55 0.30 1.72 MANUAL DEVELOPED CONDITIONS 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD Developed 6 Hour Storm PROJECT: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 1.09 UNIT TIME-PERCENT OF LAG 457.7 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 CONSTANT LOSS RATE-in/hr 0.342 85% Unit Time Pattern Storm Effective Flood Period Minutes Hours Percent Rain Rain Hydrograph in/hr Flow MANUAL DEVELOPED CONDITIONS 6-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 52 260 4.33 2.0 0.758 0.34 0.64 0.42 2.36 53 265 4.42 2.1 0.796 0.34 0.68 0.45 2.58 54 270 4.50 2.1 0.796 0.34 0.68 0.45 2.58 55 275 4.58 2.2 0.834 0.34 0.71 0.49 2.79 56 280 4.67 2.3 0.872 0.34 0.74 0.53 3.01 57 285 4.75 2.4 0.910 0.34 0.77 0.57 3.22 58 290 4.83 2.4 0.910 0.34 0.77 0.57 3.22 59 295 4.92 2.5 0.948 0.34 0.81 0.61 3.44 60 300 5.00 2.6 0.986 0.34 0.84 0.64 3.65 61 305 5.08 3.1 1.176 0.34 1.00 0.83 4.73 62 310 5.17 3.6 1.365 0.34 1.16 1.02 5.81 63 315 5.25 3.9 1.479 0.34 1.26 1.14 6.45 64 320 5.33 4.2 1.593 0.34 1.35 1.25 7.10 65 325 5.42 4.7 1.782 0.34 1.51 1.44 8.17 66 330 5.50 5.6 2.124 0.34 1.80 1.78 10.11 67 335 5.58 1.9 0.720 0.34 0.61 0.38 2.15 68 340 5.67 0.9 0.341 0.34 0.29 0.05 0.29 69 345 5.75 0.6 0.228 0.34 0.19 0.03 0.19 70 350 5.83 0.5 0.190 0.34 0.16 0.03 0.16 71 355 5.92 0.3 0.114 0.34 0.10 0.02 0.10 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.43 FLOOD VOLUME (acft)0.67 FLOOD VOLUME (cuft)29,246 PEAK FLOW RATE (cfs)10.11 Developed 6 Hour Storm PROJECT: Job No.:2244 DATE: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3423 LAG TIME - MINUTES 1.09 MINIMUM LOSS RATE (for var. loss) - in/hr 0.171 1373.0 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 C 0.00317 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 0.039 0.604 0.033 0.006 0.03 2 30 0.50 0.3 0.059 0.597 0.050 0.009 0.05 3 45 0.75 0.3 0.059 0.590 0.050 0.009 0.05 4 60 1.00 0.4 0.078 0.584 0.066 0.012 0.07 5 75 1.25 0.3 0.059 0.577 0.050 0.009 0.05 6 90 1.50 0.3 0.059 0.570 0.050 0.009 0.05 7 105 1.75 0.3 0.059 0.563 0.050 0.009 0.05 8 120 2.00 0.4 0.078 0.556 0.066 0.012 0.07 9 135 2.25 0.4 0.078 0.549 0.066 0.012 0.07 10 150 2.50 0.4 0.078 0.543 0.066 0.012 0.07 11 165 2.75 0.5 0.098 0.536 0.083 0.015 0.08 12 180 3.00 0.5 0.098 0.530 0.083 0.015 0.08 13 195 3.25 0.5 0.098 0.523 0.083 0.015 0.08 14 210 3.50 0.5 0.098 0.517 0.083 0.015 0.08 15 225 3.75 0.5 0.098 0.510 0.083 0.015 0.08 16 240 4.00 0.6 0.117 0.504 0.100 0.018 0.10 17 255 4.25 0.6 0.117 0.497 0.100 0.018 0.10 18 270 4.50 0.7 0.137 0.491 0.116 0.020 0.12 19 285 4.75 0.7 0.137 0.485 0.116 0.020 0.12 20 300 5.00 0.8 0.156 0.478 0.133 0.023 0.13 21 315 5.25 0.6 0.117 0.472 0.100 0.018 0.10 22 330 5.50 0.7 0.137 0.466 0.116 0.020 0.12 23 345 5.75 0.8 0.156 0.460 0.133 0.023 0.13 24 360 6.00 0.8 0.156 0.454 0.133 0.023 0.13 25 375 6.25 0.9 0.176 0.448 0.149 0.026 0.15 26 390 6.50 0.9 0.176 0.442 0.149 0.026 0.15 27 405 6.75 1.0 0.195 0.436 0.166 0.029 0.17 28 420 7.00 1.0 0.195 0.430 0.166 0.029 0.17 29 435 7.25 1.0 0.195 0.424 0.166 0.029 0.17 30 450 7.50 1.1 0.215 0.418 0.183 0.032 0.18 31 465 7.75 1.2 0.234 0.413 0.199 0.035 0.20 32 480 8.00 1.3 0.254 0.407 0.216 0.038 0.22 33 495 8.25 1.5 0.293 0.401 0.249 0.044 0.25 34 510 8.50 1.5 0.293 0.396 0.249 0.044 0.25 35 525 8.75 1.6 0.312 0.390 0.265 0.047 0.27 36 540 9.00 1.7 0.332 0.385 0.282 0.050 0.28 37 555 9.25 1.9 0.371 0.379 0.315 0.056 0.32 38 570 9.50 2.0 0.390 0.374 0.332 0.017 0.09 39 585 9.75 2.1 0.410 0.369 0.348 0.041 0.24 40 600 10.00 2.2 0.429 0.363 0.365 0.066 0.38 41 615 10.25 1.5 0.293 0.358 0.249 0.044 0.25 42 630 10.50 1.5 0.293 0.353 0.249 0.044 0.25 43 645 10.75 2.0 0.390 0.348 0.332 0.043 0.24 44 660 11.00 2.0 0.390 0.343 0.332 0.048 0.27 45 675 11.25 1.9 0.371 0.338 0.315 0.033 0.19 46 690 11.50 1.9 0.371 0.333 0.315 0.038 0.22 47 705 11.75 1.7 0.332 0.328 0.282 0.004 0.02 48 720 12.00 1.8 0.351 0.323 0.299 0.029 0.16 49 735 12.25 2.5 0.488 0.318 0.415 0.170 0.97 50 750 12.50 2.6 0.508 0.313 0.431 0.194 1.10 51 765 12.75 2.8 0.547 0.308 0.465 0.238 1.35 52 780 13.00 2.9 0.566 0.304 0.481 0.262 1.49 53 795 13.25 3.4 0.664 0.299 0.564 0.364 2.07 54 810 13.50 3.4 0.664 0.295 0.564 0.369 2.09 55 825 13.75 2.3 0.449 0.290 0.382 0.159 0.90 56 840 14.00 2.3 0.449 0.286 0.382 0.163 0.93 57 855 14.25 2.7 0.527 0.281 0.448 0.246 1.39 58 870 14.50 2.6 0.508 0.277 0.431 0.230 1.31 59 885 14.75 2.6 0.508 0.273 0.431 0.235 1.33 60 900 15.00 2.5 0.488 0.269 0.415 0.219 1.24 MANUAL DEVELOPED CONDITION 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD PROJECT: Job No.:2244 DATE: BY:RRR 6/23/23 DRAINAGE AREA-ACRES 5.63 CONSTANT LOSS RATE-in/hr n/a UNIT TIME-MINUTES 15 VARIABLE LOSS RATE (AVG) in/hr 0.3423 LAG TIME - MINUTES 1.09 MINIMUM LOSS RATE (for var. loss) - in/hr 0.171 1373.0 LOW LOSS RATE - DECIMAL 0.85 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 C 0.00317 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 MANUAL DEVELOPED CONDITION 24-HOUR STORM UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM RCFC & WCD SYNTHETIC UNIT HYDROGRAPH METHOD HYDROLOGY SHORTCUT METHOD 63 945 15.75 1.9 0.371 0.257 0.315 0.114 0.65 64 960 16.00 1.9 0.371 0.253 0.315 0.118 0.67 65 975 16.25 0.4 0.078 0.249 0.066 0.012 0.07 66 990 16.50 0.4 0.078 0.245 0.066 0.012 0.07 67 1005 16.75 0.3 0.059 0.241 0.050 0.009 0.05 68 1020 17.00 0.3 0.059 0.238 0.050 0.009 0.05 69 1035 17.25 0.5 0.098 0.234 0.083 0.015 0.08 70 1050 17.50 0.5 0.098 0.231 0.083 0.015 0.08 71 1065 17.75 0.5 0.098 0.227 0.083 0.015 0.08 72 1080 18.00 0.4 0.078 0.224 0.066 0.012 0.07 73 1095 18.25 0.4 0.078 0.220 0.066 0.012 0.07 74 1110 18.50 0.4 0.078 0.217 0.066 0.012 0.07 75 1125 18.75 0.3 0.059 0.214 0.050 0.009 0.05 76 1140 19.00 0.2 0.039 0.211 0.033 0.006 0.03 77 1155 19.25 0.3 0.059 0.208 0.050 0.009 0.05 78 1170 19.50 0.4 0.078 0.205 0.066 0.012 0.07 79 1185 19.75 0.3 0.059 0.202 0.050 0.009 0.05 80 1200 20.00 0.2 0.039 0.200 0.033 0.006 0.03 81 1215 20.25 0.3 0.059 0.197 0.050 0.009 0.05 82 1230 20.50 0.3 0.059 0.194 0.050 0.009 0.05 83 1245 20.75 0.3 0.059 0.192 0.050 0.009 0.05 84 1260 21.00 0.2 0.039 0.190 0.033 0.006 0.03 85 1275 21.25 0.3 0.059 0.187 0.050 0.009 0.05 86 1290 21.50 0.2 0.039 0.185 0.033 0.006 0.03 87 1305 21.75 0.3 0.059 0.183 0.050 0.009 0.05 88 1320 22.00 0.2 0.039 0.181 0.033 0.006 0.03 89 1335 22.25 0.3 0.059 0.180 0.050 0.009 0.05 90 1350 22.50 0.2 0.039 0.178 0.033 0.006 0.03 91 1365 22.75 0.2 0.039 0.176 0.033 0.006 0.03 92 1380 23.00 0.2 0.039 0.175 0.033 0.006 0.03 93 1395 23.25 0.2 0.039 0.174 0.033 0.006 0.03 94 1410 23.50 0.2 0.039 0.173 0.033 0.006 0.03 95 1425 23.75 0.2 0.039 0.172 0.033 0.006 0.03 96 1440 24.00 0.2 0.039 0.171 0.033 0.006 0.03 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in)1.25 FLOOD VOLUME (acft)0.59 FLOOD VOLUME (cuft)25,564 PEAK FLOW (cfs)2.09 DRAINAGE AREA CONCENTRATION POINT DRAINAGE AREA-ACRES 5.63 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 DRYWELLS UNIT TIME-PERCENT OF LAG 504.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 1.98 DRYWELL PERCOLATION RATE 0.00 cfs Unit Time Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs 1 5 0.08 0.51 2.91 874 874 724 10 10 864 0.02 360.72 0 0.00 2 10 0.17 0.66 3.72 1,117 1,980 848 12 12 1,969 0.05 362.13 0 0.00 3 15 0.25 0.70 3.99 1,198 3,166 954 13 13 3,153 0.07 363.44 0 0.00 4 20 0.33 0.75 4.26 1,278 3,688 997 14 14 3,675 0.08 363.99 743 2.48 5 25 0.42 0.85 4.80 1,440 3,688 997 14 14 3,675 0.08 363.99 1,426 4.75 6 30 0.50 0.99 5.61 1,683 3,688 997 14 14 3,675 0.08 363.99 1,669 5.56 7 35 0.58 1.18 6.69 2,007 3,688 997 14 14 3,675 0.08 363.99 1,993 6.64 8 40 0.67 1.58 8.98 2,695 3,688 997 14 14 3,675 0.08 363.99 2,681 8.94 9 45 0.75 2.77 15.73 4,718 3,688 997 14 14 3,675 0.08 363.99 4,704 15.68 10 50 0.83 7.85 44.59 13,378 3,688 997 14 14 3,675 0.08 363.99 13,364 44.55 11 55 0.92 1.25 7.09 2,128 3,688 997 14 14 3,675 0.08 363.99 2,114 7.05 12 60 1.00 0.56 3.18 955 3,688 997 14 14 3,675 0.08 363.99 941 3.14 EFFECTIVE RAIN 1.64 in 0.77 acft 33,470 cuft TOTAL VOLUME RETAINED 3,834 cuft MAX WSEL 363.99 ft PEAK FLOW RATE 44.59 cfs AVERAGE PERCOLATION RATE 2.66 cf/min 29,635 cuft 98.78 cfs 13,364 cuft 44.55 cfs BASIN WORKSHEET SUMMARY PROJECT:RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 1 HOUR STORM Plate E-2.2 Incremental 1 Hour Storm PROJECT: DRAINAGE AREA-ACRES 5.63 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 DRYWELLS UNIT TIME-PERCENT OF LAG 504.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 2.59 0.00 cfs Unit Time Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out 1 5 0.08 0.06 0.4 105 105 286 4 4 101 0.00 359.28 0 0.00 2 10 0.17 0.06 0.4 105 206 429 6 6 200 0.00 359.55 0 0.00 3 15 0.25 0.05 0.3 87 288 544 8 8 280 0.01 359.77 0 0.00 4 20 0.33 0.12 0.7 211 491 668 9 9 482 0.01 360.17 0 0.00 5 25 0.42 0.12 0.7 211 693 697 10 10 683 0.02 360.46 0 0.00 6 30 0.50 0.22 1.2 370 1,053 750 10 10 1,043 0.02 360.97 0 0.00 7 35 0.58 0.12 0.7 211 1,254 772 11 11 1,243 0.03 361.23 0 0.00 8 40 0.67 0.22 1.2 370 1,613 810 11 11 1,602 0.04 361.68 0 0.00 9 45 0.75 0.22 1.2 370 1,971 847 12 12 1,960 0.04 362.12 0 0.00 10 50 0.83 0.12 0.7 211 2,171 866 12 12 2,159 0.05 362.35 0 0.00 11 55 0.92 0.15 0.9 264 2,423 889 12 12 2,410 0.06 362.63 0 0.00 12 60 1.00 0.22 1.2 370 2,780 922 13 13 2,767 0.06 363.04 0 0.00 13 65 1.08 0.34 1.9 582 3,349 969 13 13 3,335 0.08 363.63 0 0.00 14 70 1.17 0.34 1.9 582 3,688 997 14 14 3,675 0.08 363.99 228 0.76 15 75 1.25 0.34 1.9 582 3,688 997 14 14 3,675 0.08 363.99 568 1.89 16 80 1.33 0.28 1.6 476 3,688 997 14 14 3,675 0.08 363.99 462 1.54 17 85 1.42 0.47 2.6 793 3,688 997 14 14 3,675 0.08 363.99 779 2.60 18 90 1.50 0.50 2.8 846 3,688 997 14 14 3,675 0.08 363.99 832 2.77 19 95 1.58 0.40 2.3 687 3,688 997 14 14 3,675 0.08 363.99 674 2.25 20 100 1.67 0.50 2.8 846 3,688 997 14 14 3,675 0.08 363.99 832 2.77 21 105 1.75 0.68 3.9 1,164 3,688 997 14 14 3,675 0.08 363.99 1,150 3.83 22 110 1.83 0.62 3.5 1,058 3,688 997 14 14 3,675 0.08 363.99 1,044 3.48 23 115 1.92 0.56 3.2 952 3,688 997 14 14 3,675 0.08 363.99 938 3.13 24 120 2.00 0.59 3.4 1,005 3,688 997 14 14 3,675 0.08 363.99 991 3.30 25 125 2.08 0.62 3.5 1,058 3,688 997 14 14 3,675 0.08 363.99 1,044 3.48 26 130 2.17 0.96 5.5 1,640 3,688 997 14 14 3,675 0.08 363.99 1,626 5.42 27 135 2.25 1.21 6.9 2,064 3,688 997 14 14 3,675 0.08 363.99 2,050 6.83 28 140 2.33 0.75 4.2 1,270 3,688 997 14 14 3,675 0.08 363.99 1,256 4.19 29 145 2.42 1.77 10.1 3,016 3,688 997 14 14 3,675 0.08 363.99 3,003 10.01 30 150 2.50 1.93 10.9 3,281 3,688 997 14 14 3,675 0.08 363.99 3,267 10.89 31 155 2.58 2.21 12.5 3,757 3,688 997 14 14 3,675 0.08 363.99 3,744 12.48 32 160 2.67 1.49 8.5 2,540 3,688 997 14 14 3,675 0.08 363.99 2,526 8.42 33 165 2.75 0.28 1.6 476 3,688 997 14 14 3,675 0.08 363.99 462 1.54 34 170 2.83 0.22 1.2 370 3,688 997 14 14 3,675 0.08 363.99 356 1.19 35 175 2.92 0.22 1.2 370 3,688 997 14 14 3,675 0.08 363.99 356 1.19 363.99 34 0.11 EFFECTIVE RAIN TOTAL VOLUME RETAINED MAX WSEL PEAK FLOW RATE AVERAGE PERCOLATION RATE RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 3 HOUR STORM BASIN WORKSHEET SUMMARY Incremental 3 Hour Storm PROJECT: 6/23/23 DRAINAGE AREA-ACRES 5.63 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 DRYWELLS UNIT TIME-PERCENT OF LAG 504.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs 1 5 0.08 0.03 0.16 48 48 206 3 3 46 0.00 359.13 0 0.00 2 10 0.17 0.03 0.19 58 104 284 4 4 100 0.00 359.28 0 0.00 3 15 0.25 0.03 0.19 58 158 361 5 5 153 0.00 359.42 0 0.00 4 20 0.33 0.03 0.19 58 211 436 6 6 205 0.00 359.57 0 0.00 5 25 0.42 0.03 0.19 58 263 509 7 7 256 0.01 359.71 0 0.00 6 30 0.50 0.04 0.23 68 324 595 8 8 316 0.01 359.87 0 0.00 7 35 0.58 0.04 0.23 68 383 652 9 9 374 0.01 360.02 0 0.00 8 40 0.67 0.04 0.23 68 442 661 9 9 433 0.01 360.10 0 0.00 9 45 0.75 0.04 0.23 68 501 669 9 9 491 0.01 360.18 0 0.00 10 50 0.83 0.04 0.23 68 559 678 9 9 550 0.01 360.27 0 0.00 11 55 0.92 0.04 0.23 68 618 686 10 10 608 0.01 360.35 0 0.00 12 60 1.00 0.05 0.26 77 686 696 10 10 676 0.02 360.45 0 0.00 13 65 1.08 0.05 0.26 77 753 706 10 10 744 0.02 360.55 0 0.00 14 70 1.17 0.05 0.26 77 821 716 10 10 811 0.02 360.64 0 0.00 15 75 1.25 0.05 0.26 77 889 726 10 10 879 0.02 360.74 0 0.00 16 80 1.33 0.05 0.26 77 956 736 10 10 946 0.02 360.83 0 0.00 17 85 1.42 0.05 0.26 77 1,023 745 10 10 1,013 0.02 360.93 0 0.00 18 90 1.50 0.05 0.26 77 1,091 754 10 10 1,080 0.02 361.02 0 0.00 MANUAL RCFC & WCD HYDROLOGY SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITION BASIN STAGE STORAGE - 6 HOUR STORM Plate E-2.2 Incremental 6 Hour Storm PROJECT: 6/23/23 DRAINAGE AREA-ACRES 5.63 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 DRYWELLS UNIT TIME-PERCENT OF LAG 504.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs MANUAL RCFC & WCD HYDROLOGY SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITION BASIN STAGE STORAGE - 6 HOUR STORM 21 105 1.75 0.05 0.26 77 1,291 776 11 11 1,281 0.03 361.28 0 0.00 22 110 1.83 0.05 0.26 77 1,358 783 11 11 1,347 0.03 361.36 0 0.00 23 115 1.92 0.05 0.26 77 1,425 790 11 11 1,414 0.03 361.44 0 0.00 24 120 2.00 0.05 0.29 87 1,501 798 11 11 1,490 0.03 361.54 0 0.00 25 125 2.08 0.05 0.26 77 1,567 805 11 11 1,556 0.04 361.62 0 0.00 26 130 2.17 0.05 0.29 87 1,643 813 11 11 1,632 0.04 361.72 0 0.00 27 135 2.25 0.05 0.29 87 1,719 821 11 11 1,708 0.04 361.81 0 0.00 28 140 2.33 0.05 0.29 87 1,795 830 12 12 1,783 0.04 361.91 0 0.00 29 145 2.42 0.05 0.29 87 1,871 837 12 12 1,859 0.04 362.00 0 0.00 30 150 2.50 0.05 0.29 87 1,946 845 12 12 1,934 0.04 362.09 0 0.00 31 155 2.58 0.05 0.29 87 2,022 852 12 12 2,010 0.05 362.18 0 0.00 32 160 2.67 0.05 0.29 87 2,097 859 12 12 2,085 0.05 362.26 0 0.00 33 165 2.75 0.04 0.21 63 2,148 863 12 12 2,136 0.05 362.32 0 0.00 34 170 2.83 0.04 0.21 63 2,199 868 12 12 2,187 0.05 362.38 0 0.00 35 175 2.92 0.04 0.21 63 2,250 873 12 12 2,237 0.05 362.44 0 0.00 36 180 3.00 0.04 0.21 63 2,300 878 12 12 2,288 0.05 362.49 0 0.00 37 185 3.08 0.04 0.21 63 2,351 882 12 12 2,339 0.05 362.55 0 0.00 38 190 3.17 0.07 0.42 127 2,466 893 12 12 2,454 0.06 362.68 0 0.00 39 195 3.25 0.07 0.42 127 2,581 904 13 13 2,569 0.06 362.81 0 0.00 40 200 3.33 0.07 0.42 127 2,696 915 13 13 2,683 0.06 362.95 0 0.00 41 205 3.42 0.11 0.64 192 2,875 930 13 13 2,862 0.07 363.14 0 0.00 42 210 3.50 0.15 0.86 257 3,119 950 13 13 3,106 0.07 363.39 0 0.00 43 215 3.58 0.19 1.07 321 3,427 975 14 14 3,413 0.08 363.71 0 0.00 44 220 3.67 0.19 1.07 321 3,688 997 14 14 3,675 0.08 363.99 46 0.15 45 225 3.75 0.23 1.29 386 3,688 997 14 14 3,675 0.08 363.99 372 1.24 46 230 3.83 0.23 1.29 386 3,688 997 14 14 3,675 0.08 363.99 372 1.24 47 235 3.92 0.26 1.50 450 3,688 997 14 14 3,675 0.08 363.99 436 1.45 48 240 4.00 0.26 1.50 450 3,688 997 14 14 3,675 0.08 363.99 436 1.45 49 245 4.08 0.30 1.72 515 3,688 997 14 14 3,675 0.08 363.99 501 1.67 50 250 4.17 0.34 1.93 580 3,688 997 14 14 3,675 0.08 363.99 566 1.89 51 255 4.25 0.38 2.15 644 3,688 997 14 14 3,675 0.08 363.99 630 2.10 52 260 4.33 0.42 2.36 709 3,688 997 14 14 3,675 0.08 363.99 695 2.32 53 265 4.42 0.45 2.58 773 3,688 997 14 14 3,675 0.08 363.99 759 2.53 363.99 759 2.53 Plate E-2.2 Incremental 6 Hour Storm PROJECT: 6/23/23 DRAINAGE AREA-ACRES 5.63 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.99 DRYWELLS UNIT TIME-PERCENT OF LAG 504.8 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 3.16 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs MANUAL RCFC & WCD HYDROLOGY SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITION BASIN STAGE STORAGE - 6 HOUR STORM 363.99 824 2.75 56 280 4.67 0.53 3.01 902 3,688 997 14 14 3,675 0.08 363.99 889 2.96 57 285 4.75 0.57 3.22 967 3,688 997 14 14 3,675 0.08 363.99 953 3.18 58 290 4.83 0.57 3.22 967 3,688 997 14 14 3,675 0.08 363.99 953 3.18 59 295 4.92 0.61 3.44 1,032 3,688 997 14 14 3,675 0.08 363.99 1,018 3.39 60 300 5.00 0.64 3.65 1,096 3,688 997 14 14 3,675 0.08 363.99 1,082 3.61 61 305 5.08 0.83 4.73 1,419 3,688 997 14 14 3,675 0.08 363.99 1,405 4.68 62 310 5.17 1.02 5.81 1,742 3,688 997 14 14 3,675 0.08 363.99 1,728 5.76 63 315 5.25 1.14 6.45 1,936 3,688 997 14 14 3,675 0.08 363.99 1,922 6.41 64 320 5.33 1.25 7.10 2,129 3,688 997 14 14 3,675 0.08 363.99 2,116 7.05 65 325 5.42 1.44 8.17 2,452 3,688 997 14 14 3,675 0.08 363.99 2,439 8.13 66 330 5.50 1.78 10.11 3,034 3,688 997 14 14 3,675 0.08 363.99 3,020 10.07 67 335 5.58 0.38 2.15 644 3,688 997 14 14 3,675 0.08 363.99 630 2.10 68 340 5.67 0.05 0.29 87 3,688 997 14 14 3,675 0.08 363.99 73 0.24 69 345 5.75 0.03 0.19 58 3,688 997 14 14 3,675 0.08 363.99 44 0.15 70 350 5.83 0.03 0.16 48 3,688 997 14 14 3,675 0.08 363.99 35 0.12 71 355 5.92 0.02 0.10 29 3,688 997 14 14 3,675 0.08 363.99 15 0.05 72 360 6.00 0.01 0.06 19 3,688 997 14 14 3,675 0.08 363.99 6 0.02 EFFECTIVE RAIN TOTAL VOLUME RETAINED MAX WSEL PEAK FLOW RATE AVERAGE PERCOLATION RATE BASIN WORKSHEET SUMMARY Plate E-2.2 Incremental 6 Hour Storm PROJECT: DRAINAGE AREA DRAINAGE AREA-ACRES 5.63 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 15 LAG TIME - MINUTES 0.99 DRYWELLS UNIT TIME-PERCENT OF LAG 1514.3 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 DRYWELL PERCOLATION RATE 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs 1 15 0.25 0.006 0.0 30 30 180 8 8 22 0.00 359.06 0 0.00 2 30 0.50 0.009 0.0 45 67 233 10 10 58 0.00 359.16 0 0.00 3 45 0.75 0.009 0.0 45 102 283 12 12 91 0.00 359.25 0 0.00 4 60 1.00 0.012 0.1 60 151 350 15 15 136 0.00 359.38 0 0.00 5 75 1.25 0.009 0.0 45 181 393 16 16 164 0.00 359.45 0 0.00 6 90 1.50 0.009 0.0 45 209 433 18 18 191 0.00 359.53 0 0.00 7 105 1.75 0.009 0.0 45 236 471 20 20 216 0.00 359.60 0 0.00 8 120 2.00 0.012 0.1 60 276 528 22 22 254 0.01 359.70 0 0.00 9 135 2.25 0.012 0.1 60 314 581 24 24 290 0.01 359.80 0 0.00 10 150 2.50 0.012 0.1 60 350 632 26 26 323 0.01 359.89 0 0.00 11 165 2.75 0.015 0.1 75 398 654 27 27 371 0.01 360.01 0 0.00 12 180 3.00 0.015 0.1 75 446 661 28 28 418 0.01 360.08 0 0.00 13 195 3.25 0.015 0.1 75 493 668 28 28 465 0.01 360.15 0 0.00 14 210 3.50 0.015 0.1 75 540 675 28 28 512 0.01 360.21 0 0.00 15 225 3.75 0.015 0.1 75 587 682 28 28 558 0.01 360.28 0 0.00 16 240 4.00 0.018 0.1 90 648 691 29 29 619 0.01 360.37 0 0.00 17 255 4.25 0.018 0.1 90 709 700 29 29 680 0.02 360.45 0 0.00 18 270 4.50 0.020 0.1 105 785 711 30 30 755 0.02 360.56 0 0.00 19 285 4.75 0.020 0.1 105 860 722 30 30 830 0.02 360.67 0 0.00 20 300 5.00 0.023 0.1 120 949 735 31 31 919 0.02 360.80 0 0.00 21 315 5.25 0.018 0.1 90 1,008 743 31 31 977 0.02 360.88 0 0.00 22 330 5.50 0.020 0.1 105 1,082 753 31 31 1,051 0.02 360.98 0 0.00 23 345 5.75 0.023 0.1 120 1,171 763 32 32 1,139 0.03 361.10 0 0.00 24 360 6.00 0.023 0.1 120 1,258 772 32 32 1,226 0.03 361.21 0 0.00 25 375 6.25 0.026 0.1 135 1,361 783 33 33 1,328 0.03 361.34 0 0.00 26 390 6.50 0.026 0.1 135 1,463 794 33 33 1,430 0.03 361.46 0 0.00 27 405 6.75 0.029 0.2 150 1,579 807 34 34 1,546 0.04 361.61 0 0.00 28 420 7.00 0.029 0.2 150 1,695 819 34 34 1,661 0.04 361.76 0 0.00 29 435 7.25 0.029 0.2 150 1,811 831 35 35 1,776 0.04 361.90 0 0.00 30 450 7.50 0.032 0.2 165 1,941 844 35 35 1,906 0.04 362.06 0 0.00 31 465 7.75 0.035 0.2 180 2,085 858 36 36 2,049 0.05 362.22 0 0.00 32 480 8.00 0.038 0.2 194 2,244 872 36 36 2,208 0.05 362.40 0 0.00 33 495 8.25 0.044 0.2 224 2,432 890 37 37 2,395 0.05 362.62 0 0.00 34 510 8.50 0.044 0.2 224 2,619 908 38 38 2,581 0.06 362.83 0 0.00 35 525 8.75 0.047 0.3 239 2,821 925 39 39 2,782 0.06 363.05 0 0.00 36 540 9.00 0.050 0.3 254 3,037 943 39 39 2,997 0.07 363.28 0 0.00 37 555 9.25 0.056 0.3 284 3,281 963 40 40 3,241 0.07 363.53 0 0.00 38 570 9.50 0.017 0.1 85 3,326 967 40 40 3,286 0.08 363.58 0 0.00 39 585 9.75 0.041 0.2 212 3,497 981 41 41 3,456 0.08 363.76 0 0.00 40 600 10.00 0.066 0.4 338 3,688 997 42 42 3,647 0.08 363.96 106 0.12 41 615 10.25 0.044 0.2 224 3,688 997 42 42 3,647 0.08 363.96 183 0.20 42 630 10.50 0.044 0.2 224 3,688 997 42 42 3,647 0.08 363.96 183 0.20 43 645 10.75 0.043 0.2 218 3,688 997 42 42 3,647 0.08 363.96 177 0.20 44 660 11.00 0.048 0.3 244 3,688 997 42 42 3,647 0.08 363.96 203 0.23 363.96 129 0.14 RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 24 HOUR STORM Plate E-2.2 Incremental 24 Hour Storm PROJECT: DRAINAGE AREA DRAINAGE AREA-ACRES 5.63 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 15 LAG TIME - MINUTES 0.99 DRYWELLS UNIT TIME-PERCENT OF LAG 1514.3 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 DRYWELL PERCOLATION RATE 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 24 HOUR STORM 363.96 154 0.17 47 705 11.75 0.004 0.0 22 3,669 995 41 41 3,627 0.08 363.94 0 0.00 48 720 12.00 0.029 0.2 146 3,688 997 42 42 3,647 0.08 363.96 85 0.09 49 735 12.25 0.170 1.0 869 3,688 997 42 42 3,647 0.08 363.96 827 0.92 50 750 12.50 0.194 1.1 993 3,688 997 42 42 3,647 0.08 363.96 951 1.06 51 765 12.75 0.238 1.4 1,217 3,688 997 42 42 3,647 0.08 363.96 1,175 1.31 52 780 13.00 0.262 1.5 1,340 3,688 997 42 42 3,647 0.08 363.96 1,298 1.44 53 795 13.25 0.364 2.1 1,862 3,688 997 42 42 3,647 0.08 363.96 1,821 2.02 54 810 13.50 0.369 2.1 1,885 3,688 997 42 42 3,647 0.08 363.96 1,844 2.05 55 825 13.75 0.159 0.9 811 3,688 997 42 42 3,647 0.08 363.96 770 0.86 56 840 14.00 0.163 0.9 834 3,688 997 42 42 3,647 0.08 363.96 792 0.88 57 855 14.25 0.246 1.4 1,255 3,688 997 42 42 3,647 0.08 363.96 1,213 1.35 58 870 14.50 0.230 1.3 1,177 3,688 997 42 42 3,647 0.08 363.96 1,136 1.26 59 885 14.75 0.235 1.3 1,199 3,688 997 42 42 3,647 0.08 363.96 1,157 1.29 60 900 15.00 0.219 1.2 1,120 3,688 997 42 42 3,647 0.08 363.96 1,079 1.20 61 915 15.25 0.204 1.2 1,042 3,688 997 42 42 3,647 0.08 363.96 1,000 1.11 62 930 15.50 0.188 1.1 963 3,688 997 42 42 3,647 0.08 363.96 921 1.02 63 945 15.75 0.114 0.6 584 3,688 997 42 42 3,647 0.08 363.96 542 0.60 64 960 16.00 0.118 0.7 604 3,688 997 42 42 3,647 0.08 363.96 563 0.63 65 975 16.25 0.012 0.1 60 3,688 997 42 42 3,647 0.08 363.96 18 0.02 66 990 16.50 0.012 0.1 60 3,688 997 42 42 3,647 0.08 363.96 18 0.02 67 1005 16.75 0.009 0.0 45 3,688 997 42 42 3,647 0.08 363.96 3 0.00 68 1020 17.00 0.009 0.0 45 3,688 997 42 42 3,647 0.08 363.96 3 0.00 69 1035 17.25 0.015 0.1 75 3,688 997 42 42 3,647 0.08 363.96 33 0.04 70 1050 17.50 0.015 0.1 75 3,688 997 42 42 3,647 0.08 363.96 33 0.04 71 1065 17.75 0.015 0.1 75 3,688 997 42 42 3,647 0.08 363.96 33 0.04 72 1080 18.00 0.012 0.1 60 3,688 997 42 42 3,647 0.08 363.96 18 0.02 73 1095 18.25 0.012 0.1 60 3,688 997 42 42 3,647 0.08 363.96 18 0.02 74 1110 18.50 0.012 0.1 60 3,688 997 42 42 3,647 0.08 363.96 18 0.02 75 1125 18.75 0.009 0.0 45 3,688 997 42 42 3,647 0.08 363.96 3 0.00 76 1140 19.00 0.006 0.0 30 3,677 996 42 42 3,635 0.08 363.94 0 0.00 77 1155 19.25 0.009 0.0 45 3,680 996 42 42 3,639 0.08 363.95 0 0.00 78 1170 19.50 0.012 0.1 60 3,688 997 42 42 3,647 0.08 363.96 10 0.01 79 1185 19.75 0.009 0.0 45 3,688 997 42 42 3,647 0.08 363.96 3 0.00 80 1200 20.00 0.006 0.0 30 3,677 996 42 42 3,635 0.08 363.94 0 0.00 81 1215 20.25 0.009 0.0 45 3,680 996 42 42 3,639 0.08 363.95 0 0.00 82 1230 20.50 0.009 0.0 45 3,684 997 42 42 3,642 0.08 363.95 0 0.00 83 1245 20.75 0.009 0.0 45 3,687 997 42 42 3,645 0.08 363.96 0 0.00 84 1260 21.00 0.006 0.0 30 3,675 996 41 41 3,634 0.08 363.94 0 0.00 85 1275 21.25 0.009 0.0 45 3,679 996 42 42 3,637 0.08 363.95 0 0.00 86 1290 21.50 0.006 0.0 30 3,667 995 41 41 3,626 0.08 363.93 0 0.00 87 1305 21.75 0.009 0.0 45 3,671 996 41 41 3,629 0.08 363.94 0 0.00 88 1320 22.00 0.006 0.0 30 3,659 995 41 41 3,618 0.08 363.93 0 0.00 89 1335 22.25 0.009 0.0 45 3,662 995 41 41 3,621 0.08 363.93 0 0.00 Plate E-2.2 Incremental 24 Hour Storm PROJECT: DRAINAGE AREA DRAINAGE AREA-ACRES 5.63 BASIN PERCOLATION RATE 2.0 in/hr UNIT TIME-MINUTES 15 LAG TIME - MINUTES 0.99 DRYWELLS UNIT TIME-PERCENT OF LAG 1514.3 NUMBER 0 TOTAL ADJUSTED STORM RAIN-INCHES 4.88 DRYWELL PERCOLATION RATE 0.00 cfs Unit Time Effective Flood Volume Basin Basin Period Minutes Hours Rain Hydrograph In Volume Percolation Maximum Percolation WSEL Volume Flow Flow Area Percolation Out Out Out in/hr cfs cu-ft cu-ft sf cu-ft cu-ft cu-ft ac-ft ft cu-ft cfs RCFC & WCD HYDROLOGY MANUAL SYNTHETIC UNIT HYDROGRAPH METHOD DEVELOPED CONDITIONS BASIN STAGE STORAGE - 24 HOUR STORM 92 1380 23.00 0.006 0.0 30 3,628 992 41 41 3,587 0.08 363.89 0 0.00 93 1395 23.25 0.006 0.0 30 3,617 991 41 41 3,575 0.08 363.88 0 0.00 94 1410 23.50 0.006 0.0 30 3,605 990 41 41 3,564 0.08 363.87 0 0.00 95 1425 23.75 0.006 0.0 30 3,594 989 41 41 3,553 0.08 363.86 0 0.00 96 1440 24.00 0.006 0.0 30 3,583 988 41 41 3,541 0.08 363.85 0 0.00 EFFECTIVE RAIN TOTAL VOLUME RETAINED MAX WSEL PEAK FLOW RATE AVERAGE PERCOLATION RATE BASIN WORKSHEET SUMMARY Plate E-2.2 Incremental 24 Hour Storm PROECT JOB No. BASIN CHARACTERISTICS CONTOUR ELEVATION INCR TOTAL INCR TOTAL INCR (ft)(ft)(sf)(sf)(cuft)(cuft)(acre-ft) 359 0 0 138 0 0 0.00 360 1 1 511 649 362 362 0.01 361 1 2 102 751 699 1,061 0.02 362 1 3 85 836 793 1,855 0.04 363 1 4 82 918 877 2,731 0.06 364 1 5 79 997 957 3,688 0.08 WHERE: BASIN VOLUME WORKSHEET ()()2121213 1 AAAAEEV++−= Basin Characteristics THE LIVING DESERT - PHASE 3 FINAL HYDROLOGY REPORT Appendix F Existing Conditions Exhibit MSA CONSULTING, INC. Civil Engineering Land Surveying Landscape ArchitecturePlanning Environmental Services Dry Utility Coordination GIS 34200 Bob Hope Drive Rancho Mirage, CA 92270 | 760.320.9811 | MSAConsultinginc.com R: \ 2 2 4 4 \ A C A D \ H y d r o l o g y \ P r o j e c t 3 \ 2 2 4 4 P h a s e 3 E x i s t i n g C o n d i t i o n s E x h i b i t . d w g , 6 / 2 3 / 2 0 2 3 4 : 4 4 : 1 1 P M , r r e e d , M S A C o n s u l t i n g , I n c . THE LIVING DESERT - PHASE 3 FINAL HYDROLOGY REPORT Appendix G Hydrology Exhibit MSA CONSULTING, INC. Civil Engineering Land Surveying Landscape ArchitecturePlanning Environmental Services Dry Utility Coordination GIS 34200 Bob Hope Drive Rancho Mirage, CA 92270 | 760.320.9811 | MSAConsultinginc.com R: \ 2 2 4 4 \ A C A D \ H y d r o l o g y \ P r o j e c t 3 \ 2 2 4 4 P h a s e 3 P r e l i m i n a r y D r a i n a g e E x h i b i t . d w g , 6 / 2 3 / 2 0 2 3 1 : 3 9 : 0 5 P M , r r e e d , M S A C o n s u l t i n g , I n c .