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HomeMy WebLinkAboutAppendix E Hydrology Report and Water Quality Management PlanWQMP AND CONCEPTUAL HYDROLOGY REPORT FOR TRACT NO. 20580 FONTANA, CA DECEMBER 15, 2022 Prepared by: United Civil, Inc. 30141 Agoura Road, Suite 215 Agoura Hills, CA 91301-4311 Tel: (818) 707-8648 Fax: (818) 707-864 TABLE OF CONTENTS  1. Introduction ......................................................................................................... 1                  1.1. Project Description ............................................................................. 1                  1.2. Study Objectives ................................................................................. 1  2. Hydrologic Data .................................................................................................... 1  3. Methodology ........................................................................................................ 2  4. Drainage Analysis ................................................................................................. 2                  4.1. Existing Condition ............................................................................... 2                  4.2. Proposed Condition ............................................................................ 2  5. Detention ............................................................................................................. 3  6. Water Quality Management Plan (WQMP) .......................................................... 3  7. Conclusion ............................................................................................................ 4  8. References ........................................................................................................... 4  TABLES  Table 1 ‐ Existing Hydrology Summary  Table 2 ‐ Proposed Hydrology Summary   Table 3 ‐ Detention System Summary  Table 4 ‐ Detention Outlet Pipe Calculation  Table 5 ‐ Detention System Stage‐Volume_Discharge Relation    Table 6 ‐ Detention System Routing   Table 7 ‐ WQMP Infiltration System Summary  Table 8 ‐ WQMP Infiltration System Drawdown Calculation  APPENDIX  Appendix A ‐ Vicinity Map  Appendix B – Master Hydrology Excerpts (TR No. 17389)  Appendix C – Hydrologic Data and Design Criteria  Appendix D – Rational Method Calculation  Appendix E – Unit Hydrograph Calculation    Appendix F – Hydrograph Routing Calculation   Appendix G – Soil Report Excerpts   Appendix H – Design Capture Volume (DCV) Calculation     Hydrology Maps       1  1. Introduction 1.1 Project Description The 6.84-acre site is located in the City of Fontana, San Bernardino County, California. The proposed project is located at the Northwest corner of Chase Road. The site is bounded by the developed Tract No. 16724 on the north, Tract No. 18244 on the south, Tract No. 12314 on the west, and Tract No. 17389 on the east (Appendix A). Currently, the site is vacant. Vegetation mainly includes dense weeds. The topo generally slopes in the south and southwest direction. The proposed site consists of 48 single family residential units and a playground. The offsite storm drain improvement plans of Tract No. 17389 included storm drain along the south of the site that was designed to accept the flows from the site [1,2] (Appendix B). Due to the intensified density, proposed peak flow is larger than that specified in master storm drain plan. Thus, an underground detention system is proposed to mitigate the increased flow. To satisfy Water Quality Management Plan (WQMP) requirement of San Bernadino County [3], a separate underground retention system is proposed to infiltrate the Design Capture Volume (DCV) of the site. 1.2 Study Objectives This report was prepared to: 1) Determine 100-year 24-hour peak flow of existing and proposed conditions of the site. 2) Design underground detention system to mitigate increased 100-year peak flow due to intensified density. 3) Design underground infiltration system to satisfy WQMP requirement. The DCV for WQMP was calculated in separate WQMP report [4]. 2. Hydrologic Data The project site is in San Bernardino County’s Valley Area. Per the NOAA Atlas 14 Point Precipitation Frequency Estimates [5], the 100-year 1-hour, 6-hour, and 24-hour isohyet are 1.65, 4.28, and 8.05 inches, respectively (Appendix C). The slope for rainfall intensity curve is 0.6. The soil group is type A, per the San Bernardino County’s Hydrology Manual [6]. Soil Group A typically has a low runoff potential with high infiltration rate. Antecedent Moisture Condition (AMC) II is used for storm drain system design. The proposed development type is condominium. The curve numbers (CN) for the existing and proposed conditions are 50 and 32, respectively, per San Bernadino County’s Hydrology Manual [6]. 2    3. Methodology San Bernardino County's hydrology methods, available in the software programs of CiviICadd/CivilDesign (Version 7.1) [7], were used for hydrology calculations. Rational Method program was used to calculate Time of Concentration (TC). The hydrograph was calculated using the Unit Hydrograph Method program based on Tc obtained from Rational Method. The detention system routing was calculated by the Flood Hydrograph Routing program, which uses the hydrograph generated from Unit Hydrograph Method. 4. Drainage Analysis 4.1 Existing Condition The site is currently vacant. Based on drainage paths, the onsite runoff flows from high point at northeast area towards the low point at southwest boundary (See Hydrology Map). Tc calculated by Rational method is provided in Appendix D. The results are summarized in Table 1. 4.2 Proposed Condition The proposed onsite drainage is a combination of surface flow, street and gutter flow, catch basin/inlet, and storm drain. Drainage is designed to be discharged to underground chamber systems located at south and southwest of the site. Low flow will be diverted to infiltration chamber while high flow will bypass and be discharged to the detention chamber. Based on drainage pattern, the onsite drainage can be divided into three subareas (see Hydrology Map). Subarea A Runoff from the lots surface flows onto Cascade Drive, then flows westerly along the gutter into a catch basin. Runoff continues southerly through the storm drain on “A” Drive into the diversion structure at southwest corner of the site. Subarea B Runoff from the lots surface flows onto “B” Drive and drains southerly along the gutter into a catch basin and is conveyed to the storm drain. Runoff continues in the storm drain on “C” Drive and flows to the diversion structure. Subarea C 3    Runoff from the lots surface flows onto “C” Drive and drains westerly along the gutter into a catch basin and is conveyed into the storm drain. Runoff continues through the storm drain into the diversion structure. At the diversion structure, low flow is diverted to a concrete box where flow is filtered then conveyed into the infiltration trench. High flow bypasses and drains into the underground detention trench. The detained water is released through an 18” outlet pipe at the rate not exceeding 90% of the existing flow. There is no offsite drainage contributing to the site. Tc calculated by Rational method is provided in Appendix D and summarized in Table 2. Confluence flow calculated by Unit Hydrograph method is provided in Appendix E. 5. Detention Per the hydrology report of Tract No. 17389, the project site is designated for residential development with density of 3-4 units/acre, for which the 100-year peak flow is 20.07 cfs (Appendix B). In current design, the site is proposed for condominium, for which the proposed 100-year peak flow is 28.77 cfs (Appendix D). To mitigate the increased flow, an underground detention system is proposed. Onsite high flow that bypasses the diversion structure drains into the detention system. This system consists of an underground 72” CMP pipe in the trench, with an 18” outlet pipe. The trench is sized to detain the peak flow (Table 3) The slope of the outlet pipe is designed such that maximum of 20.07 cfs can be discharged (Table 4, Appendix F). The detention system’s stage-volume-discharge relation is provided in Table 5. The hydrograph generated from the Unit Hydrograph calculation (Appendix E) was routed through this detention system. The resulted maximum water surface is 6.45’, and the maximum outflow is 20.07 cfs (Table 6, Appendix F). 6. Water Quality Management Plan (WQMP) Per the soil report [8] of the stie, the site has a measured infiltration rate of 15.24 in/hr for projected infiltration locations (Appendix G), which makes infiltration-based CMP feasible. An underground infiltration system with perforated CMP pipes is proposed. A factor of safety of 2.625 is applied to calculate the design infiltration rate [4]. The DCV is 21,232 cf, per the WQMP report [4] (Appendix H). Onsite flow is routed through the storm drain system into the diversion structure, where low flow is filtered via filter insert and discharged into the infiltration trench. This trench consists of four (4) rows of 77’ long 84”-diam perforated CMP pipes in a 79’x39’x8’ trench (Table 7). There is 12” gravel layer placed underneath the pipes, A 3’ depth dirt cover is on the top of the trench. The DCV can be infiltrated in 8.7 hours (Table 8) 4    7. Conclusion The 100-year Tc of the existing and the proposed conditions were calculated for onsite tributary areas using the San Bernardino County Rational Method. The peak flow and hydrograph were calculated using the County’s Unit Hydrograph Method. Flood routing was performed using the County’s Flood Routing Method. Onsite storm drain system including inlets and pipes are proposed to intercept, convey, and discharge onsite runoff. Underground infiltration system is proposed to treat the first flush of stormwater required by WQMP. Another underground detention system is proposed to mitigate the increased peak flow to maintain the allowable outflow designated by the master storm drain plan. Thus, the proposed project does not have negative impacts to the surrounding area. 8. References 1. Hydrology & Hydraulics Report, Tract No. 17389, Allard Engineering, Revised September 6, 2011. 2. Offsite Storm Drain Improvement Plans, Tract No. 17389, City of Fontana, Allard Engineering, November 16, 2011 3. Technical Guidance Document for Water Quality Management Plans, The County of San Bernadino Areawide Stormwater Program, NPDES No. CAS618036, Order No. R8-2010-0036, CDM Smith Inc., June 7, 2013 4. Water Quality Management Plan, Tract No. 20580, United Civil Inc., October 21, 2022 5. https://hdsc.nws.noaa.gov/hdsc/pfds/ 6. San Bernardino County Hydrology Manual, August 1986. 7. CivilDesign Engineering Software, Version 7.1 8. Geologic and Geotechnical Engineering Investigation Report Proposed SFD Residential Development, North Corner of Chase Road & Aria Lane, Fontana, California, Ridge Crest Real Estate, LLC., July 19, 2022. Table 1 – Existing Hydrology Summary Subarea Area Length Soil Group Rain 1-hr 100-YR AMC 100-YR CN (AMC 2) IMP(1) Tc Q100 (2) (ac) (ft) (in) (min) (cfs) A 6.84 837 A 1.65 2 50 0 22.8 14.84 (1)Undeveloped (2)Rational Method Table 2 – Proposed Hydrology Summary Subarea Area Length Soil Group Rain 1-hr 100-YR AMC 100-YR CN (AMC 2) IMP(1) Tc Q100 (2) (ac) (ft) (in) (min) (cfs) A 3.43 1020 A 1.65 2 32 65 10.2 13.74 B 1.79 762 A 1.65 2 32 65 8.6 8.46 C 1.62 456 A 1.65 2 32 65 7.6 7.96 CONF. 6.84 A 1.65 2 32 65 8.6 28.77 (1) Condominium (2) Rational Method Table 3 – Detention System Summary Tributary Area Allowable Q100(1) Proposed Q100 (2) Pipe Length Pipe Diameter # of Rows Trench Length Trench Width Trench Depth Outlet Pipe (ac) (cfs) (cfs) (ft) (in) (ft) (ft) (ft) (in) 6.84 20.07 28.72 92 72 1 94 8 6.5 18 (1) Master SD line (2)Unit Hydrograph Method Table 4 – Detention Outlet Pipe Calculation (D=18”, S=0.0365) Water Depth Outflow (ft) (cfs) 0 0 0.5 4.81 1 15.73 1.5 20.07   Table 5 – Detention System Stage-Volume-Discharge Relation (CMP D=72”, L=92’, Outlet Pipe D=18”) Depth from Trench Bottom Pipe Area Pipe Volume Trench Volume Total Volume Total Volume Q Out (ft) (sf) (cf) (cf) (cf) (ac-ft) (cfs) 0 0 0 0 0 0 0 0.5 0 0 150 150 0.003 0 1 1.1 104 259 363 0.008 4.81 1.5 3.1 285 337 622 0.014 15.73 2 5.5 509 398 907 0.021 20.07 2.5 8.3 759 448 1207 0.028 20.07 3 11.2 1026 492 1518 0.035 20.07 3.5 14.1 1301 532 1833 0.042 20.07 4 17.1 1575 573 2148 0.049 20.07 4.5 20.0 1842 617 2459 0.056 20.07 5 22.8 2093 667 2760 0.063 20.07 5.5 25.2 2317 728 3044 0.070 20.07 6 27.2 2498 806 3303 0.076 20.07 6.5 28.3 2601 915 3516 0.081 20.07 Table 6 – Detention System Routing   Site Area Peak Inflow Peak Outflow Maximum Water Depth Drawdown Time (ac) (cfs) (cfs) (ft) (hr) 6.84 28.72 20.07 6.45 8.45 Table 7 – WQMP Infiltration System Summary Site Area DCV (1) Pipe Length Pipe Diameter # of Rows Trench Length Trench Width Depth Below Pipe 3-hr Filling Pipe Volume Trench Volume Total Volume Provided (ac) (cf) (ft) (in) (ft) (ft) (ft) (cf) (cf) (cf) (cf) 6.84 21,232 77 84 4 79 39 1 4,472 11,847 5,120 21,439 (1) See separate WQMP report Table 8 – WQMP Infiltration System Drawdown Calculation Area Retention Volume Infiltration Rate FS Effective Infiltration Average Contact Area Drawdown Time (ac) (cf) (in/hr) (in/hr) (sf) (hr) 6.84 16,968 15.24 2.625 5.81 4,025 8.7           APPENDIX A    VICINITY MAP            APPENDIX B  MASTER STORM DRAIN EXCERPTS (TR NO. 1789) 40 do ALLAFlD ENGINEERING m Boa wmny lana nes gy & Hydraulics 6253 Sierra Ave, Fontana, CA 92335 • (909) 356-1815 • (909) 356-1795 IN MAINLINE TC(MIN.) = 13.08 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.865 t SUBAREA LOSS RATE DATA(AMC II): IN DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN No RESIDENTIAL io "3-4 DWELLINGS/ACRE" A 6.80 0.98 0.600 32 SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98 OK SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.600 SUBAREA AREA(ACRES) = 6.80 SUBAREA RUNOFF(CFS) = 20.07 iM EFFECTIVE AREA(ACRES) = 33.84 AREA-AVERAGED Fm(INCH/HR) = 0.53 AREA-AVERAGED Fp(INCH/HR) = 0.97 AREA-AVERAGED Ap = 0.55 am TOTAL AREA(ACRES) = 36.3 PEAK FLOW RATE(CFS) = 101.52 ow w. FLOW PROCESS FROM NODE 1.91 TO NODE 1.91 IS CODE = 81 ADDITION OF SUBAREA TO MAINLINE PEAK FLOW««< MAINLINE Tc(MIN.) = 13.08 to * 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.865 SUBAREA LOSS RATE DATA(AMC II): DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN COMMERCIAL A 1.00 0.98 0.100 32 SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98 SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100 SUBAREA AREA(ACRES) = 1.00 SUBAREA RUNOFF(CFS) = 3.39 EFFECTIVE AREA(ACRES) = 34.84 AREA-AVERAGED Fm(INCH/HR) = 0.52 AREA-AVERAGED Fp(INCH/HR) = 0.97 AREA-AVERAGED Ap = 0.53 TOTAL AREA(ACRES) = 37.3 PEAK FLOW RATE(CFS) = 104.91 am FLOW PROCESS FROM NODE 1.91 TO NODE 1.92 IS CODE = 31 COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA««< USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW) ««< im ELEVATION DATA: UPSTREAM(FEET) = 1404.70 DOWNSTREAM(FEET) = 1398.70 1rw FLOW LENGTH(FEET) = 420.00 MANNING'S N = 0.013 DEPTH OF FLOW IN 42.0 INCH PIPE IS 32.6 INCHES PIPE-FLOW VELOCITY(FEET/SEC.) = 13.11 ESTIMATED PIPE DIAMETER(INCH) = 42.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 104.91 PIPE TRAVEL TIME(MIN.) = 0.53 Tc(MIN.) = 13.62 LONGEST FLOWPATH FROM NODE 3.10 TO NODE 1.92 = 3091.00 FEET. FLOW PROCESS FROM NODE 1.92 TO NODE 1.92 IS CODE = 81 AA t------------------------------------------------------- ADDITION OF SUBAREA TO MAINLINE PEAK FLOW««< MAINLINE Tc(MIN.) = 13.62 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.774 SUBAREA LOSS RATE DATA(AMC II): DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN 38 0 wr APPENDIX C  HYDOLOGIC DATA AND DESIGN  CRITERIA  8/11/22, 6:16 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.1258&lon=-117.4570&data=depth&units=english&series=pds 1/4 NOAA Atlas 14, Volume 6, Version 2 Location name: Fontana, California, USA* Latitude: 34.1258°, Longitude: -117.457° Elevation: 1425.11 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, SandraPavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, GeoffreyBonnin, 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 0.127 (0.105‑0.154) 0.167 (0.139‑0.203) 0.221 (0.183‑0.269) 0.265 (0.218‑0.325) 0.325 (0.258‑0.413) 0.372 (0.289‑0.484) 0.421 (0.319‑0.560) 0.471 (0.347‑0.647) 0.542 (0.382‑0.776) 0.598 (0.407‑0.887) 10-min 0.182 (0.151‑0.220) 0.240 (0.199‑0.291) 0.316 (0.262‑0.385) 0.379 (0.312‑0.466) 0.466 (0.370‑0.592) 0.533 (0.415‑0.693) 0.603 (0.457‑0.803) 0.676 (0.498‑0.927) 0.777 (0.548‑1.11) 0.857 (0.584‑1.27) 15-min 0.220 (0.183‑0.266) 0.290 (0.241‑0.352) 0.383 (0.317‑0.466) 0.459 (0.377‑0.564) 0.563 (0.448‑0.716) 0.645 (0.501‑0.838) 0.729 (0.553‑0.971) 0.817 (0.602‑1.12) 0.939 (0.663‑1.35) 1.04 (0.706‑1.54) 30-min 0.329 (0.274‑0.399) 0.434 (0.361‑0.528) 0.573 (0.475‑0.698) 0.687 (0.565‑0.844) 0.844 (0.670‑1.07) 0.966 (0.751‑1.25) 1.09 (0.828‑1.46) 1.22 (0.901‑1.68) 1.41 (0.993‑2.01) 1.55 (1.06‑2.30) 60-min 0.496 (0.413‑0.602) 0.655 (0.545‑0.796) 0.864 (0.717‑1.05) 1.04 (0.852‑1.27) 1.27 (1.01‑1.62) 1.46 (1.13‑1.89) 1.65 (1.25‑2.19) 1.85 (1.36‑2.53) 2.12 (1.50‑3.04) 2.34 (1.60‑3.47) 2-hr 0.760 (0.633‑0.922) 0.993 (0.825‑1.21) 1.29 (1.07‑1.58) 1.54 (1.26‑1.89) 1.87 (1.48‑2.38) 2.12 (1.65‑2.76) 2.38 (1.80‑3.17) 2.64 (1.95‑3.62) 3.00 (2.12‑4.30) 3.29 (2.24‑4.87) 3-hr 0.977 (0.813‑1.19) 1.27 (1.06‑1.54) 1.65 (1.37‑2.01) 1.95 (1.60‑2.40) 2.36 (1.87‑3.00) 2.67 (2.07‑3.46) 2.98 (2.26‑3.97) 3.29 (2.42‑4.52) 3.72 (2.63‑5.33) 4.06 (2.76‑6.02) 6-hr 1.44 (1.20‑1.75) 1.87 (1.56‑2.27) 2.42 (2.00‑2.95) 2.85 (2.34‑3.50) 3.42 (2.72‑4.35) 3.85 (2.99‑5.00) 4.28 (3.24‑5.70) 4.71 (3.47‑6.46) 5.29 (3.73‑7.57) 5.73 (3.90‑8.49) 12-hr 1.96 (1.63‑2.38) 2.56 (2.13‑3.11) 3.30 (2.74‑4.02) 3.89 (3.20‑4.78) 4.65 (3.69‑5.91) 5.21 (4.05‑6.77) 5.77 (4.37‑7.68) 6.32 (4.65‑8.67) 7.05 (4.97‑10.1) 7.59 (5.17‑11.3) 24-hr 2.68 (2.37‑3.09) 3.53 (3.12‑4.07) 4.59 (4.05‑5.31) 5.42 (4.74‑6.32) 6.49 (5.50‑7.82) 7.28 (6.04‑8.96) 8.05 (6.52‑10.1) 8.82 (6.95‑11.4) 9.81 (7.42‑13.2) 10.6 (7.72‑14.7) 2-day 3.27 (2.90‑3.77) 4.41 (3.90‑5.09) 5.85 (5.16‑6.77) 7.00 (6.13‑8.16) 8.52 (7.22‑10.3) 9.66 (8.01‑11.9) 10.8 (8.74‑13.6) 11.9 (9.41‑15.5) 13.5 (10.2‑18.2) 14.6 (10.7‑20.4) 3-day 3.51 (3.11‑4.04) 4.81 (4.25‑5.54) 6.49 (5.72‑7.51) 7.85 (6.87‑9.16) 9.70 (8.22‑11.7) 11.1 (9.23‑13.7) 12.6 (10.2‑15.8) 14.0 (11.1‑18.2) 16.0 (12.1‑21.6) 17.6 (12.9‑24.6) 4-day 3.76 (3.33‑4.33) 5.21 (4.60‑6.01) 7.10 (6.26‑8.21) 8.65 (7.57‑10.1) 10.8 (9.13‑13.0) 12.4 (10.3‑15.3) 14.1 (11.4‑17.8) 15.9 (12.5‑20.6) 18.3 (13.8‑24.7) 20.2 (14.8‑28.2) 7-day 4.30(3.80‑4.95)6.02(5.32‑6.95)8.30(7.32‑9.60)10.2(8.91‑11.9)12.8(10.8‑15.4)14.8(12.3‑18.2)16.9(13.7‑21.3)19.1(15.1‑24.8)22.2(16.8‑29.9)24.6(18.0‑34.3) 10-day 4.65 (4.12‑5.36) 6.56 (5.80‑7.57) 9.11 (8.03‑10.5) 11.2 (9.82‑13.1) 14.2 (12.0‑17.1) 16.5 (13.7‑20.3) 18.9 (15.3‑23.8) 21.4 (16.9‑27.7) 24.9 (18.8‑33.6) 27.7 (20.3‑38.7) 20-day 5.52 (4.89‑6.36) 7.88 (6.96‑9.09) 11.1 (9.75‑12.8) 13.7 (12.0‑16.0) 17.5 (14.8‑21.1) 20.5 (17.0‑25.2) 23.7 (19.2‑29.8) 27.1 (21.3‑35.0) 31.8 (24.1‑42.9) 35.7 (26.1‑49.8) 30-day 6.46 (5.72‑7.44) 9.23 (8.16‑10.6) 13.0 (11.5‑15.0) 16.2 (14.2‑18.9) 20.8 (17.6‑25.0) 24.5 (20.3‑30.1) 28.4 (23.0‑35.7) 32.6 (25.7‑42.2) 38.6 (29.2‑52.0) 43.5 (31.8‑60.7) 45-day 7.71 (6.82‑8.88) 10.9 (9.66‑12.6) 15.4 (13.6‑17.8) 19.2 (16.8‑22.4) 24.6 (20.9‑29.7) 29.1 (24.1‑35.8) 33.9 (27.4‑42.7) 39.0 (30.8‑50.6) 46.5 (35.2‑62.8) 52.7 (38.6‑73.6) 60-day 8.99 (7.96‑10.4) 12.6 (11.1‑14.5) 17.6 (15.5‑20.4) 21.9 (19.2‑25.6) 28.2 (23.9‑34.0) 33.4 (27.7‑41.0) 38.9 (31.5‑49.0) 45.0 (35.5‑58.3) 53.8 (40.7‑72.6) 61.2 (44.8‑85.4) 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 8/11/22, 6:16 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.1258&lon=-117.4570&data=depth&units=english&series=pds 2/4 Back to Top Maps & aerials Small scale terrain 8/11/22, 6:16 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.1258&lon=-117.4570&data=depth&units=english&series=pds 3/4 Large scale terrain Large scale map Large scale aerial + – 3km 2mi + – 100km 60mi + – 100km 60mi 8/11/22, 6:16 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.1258&lon=-117.4570&data=depth&units=english&series=pds 4/4 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 Questions?: HDSC.Questions@noaa.gov Disclaimer + – 100km 60mi Technical Guidance Document for Water Quality Management Plans Prepared by: CDM Smith Inc. Prepared for and Submitted by: The County of San Bernardino Areawide Stormwater Program NPDES No. CAS618036, ORDER No. R8-2010-0036 Submitted To: California Water Quality Control Board – Santa Ana Region June 7, 2013 Approval Date: June 21, 2013 Effective Date: September 19, 2013 64 While conventional pavement results in increased rates and volumes of stormwater and non- stormwater runoff, properly constructed and maintained porous pavement BMPs allow stormwater to percolate through the pavement and enter the soil below. This facilitates groundwater recharge while providing the structural and functional features needed for the roadway, parking lot, or sidewalk. The paving surface, subgrade, and installation requirements of permeable pavements are more complex than those for conventional asphalt or concrete surfaces. For permeable pavement BMPs to function properly over an expected life span of 15 to 20 years, they must be properly sited, carefully designed and installed, and periodically maintained. Failure to protect paved areas from construction-related sediment loads can result in their premature clogging and failure. Retention volume provided by permeable pavement is a function of the infiltrating surface area into underlying soils and the depth of water that is either percolated over the course of the storm or stored within the BMP for percolation into soils following the storm (Table 5-4). Volume retention is estimated using the same equation as used for drywells and undergound infiltration. 5.4.2.6 Underground Infiltration Underground infiltration BMPs typically include a vault or chamber with an open bottom that is used to store runoff and infiltrate the runoff into the subsurface soils and aquifer. A number of vendors offer proprietary products that allow for similar or enhanced rates of infiltration and subsurface storage while offering durable prefabricated structures. There are many varieties of proprietary infiltration BMPs that can be used for roads and parking lots, parks and open spaces, single and multi-family residential, or mixed-use and commercial uses. Retention volume provided by underground infiltration is a function of the surface area infiltrating into underlying soils and the depth of water that is either percolated over the course of the storm or stored within the BMP for percolation into soils following the storm (Table 5-4). Volume retention is estimated using the same equation as used for drywells and permeable pavement. 5.4.3 Harvest and Use BMPs Harvest and use BMPs are BMPs that capture and store stormwater runoff for later on-site use. These BMPs are engineered to store a specified volume of water and have no design surface discharge until this volume is exceeded. The use of captured water used should comply with codes and regulations and should not result in runoff to storm drains or receiving waters (except indirectly via the sanitary sewer/municipal wastewater treatment system). Uses of captured water may potentially include irrigation demand, indoor non-potable demand, industrial process water demand, or other demands. This document provides guidance for irrigation use. Use of harvested stormwater for other non-potable demands shall be evaluated APPENDIX D  RATIONAL METHOD CALCULATION              EXISTING CONDITION              San Bernardino County Rational Hydrology Program     (Hydrology Manual Date ‐ August 1986)  CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2018 Version 9.0 Rational Hydrology Study        Date: 08/03/22 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 6427 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐  *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is   100.0 Computed rainfall intensity: Storm year =   100.00   1 hour rainfall =     1.650 (In.) Slope used for rainfall intensity curve b =  0.6000 Soil antecedent moisture condition (AMC) = 3 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      100.000 to Point/Station      110.000 **** INITIAL AREA EVALUATION **** ______________________________________________________________________ UNDEVELOPED (average cover) subarea         Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 50.00 Adjusted SCS curve number for AMC 3 = 70.00 Pervious ratio(Ap) = 1.0000     Max loss rate(Fm)=     0.532(In/Hr) Initial subarea data: Initial area flow distance =   837.100(Ft.) Top (of initial area) elevation =  1430.100(Ft.) Bottom (of initial area) elevation =  1413.470(Ft.) Difference in elevation =    16.630(Ft.) Slope =    0.01987  s(%)=       1.99 TC = k(0.706)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration =   22.819 min. Rainfall intensity =      2.947(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.737 Subarea runoff =     14.843(CFS) Total initial stream area =        6.830(Ac.) Pervious area fraction = 1.000 Initial area Fm value =    0.532(In/Hr) End of computations, Total Study Area =            6.83 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation. Area averaged pervious area fraction(Ap) = 1.000 Area averaged SCS curve number =  50.0             PROPOSED CONDITION               San Bernardino County Rational Hydrology Program     (Hydrology Manual Date ‐ August 1986)  CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2018 Version 9.0 Rational Hydrology Study        Date: 12/01/22 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 6427 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐  *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is   100.0 Computed rainfall intensity: Storm year =   100.00   1 hour rainfall =     1.650 (In.) Slope used for rainfall intensity curve b =  0.6000 Soil antecedent moisture condition (AMC) = 2 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      100.000 to Point/Station      110.000 **** INITIAL AREA EVALUATION **** ______________________________________________________________________ CONDOMINIUM subarea type Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Initial subarea data: Initial area flow distance =   107.000(Ft.) Top (of initial area) elevation =  1429.700(Ft.) Bottom (of initial area) elevation =  1427.400(Ft.) Difference in elevation =     2.300(Ft.) Slope =    0.02150  s(%)= 2.15 TC = k(0.360)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration =    5.030 min. Rainfall intensity =      7.302(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.858 Subarea runoff =      1.253(CFS) Total initial stream area =        0.200(Ac.) Pervious area fraction = 0.350 Initial area Fm value =    0.342(In/Hr) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      110.000 to Point/Station      120.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation =  1427.400(Ft.) End of street segment elevation =  1425.700(Ft.) Length of street segment  =   379.000(Ft.) Height of curb above gutter flowline  =    6.0(In.) Width of half street (curb to crown)  =  20.000(Ft.) Distance from crown to crossfall grade break  =  18.000(Ft.) Slope from gutter to grade break (v/hz) =   0.080 Slope from grade break to crown (v/hz)  =   0.020 Street flow is on [2] side(s) of the street  Distance from curb to property line  =  10.000(Ft.) Slope from curb to property line (v/hz) =   0.020 Gutter width =   2.000(Ft.) Gutter hike from flowline =  2.000(In.)  Manning's N in gutter =  0.0150  Manning's N from gutter to grade break =  0.0150  Manning's N from grade break to crown =  0.0150 Estimated mean flow rate at midpoint of street =      4.166(CFS) Depth of flow =   0.345(Ft.), Average velocity =   1.585(Ft/s) Streetflow hydraulics at midpoint of street travel: Halfstreet flow width =  10.896(Ft.) Flow velocity =   1.59(Ft/s) Travel time =    3.98 min.     TC =    9.01  min.  Adding area flow to street CONDOMINIUM subarea type Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Rainfall intensity =      5.145(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area,(total area with modified rational method)(Q=KCIA) is C = 0.840 Subarea runoff =      5.707(CFS) for    1.410(Ac.) Total runoff =      6.960(CFS) Effective area this stream =        1.61(Ac.) Total Study Area (Main Stream No. 1) =        1.61(Ac.) Area averaged Fm value =    0.342(In/Hr) Street flow at end of street =      6.960(CFS) Half street flow at end of street =      3.480(CFS) Depth of flow =   0.396(Ft.), Average velocity =   1.789(Ft/s) Flow width (from curb towards crown)=  13.484(Ft.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      120.000 to Point/Station      130.000 **** PIPEFLOW TRAVEL TIME (User specified size) **** ______________________________________________________________________ Upstream point/station elevation =  1425.700(Ft.) Downstream point/station elevation =  1416.000(Ft.) Pipe length  =   534.00(Ft.)   Manning's N = 0.013 No. of pipes = 1  Required pipe flow  =     6.960(CFS) Given pipe size =     24.00(In.) Calculated individual pipe flow  =     6.960(CFS) Normal flow depth in pipe =    7.79(In.) Flow top width inside pipe =   22.48(In.) Critical Depth =   11.23(In.) Pipe flow velocity =      7.86(Ft/s) Travel time through pipe =    1.13 min. Time of concentration (TC) =    10.15 min. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      140.000 to Point/Station      130.000 **** SUBAREA FLOW ADDITION **** ______________________________________________________________________ CONDOMINIUM subarea type                     Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Time of concentration =    10.15 min. Rainfall intensity =      4.793(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area,(total area with modified rational method)(Q=KCIA) is C = 0.836 Subarea runoff =      6.779(CFS) for    1.820(Ac.) Total runoff =     13.739(CFS) Effective area this stream =        3.43(Ac.) Total Study Area (Main Stream No. 1) =        3.43(Ac.) Area averaged Fm value =    0.342(In/Hr) End of computations, Total Study Area =            3.43 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation. Area averaged pervious area fraction(Ap) = 0.350 Area averaged SCS curve number =  32.0 San Bernardino County Rational Hydrology Program     (Hydrology Manual Date ‐ August 1986)  CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2018 Version 9.0 Rational Hydrology Study        Date: 12/01/22 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 6427 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐  *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is   100.0 Computed rainfall intensity: Storm year =   100.00   1 hour rainfall =     1.650 (In.) Slope used for rainfall intensity curve b =  0.6000 Soil antecedent moisture condition (AMC) = 2 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      200.000 to Point/Station      210.000 **** INITIAL AREA EVALUATION **** ______________________________________________________________________ CONDOMINIUM subarea type                     Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Initial subarea data: Initial area flow distance =   120.200(Ft.) Top (of initial area) elevation =  1427.800(Ft.) Bottom (of initial area) elevation =  1426.500(Ft.) Difference in elevation =     1.300(Ft.) Slope =    0.01082  s(%)=       1.08 TC = k(0.360)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration =    6.046 min. Rainfall intensity =      6.539(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.853 Subarea runoff =      1.115(CFS) Total initial stream area =        0.200(Ac.) Pervious area fraction = 0.350 Initial area Fm value =    0.342(In/Hr) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      210.000 to Point/Station      220.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation =  1426.500(Ft.) End of street segment elevation =  1418.800(Ft.) Length of street segment  =   333.000(Ft.) Height of curb above gutter flowline  =    6.0(In.) Width of half street (curb to crown)  =  20.000(Ft.) Distance from crown to crossfall grade break  =  18.000(Ft.) Slope from gutter to grade break (v/hz) =   0.080 Slope from grade break to crown (v/hz)  =   0.020 Street flow is on [2] side(s) of the street  Distance from curb to property line  =  10.000(Ft.) Slope from curb to property line (v/hz) =   0.020 Gutter width =   2.000(Ft.) Gutter hike from flowline =  2.000(In.)  Manning's N in gutter =  0.0150  Manning's N from gutter to grade break =  0.0150  Manning's N from grade break to crown =  0.0150 Estimated mean flow rate at midpoint of street =      4.841(CFS) Depth of flow =   0.289(Ft.), Average velocity =   3.096(Ft/s) Streetflow hydraulics at midpoint of street travel: Halfstreet flow width =   8.094(Ft.) Flow velocity =   3.10(Ft/s) Travel time =    1.79 min.     TC =    7.84  min.  Adding area flow to street CONDOMINIUM subarea type                     Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Rainfall intensity =      5.595(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area,(total area with modified rational method)(Q=KCIA) is C = 0.845 Subarea runoff =      7.348(CFS) for    1.590(Ac.) Total runoff =      8.463(CFS) Effective area this stream =        1.79(Ac.) Total Study Area (Main Stream No. 1) =        1.79(Ac.) Area averaged Fm value =    0.342(In/Hr) Street flow at end of street =      8.463(CFS) Half street flow at end of street =      4.231(CFS) Depth of flow =   0.334(Ft.), Average velocity =   3.508(Ft/s) Flow width (from curb towards crown)=  10.390(Ft.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      220.000 to Point/Station      130.000 **** PIPEFLOW TRAVEL TIME (User specified size) **** ______________________________________________________________________ Upstream point/station elevation =  1418.800(Ft.) Downstream point/station elevation =  1416.000(Ft.) Pipe length  =   309.00(Ft.)   Manning's N = 0.013 No. of pipes = 1  Required pipe flow  =     8.463(CFS) Given pipe size =     24.00(In.) Calculated individual pipe flow  =     8.463(CFS) Normal flow depth in pipe =   10.45(In.) Flow top width inside pipe =   23.80(In.) Critical Depth =   12.43(In.) Pipe flow velocity =      6.44(Ft/s) Travel time through pipe =    0.80 min. Time of concentration (TC) =     8.64 min. End of computations, Total Study Area =            1.79 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation. Area averaged pervious area fraction(Ap) = 0.350 Area averaged SCS curve number =  32.0 San Bernardino County Rational Hydrology Program     (Hydrology Manual Date ‐ August 1986)  CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2018 Version 9.0 Rational Hydrology Study        Date: 12/01/22 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 6427 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐  *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is   100.0 Computed rainfall intensity: Storm year =   100.00   1 hour rainfall =     1.650 (In.) Slope used for rainfall intensity curve b =  0.6000 Soil antecedent moisture condition (AMC) = 2 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      300.000 to Point/Station      310.000 **** INITIAL AREA EVALUATION **** ______________________________________________________________________ CONDOMINIUM subarea type                     Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Initial subarea data: Initial area flow distance =    67.200(Ft.) Top (of initial area) elevation =  1420.100(Ft.) Bottom (of initial area) elevation =  1419.500(Ft.) Difference in elevation =     0.600(Ft.) Slope =    0.00893  s(%)=       0.89 TC = k(0.360)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration =    4.978 min. Rainfall intensity =      7.347(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.858 Subarea runoff =      1.261(CFS) Total initial stream area =        0.200(Ac.) Pervious area fraction = 0.350 Initial area Fm value =    0.342(In/Hr) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      310.000 to Point/Station      340.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation =  1419.500(Ft.) End of street segment elevation =  1417.000(Ft.) Length of street segment  =   299.000(Ft.) Height of curb above gutter flowline  =    6.0(In.) Width of half street (curb to crown)  =  20.000(Ft.) Distance from crown to crossfall grade break  =  18.000(Ft.) Slope from gutter to grade break (v/hz) =   0.080 Slope from grade break to crown (v/hz)  =   0.020 Street flow is on [2] side(s) of the street  Distance from curb to property line  =  10.000(Ft.) Slope from curb to property line (v/hz) =   0.020 Gutter width =   2.000(Ft.) Gutter hike from flowline =  2.000(In.)  Manning's N in gutter =  0.0150  Manning's N from gutter to grade break =  0.0150  Manning's N from grade break to crown =  0.0150 Estimated mean flow rate at midpoint of street =      4.687(CFS) Depth of flow =   0.327(Ft.), Average velocity =   2.070(Ft/s) Streetflow hydraulics at midpoint of street travel: Halfstreet flow width =  10.027(Ft.) Flow velocity =   2.07(Ft/s) Travel time =    2.41 min.     TC =    7.39  min.  Adding area flow to street CONDOMINIUM subarea type                     Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Rainfall intensity =      5.799(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area,(total area with modified rational method)(Q=KCIA) is C = 0.847 Subarea runoff =      6.695(CFS) for    1.420(Ac.) Total runoff =      7.956(CFS) Effective area this stream =        1.62(Ac.) Total Study Area (Main Stream No. 1) =        1.62(Ac.) Area averaged Fm value =    0.342(In/Hr) Street flow at end of street =      7.956(CFS) Half street flow at end of street =      3.978(CFS) Depth of flow =   0.377(Ft.), Average velocity =   2.342(Ft/s) Flow width (from curb towards crown)=  12.538(Ft.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      340.000 to Point/Station      130.000 **** PIPEFLOW TRAVEL TIME (User specified size) **** ______________________________________________________________________ Upstream point/station elevation =   417.000(Ft.) Downstream point/station elevation =   416.000(Ft.) Pipe length  =    90.00(Ft.)   Manning's N = 0.013 No. of pipes = 1  Required pipe flow  =     7.956(CFS) Given pipe size =     24.00(In.) Calculated individual pipe flow  =     7.956(CFS) Normal flow depth in pipe =    9.55(In.) Flow top width inside pipe =   23.49(In.) Critical Depth =   12.06(In.) Pipe flow velocity =      6.83(Ft/s) Travel time through pipe =    0.22 min. Time of concentration (TC) =     7.61 min. End of computations, Total Study Area =            1.62 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation. Area averaged pervious area fraction(Ap) = 0.350 Area averaged SCS curve number =  32.0 San Bernardino County Rational Hydrology Program     (Hydrology Manual Date ‐ August 1986)  CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2018 Version 9.0 Rational Hydrology Study        Date: 12/01/22 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 6427 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐  *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is   100.0 Computed rainfall intensity: Storm year =   100.00   1 hour rainfall =     1.650 (In.) Slope used for rainfall intensity curve b =  0.6000 Soil antecedent moisture condition (AMC) = 2 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      100.000 to Point/Station      130.000 **** USER DEFINED FLOW INFORMATION AT A POINT **** ______________________________________________________________________ CONDOMINIUM subarea type                     Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Rainfall intensity =      4.792(In/Hr) for a   100.0 year storm User specified values are as follows: TC =  10.15 min.  Rain intensity =       4.79(In/Hr) Total area this stream =         3.43(Ac.) Total Study Area (Main Stream No. 1) =        3.43(Ac.) Total runoff =     13.74(CFS) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      100.000 to Point/Station      130.000 **** CONFLUENCE OF MINOR STREAMS **** ______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1 Stream flow area =      3.430(Ac.) Runoff from this stream =     13.740(CFS) Time of concentration =   10.15 min. Rainfall intensity =     4.792(In/Hr) Area averaged loss rate (Fm) =    0.3422(In/Hr) Area averaged Pervious ratio (Ap) = 0.3500 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      200.000 to Point/Station      130.000 **** USER DEFINED FLOW INFORMATION AT A POINT **** ______________________________________________________________________ CONDOMINIUM subarea type                     Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Rainfall intensity =      5.278(In/Hr) for a   100.0 year storm User specified values are as follows: TC =   8.64 min.  Rain intensity =       5.28(In/Hr) Total area this stream =         1.79(Ac.) Total Study Area (Main Stream No. 1) =        5.22(Ac.) Total runoff =      8.46(CFS) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      200.000 to Point/Station      130.000 **** CONFLUENCE OF MINOR STREAMS **** ______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2 Stream flow area =      1.790(Ac.) Runoff from this stream =      8.460(CFS) Time of concentration =    8.64 min. Rainfall intensity =     5.278(In/Hr) Area averaged loss rate (Fm) =    0.3422(In/Hr) Area averaged Pervious ratio (Ap) = 0.3500 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      300.000 to Point/Station      130.000 **** USER DEFINED FLOW INFORMATION AT A POINT **** ______________________________________________________________________ CONDOMINIUM subarea type                     Decimal fraction soil group A = 1.000 Decimal fraction soil group B = 0.000 Decimal fraction soil group C = 0.000 Decimal fraction soil group D = 0.000 SCS curve number for soil(AMC 2)  = 32.00 Pervious ratio(Ap) = 0.3500     Max loss rate(Fm)=     0.342(In/Hr) Rainfall intensity =      5.696(In/Hr) for a   100.0 year storm User specified values are as follows: TC =   7.61 min.  Rain intensity =       5.70(In/Hr) Total area this stream =         1.62(Ac.) Total Study Area (Main Stream No. 1) =        6.84(Ac.) Total runoff =      7.96(CFS) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      300.000 to Point/Station      130.000 **** CONFLUENCE OF MINOR STREAMS **** ______________________________________________________________________ Along Main Stream number: 1 in normal stream number 3 Stream flow area =      1.620(Ac.) Runoff from this stream =      7.960(CFS) Time of concentration =    7.61 min. Rainfall intensity =     5.696(In/Hr) Area averaged loss rate (Fm) =    0.3422(In/Hr) Area averaged Pervious ratio (Ap) = 0.3500 Summary of stream data: Stream Flow rate    Area    TC     Fm       Rainfall Intensity  No.    (CFS)   (Ac.)       (min) (In/Hr)     (In/Hr) 1     13.74     3.430     10.15    0.342      4.792 2      8.46     1.790      8.64    0.342      5.278 3      7.96     1.620      7.61    0.342      5.696 Qmax(1) =    1.000 *    1.000 *    13.740) +    0.901 *    1.000 *     8.460) +    0.831 *    1.000 *     7.960) + =      27.983 Qmax(2) =    1.109 *    0.851 *    13.740) +    1.000 *    1.000 *     8.460) +    0.922 *    1.000 *     7.960) + =      28.773 Qmax(3) =    1.203 *    0.750 *    13.740) +    1.085 *    0.881 *     8.460) +    1.000 *    1.000 *     7.960) + =      28.436 Total of 3 streams to confluence: Flow rates before confluence point:       13.740       8.460       7.960 Maximum flow rates at confluence using above data:        27.983       28.773       28.436 Area of streams before confluence:         3.430        1.790        1.620 Effective area values after confluence:         6.840        6.330        5.768 Results of confluence: Total flow rate =     28.773(CFS) Time of concentration =     8.640 min. Effective stream area after confluence =      6.330(Ac.) Study area average Pervious fraction(Ap) =  0.350 Study area average soil loss rate(Fm) =    0.342(In/Hr) Study area total (this main stream) =       6.84(Ac.) End of computations, Total Study Area =            6.84 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation. Area averaged pervious area fraction(Ap) = 0.350 Area averaged SCS curve number =  32.0 APPENDIX E  UNIT HYDROGRAPH CALCULATION              EXISTING CONDITION               U n i t   H y d r o g r a p h    A n a l y s i s Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2018, Version 9.0 Study date  08/08/22 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method Manual date ‐ August 1986 Program License Serial Number 6427 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Storm Event Year = 100 Antecedent Moisture Condition = 3  English (in‐lb) Input Units Used  English Rainfall Data (Inches) Input Values Used  English Units used in output format Area averaged rainfall intensity isohyetal data: Sub‐Area        Duration        Isohyetal (Ac.)            (hours)         (In) Rainfall data for year 100      6.84            1           1.65 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 100      6.84            6           4.28 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 100      6.84           24           8.05 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ******** SCS curve  SCS curve     Area     Area     Fp(Fig C6)    Ap      Fm No.(AMCII) NO.(AMC 3)    (Ac.)    Fraction     (In/Hr)  (dec.)   (In/Hr)  50.0      70.0          6.84      1.000     0.532    1.000    0.532 Area‐averaged adjusted loss rate Fm (In/Hr) =  0.532 ********* Area‐Averaged low loss rate fraction, Yb ********** Area       Area          SCS CN    SCS CN      S     Pervious  (Ac.)      Fract         (AMC2)    (AMC3)           Yield Fr      6.84   1.000         50.0      70.0       4.29     0.560 Area‐averaged catchment yield fraction, Y =  0.560 Area‐averaged low loss fraction, Yb =  0.440 User entry of time of concentration  =   0.380 (hours) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area =       6.84(Ac.) Catchment Lag time =   0.304 hours Unit interval =   5.000 minutes Unit interval percentage of lag time = 27.4123 Hydrograph baseflow =     0.00(CFS) Average maximum watershed loss rate(Fm) =  0.532(In/Hr) Average low loss rate fraction (Yb) = 0.440 (decimal) VALLEY UNDEVELOPED S‐Graph Selected Computed peak 5‐minute rainfall =  0.611(In) Computed peak 30‐minute rainfall =  1.250(In) Specified peak 1‐hour rainfall =  1.650(In) Computed peak 3‐hour rainfall =  2.960(In) Specified peak 6‐hour rainfall =  4.280(In) Specified peak 24‐hour rainfall =  8.050(In) Rainfall depth area reduction factors: Using a total area of       6.84(Ac.) (Ref: fig. E‐4) 5‐minute factor = 1.000     Adjusted rainfall =  0.610(In) 30‐minute factor = 1.000    Adjusted rainfall =  1.250(In) 1‐hour factor = 1.000       Adjusted rainfall =  1.649(In) 3‐hour factor = 1.000       Adjusted rainfall =  2.960(In) 6‐hour factor = 1.000       Adjusted rainfall =  4.280(In) 24‐hour factor = 1.000      Adjusted rainfall =  8.050(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ U n i t  H y d r o g r a p h  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph Number            Mean values             ((CFS)) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ (K =        82.72 (CFS))   1                2.576                   2.131   2               11.593                   7.459   3               27.617                  13.255   4               46.751                  15.828   5               61.026                  11.809   6               69.457                   6.975   7               74.726                   4.358   8               78.637                   3.236   9               81.789                   2.607  10               84.414                   2.172  11               86.623                   1.827  12               88.414                   1.482  13               90.047                   1.351  14               91.383                   1.105  15               92.562                   0.975  16               93.496                   0.773  17               94.364                   0.718  18               95.191                   0.684  19               95.950                   0.628  20               96.560                   0.504  21               97.115                   0.459  22               97.608                   0.408  23               98.035                   0.353  24               98.414                   0.314  25               98.716                   0.250  26               98.990                   0.227  27               99.264                   0.227  28               99.538                   0.227  29               99.813                   0.227  30              100.000                   0.155 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Peak Unit   Adjusted mass rainfall  Unit rainfall Number              (In)                (In)   1              0.6105               0.6105   2              0.8055               0.1951   3              0.9474               0.1418   4              1.0629               0.1155   5              1.1621               0.0992   6              1.2501               0.0879   7              1.3296               0.0795   8              1.4025               0.0729   9              1.4702               0.0677  10              1.5335               0.0633  11              1.5930               0.0596  12              1.6495               0.0564  13              1.7213               0.0718  14              1.7905               0.0692  15              1.8575               0.0670  16              1.9224               0.0649  17              1.9854               0.0630  18              2.0468               0.0613  19              2.1065               0.0598  20              2.1648               0.0583  21              2.2218               0.0570  22              2.2775               0.0557  23              2.3320               0.0545  24              2.3854               0.0534  25              2.4378               0.0524  26              2.4892               0.0514  27              2.5397               0.0505  28              2.5894               0.0496  29              2.6382               0.0488  30              2.6862               0.0480  31              2.7335               0.0473  32              2.7801               0.0466  33              2.8260               0.0459  34              2.8713               0.0453  35              2.9159               0.0446  36              2.9600               0.0440  37              3.0034               0.0435  38              3.0463               0.0429  39              3.0887               0.0424  40              3.1306               0.0419  41              3.1720               0.0414  42              3.2129               0.0409  43              3.2534               0.0405  44              3.2934               0.0400  45              3.3330               0.0396  46              3.3722               0.0392  47              3.4111               0.0388  48              3.4495               0.0384  49              3.4875               0.0380  50              3.5252               0.0377  51              3.5625               0.0373  52              3.5995               0.0370  53              3.6362               0.0367  54              3.6725               0.0363  55              3.7086               0.0360  56              3.7443               0.0357  57              3.7797               0.0354  58              3.8148               0.0351  59              3.8497               0.0349  60              3.8843               0.0346  61              3.9186               0.0343  62              3.9526               0.0340  63              3.9864               0.0338  64              4.0200               0.0335  65              4.0532               0.0333  66              4.0863               0.0331  67              4.1191               0.0328  68              4.1517               0.0326  69              4.1841               0.0324  70              4.2162               0.0322  71              4.2482               0.0319  72              4.2799               0.0317  73              4.3069               0.0270  74              4.3337               0.0268  75              4.3603               0.0266  76              4.3867               0.0264  77              4.4129               0.0262  78              4.4389               0.0260  79              4.4647               0.0258  80              4.4904               0.0257  81              4.5159               0.0255  82              4.5412               0.0253  83              4.5664               0.0252  84              4.5914               0.0250  85              4.6162               0.0248  86              4.6409               0.0247  87              4.6654               0.0245  88              4.6897               0.0244  89              4.7139               0.0242  90              4.7380               0.0241  91              4.7619               0.0239  92              4.7857               0.0238  93              4.8093               0.0236  94              4.8328               0.0235  95              4.8562               0.0234  96              4.8794               0.0232  97              4.9025               0.0231  98              4.9255               0.0230  99              4.9483               0.0228 100              4.9710               0.0227 101              4.9936               0.0226 102              5.0161               0.0225 103              5.0385               0.0224 104              5.0607               0.0222 105              5.0828               0.0221 106              5.1048               0.0220 107              5.1267               0.0219 108              5.1485               0.0218 109              5.1701               0.0217 110              5.1917               0.0216 111              5.2132               0.0215 112              5.2345               0.0213 113              5.2558               0.0212 114              5.2769               0.0211 115              5.2979               0.0210 116              5.3189               0.0209 117              5.3397               0.0208 118              5.3605               0.0207 119              5.3811               0.0207 120              5.4017               0.0206 121              5.4222               0.0205 122              5.4425               0.0204 123              5.4628               0.0203 124              5.4830               0.0202 125              5.5031               0.0201 126              5.5231               0.0200 127              5.5431               0.0199 128              5.5629               0.0198 129              5.5827               0.0198 130              5.6024               0.0197 131              5.6220               0.0196 132              5.6415               0.0195 133              5.6609               0.0194 134              5.6803               0.0194 135              5.6996               0.0193 136              5.7188               0.0192 137              5.7379               0.0191 138              5.7569               0.0190 139              5.7759               0.0190 140              5.7948               0.0189 141              5.8136               0.0188 142              5.8324               0.0188 143              5.8511               0.0187 144              5.8697               0.0186 145              5.8882               0.0185 146              5.9067               0.0185 147              5.9251               0.0184 148              5.9434               0.0183 149              5.9617               0.0183 150              5.9799               0.0182 151              5.9980               0.0181 152              6.0161               0.0181 153              6.0341               0.0180 154              6.0520               0.0179 155              6.0699               0.0179 156              6.0877               0.0178 157              6.1055               0.0178 158              6.1232               0.0177 159              6.1408               0.0176 160              6.1584               0.0176 161              6.1759               0.0175 162              6.1933               0.0175 163              6.2107               0.0174 164              6.2280               0.0173 165              6.2453               0.0173 166              6.2625               0.0172 167              6.2797               0.0172 168              6.2968               0.0171 169              6.3139               0.0171 170              6.3309               0.0170 171              6.3478               0.0169 172              6.3647               0.0169 173              6.3815               0.0168 174              6.3983               0.0168 175              6.4150               0.0167 176              6.4317               0.0167 177              6.4484               0.0166 178              6.4649               0.0166 179              6.4815               0.0165 180              6.4979               0.0165 181              6.5144               0.0164 182              6.5307               0.0164 183              6.5471               0.0163 184              6.5633               0.0163 185              6.5796               0.0162 186              6.5958               0.0162 187              6.6119               0.0161 188              6.6280               0.0161 189              6.6440               0.0160 190              6.6600               0.0160 191              6.6760               0.0160 192              6.6919               0.0159 193              6.7077               0.0159 194              6.7235               0.0158 195              6.7393               0.0158 196              6.7550               0.0157 197              6.7707               0.0157 198              6.7864               0.0156 199              6.8020               0.0156 200              6.8175               0.0156 201              6.8330               0.0155 202              6.8485               0.0155 203              6.8639               0.0154 204              6.8793               0.0154 205              6.8947               0.0153 206              6.9100               0.0153 207              6.9252               0.0153 208              6.9405               0.0152 209              6.9557               0.0152 210              6.9708               0.0151 211              6.9859               0.0151 212              7.0010               0.0151 213              7.0160               0.0150 214              7.0310               0.0150 215              7.0459               0.0150 216              7.0609               0.0149 217              7.0757               0.0149 218              7.0906               0.0148 219              7.1054               0.0148 220              7.1202               0.0148 221              7.1349               0.0147 222              7.1496               0.0147 223              7.1642               0.0147 224              7.1789               0.0146 225              7.1934               0.0146 226              7.2080               0.0146 227              7.2225               0.0145 228              7.2370               0.0145 229              7.2514               0.0144 230              7.2659               0.0144 231              7.2802               0.0144 232              7.2946               0.0143 233              7.3089               0.0143 234              7.3232               0.0143 235              7.3374               0.0142 236              7.3516               0.0142 237              7.3658               0.0142 238              7.3799               0.0141 239              7.3941               0.0141 240              7.4081               0.0141 241              7.4222               0.0141 242              7.4362               0.0140 243              7.4502               0.0140 244              7.4642               0.0140 245              7.4781               0.0139 246              7.4920               0.0139 247              7.5058               0.0139 248              7.5197               0.0138 249              7.5335               0.0138 250              7.5472               0.0138 251              7.5610               0.0137 252              7.5747               0.0137 253              7.5884               0.0137 254              7.6020               0.0137 255              7.6157               0.0136 256              7.6293               0.0136 257              7.6428               0.0136 258              7.6564               0.0135 259              7.6699               0.0135 260              7.6833               0.0135 261              7.6968               0.0135 262              7.7102               0.0134 263              7.7236               0.0134 264              7.7370               0.0134 265              7.7503               0.0133 266              7.7636               0.0133 267              7.7769               0.0133 268              7.7902               0.0133 269              7.8034               0.0132 270              7.8166               0.0132 271              7.8298               0.0132 272              7.8430               0.0132 273              7.8561               0.0131 274              7.8692               0.0131 275              7.8823               0.0131 276              7.8953               0.0130 277              7.9083               0.0130 278              7.9213               0.0130 279              7.9343               0.0130 280              7.9473               0.0129 281              7.9602               0.0129 282              7.9731               0.0129 283              7.9859               0.0129 284              7.9988               0.0128 285              8.0116               0.0128 286              8.0244               0.0128 287              8.0372               0.0128 288              8.0499               0.0127 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Unit              Unit            Unit              Effective Period            Rainfall        Soil‐Loss         Rainfall (number)            (In)          (In)                 (In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐   1              0.0127           0.0056              0.0071   2              0.0128           0.0056              0.0072   3              0.0128           0.0056              0.0072   4              0.0128           0.0057              0.0072   5              0.0129           0.0057              0.0072   6              0.0129           0.0057              0.0072   7              0.0130           0.0057              0.0073   8              0.0130           0.0057              0.0073   9              0.0130           0.0057              0.0073  10              0.0131           0.0058              0.0073  11              0.0131           0.0058              0.0073  12              0.0132           0.0058              0.0074  13              0.0132           0.0058              0.0074  14              0.0132           0.0058              0.0074  15              0.0133           0.0058              0.0074  16              0.0133           0.0059              0.0075  17              0.0134           0.0059              0.0075  18              0.0134           0.0059              0.0075  19              0.0135           0.0059              0.0075  20              0.0135           0.0059              0.0075  21              0.0135           0.0060              0.0076  22              0.0136           0.0060              0.0076  23              0.0136           0.0060              0.0076  24              0.0137           0.0060              0.0076  25              0.0137           0.0060              0.0077  26              0.0137           0.0060              0.0077  27              0.0138           0.0061              0.0077  28              0.0138           0.0061              0.0077  29              0.0139           0.0061              0.0078  30              0.0139           0.0061              0.0078  31              0.0140           0.0062              0.0078  32              0.0140           0.0062              0.0078  33              0.0141           0.0062              0.0079  34              0.0141           0.0062              0.0079  35              0.0142           0.0062              0.0079  36              0.0142           0.0063              0.0080  37              0.0143           0.0063              0.0080  38              0.0143           0.0063              0.0080  39              0.0144           0.0063              0.0081  40              0.0144           0.0063              0.0081  41              0.0145           0.0064              0.0081  42              0.0145           0.0064              0.0081  43              0.0146           0.0064              0.0082  44              0.0146           0.0064              0.0082  45              0.0147           0.0065              0.0082  46              0.0147           0.0065              0.0082  47              0.0148           0.0065              0.0083  48              0.0148           0.0065              0.0083  49              0.0149           0.0066              0.0084  50              0.0150           0.0066              0.0084  51              0.0150           0.0066              0.0084  52              0.0151           0.0066              0.0084  53              0.0151           0.0067              0.0085  54              0.0152           0.0067              0.0085  55              0.0153           0.0067              0.0085  56              0.0153           0.0067              0.0086  57              0.0154           0.0068              0.0086  58              0.0154           0.0068              0.0086  59              0.0155           0.0068              0.0087  60              0.0156           0.0068              0.0087  61              0.0156           0.0069              0.0088  62              0.0157           0.0069              0.0088  63              0.0158           0.0069              0.0088  64              0.0158           0.0070              0.0089  65              0.0159           0.0070              0.0089  66              0.0160           0.0070              0.0089  67              0.0160           0.0071              0.0090  68              0.0161           0.0071              0.0090  69              0.0162           0.0071              0.0091  70              0.0162           0.0071              0.0091  71              0.0163           0.0072              0.0091  72              0.0164           0.0072              0.0092  73              0.0165           0.0073              0.0092  74              0.0165           0.0073              0.0093  75              0.0166           0.0073              0.0093  76              0.0167           0.0073              0.0093  77              0.0168           0.0074              0.0094  78              0.0168           0.0074              0.0094  79              0.0169           0.0075              0.0095  80              0.0170           0.0075              0.0095  81              0.0171           0.0075              0.0096  82              0.0172           0.0076              0.0096  83              0.0173           0.0076              0.0097  84              0.0173           0.0076              0.0097  85              0.0175           0.0077              0.0098  86              0.0175           0.0077              0.0098  87              0.0176           0.0078              0.0099  88              0.0177           0.0078              0.0099  89              0.0178           0.0078              0.0100  90              0.0179           0.0079              0.0100  91              0.0180           0.0079              0.0101  92              0.0181           0.0080              0.0101  93              0.0182           0.0080              0.0102  94              0.0183           0.0080              0.0102  95              0.0184           0.0081              0.0103  96              0.0185           0.0081              0.0103  97              0.0186           0.0082              0.0104  98              0.0187           0.0082              0.0105  99              0.0188           0.0083              0.0105 100              0.0189           0.0083              0.0106 101              0.0190           0.0084              0.0107 102              0.0191           0.0084              0.0107 103              0.0193           0.0085              0.0108 104              0.0194           0.0085              0.0108 105              0.0195           0.0086              0.0109 106              0.0196           0.0086              0.0110 107              0.0198           0.0087              0.0111 108              0.0198           0.0087              0.0111 109              0.0200           0.0088              0.0112 110              0.0201           0.0088              0.0113 111              0.0203           0.0089              0.0114 112              0.0204           0.0090              0.0114 113              0.0206           0.0090              0.0115 114              0.0207           0.0091              0.0116 115              0.0208           0.0092              0.0117 116              0.0209           0.0092              0.0117 117              0.0211           0.0093              0.0118 118              0.0212           0.0094              0.0119 119              0.0215           0.0094              0.0120 120              0.0216           0.0095              0.0121 121              0.0218           0.0096              0.0122 122              0.0219           0.0096              0.0123 123              0.0221           0.0097              0.0124 124              0.0222           0.0098              0.0124 125              0.0225           0.0099              0.0126 126              0.0226           0.0099              0.0126 127              0.0228           0.0101              0.0128 128              0.0230           0.0101              0.0129 129              0.0232           0.0102              0.0130 130              0.0234           0.0103              0.0131 131              0.0236           0.0104              0.0132 132              0.0238           0.0105              0.0133 133              0.0241           0.0106              0.0135 134              0.0242           0.0107              0.0136 135              0.0245           0.0108              0.0137 136              0.0247           0.0109              0.0138 137              0.0250           0.0110              0.0140 138              0.0252           0.0111              0.0141 139              0.0255           0.0112              0.0143 140              0.0257           0.0113              0.0144 141              0.0260           0.0115              0.0146 142              0.0262           0.0115              0.0147 143              0.0266           0.0117              0.0149 144              0.0268           0.0118              0.0150 145              0.0317           0.0140              0.0178 146              0.0319           0.0141              0.0179 147              0.0324           0.0142              0.0181 148              0.0326           0.0143              0.0182 149              0.0331           0.0145              0.0185 150              0.0333           0.0147              0.0186 151              0.0338           0.0149              0.0189 152              0.0340           0.0150              0.0191 153              0.0346           0.0152              0.0194 154              0.0349           0.0153              0.0195 155              0.0354           0.0156              0.0198 156              0.0357           0.0157              0.0200 157              0.0363           0.0160              0.0203 158              0.0367           0.0161              0.0205 159              0.0373           0.0164              0.0209 160              0.0377           0.0166              0.0211 161              0.0384           0.0169              0.0215 162              0.0388           0.0171              0.0217 163              0.0396           0.0174              0.0222 164              0.0400           0.0176              0.0224 165              0.0409           0.0180              0.0229 166              0.0414           0.0182              0.0232 167              0.0424           0.0187              0.0237 168              0.0429           0.0189              0.0240 169              0.0440           0.0194              0.0247 170              0.0446           0.0196              0.0250 171              0.0459           0.0202              0.0257 172              0.0466           0.0205              0.0261 173              0.0480           0.0211              0.0269 174              0.0488           0.0215              0.0273 175              0.0505           0.0222              0.0283 176              0.0514           0.0226              0.0288 177              0.0534           0.0235              0.0299 178              0.0545           0.0240              0.0305 179              0.0570           0.0251              0.0319 180              0.0583           0.0257              0.0326 181              0.0613           0.0270              0.0343 182              0.0630           0.0277              0.0353 183              0.0670           0.0295              0.0375 184              0.0692           0.0305              0.0388 185              0.0564           0.0248              0.0316 186              0.0596           0.0262              0.0334 187              0.0677           0.0298              0.0379 188              0.0729           0.0321              0.0408 189              0.0879           0.0387              0.0492 190              0.0992           0.0437              0.0556 191              0.1418           0.0444              0.0975 192              0.1951           0.0444              0.1507 193              0.6105           0.0444              0.5661 194              0.1155           0.0444              0.0712 195              0.0795           0.0350              0.0445 196              0.0633           0.0279              0.0354 197              0.0718           0.0316              0.0402 198              0.0649           0.0286              0.0363 199              0.0598           0.0263              0.0335 200              0.0557           0.0245              0.0312 201              0.0524           0.0231              0.0293 202              0.0496           0.0218              0.0278 203              0.0473           0.0208              0.0265 204              0.0453           0.0199              0.0253 205              0.0435           0.0191              0.0243 206              0.0419           0.0184              0.0235 207              0.0405           0.0178              0.0227 208              0.0392           0.0173              0.0219 209              0.0380           0.0167              0.0213 210              0.0370           0.0163              0.0207 211              0.0360           0.0159              0.0202 212              0.0351           0.0155              0.0197 213              0.0343           0.0151              0.0192 214              0.0335           0.0148              0.0188 215              0.0328           0.0144              0.0184 216              0.0322           0.0141              0.0180 217              0.0270           0.0119              0.0151 218              0.0264           0.0116              0.0148 219              0.0258           0.0114              0.0145 220              0.0253           0.0111              0.0142 221              0.0248           0.0109              0.0139 222              0.0244           0.0107              0.0136 223              0.0239           0.0105              0.0134 224              0.0235           0.0103              0.0132 225              0.0231           0.0102              0.0129 226              0.0227           0.0100              0.0127 227              0.0224           0.0098              0.0125 228              0.0220           0.0097              0.0123 229              0.0217           0.0095              0.0121 230              0.0213           0.0094              0.0120 231              0.0210           0.0093              0.0118 232              0.0207           0.0091              0.0116 233              0.0205           0.0090              0.0115 234              0.0202           0.0089              0.0113 235              0.0199           0.0088              0.0112 236              0.0197           0.0087              0.0110 237              0.0194           0.0086              0.0109 238              0.0192           0.0084              0.0108 239              0.0190           0.0083              0.0106 240              0.0188           0.0083              0.0105 241              0.0185           0.0082              0.0104 242              0.0183           0.0081              0.0103 243              0.0181           0.0080              0.0102 244              0.0179           0.0079              0.0100 245              0.0178           0.0078              0.0099 246              0.0176           0.0077              0.0098 247              0.0174           0.0077              0.0097 248              0.0172           0.0076              0.0096 249              0.0171           0.0075              0.0095 250              0.0169           0.0074              0.0095 251              0.0167           0.0074              0.0094 252              0.0166           0.0073              0.0093 253              0.0164           0.0072              0.0092 254              0.0163           0.0072              0.0091 255              0.0161           0.0071              0.0090 256              0.0160           0.0070              0.0090 257              0.0159           0.0070              0.0089 258              0.0157           0.0069              0.0088 259              0.0156           0.0069              0.0087 260              0.0155           0.0068              0.0087 261              0.0153           0.0068              0.0086 262              0.0152           0.0067              0.0085 263              0.0151           0.0066              0.0085 264              0.0150           0.0066              0.0084 265              0.0149           0.0065              0.0083 266              0.0148           0.0065              0.0083 267              0.0147           0.0065              0.0082 268              0.0146           0.0064              0.0081 269              0.0144           0.0064              0.0081 270              0.0143           0.0063              0.0080 271              0.0142           0.0063              0.0080 272              0.0141           0.0062              0.0079 273              0.0141           0.0062              0.0079 274              0.0140           0.0061              0.0078 275              0.0139           0.0061              0.0078 276              0.0138           0.0061              0.0077 277              0.0137           0.0060              0.0077 278              0.0136           0.0060              0.0076 279              0.0135           0.0059              0.0076 280              0.0134           0.0059              0.0075 281              0.0133           0.0059              0.0075 282              0.0133           0.0058              0.0074 283              0.0132           0.0058              0.0074 284              0.0131           0.0058              0.0073 285              0.0130           0.0057              0.0073 286              0.0129           0.0057              0.0072 287              0.0129           0.0057              0.0072 288              0.0128           0.0056              0.0072 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Total soil rain loss =      3.25(In) Total effective rainfall =      4.80(In) Peak flow rate in flood hydrograph =     13.78(CFS) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++                     24 ‐ H O U R    S T O R M                R u n o f f      H y d r o g r a p h ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐             Hydrograph in   5   Minute intervals ((CFS)) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐   Time(h+m) Volume Ac.Ft   Q(CFS)  0        5.0      10.0      15.0      20.0   ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐     0+ 5       0.0001      0.02  Q         |         |         |         |      0+10       0.0006      0.07  Q         |         |         |         |      0+15       0.0017      0.16  Q         |         |         |         |      0+20       0.0036      0.28  Q         |         |         |         |      0+25       0.0061      0.36  Q         |         |         |         |      0+30       0.0089      0.41  Q         |         |         |         |      0+35       0.0120      0.44  Q         |         |         |         |      0+40       0.0152      0.47  Q         |         |         |         |      0+45       0.0186      0.49  Q         |         |         |         |      0+50       0.0221      0.51  VQ        |         |         |         |      0+55       0.0257      0.52  VQ        |         |         |         |      1+ 0       0.0293      0.53  VQ        |         |         |         |      1+ 5       0.0331      0.54  VQ        |         |         |         |      1+10       0.0369      0.55  VQ        |         |         |         |      1+15       0.0408      0.56  VQ        |         |         |         |      1+20       0.0447      0.57  VQ        |         |         |         |      1+25       0.0487      0.58  VQ        |         |         |         |      1+30       0.0527      0.58  VQ        |         |         |         |      1+35       0.0567      0.59  VQ        |         |         |         |      1+40       0.0608      0.59  VQ        |         |         |         |      1+45       0.0649      0.60  VQ        |         |         |         |      1+50       0.0691      0.60  |Q        |         |         |         |      1+55       0.0733      0.61  |Q        |         |         |         |      2+ 0       0.0775      0.61  |Q        |         |         |         |      2+ 5       0.0818      0.62  |Q        |         |         |         |      2+10       0.0860      0.62  |Q        |         |         |         |      2+15       0.0903      0.62  |Q        |         |         |         |      2+20       0.0946      0.63  |Q        |         |         |         |      2+25       0.0990      0.63  |Q        |         |         |         |      2+30       0.1034      0.63  |Q        |         |         |         |      2+35       0.1077      0.64  |Q        |         |         |         |      2+40       0.1121      0.64  |Q        |         |         |         |      2+45       0.1165      0.64  |Q        |         |         |         |      2+50       0.1210      0.64  |Q        |         |         |         |      2+55       0.1254      0.64  |Q        |         |         |         |      3+ 0       0.1299      0.65  |Q        |         |         |         |      3+ 5       0.1343      0.65  |Q        |         |         |         |      3+10       0.1388      0.65  |QV       |         |         |         |      3+15       0.1433      0.65  |QV       |         |         |         |      3+20       0.1478      0.66  |QV       |         |         |         |      3+25       0.1524      0.66  |QV       |         |         |         |      3+30       0.1569      0.66  |QV       |         |         |         |      3+35       0.1615      0.66  |QV       |         |         |         |      3+40       0.1660      0.66  |QV       |         |         |         |      3+45       0.1706      0.67  |QV       |         |         |         |      3+50       0.1752      0.67  |QV       |         |         |         |      3+55       0.1799      0.67  |QV       |         |         |         |      4+ 0       0.1845      0.67  |QV       |         |         |         |      4+ 5       0.1892      0.68  |QV       |         |         |         |      4+10       0.1939      0.68  |QV       |         |         |         |      4+15       0.1986      0.68  |QV       |         |         |         |      4+20       0.2033      0.68  |QV       |         |         |         |      4+25       0.2080      0.69  |Q V      |         |         |         |      4+30       0.2127      0.69  |Q V      |         |         |         |      4+35       0.2175      0.69  |Q V      |         |         |         |      4+40       0.2223      0.69  |Q V      |         |         |         |      4+45       0.2271      0.70  |Q V      |         |         |         |      4+50       0.2319      0.70  |Q V      |         |         |         |      4+55       0.2368      0.70  |Q V      |         |         |         |      5+ 0       0.2416      0.71  |Q V      |         |         |         |      5+ 5       0.2465      0.71  |Q V      |         |         |         |      5+10       0.2514      0.71  |Q V      |         |         |         |      5+15       0.2563      0.71  |Q V      |         |         |         |      5+20       0.2613      0.72  |Q V      |         |         |         |      5+25       0.2662      0.72  |Q V      |         |         |         |      5+30       0.2712      0.72  |Q V      |         |         |         |      5+35       0.2762      0.73  |Q  V     |         |         |         |      5+40       0.2812      0.73  |Q  V     |         |         |         |      5+45       0.2862      0.73  |Q  V     |         |         |         |      5+50       0.2913      0.74  |Q  V     |         |         |         |      5+55       0.2964      0.74  |Q  V     |         |         |         |      6+ 0       0.3015      0.74  |Q  V     |         |         |         |      6+ 5       0.3066      0.74  |Q  V     |         |         |         |      6+10       0.3118      0.75  |Q  V     |         |         |         |      6+15       0.3170      0.75  |Q  V     |         |         |         |      6+20       0.3222      0.75  |Q  V     |         |         |         |      6+25       0.3274      0.76  |Q  V     |         |         |         |      6+30       0.3326      0.76  |Q  V     |         |         |         |      6+35       0.3379      0.76  |Q  V     |         |         |         |      6+40       0.3432      0.77  |Q   V    |         |         |         |      6+45       0.3485      0.77  |Q   V    |         |         |         |      6+50       0.3538      0.78  |Q   V    |         |         |         |      6+55       0.3592      0.78  |Q   V    |         |         |         |      7+ 0       0.3646      0.78  |Q   V    |         |         |         |      7+ 5       0.3700      0.79  |Q   V    |         |         |         |      7+10       0.3755      0.79  |Q   V    |         |         |         |      7+15       0.3809      0.79  |Q   V    |         |         |         |      7+20       0.3864      0.80  |Q   V    |         |         |         |      7+25       0.3919      0.80  |Q   V    |         |         |         |      7+30       0.3975      0.81  |Q   V    |         |         |         |      7+35       0.4031      0.81  |Q   V    |         |         |         |      7+40       0.4087      0.81  |Q   V    |         |         |         |      7+45       0.4143      0.82  |Q    V   |         |         |         |      7+50       0.4200      0.82  |Q    V   |         |         |         |      7+55       0.4257      0.83  |Q    V   |         |         |         |      8+ 0       0.4314      0.83  |Q    V   |         |         |         |      8+ 5       0.4372      0.84  |Q    V   |         |         |         |      8+10       0.4430      0.84  |Q    V   |         |         |         |      8+15       0.4488      0.85  |Q    V   |         |         |         |      8+20       0.4546      0.85  |Q    V   |         |         |         |      8+25       0.4605      0.85  |Q    V   |         |         |         |      8+30       0.4665      0.86  |Q    V   |         |         |         |      8+35       0.4724      0.86  |Q    V   |         |         |         |      8+40       0.4784      0.87  |Q     V  |         |         |         |      8+45       0.4844      0.87  |Q     V  |         |         |         |      8+50       0.4905      0.88  |Q     V  |         |         |         |      8+55       0.4966      0.89  |Q     V  |         |         |         |      9+ 0       0.5027      0.89  |Q     V  |         |         |         |      9+ 5       0.5089      0.90  |Q     V  |         |         |         |      9+10       0.5151      0.90  |Q     V  |         |         |         |      9+15       0.5213      0.91  |Q     V  |         |         |         |      9+20       0.5276      0.91  |Q     V  |         |         |         |      9+25       0.5340      0.92  |Q     V  |         |         |         |      9+30       0.5403      0.92  |Q     V  |         |         |         |      9+35       0.5467      0.93  |Q      V |         |         |         |      9+40       0.5532      0.94  |Q      V |         |         |         |      9+45       0.5597      0.94  |Q      V |         |         |         |      9+50       0.5662      0.95  |Q      V |         |         |         |      9+55       0.5728      0.96  |Q      V |         |         |         |     10+ 0       0.5794      0.96  |Q      V |         |         |         |     10+ 5       0.5861      0.97  |Q      V |         |         |         |     10+10       0.5928      0.98  |Q      V |         |         |         |     10+15       0.5996      0.98  |Q      V |         |         |         |     10+20       0.6064      0.99  |Q      V |         |         |         |     10+25       0.6133      1.00  |Q      V |         |         |         |     10+30       0.6202      1.01  | Q      V|         |         |         |     10+35       0.6272      1.01  | Q      V|         |         |         |     10+40       0.6342      1.02  | Q      V|         |         |         |     10+45       0.6413      1.03  | Q      V|         |         |         |     10+50       0.6485      1.04  | Q      V|         |         |         |     10+55       0.6557      1.05  | Q      V|         |         |         |     11+ 0       0.6629      1.05  | Q      V|         |         |         |     11+ 5       0.6703      1.06  | Q      V|         |         |         |     11+10       0.6776      1.07  | Q      V|         |         |         |     11+15       0.6851      1.08  | Q       V         |         |         |     11+20       0.6926      1.09  | Q       V         |         |         |     11+25       0.7002      1.10  | Q       V         |         |         |     11+30       0.7078      1.11  | Q       V         |         |         |     11+35       0.7156      1.12  | Q       V         |         |         |     11+40       0.7234      1.13  | Q       V         |         |         |     11+45       0.7312      1.14  | Q       V         |         |         |     11+50       0.7392      1.15  | Q       V         |         |         |     11+55       0.7472      1.17  | Q       V         |         |         |     12+ 0       0.7553      1.18  | Q       |V        |         |         |     12+ 5       0.7635      1.19  | Q       |V        |         |         |     12+10       0.7720      1.23  | Q       |V        |         |         |     12+15       0.7807      1.27  | Q       |V        |         |         |     12+20       0.7899      1.33  | Q       |V        |         |         |     12+25       0.7993      1.37  | Q       |V        |         |         |     12+30       0.8089      1.40  | Q       |V        |         |         |     12+35       0.8188      1.43  | Q       |V        |         |         |     12+40       0.8288      1.45  | Q       | V       |         |         |     12+45       0.8389      1.47  | Q       | V       |         |         |     12+50       0.8492      1.49  | Q       | V       |         |         |     12+55       0.8596      1.52  |  Q      | V       |         |         |     13+ 0       0.8702      1.54  |  Q      | V       |         |         |     13+ 5       0.8809      1.56  |  Q      | V       |         |         |     13+10       0.8918      1.58  |  Q      |  V      |         |         |     13+15       0.9028      1.60  |  Q      |  V      |         |         |     13+20       0.9140      1.62  |  Q      |  V      |         |         |     13+25       0.9253      1.65  |  Q      |  V      |         |         |     13+30       0.9368      1.67  |  Q      |  V      |         |         |     13+35       0.9485      1.69  |  Q      |  V      |         |         |     13+40       0.9603      1.72  |  Q      |   V     |         |         |     13+45       0.9723      1.74  |  Q      |   V     |         |         |     13+50       0.9845      1.77  |  Q      |   V     |         |         |     13+55       0.9969      1.80  |  Q      |   V     |         |         |     14+ 0       1.0095      1.83  |  Q      |   V     |         |         |     14+ 5       1.0223      1.86  |  Q      |   V     |         |         |     14+10       1.0353      1.89  |  Q      |    V    |         |         |     14+15       1.0485      1.92  |  Q      |    V    |         |         |     14+20       1.0620      1.96  |  Q      |    V    |         |         |     14+25       1.0758      2.00  |  Q      |    V    |         |         |     14+30       1.0898      2.04  |   Q     |    V    |         |         |     14+35       1.1042      2.08  |   Q     |     V   |         |         |     14+40       1.1188      2.13  |   Q     |     V   |         |         |     14+45       1.1338      2.18  |   Q     |     V   |         |         |     14+50       1.1491      2.23  |   Q     |     V   |         |         |     14+55       1.1649      2.29  |   Q     |      V  |         |         |     15+ 0       1.1810      2.35  |   Q     |      V  |         |         |     15+ 5       1.1977      2.41  |   Q     |      V  |         |         |     15+10       1.2148      2.49  |   Q     |      V  |         |         |     15+15       1.2325      2.57  |    Q    |       V |         |         |     15+20       1.2509      2.66  |    Q    |       V |         |         |     15+25       1.2698      2.75  |    Q    |       V |         |         |     15+30       1.2890      2.79  |    Q    |       V |         |         |     15+35       1.3083      2.79  |    Q    |        V|         |         |     15+40       1.3275      2.80  |    Q    |        V|         |         |     15+45       1.3474      2.88  |    Q    |        V|         |         |     15+50       1.3685      3.06  |     Q   |         V         |         |     15+55       1.3920      3.42  |     Q   |         V         |         |     16+ 0       1.4204      4.13  |       Q |         V         |         |     16+ 5       1.4632      6.21  |         | Q       |V        |         |     16+10       1.5306      9.79  |         |        Q| V       |         |     16+15       1.6200     12.99  |         |         |  V Q    |         |     16+20       1.7149     13.78  |         |         |    V Q  |         |     16+25       1.7910     11.05  |         |         | Q   V   |         |     16+30       1.8461      8.01  |         |     Q   |      V  |         |     16+35       1.8892      6.26  |         | Q       |      V  |         |     16+40       1.9265      5.41  |         Q         |       V |         |     16+45       1.9601      4.87  |        Q|         |       V |         |     16+50       1.9907      4.44  |       Q |         |        V|         |     16+55       2.0187      4.07  |       Q |         |        V|         |     17+ 0       2.0443      3.72  |      Q  |         |        V|         |     17+ 5       2.0684      3.50  |     Q   |         |         V         |     17+10       2.0907      3.23  |     Q   |         |         V         |     17+15       2.1116      3.04  |     Q   |         |         V         |     17+20       2.1311      2.83  |    Q    |         |         |V        |     17+25       2.1498      2.71  |    Q    |         |         |V        |     17+30       2.1677      2.60  |    Q    |         |         |V        |     17+35       2.1848      2.48  |   Q     |         |         |V        |     17+40       2.2010      2.34  |   Q     |         |         | V       |     17+45       2.2164      2.25  |   Q     |         |         | V       |     17+50       2.2313      2.15  |   Q     |         |         | V       |     17+55       2.2455      2.06  |   Q     |         |         | V       |     18+ 0       2.2591      1.98  |  Q      |         |         |  V      |     18+ 5       2.2722      1.89  |  Q      |         |         |  V      |     18+10       2.2847      1.82  |  Q      |         |         |  V      |     18+15       2.2967      1.74  |  Q      |         |         |  V      |     18+20       2.3080      1.65  |  Q      |         |         |  V      |     18+25       2.3189      1.57  |  Q      |         |         |  V      |     18+30       2.3289      1.46  | Q       |         |         |   V     |     18+35       2.3381      1.34  | Q       |         |         |   V     |     18+40       2.3470      1.29  | Q       |         |         |   V     |     18+45       2.3557      1.26  | Q       |         |         |   V     |     18+50       2.3641      1.22  | Q       |         |         |   V     |     18+55       2.3724      1.19  | Q       |         |         |   V     |     19+ 0       2.3804      1.17  | Q       |         |         |   V     |     19+ 5       2.3882      1.14  | Q       |         |         |   V     |     19+10       2.3959      1.12  | Q       |         |         |    V    |     19+15       2.4035      1.09  | Q       |         |         |    V    |     19+20       2.4109      1.07  | Q       |         |         |    V    |     19+25       2.4181      1.05  | Q       |         |         |    V    |     19+30       2.4252      1.03  | Q       |         |         |    V    |     19+35       2.4322      1.02  | Q       |         |         |    V    |     19+40       2.4391      1.00  |Q        |         |         |    V    |     19+45       2.4459      0.98  |Q        |         |         |    V    |     19+50       2.4526      0.97  |Q        |         |         |    V    |     19+55       2.4591      0.95  |Q        |         |         |    V    |     20+ 0       2.4656      0.94  |Q        |         |         |     V   |     20+ 5       2.4720      0.93  |Q        |         |         |     V   |     20+10       2.4783      0.91  |Q        |         |         |     V   |     20+15       2.4845      0.90  |Q        |         |         |     V   |     20+20       2.4907      0.89  |Q        |         |         |     V   |     20+25       2.4967      0.88  |Q        |         |         |     V   |     20+30       2.5027      0.87  |Q        |         |         |     V   |     20+35       2.5086      0.86  |Q        |         |         |     V   |     20+40       2.5145      0.85  |Q        |         |         |     V   |     20+45       2.5203      0.84  |Q        |         |         |     V   |     20+50       2.5260      0.83  |Q        |         |         |     V   |     20+55       2.5316      0.82  |Q        |         |         |      V  |     21+ 0       2.5372      0.81  |Q        |         |         |      V  |     21+ 5       2.5428      0.81  |Q        |         |         |      V  |     21+10       2.5483      0.80  |Q        |         |         |      V  |     21+15       2.5537      0.79  |Q        |         |         |      V  |     21+20       2.5591      0.78  |Q        |         |         |      V  |     21+25       2.5644      0.77  |Q        |         |         |      V  |     21+30       2.5697      0.77  |Q        |         |         |      V  |     21+35       2.5750      0.76  |Q        |         |         |      V  |     21+40       2.5801      0.75  |Q        |         |         |      V  |     21+45       2.5853      0.75  |Q        |         |         |      V  |     21+50       2.5904      0.74  |Q        |         |         |      V  |     21+55       2.5954      0.73  |Q        |         |         |      V  |     22+ 0       2.6004      0.73  |Q        |         |         |       V |     22+ 5       2.6054      0.72  |Q        |         |         |       V |     22+10       2.6103      0.72  |Q        |         |         |       V |     22+15       2.6152      0.71  |Q        |         |         |       V |     22+20       2.6201      0.70  |Q        |         |         |       V |     22+25       2.6249      0.70  |Q        |         |         |       V |     22+30       2.6297      0.69  |Q        |         |         |       V |     22+35       2.6344      0.69  |Q        |         |         |       V |     22+40       2.6391      0.68  |Q        |         |         |       V |     22+45       2.6438      0.68  |Q        |         |         |       V |     22+50       2.6484      0.67  |Q        |         |         |       V |     22+55       2.6530      0.67  |Q        |         |         |       V |     23+ 0       2.6576      0.66  |Q        |         |         |       V |     23+ 5       2.6621      0.66  |Q        |         |         |       V |     23+10       2.6666      0.65  |Q        |         |         |        V|     23+15       2.6711      0.65  |Q        |         |         |        V|     23+20       2.6756      0.65  |Q        |         |         |        V|     23+25       2.6800      0.64  |Q        |         |         |        V|     23+30       2.6844      0.64  |Q        |         |         |        V|     23+35       2.6887      0.63  |Q        |         |         |        V|     23+40       2.6930      0.63  |Q        |         |         |        V|     23+45       2.6973      0.62  |Q        |         |         |        V|     23+50       2.7016      0.62  |Q        |         |         |        V|     23+55       2.7059      0.62  |Q        |         |         |        V|     24+ 0       2.7101      0.61  |Q        |         |         |        V|     24+ 5       2.7142      0.59  |Q        |         |         |        V|     24+10       2.7179      0.54  |Q        |         |         |        V|     24+15       2.7209      0.44  Q         |         |         |        V|     24+20       2.7232      0.32  Q         |         |         |        V|     24+25       2.7248      0.24  Q         |         |         |        V|     24+30       2.7261      0.19  Q         |         |         |        V|     24+35       2.7272      0.16  Q         |         |         |        V|     24+40       2.7281      0.13  Q         |         |         |        V|     24+45       2.7288      0.11  Q         |         |         |        V|     24+50       2.7295      0.10  Q         |         |         |        V|     24+55       2.7301      0.08  Q         |         |         |        V|     25+ 0       2.7305      0.07  Q         |         |         |        V|     25+ 5       2.7310      0.06  Q         |         |         |        V|     25+10       2.7313      0.05  Q         |         |         |        V|     25+15       2.7316      0.05  Q         |         |         |        V|     25+20       2.7319      0.04  Q         |         |         |        V|     25+25       2.7321      0.03  Q         |         |         |        V|     25+30       2.7323      0.03  Q         |         |         |        V|     25+35       2.7325      0.02  Q         |         |         |        V|     25+40       2.7327      0.02  Q         |         |         |        V|     25+45       2.7328      0.02  Q         |         |         |        V|     25+50       2.7329      0.01  Q         |         |         |        V|     25+55       2.7330      0.01  Q         |         |         |        V|     26+ 0       2.7330      0.01  Q         |         |         |        V|     26+ 5       2.7331      0.01  Q         |         |         |        V|     26+10       2.7331      0.01  Q         |         |         |        V|     26+15       2.7332      0.00  Q         |         |         |        V|     26+20       2.7332      0.00  Q         |         |         |        V|     26+25       2.7332      0.00  Q         |         |         |        V|  ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐             PROPOSED CONDITION               U n i t   H y d r o g r a p h    A n a l y s i s Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2018, Version 9.0 Study date  12/01/22 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method Manual date ‐ August 1986 Program License Serial Number 6427 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Storm Event Year = 100 Antecedent Moisture Condition = 2  English (in‐lb) Input Units Used  English Rainfall Data (Inches) Input Values Used  English Units used in output format Area averaged rainfall intensity isohyetal data: Sub‐Area        Duration        Isohyetal (Ac.)            (hours)         (In) Rainfall data for year 100      6.84            1           1.65 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 100      6.84            6           4.28 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 100      6.84           24           8.05 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ******** SCS curve  SCS curve     Area     Area     Fp(Fig C6)    Ap      Fm No.(AMCII) NO.(AMC 2)    (Ac.)    Fraction     (In/Hr)  (dec.)   (In/Hr)  32.0      32.0          6.84      1.000     0.978    0.350    0.342 Area‐averaged adjusted loss rate Fm (In/Hr) =  0.342 ********* Area‐Averaged low loss rate fraction, Yb ********** Area       Area          SCS CN    SCS CN      S     Pervious  (Ac.)      Fract         (AMC2)    (AMC2)           Yield Fr      2.39   0.350         32.0      32.0      21.25     0.072      4.45   0.650         98.0      98.0       0.20     0.970 Area‐averaged catchment yield fraction, Y =  0.656 Area‐averaged low loss fraction, Yb =  0.344 User entry of time of concentration  =   0.144 (hours) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area =       6.84(Ac.) Catchment Lag time =   0.115 hours Unit interval =   5.000 minutes Unit interval percentage of lag time = 72.3380 Hydrograph baseflow =     0.00(CFS) Average maximum watershed loss rate(Fm) =  0.342(In/Hr) Average low loss rate fraction (Yb) = 0.344 (decimal) VALLEY DEVELOPED S‐Graph Selected Computed peak 5‐minute rainfall =  0.611(In) Computed peak 30‐minute rainfall =  1.250(In) Specified peak 1‐hour rainfall =  1.650(In) Computed peak 3‐hour rainfall =  2.960(In) Specified peak 6‐hour rainfall =  4.280(In) Specified peak 24‐hour rainfall =  8.050(In) Rainfall depth area reduction factors: Using a total area of       6.84(Ac.) (Ref: fig. E‐4) 5‐minute factor = 1.000     Adjusted rainfall =  0.610(In) 30‐minute factor = 1.000    Adjusted rainfall =  1.250(In) 1‐hour factor = 1.000       Adjusted rainfall =  1.649(In) 3‐hour factor = 1.000       Adjusted rainfall =  2.960(In) 6‐hour factor = 1.000       Adjusted rainfall =  4.280(In) 24‐hour factor = 1.000      Adjusted rainfall =  8.050(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ U n i t  H y d r o g r a p h  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph Number            Mean values             ((CFS)) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ (K =        82.72 (CFS))   1                9.344                   7.729   2               55.996                  38.591   3               90.659                  28.674   4               98.201                   6.239   5              100.000                   1.488 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Peak Unit   Adjusted mass rainfall  Unit rainfall Number              (In)                (In)   1              0.6105               0.6105   2              0.8055               0.1951   3              0.9474               0.1418   4              1.0629               0.1155   5              1.1621               0.0992   6              1.2501               0.0879   7              1.3296               0.0795   8              1.4025               0.0729   9              1.4702               0.0677  10              1.5335               0.0633  11              1.5930               0.0596  12              1.6495               0.0564  13              1.7213               0.0718  14              1.7905               0.0692  15              1.8575               0.0670  16              1.9224               0.0649  17              1.9854               0.0630  18              2.0468               0.0613  19              2.1065               0.0598  20              2.1648               0.0583  21              2.2218               0.0570  22              2.2775               0.0557  23              2.3320               0.0545  24              2.3854               0.0534  25              2.4378               0.0524  26              2.4892               0.0514  27              2.5397               0.0505  28              2.5894               0.0496  29              2.6382               0.0488  30              2.6862               0.0480  31              2.7335               0.0473  32              2.7801               0.0466  33              2.8260               0.0459  34              2.8713               0.0453  35              2.9159               0.0446  36              2.9600               0.0440  37              3.0034               0.0435  38              3.0463               0.0429  39              3.0887               0.0424  40              3.1306               0.0419  41              3.1720               0.0414  42              3.2129               0.0409  43              3.2534               0.0405  44              3.2934               0.0400  45              3.3330               0.0396  46              3.3722               0.0392  47              3.4111               0.0388  48              3.4495               0.0384  49              3.4875               0.0380  50              3.5252               0.0377  51              3.5625               0.0373  52              3.5995               0.0370  53              3.6362               0.0367  54              3.6725               0.0363  55              3.7086               0.0360  56              3.7443               0.0357  57              3.7797               0.0354  58              3.8148               0.0351  59              3.8497               0.0349  60              3.8843               0.0346  61              3.9186               0.0343  62              3.9526               0.0340  63              3.9864               0.0338  64              4.0200               0.0335  65              4.0532               0.0333  66              4.0863               0.0331  67              4.1191               0.0328  68              4.1517               0.0326  69              4.1841               0.0324  70              4.2162               0.0322  71              4.2482               0.0319  72              4.2799               0.0317  73              4.3069               0.0270  74              4.3337               0.0268  75              4.3603               0.0266  76              4.3867               0.0264  77              4.4129               0.0262  78              4.4389               0.0260  79              4.4647               0.0258  80              4.4904               0.0257  81              4.5159               0.0255  82              4.5412               0.0253  83              4.5664               0.0252  84              4.5914               0.0250  85              4.6162               0.0248  86              4.6409               0.0247  87              4.6654               0.0245  88              4.6897               0.0244  89              4.7139               0.0242  90              4.7380               0.0241  91              4.7619               0.0239  92              4.7857               0.0238  93              4.8093               0.0236  94              4.8328               0.0235  95              4.8562               0.0234  96              4.8794               0.0232  97              4.9025               0.0231  98              4.9255               0.0230  99              4.9483               0.0228 100              4.9710               0.0227 101              4.9936               0.0226 102              5.0161               0.0225 103              5.0385               0.0224 104              5.0607               0.0222 105              5.0828               0.0221 106              5.1048               0.0220 107              5.1267               0.0219 108              5.1485               0.0218 109              5.1701               0.0217 110              5.1917               0.0216 111              5.2132               0.0215 112              5.2345               0.0213 113              5.2558               0.0212 114              5.2769               0.0211 115              5.2979               0.0210 116              5.3189               0.0209 117              5.3397               0.0208 118              5.3605               0.0207 119              5.3811               0.0207 120              5.4017               0.0206 121              5.4222               0.0205 122              5.4425               0.0204 123              5.4628               0.0203 124              5.4830               0.0202 125              5.5031               0.0201 126              5.5231               0.0200 127              5.5431               0.0199 128              5.5629               0.0198 129              5.5827               0.0198 130              5.6024               0.0197 131              5.6220               0.0196 132              5.6415               0.0195 133              5.6609               0.0194 134              5.6803               0.0194 135              5.6996               0.0193 136              5.7188               0.0192 137              5.7379               0.0191 138              5.7569               0.0190 139              5.7759               0.0190 140              5.7948               0.0189 141              5.8136               0.0188 142              5.8324               0.0188 143              5.8511               0.0187 144              5.8697               0.0186 145              5.8882               0.0185 146              5.9067               0.0185 147              5.9251               0.0184 148              5.9434               0.0183 149              5.9617               0.0183 150              5.9799               0.0182 151              5.9980               0.0181 152              6.0161               0.0181 153              6.0341               0.0180 154              6.0520               0.0179 155              6.0699               0.0179 156              6.0877               0.0178 157              6.1055               0.0178 158              6.1232               0.0177 159              6.1408               0.0176 160              6.1584               0.0176 161              6.1759               0.0175 162              6.1933               0.0175 163              6.2107               0.0174 164              6.2280               0.0173 165              6.2453               0.0173 166              6.2625               0.0172 167              6.2797               0.0172 168              6.2968               0.0171 169              6.3139               0.0171 170              6.3309               0.0170 171              6.3478               0.0169 172              6.3647               0.0169 173              6.3815               0.0168 174              6.3983               0.0168 175              6.4150               0.0167 176              6.4317               0.0167 177              6.4484               0.0166 178              6.4649               0.0166 179              6.4815               0.0165 180              6.4979               0.0165 181              6.5144               0.0164 182              6.5307               0.0164 183              6.5471               0.0163 184              6.5633               0.0163 185              6.5796               0.0162 186              6.5958               0.0162 187              6.6119               0.0161 188              6.6280               0.0161 189              6.6440               0.0160 190              6.6600               0.0160 191              6.6760               0.0160 192              6.6919               0.0159 193              6.7077               0.0159 194              6.7235               0.0158 195              6.7393               0.0158 196              6.7550               0.0157 197              6.7707               0.0157 198              6.7864               0.0156 199              6.8020               0.0156 200              6.8175               0.0156 201              6.8330               0.0155 202              6.8485               0.0155 203              6.8639               0.0154 204              6.8793               0.0154 205              6.8947               0.0153 206              6.9100               0.0153 207              6.9252               0.0153 208              6.9405               0.0152 209              6.9557               0.0152 210              6.9708               0.0151 211              6.9859               0.0151 212              7.0010               0.0151 213              7.0160               0.0150 214              7.0310               0.0150 215              7.0459               0.0150 216              7.0609               0.0149 217              7.0757               0.0149 218              7.0906               0.0148 219              7.1054               0.0148 220              7.1202               0.0148 221              7.1349               0.0147 222              7.1496               0.0147 223              7.1642               0.0147 224              7.1789               0.0146 225              7.1934               0.0146 226              7.2080               0.0146 227              7.2225               0.0145 228              7.2370               0.0145 229              7.2514               0.0144 230              7.2659               0.0144 231              7.2802               0.0144 232              7.2946               0.0143 233              7.3089               0.0143 234              7.3232               0.0143 235              7.3374               0.0142 236              7.3516               0.0142 237              7.3658               0.0142 238              7.3799               0.0141 239              7.3941               0.0141 240              7.4081               0.0141 241              7.4222               0.0141 242              7.4362               0.0140 243              7.4502               0.0140 244              7.4642               0.0140 245              7.4781               0.0139 246              7.4920               0.0139 247              7.5058               0.0139 248              7.5197               0.0138 249              7.5335               0.0138 250              7.5472               0.0138 251              7.5610               0.0137 252              7.5747               0.0137 253              7.5884               0.0137 254              7.6020               0.0137 255              7.6157               0.0136 256              7.6293               0.0136 257              7.6428               0.0136 258              7.6564               0.0135 259              7.6699               0.0135 260              7.6833               0.0135 261              7.6968               0.0135 262              7.7102               0.0134 263              7.7236               0.0134 264              7.7370               0.0134 265              7.7503               0.0133 266              7.7636               0.0133 267              7.7769               0.0133 268              7.7902               0.0133 269              7.8034               0.0132 270              7.8166               0.0132 271              7.8298               0.0132 272              7.8430               0.0132 273              7.8561               0.0131 274              7.8692               0.0131 275              7.8823               0.0131 276              7.8953               0.0130 277              7.9083               0.0130 278              7.9213               0.0130 279              7.9343               0.0130 280              7.9473               0.0129 281              7.9602               0.0129 282              7.9731               0.0129 283              7.9859               0.0129 284              7.9988               0.0128 285              8.0116               0.0128 286              8.0244               0.0128 287              8.0372               0.0128 288              8.0499               0.0127 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Unit              Unit            Unit              Effective Period            Rainfall        Soil‐Loss         Rainfall (number)            (In)          (In)                 (In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐   1              0.0127           0.0044              0.0084   2              0.0128           0.0044              0.0084   3              0.0128           0.0044              0.0084   4              0.0128           0.0044              0.0084   5              0.0129           0.0044              0.0085   6              0.0129           0.0044              0.0085   7              0.0130           0.0045              0.0085   8              0.0130           0.0045              0.0085   9              0.0130           0.0045              0.0086  10              0.0131           0.0045              0.0086  11              0.0131           0.0045              0.0086  12              0.0132           0.0045              0.0086  13              0.0132           0.0045              0.0087  14              0.0132           0.0046              0.0087  15              0.0133           0.0046              0.0087  16              0.0133           0.0046              0.0087  17              0.0134           0.0046              0.0088  18              0.0134           0.0046              0.0088  19              0.0135           0.0046              0.0088  20              0.0135           0.0046              0.0088  21              0.0135           0.0047              0.0089  22              0.0136           0.0047              0.0089  23              0.0136           0.0047              0.0089  24              0.0137           0.0047              0.0090  25              0.0137           0.0047              0.0090  26              0.0137           0.0047              0.0090  27              0.0138           0.0048              0.0091  28              0.0138           0.0048              0.0091  29              0.0139           0.0048              0.0091  30              0.0139           0.0048              0.0091  31              0.0140           0.0048              0.0092  32              0.0140           0.0048              0.0092  33              0.0141           0.0048              0.0092  34              0.0141           0.0049              0.0093  35              0.0142           0.0049              0.0093  36              0.0142           0.0049              0.0093  37              0.0143           0.0049              0.0094  38              0.0143           0.0049              0.0094  39              0.0144           0.0050              0.0094  40              0.0144           0.0050              0.0095  41              0.0145           0.0050              0.0095  42              0.0145           0.0050              0.0095  43              0.0146           0.0050              0.0096  44              0.0146           0.0050              0.0096  45              0.0147           0.0051              0.0096  46              0.0147           0.0051              0.0097  47              0.0148           0.0051              0.0097  48              0.0148           0.0051              0.0097  49              0.0149           0.0051              0.0098  50              0.0150           0.0051              0.0098  51              0.0150           0.0052              0.0099  52              0.0151           0.0052              0.0099  53              0.0151           0.0052              0.0099  54              0.0152           0.0052              0.0100  55              0.0153           0.0053              0.0100  56              0.0153           0.0053              0.0100  57              0.0154           0.0053              0.0101  58              0.0154           0.0053              0.0101  59              0.0155           0.0053              0.0102  60              0.0156           0.0054              0.0102  61              0.0156           0.0054              0.0103  62              0.0157           0.0054              0.0103  63              0.0158           0.0054              0.0103  64              0.0158           0.0054              0.0104  65              0.0159           0.0055              0.0104  66              0.0160           0.0055              0.0105  67              0.0160           0.0055              0.0105  68              0.0161           0.0055              0.0105  69              0.0162           0.0056              0.0106  70              0.0162           0.0056              0.0106  71              0.0163           0.0056              0.0107  72              0.0164           0.0056              0.0107  73              0.0165           0.0057              0.0108  74              0.0165           0.0057              0.0108  75              0.0166           0.0057              0.0109  76              0.0167           0.0057              0.0109  77              0.0168           0.0058              0.0110  78              0.0168           0.0058              0.0110  79              0.0169           0.0058              0.0111  80              0.0170           0.0059              0.0111  81              0.0171           0.0059              0.0112  82              0.0172           0.0059              0.0113  83              0.0173           0.0059              0.0113  84              0.0173           0.0060              0.0114  85              0.0175           0.0060              0.0114  86              0.0175           0.0060              0.0115  87              0.0176           0.0061              0.0116  88              0.0177           0.0061              0.0116  89              0.0178           0.0061              0.0117  90              0.0179           0.0062              0.0117  91              0.0180           0.0062              0.0118  92              0.0181           0.0062              0.0118  93              0.0182           0.0063              0.0119  94              0.0183           0.0063              0.0120  95              0.0184           0.0063              0.0121  96              0.0185           0.0064              0.0121  97              0.0186           0.0064              0.0122  98              0.0187           0.0064              0.0122  99              0.0188           0.0065              0.0123 100              0.0189           0.0065              0.0124 101              0.0190           0.0066              0.0125 102              0.0191           0.0066              0.0125 103              0.0193           0.0066              0.0126 104              0.0194           0.0067              0.0127 105              0.0195           0.0067              0.0128 106              0.0196           0.0067              0.0128 107              0.0198           0.0068              0.0130 108              0.0198           0.0068              0.0130 109              0.0200           0.0069              0.0131 110              0.0201           0.0069              0.0132 111              0.0203           0.0070              0.0133 112              0.0204           0.0070              0.0134 113              0.0206           0.0071              0.0135 114              0.0207           0.0071              0.0135 115              0.0208           0.0072              0.0137 116              0.0209           0.0072              0.0137 117              0.0211           0.0073              0.0139 118              0.0212           0.0073              0.0139 119              0.0215           0.0074              0.0141 120              0.0216           0.0074              0.0141 121              0.0218           0.0075              0.0143 122              0.0219           0.0075              0.0144 123              0.0221           0.0076              0.0145 124              0.0222           0.0077              0.0146 125              0.0225           0.0077              0.0147 126              0.0226           0.0078              0.0148 127              0.0228           0.0079              0.0150 128              0.0230           0.0079              0.0151 129              0.0232           0.0080              0.0152 130              0.0234           0.0080              0.0153 131              0.0236           0.0081              0.0155 132              0.0238           0.0082              0.0156 133              0.0241           0.0083              0.0158 134              0.0242           0.0083              0.0159 135              0.0245           0.0084              0.0161 136              0.0247           0.0085              0.0162 137              0.0250           0.0086              0.0164 138              0.0252           0.0087              0.0165 139              0.0255           0.0088              0.0167 140              0.0257           0.0088              0.0168 141              0.0260           0.0090              0.0171 142              0.0262           0.0090              0.0172 143              0.0266           0.0092              0.0174 144              0.0268           0.0092              0.0176 145              0.0317           0.0109              0.0208 146              0.0319           0.0110              0.0209 147              0.0324           0.0111              0.0212 148              0.0326           0.0112              0.0214 149              0.0331           0.0114              0.0217 150              0.0333           0.0115              0.0218 151              0.0338           0.0116              0.0222 152              0.0340           0.0117              0.0223 153              0.0346           0.0119              0.0227 154              0.0349           0.0120              0.0229 155              0.0354           0.0122              0.0232 156              0.0357           0.0123              0.0234 157              0.0363           0.0125              0.0238 158              0.0367           0.0126              0.0240 159              0.0373           0.0129              0.0245 160              0.0377           0.0130              0.0247 161              0.0384           0.0132              0.0252 162              0.0388           0.0134              0.0254 163              0.0396           0.0136              0.0260 164              0.0400           0.0138              0.0263 165              0.0409           0.0141              0.0268 166              0.0414           0.0143              0.0271 167              0.0424           0.0146              0.0278 168              0.0429           0.0148              0.0281 169              0.0440           0.0152              0.0289 170              0.0446           0.0154              0.0293 171              0.0459           0.0158              0.0301 172              0.0466           0.0160              0.0305 173              0.0480           0.0165              0.0315 174              0.0488           0.0168              0.0320 175              0.0505           0.0174              0.0331 176              0.0514           0.0177              0.0337 177              0.0534           0.0184              0.0350 178              0.0545           0.0188              0.0358 179              0.0570           0.0196              0.0373 180              0.0583           0.0201              0.0382 181              0.0613           0.0211              0.0402 182              0.0630           0.0217              0.0413 183              0.0670           0.0231              0.0439 184              0.0692           0.0238              0.0454 185              0.0564           0.0194              0.0370 186              0.0596           0.0205              0.0391 187              0.0677           0.0233              0.0444 188              0.0729           0.0251              0.0478 189              0.0879           0.0285              0.0594 190              0.0992           0.0285              0.0707 191              0.1418           0.0285              0.1133 192              0.1951           0.0285              0.1665 193              0.6105           0.0285              0.5820 194              0.1155           0.0285              0.0870 195              0.0795           0.0274              0.0521 196              0.0633           0.0218              0.0415 197              0.0718           0.0247              0.0471 198              0.0649           0.0223              0.0426 199              0.0598           0.0206              0.0392 200              0.0557           0.0192              0.0365 201              0.0524           0.0180              0.0344 202              0.0496           0.0171              0.0325 203              0.0473           0.0163              0.0310 204              0.0453           0.0156              0.0297 205              0.0435           0.0150              0.0285 206              0.0419           0.0144              0.0275 207              0.0405           0.0139              0.0265 208              0.0392           0.0135              0.0257 209              0.0380           0.0131              0.0249 210              0.0370           0.0127              0.0243 211              0.0360           0.0124              0.0236 212              0.0351           0.0121              0.0230 213              0.0343           0.0118              0.0225 214              0.0335           0.0115              0.0220 215              0.0328           0.0113              0.0215 216              0.0322           0.0111              0.0211 217              0.0270           0.0093              0.0177 218              0.0264           0.0091              0.0173 219              0.0258           0.0089              0.0169 220              0.0253           0.0087              0.0166 221              0.0248           0.0085              0.0163 222              0.0244           0.0084              0.0160 223              0.0239           0.0082              0.0157 224              0.0235           0.0081              0.0154 225              0.0231           0.0080              0.0151 226              0.0227           0.0078              0.0149 227              0.0224           0.0077              0.0147 228              0.0220           0.0076              0.0144 229              0.0217           0.0075              0.0142 230              0.0213           0.0074              0.0140 231              0.0210           0.0072              0.0138 232              0.0207           0.0071              0.0136 233              0.0205           0.0070              0.0134 234              0.0202           0.0070              0.0132 235              0.0199           0.0069              0.0131 236              0.0197           0.0068              0.0129 237              0.0194           0.0067              0.0127 238              0.0192           0.0066              0.0126 239              0.0190           0.0065              0.0124 240              0.0188           0.0065              0.0123 241              0.0185           0.0064              0.0122 242              0.0183           0.0063              0.0120 243              0.0181           0.0062              0.0119 244              0.0179           0.0062              0.0118 245              0.0178           0.0061              0.0116 246              0.0176           0.0060              0.0115 247              0.0174           0.0060              0.0114 248              0.0172           0.0059              0.0113 249              0.0171           0.0059              0.0112 250              0.0169           0.0058              0.0111 251              0.0167           0.0058              0.0110 252              0.0166           0.0057              0.0109 253              0.0164           0.0057              0.0108 254              0.0163           0.0056              0.0107 255              0.0161           0.0056              0.0106 256              0.0160           0.0055              0.0105 257              0.0159           0.0055              0.0104 258              0.0157           0.0054              0.0103 259              0.0156           0.0054              0.0102 260              0.0155           0.0053              0.0101 261              0.0153           0.0053              0.0101 262              0.0152           0.0052              0.0100 263              0.0151           0.0052              0.0099 264              0.0150           0.0052              0.0098 265              0.0149           0.0051              0.0098 266              0.0148           0.0051              0.0097 267              0.0147           0.0050              0.0096 268              0.0146           0.0050              0.0095 269              0.0144           0.0050              0.0095 270              0.0143           0.0049              0.0094 271              0.0142           0.0049              0.0093 272              0.0141           0.0049              0.0093 273              0.0141           0.0048              0.0092 274              0.0140           0.0048              0.0092 275              0.0139           0.0048              0.0091 276              0.0138           0.0047              0.0090 277              0.0137           0.0047              0.0090 278              0.0136           0.0047              0.0089 279              0.0135           0.0047              0.0089 280              0.0134           0.0046              0.0088 281              0.0133           0.0046              0.0087 282              0.0133           0.0046              0.0087 283              0.0132           0.0045              0.0086 284              0.0131           0.0045              0.0086 285              0.0130           0.0045              0.0085 286              0.0129           0.0045              0.0085 287              0.0129           0.0044              0.0084 288              0.0128           0.0044              0.0084 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Total soil rain loss =      2.51(In) Total effective rainfall =      5.54(In) Peak flow rate in flood hydrograph =     28.72(CFS) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++                     24 ‐ H O U R    S T O R M                R u n o f f      H y d r o g r a p h ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐             Hydrograph in   5   Minute intervals ((CFS)) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐   Time(h+m) Volume Ac.Ft   Q(CFS)  0        7.5      15.0      22.5      30.0   ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐     0+ 5       0.0004      0.06  Q         |         |         |         |      0+10       0.0031      0.39  Q         |         |         |         |      0+15       0.0074      0.63  Q         |         |         |         |      0+20       0.0121      0.68  Q         |         |         |         |      0+25       0.0169      0.70  Q         |         |         |         |      0+30       0.0217      0.70  Q         |         |         |         |      0+35       0.0266      0.70  Q         |         |         |         |      0+40       0.0314      0.70  Q         |         |         |         |      0+45       0.0362      0.70  Q         |         |         |         |      0+50       0.0411      0.71  Q         |         |         |         |      0+55       0.0460      0.71  Q         |         |         |         |      1+ 0       0.0509      0.71  Q         |         |         |         |      1+ 5       0.0558      0.71  Q         |         |         |         |      1+10       0.0607      0.71  Q         |         |         |         |      1+15       0.0657      0.72  Q         |         |         |         |      1+20       0.0706      0.72  Q         |         |         |         |      1+25       0.0756      0.72  Q         |         |         |         |      1+30       0.0806      0.72  QV        |         |         |         |      1+35       0.0856      0.73  QV        |         |         |         |      1+40       0.0906      0.73  QV        |         |         |         |      1+45       0.0956      0.73  QV        |         |         |         |      1+50       0.1007      0.73  QV        |         |         |         |      1+55       0.1057      0.74  QV        |         |         |         |      2+ 0       0.1108      0.74  QV        |         |         |         |      2+ 5       0.1159      0.74  QV        |         |         |         |      2+10       0.1210      0.74  QV        |         |         |         |      2+15       0.1261      0.74  QV        |         |         |         |      2+20       0.1313      0.75  QV        |         |         |         |      2+25       0.1364      0.75  QV        |         |         |         |      2+30       0.1416      0.75  |Q        |         |         |         |      2+35       0.1468      0.75  |Q        |         |         |         |      2+40       0.1520      0.76  |Q        |         |         |         |      2+45       0.1573      0.76  |Q        |         |         |         |      2+50       0.1625      0.76  |QV       |         |         |         |      2+55       0.1678      0.76  |QV       |         |         |         |      3+ 0       0.1731      0.77  |QV       |         |         |         |      3+ 5       0.1784      0.77  |QV       |         |         |         |      3+10       0.1837      0.77  |QV       |         |         |         |      3+15       0.1890      0.78  |QV       |         |         |         |      3+20       0.1944      0.78  |QV       |         |         |         |      3+25       0.1998      0.78  |QV       |         |         |         |      3+30       0.2052      0.78  |QV       |         |         |         |      3+35       0.2106      0.79  |QV       |         |         |         |      3+40       0.2160      0.79  |QV       |         |         |         |      3+45       0.2215      0.79  |QV       |         |         |         |      3+50       0.2270      0.80  |QV       |         |         |         |      3+55       0.2325      0.80  |QV       |         |         |         |      4+ 0       0.2380      0.80  |Q V      |         |         |         |      4+ 5       0.2435      0.80  |Q V      |         |         |         |      4+10       0.2491      0.81  |Q V      |         |         |         |      4+15       0.2546      0.81  |Q V      |         |         |         |      4+20       0.2603      0.81  |Q V      |         |         |         |      4+25       0.2659      0.82  |Q V      |         |         |         |      4+30       0.2715      0.82  |Q V      |         |         |         |      4+35       0.2772      0.82  |Q V      |         |         |         |      4+40       0.2829      0.83  |Q V      |         |         |         |      4+45       0.2886      0.83  |Q V      |         |         |         |      4+50       0.2943      0.83  |Q V      |         |         |         |      4+55       0.3001      0.84  |Q V      |         |         |         |      5+ 0       0.3059      0.84  |Q V      |         |         |         |      5+ 5       0.3117      0.84  |Q V      |         |         |         |      5+10       0.3175      0.85  |Q  V     |         |         |         |      5+15       0.3233      0.85  |Q  V     |         |         |         |      5+20       0.3292      0.85  |Q  V     |         |         |         |      5+25       0.3351      0.86  |Q  V     |         |         |         |      5+30       0.3410      0.86  |Q  V     |         |         |         |      5+35       0.3470      0.86  |Q  V     |         |         |         |      5+40       0.3530      0.87  |Q  V     |         |         |         |      5+45       0.3590      0.87  |Q  V     |         |         |         |      5+50       0.3650      0.88  |Q  V     |         |         |         |      5+55       0.3711      0.88  |Q  V     |         |         |         |      6+ 0       0.3771      0.88  |Q  V     |         |         |         |      6+ 5       0.3832      0.89  |Q  V     |         |         |         |      6+10       0.3894      0.89  |Q  V     |         |         |         |      6+15       0.3955      0.90  |Q   V    |         |         |         |      6+20       0.4017      0.90  |Q   V    |         |         |         |      6+25       0.4080      0.90  |Q   V    |         |         |         |      6+30       0.4142      0.91  |Q   V    |         |         |         |      6+35       0.4205      0.91  |Q   V    |         |         |         |      6+40       0.4268      0.92  |Q   V    |         |         |         |      6+45       0.4331      0.92  |Q   V    |         |         |         |      6+50       0.4395      0.93  |Q   V    |         |         |         |      6+55       0.4459      0.93  |Q   V    |         |         |         |      7+ 0       0.4524      0.93  |Q   V    |         |         |         |      7+ 5       0.4588      0.94  |Q   V    |         |         |         |      7+10       0.4653      0.94  |Q   V    |         |         |         |      7+15       0.4719      0.95  |Q   V    |         |         |         |      7+20       0.4784      0.95  |Q    V   |         |         |         |      7+25       0.4850      0.96  |Q    V   |         |         |         |      7+30       0.4916      0.96  |Q    V   |         |         |         |      7+35       0.4983      0.97  |Q    V   |         |         |         |      7+40       0.5050      0.97  |Q    V   |         |         |         |      7+45       0.5118      0.98  |Q    V   |         |         |         |      7+50       0.5185      0.98  |Q    V   |         |         |         |      7+55       0.5253      0.99  |Q    V   |         |         |         |      8+ 0       0.5322      0.99  |Q    V   |         |         |         |      8+ 5       0.5391      1.00  |Q    V   |         |         |         |      8+10       0.5460      1.01  |Q    V   |         |         |         |      8+15       0.5530      1.01  |Q     V  |         |         |         |      8+20       0.5600      1.02  |Q     V  |         |         |         |      8+25       0.5670      1.02  |Q     V  |         |         |         |      8+30       0.5741      1.03  |Q     V  |         |         |         |      8+35       0.5813      1.04  |Q     V  |         |         |         |      8+40       0.5884      1.04  |Q     V  |         |         |         |      8+45       0.5957      1.05  |Q     V  |         |         |         |      8+50       0.6029      1.05  |Q     V  |         |         |         |      8+55       0.6102      1.06  |Q     V  |         |         |         |      9+ 0       0.6176      1.07  |Q     V  |         |         |         |      9+ 5       0.6250      1.07  |Q     V  |         |         |         |      9+10       0.6324      1.08  |Q      V |         |         |         |      9+15       0.6399      1.09  |Q      V |         |         |         |      9+20       0.6475      1.10  |Q      V |         |         |         |      9+25       0.6551      1.10  |Q      V |         |         |         |      9+30       0.6627      1.11  |Q      V |         |         |         |      9+35       0.6704      1.12  |Q      V |         |         |         |      9+40       0.6782      1.13  |Q      V |         |         |         |      9+45       0.6860      1.13  |Q      V |         |         |         |      9+50       0.6938      1.14  |Q      V |         |         |         |      9+55       0.7018      1.15  |Q      V |         |         |         |     10+ 0       0.7097      1.16  |Q      V |         |         |         |     10+ 5       0.7178      1.17  |Q       V|         |         |         |     10+10       0.7259      1.18  |Q       V|         |         |         |     10+15       0.7340      1.18  |Q       V|         |         |         |     10+20       0.7423      1.19  |Q       V|         |         |         |     10+25       0.7505      1.20  |Q       V|         |         |         |     10+30       0.7589      1.21  |Q       V|         |         |         |     10+35       0.7673      1.22  |Q       V|         |         |         |     10+40       0.7758      1.23  |Q       V|         |         |         |     10+45       0.7844      1.24  |Q       V|         |         |         |     10+50       0.7930      1.25  |Q        V         |         |         |     10+55       0.8017      1.26  |Q        V         |         |         |     11+ 0       0.8105      1.28  |Q        V         |         |         |     11+ 5       0.8193      1.29  |Q        V         |         |         |     11+10       0.8283      1.30  |Q        V         |         |         |     11+15       0.8373      1.31  |Q        V         |         |         |     11+20       0.8464      1.32  |Q        V         |         |         |     11+25       0.8556      1.33  |Q        V         |         |         |     11+30       0.8649      1.35  |Q        V         |         |         |     11+35       0.8742      1.36  |Q        |V        |         |         |     11+40       0.8837      1.37  |Q        |V        |         |         |     11+45       0.8933      1.39  |Q        |V        |         |         |     11+50       0.9029      1.40  |Q        |V        |         |         |     11+55       0.9127      1.42  |Q        |V        |         |         |     12+ 0       0.9226      1.43  |Q        |V        |         |         |     12+ 5       0.9327      1.47  |Q        |V        |         |         |     12+10       0.9437      1.60  | Q       |V        |         |         |     12+15       0.9555      1.70  | Q       | V       |         |         |     12+20       0.9674      1.74  | Q       | V       |         |         |     12+25       0.9796      1.76  | Q       | V       |         |         |     12+30       0.9919      1.78  | Q       | V       |         |         |     12+35       1.0043      1.80  | Q       | V       |         |         |     12+40       1.0168      1.82  | Q       | V       |         |         |     12+45       1.0295      1.84  | Q       |  V      |         |         |     12+50       1.0423      1.86  | Q       |  V      |         |         |     12+55       1.0553      1.88  | Q       |  V      |         |         |     13+ 0       1.0684      1.91  | Q       |  V      |         |         |     13+ 5       1.0817      1.93  | Q       |  V      |         |         |     13+10       1.0952      1.96  | Q       |  V      |         |         |     13+15       1.1088      1.98  | Q       |   V     |         |         |     13+20       1.1226      2.01  | Q       |   V     |         |         |     13+25       1.1367      2.04  | Q       |   V     |         |         |     13+30       1.1509      2.07  | Q       |   V     |         |         |     13+35       1.1653      2.10  | Q       |   V     |         |         |     13+40       1.1800      2.13  | Q       |   V     |         |         |     13+45       1.1949      2.16  | Q       |    V    |         |         |     13+50       1.2100      2.20  | Q       |    V    |         |         |     13+55       1.2254      2.23  | Q       |    V    |         |         |     14+ 0       1.2411      2.27  |  Q      |    V    |         |         |     14+ 5       1.2570      2.32  |  Q      |    V    |         |         |     14+10       1.2733      2.36  |  Q      |     V   |         |         |     14+15       1.2899      2.41  |  Q      |     V   |         |         |     14+20       1.3068      2.46  |  Q      |     V   |         |         |     14+25       1.3241      2.51  |  Q      |     V   |         |         |     14+30       1.3418      2.57  |  Q      |      V  |         |         |     14+35       1.3599      2.63  |  Q      |      V  |         |         |     14+40       1.3785      2.70  |  Q      |      V  |         |         |     14+45       1.3975      2.77  |  Q      |      V  |         |         |     14+50       1.4172      2.85  |  Q      |      V  |         |         |     14+55       1.4374      2.93  |  Q      |       V |         |         |     15+ 0       1.4582      3.03  |   Q     |       V |         |         |     15+ 5       1.4798      3.13  |   Q     |       V |         |         |     15+10       1.5022      3.25  |   Q     |        V|         |         |     15+15       1.5255      3.38  |   Q     |        V|         |         |     15+20       1.5499      3.54  |   Q     |        V|         |         |     15+25       1.5748      3.62  |   Q     |        V|         |         |     15+30       1.5980      3.37  |   Q     |         V         |         |     15+35       1.6204      3.26  |   Q     |         V         |         |     15+40       1.6445      3.50  |   Q     |         V         |         |     15+45       1.6712      3.88  |    Q    |         |V        |         |     15+50       1.7025      4.55  |     Q   |         |V        |         |     15+55       1.7416      5.67  |      Q  |         | V       |         |     16+ 0       1.7976      8.13  |         Q         | V       |         |     16+ 5       1.8988     14.70  |         |        Q|   V     |         |     16+10       2.0966     28.72  |         |         |     V   |       Q |     16+15       2.2458     21.66  |         |         |       Q |         |     16+20       2.3057      8.71  |         |Q        |        V|         |     16+25       2.3393      4.87  |     Q   |         |        V|         |     16+30       2.3654      3.79  |    Q    |         |        V|         |     16+35       2.3904      3.63  |   Q     |         |         V         |     16+40       2.4136      3.37  |   Q     |         |         V         |     16+45       2.4352      3.13  |   Q     |         |         V         |     16+50       2.4554      2.93  |  Q      |         |         |V        |     16+55       2.4744      2.77  |  Q      |         |         |V        |     17+ 0       2.4925      2.63  |  Q      |         |         |V        |     17+ 5       2.5098      2.51  |  Q      |         |         |V        |     17+10       2.5264      2.40  |  Q      |         |         | V       |     17+15       2.5423      2.31  |  Q      |         |         | V       |     17+20       2.5577      2.23  | Q       |         |         | V       |     17+25       2.5725      2.16  | Q       |         |         | V       |     17+30       2.5870      2.09  | Q       |         |         | V       |     17+35       2.6010      2.03  | Q       |         |         | V       |     17+40       2.6146      1.98  | Q       |         |         |  V      |     17+45       2.6279      1.93  | Q       |         |         |  V      |     17+50       2.6408      1.88  | Q       |         |         |  V      |     17+55       2.6535      1.84  | Q       |         |         |  V      |     18+ 0       2.6659      1.80  | Q       |         |         |  V      |     18+ 5       2.6779      1.74  | Q       |         |         |  V      |     18+10       2.6888      1.59  | Q       |         |         |   V     |     18+15       2.6989      1.47  |Q        |         |         |   V     |     18+20       2.7087      1.42  |Q        |         |         |   V     |     18+25       2.7183      1.39  |Q        |         |         |   V     |     18+30       2.7276      1.36  |Q        |         |         |   V     |     18+35       2.7368      1.33  |Q        |         |         |   V     |     18+40       2.7458      1.31  |Q        |         |         |   V     |     18+45       2.7547      1.29  |Q        |         |         |   V     |     18+50       2.7634      1.26  |Q        |         |         |    V    |     18+55       2.7719      1.24  |Q        |         |         |    V    |     19+ 0       2.7803      1.22  |Q        |         |         |    V    |     19+ 5       2.7886      1.20  |Q        |         |         |    V    |     19+10       2.7968      1.18  |Q        |         |         |    V    |     19+15       2.8048      1.17  |Q        |         |         |    V    |     19+20       2.8127      1.15  |Q        |         |         |    V    |     19+25       2.8205      1.13  |Q        |         |         |    V    |     19+30       2.8282      1.12  |Q        |         |         |    V    |     19+35       2.8358      1.10  |Q        |         |         |    V    |     19+40       2.8433      1.09  |Q        |         |         |     V   |     19+45       2.8507      1.07  |Q        |         |         |     V   |     19+50       2.8580      1.06  |Q        |         |         |     V   |     19+55       2.8652      1.05  |Q        |         |         |     V   |     20+ 0       2.8723      1.03  |Q        |         |         |     V   |     20+ 5       2.8794      1.02  |Q        |         |         |     V   |     20+10       2.8863      1.01  |Q        |         |         |     V   |     20+15       2.8932      1.00  |Q        |         |         |     V   |     20+20       2.9000      0.99  |Q        |         |         |     V   |     20+25       2.9068      0.98  |Q        |         |         |     V   |     20+30       2.9134      0.97  |Q        |         |         |     V   |     20+35       2.9200      0.96  |Q        |         |         |      V  |     20+40       2.9265      0.95  |Q        |         |         |      V  |     20+45       2.9330      0.94  |Q        |         |         |      V  |     20+50       2.9394      0.93  |Q        |         |         |      V  |     20+55       2.9457      0.92  |Q        |         |         |      V  |     21+ 0       2.9520      0.91  |Q        |         |         |      V  |     21+ 5       2.9582      0.90  |Q        |         |         |      V  |     21+10       2.9644      0.89  |Q        |         |         |      V  |     21+15       2.9705      0.89  |Q        |         |         |      V  |     21+20       2.9766      0.88  |Q        |         |         |      V  |     21+25       2.9826      0.87  |Q        |         |         |      V  |     21+30       2.9885      0.86  |Q        |         |         |      V  |     21+35       2.9944      0.86  |Q        |         |         |      V  |     21+40       3.0003      0.85  |Q        |         |         |       V |     21+45       3.0061      0.84  |Q        |         |         |       V |     21+50       3.0118      0.84  |Q        |         |         |       V |     21+55       3.0175      0.83  |Q        |         |         |       V |     22+ 0       3.0232      0.82  |Q        |         |         |       V |     22+ 5       3.0288      0.82  |Q        |         |         |       V |     22+10       3.0344      0.81  |Q        |         |         |       V |     22+15       3.0399      0.80  |Q        |         |         |       V |     22+20       3.0454      0.80  |Q        |         |         |       V |     22+25       3.0509      0.79  |Q        |         |         |       V |     22+30       3.0563      0.79  |Q        |         |         |       V |     22+35       3.0617      0.78  |Q        |         |         |       V |     22+40       3.0670      0.78  |Q        |         |         |       V |     22+45       3.0723      0.77  |Q        |         |         |       V |     22+50       3.0776      0.76  |Q        |         |         |        V|     22+55       3.0828      0.76  |Q        |         |         |        V|     23+ 0       3.0880      0.75  |Q        |         |         |        V|     23+ 5       3.0931      0.75  Q         |         |         |        V|     23+10       3.0983      0.74  Q         |         |         |        V|     23+15       3.1034      0.74  Q         |         |         |        V|     23+20       3.1084      0.73  Q         |         |         |        V|     23+25       3.1135      0.73  Q         |         |         |        V|     23+30       3.1185      0.73  Q         |         |         |        V|     23+35       3.1234      0.72  Q         |         |         |        V|     23+40       3.1284      0.72  Q         |         |         |        V|     23+45       3.1333      0.71  Q         |         |         |        V|     23+50       3.1381      0.71  Q         |         |         |        V|     23+55       3.1430      0.70  Q         |         |         |        V|     24+ 0       3.1478      0.70  Q         |         |         |        V|     24+ 5       3.1522      0.63  Q         |         |         |        V|     24+10       3.1543      0.31  Q         |         |         |        V|     24+15       3.1547      0.06  Q         |         |         |        V|     24+20       3.1548      0.01  Q         |         |         |         V  ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ APPENDIX F  HYDROGRAPH ROUTING  CALCULATION                       FLOOD HYDROGRAPH ROUTING PROGRAM             Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2018                         Study date: 12/01/22 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 6427 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ********************* HYDROGRAPH INFORMATION ********************** From study/file name: 20580duh.rte ****************************HYDROGRAPH DATA**************************** Number of intervals =   292 Time interval =    5.0 (Min.) Maximum/Peak flow rate =       28.719 (CFS) Total volume =       3.155 (Ac.Ft) Status of hydrographs being held in storage            Stream 1  Stream 2  Stream 3  Stream 4  Stream 5 Peak (CFS)      0.000     0.000     0.000     0.000     0.000 Vol (Ac.Ft)      0.000     0.000     0.000     0.000     0.000 *********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station      100.000 to Point/Station      110.000 **** RETARDING BASIN ROUTING **** ______________________________________________________________________ User entry of depth‐outflow‐storage data ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Total number of inflow hydrograph intervals = 292 Hydrograph time unit =  5.000 (Min.) Initial depth in storage basin =   0.00(Ft.) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Initial basin depth =   0.00 (Ft.) Initial basin storage =      0.00 (Ac.Ft) Initial basin outflow =   0.00 (CFS) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Depth vs. Storage and Depth vs. Discharge data:  Basin Depth  Storage    Outflow   (S‐O*dt/2)   (S+O*dt/2)      (Ft.)    (Ac.Ft)    (CFS)     (Ac.Ft)    (Ac.Ft) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐           0.000      0.000      0.000      0.000        0.000           0.500      0.003      0.001      0.003        0.003           1.000      0.008      4.810     ‐0.009        0.025           1.500      0.014     15.730     ‐0.040        0.068           2.000      0.021     20.070     ‐0.048        0.090           2.500      0.028     20.070     ‐0.041        0.097           3.000      0.035     20.070     ‐0.034        0.104           3.500      0.042     20.070     ‐0.027        0.111           4.000      0.049     20.070     ‐0.020        0.118           4.500      0.056     20.070     ‐0.013        0.125           5.000      0.063     20.070     ‐0.006        0.132           5.500      0.070     20.070      0.001        0.139           6.000      0.076     20.070      0.007        0.145           6.500      0.081     20.070      0.012        0.150 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Hydrograph Detention Basin Routing ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Graph values: 'I'= unit inflow; 'O'=outflow at time shown ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐   Time   Inflow  Outflow    Storage                                     Depth   (Hours)  (CFS)   (CFS)     (Ac.Ft) .0       7.2   14.36   21.54   28.72 (Ft.)   0.083    0.06    0.00      0.000  O       |       |       |       |     0.04   0.167    0.39    0.00      0.002  O       |       |       |       |     0.30   0.250    0.63    0.51      0.004  O       |       |       |       |     0.55   0.333    0.68    0.73      0.004  O       |       |       |       |     0.58   0.417    0.70    0.66      0.004  O       |       |       |       |     0.57   0.500    0.70    0.71      0.004  O       |       |       |       |     0.57   0.583    0.70    0.69      0.004  O       |       |       |       |     0.57   0.667    0.70    0.71      0.004  O       |       |       |       |     0.57   0.750    0.70    0.70      0.004  O       |       |       |       |     0.57   0.833    0.71    0.71      0.004  O       |       |       |       |     0.57   0.917    0.71    0.71      0.004  O       |       |       |       |     0.57   1.000    0.71    0.71      0.004  O       |       |       |       |     0.57   1.083    0.71    0.71      0.004  O       |       |       |       |     0.57   1.167    0.71    0.71      0.004  O       |       |       |       |     0.57   1.250    0.72    0.72      0.004  O       |       |       |       |     0.57   1.333    0.72    0.72      0.004  O       |       |       |       |     0.57   1.417    0.72    0.72      0.004  O       |       |       |       |     0.57   1.500    0.72    0.72      0.004  O       |       |       |       |     0.58   1.583    0.73    0.73      0.004  O       |       |       |       |     0.58   1.667    0.73    0.73      0.004  O       |       |       |       |     0.58   1.750    0.73    0.73      0.004  O       |       |       |       |     0.58   1.833    0.73    0.73      0.004  O       |       |       |       |     0.58   1.917    0.74    0.73      0.004  O       |       |       |       |     0.58   2.000    0.74    0.74      0.004  O       |       |       |       |     0.58   2.083    0.74    0.74      0.004  O       |       |       |       |     0.58   2.167    0.74    0.74      0.004  O       |       |       |       |     0.58   2.250    0.74    0.74      0.004  O       |       |       |       |     0.58   2.333    0.75    0.75      0.004  O       |       |       |       |     0.58   2.417    0.75    0.75      0.004  O       |       |       |       |     0.58   2.500    0.75    0.75      0.004  O       |       |       |       |     0.58   2.583    0.75    0.75      0.004  O       |       |       |       |     0.58   2.667    0.76    0.76      0.004  O       |       |       |       |     0.58   2.750    0.76    0.76      0.004  O       |       |       |       |     0.58   2.833    0.76    0.76      0.004  O       |       |       |       |     0.58   2.917    0.76    0.76      0.004  O       |       |       |       |     0.58   3.000    0.77    0.77      0.004  O       |       |       |       |     0.58   3.083    0.77    0.77      0.004  O       |       |       |       |     0.58   3.167    0.77    0.77      0.004  O       |       |       |       |     0.58   3.250    0.78    0.78      0.004  O       |       |       |       |     0.58   3.333    0.78    0.78      0.004  O       |       |       |       |     0.58   3.417    0.78    0.78      0.004  O       |       |       |       |     0.58   3.500    0.78    0.78      0.004  O       |       |       |       |     0.58   3.583    0.79    0.79      0.004  O       |       |       |       |     0.58   3.667    0.79    0.79      0.004  O       |       |       |       |     0.58   3.750    0.79    0.79      0.004  O       |       |       |       |     0.58   3.833    0.80    0.79      0.004  O       |       |       |       |     0.58   3.917    0.80    0.80      0.004  O       |       |       |       |     0.58   4.000    0.80    0.80      0.004  O       |       |       |       |     0.58   4.083    0.80    0.80      0.004  O       |       |       |       |     0.58   4.167    0.81    0.81      0.004  O       |       |       |       |     0.58   4.250    0.81    0.81      0.004  O       |       |       |       |     0.58   4.333    0.81    0.81      0.004  O       |       |       |       |     0.58   4.417    0.82    0.82      0.004  O       |       |       |       |     0.58   4.500    0.82    0.82      0.004  O       |       |       |       |     0.59   4.583    0.82    0.82      0.004  O       |       |       |       |     0.59   4.667    0.83    0.83      0.004  O       |       |       |       |     0.59   4.750    0.83    0.83      0.004  O       |       |       |       |     0.59   4.833    0.83    0.83      0.004  O       |       |       |       |     0.59   4.917    0.84    0.84      0.004  O       |       |       |       |     0.59   5.000    0.84    0.84      0.004  O       |       |       |       |     0.59   5.083    0.84    0.84      0.004  O       |       |       |       |     0.59   5.167    0.85    0.85      0.004  O       |       |       |       |     0.59   5.250    0.85    0.85      0.004  O       |       |       |       |     0.59   5.333    0.85    0.85      0.004  O       |       |       |       |     0.59   5.417    0.86    0.86      0.004  O       |       |       |       |     0.59   5.500    0.86    0.86      0.004  O       |       |       |       |     0.59   5.583    0.86    0.86      0.004  O       |       |       |       |     0.59   5.667    0.87    0.87      0.004  O       |       |       |       |     0.59   5.750    0.87    0.87      0.004  O       |       |       |       |     0.59   5.833    0.88    0.87      0.004  O       |       |       |       |     0.59   5.917    0.88    0.88      0.004  O       |       |       |       |     0.59   6.000    0.88    0.88      0.004  O       |       |       |       |     0.59   6.083    0.89    0.89      0.004  O       |       |       |       |     0.59   6.167    0.89    0.89      0.004  O       |       |       |       |     0.59   6.250    0.90    0.89      0.004  O       |       |       |       |     0.59   6.333    0.90    0.90      0.004  |O      |       |       |       |     0.59   6.417    0.90    0.90      0.004  |O      |       |       |       |     0.59   6.500    0.91    0.91      0.004  |O      |       |       |       |     0.59   6.583    0.91    0.91      0.004  |O      |       |       |       |     0.59   6.667    0.92    0.92      0.004  |O      |       |       |       |     0.60   6.750    0.92    0.92      0.004  |O      |       |       |       |     0.60   6.833    0.93    0.92      0.004  |O      |       |       |       |     0.60   6.917    0.93    0.93      0.004  |O      |       |       |       |     0.60   7.000    0.93    0.93      0.004  |O      |       |       |       |     0.60   7.083    0.94    0.94      0.004  |O      |       |       |       |     0.60   7.167    0.94    0.94      0.004  |O      |       |       |       |     0.60   7.250    0.95    0.95      0.004  |O      |       |       |       |     0.60   7.333    0.95    0.95      0.004  |O      |       |       |       |     0.60   7.417    0.96    0.96      0.004  |O      |       |       |       |     0.60   7.500    0.96    0.96      0.004  |O      |       |       |       |     0.60   7.583    0.97    0.97      0.004  |O      |       |       |       |     0.60   7.667    0.97    0.97      0.004  |O      |       |       |       |     0.60   7.750    0.98    0.98      0.004  |O      |       |       |       |     0.60   7.833    0.98    0.98      0.004  |O      |       |       |       |     0.60   7.917    0.99    0.99      0.004  |O      |       |       |       |     0.60   8.000    0.99    0.99      0.004  |O      |       |       |       |     0.60   8.083    1.00    1.00      0.004  |O      |       |       |       |     0.60   8.167    1.01    1.01      0.004  |O      |       |       |       |     0.60   8.250    1.01    1.01      0.004  |O      |       |       |       |     0.60   8.333    1.02    1.02      0.004  |O      |       |       |       |     0.61   8.417    1.02    1.02      0.004  |O      |       |       |       |     0.61   8.500    1.03    1.03      0.004  |O      |       |       |       |     0.61   8.583    1.04    1.03      0.004  |O      |       |       |       |     0.61   8.667    1.04    1.04      0.004  |O      |       |       |       |     0.61   8.750    1.05    1.05      0.004  |O      |       |       |       |     0.61   8.833    1.05    1.05      0.004  |O      |       |       |       |     0.61   8.917    1.06    1.06      0.004  |O      |       |       |       |     0.61   9.000    1.07    1.07      0.004  |O      |       |       |       |     0.61   9.083    1.07    1.07      0.004  |O      |       |       |       |     0.61   9.167    1.08    1.08      0.004  |O      |       |       |       |     0.61   9.250    1.09    1.09      0.004  |O      |       |       |       |     0.61   9.333    1.10    1.09      0.004  |O      |       |       |       |     0.61   9.417    1.10    1.10      0.004  |O      |       |       |       |     0.61   9.500    1.11    1.11      0.004  |O      |       |       |       |     0.62   9.583    1.12    1.12      0.004  |O      |       |       |       |     0.62   9.667    1.13    1.12      0.004  |O      |       |       |       |     0.62   9.750    1.13    1.13      0.004  |O      |       |       |       |     0.62   9.833    1.14    1.14      0.004  |O      |       |       |       |     0.62   9.917    1.15    1.15      0.004  |O      |       |       |       |     0.62  10.000    1.16    1.16      0.004  |O      |       |       |       |     0.62  10.083    1.17    1.17      0.004  |O      |       |       |       |     0.62  10.167    1.18    1.17      0.004  |O      |       |       |       |     0.62  10.250    1.18    1.18      0.004  |O      |       |       |       |     0.62  10.333    1.19    1.19      0.004  |O      |       |       |       |     0.62  10.417    1.20    1.20      0.004  |O      |       |       |       |     0.62  10.500    1.21    1.21      0.004  |O      |       |       |       |     0.63  10.583    1.22    1.22      0.004  |O      |       |       |       |     0.63  10.667    1.23    1.23      0.004  |O      |       |       |       |     0.63  10.750    1.24    1.24      0.004  |O      |       |       |       |     0.63  10.833    1.25    1.25      0.004  |O      |       |       |       |     0.63  10.917    1.26    1.26      0.004  |O      |       |       |       |     0.63  11.000    1.28    1.27      0.004  |O      |       |       |       |     0.63  11.083    1.29    1.28      0.004  |O      |       |       |       |     0.63  11.167    1.30    1.30      0.004  |O      |       |       |       |     0.63  11.250    1.31    1.31      0.004  |O      |       |       |       |     0.64  11.333    1.32    1.32      0.004  |O      |       |       |       |     0.64  11.417    1.33    1.33      0.004  |O      |       |       |       |     0.64  11.500    1.35    1.35      0.004  |O      |       |       |       |     0.64  11.583    1.36    1.36      0.004  |O      |       |       |       |     0.64  11.667    1.37    1.37      0.004  |O      |       |       |       |     0.64  11.750    1.39    1.39      0.004  |O      |       |       |       |     0.64  11.833    1.40    1.40      0.004  |O      |       |       |       |     0.65  11.917    1.42    1.42      0.004  |O      |       |       |       |     0.65  12.000    1.43    1.43      0.004  |O      |       |       |       |     0.65  12.083    1.47    1.46      0.005  |O      |       |       |       |     0.65  12.167    1.60    1.58      0.005  |O      |       |       |       |     0.66  12.250    1.70    1.69      0.005  |O      |       |       |       |     0.68  12.333    1.74    1.74      0.005  |O      |       |       |       |     0.68  12.417    1.76    1.76      0.005  |O      |       |       |       |     0.68  12.500    1.78    1.78      0.005  |O      |       |       |       |     0.68  12.583    1.80    1.80      0.005  | O     |       |       |       |     0.69  12.667    1.82    1.82      0.005  | O     |       |       |       |     0.69  12.750    1.84    1.84      0.005  | O     |       |       |       |     0.69  12.833    1.86    1.86      0.005  | O     |       |       |       |     0.69  12.917    1.88    1.88      0.005  | O     |       |       |       |     0.70  13.000    1.91    1.90      0.005  | O     |       |       |       |     0.70  13.083    1.93    1.93      0.005  | O     |       |       |       |     0.70  13.167    1.96    1.95      0.005  | O     |       |       |       |     0.70  13.250    1.98    1.98      0.005  | O     |       |       |       |     0.71  13.333    2.01    2.00      0.005  | O     |       |       |       |     0.71  13.417    2.04    2.03      0.005  | O     |       |       |       |     0.71  13.500    2.07    2.06      0.005  | O     |       |       |       |     0.71  13.583    2.10    2.09      0.005  | O     |       |       |       |     0.72  13.667    2.13    2.12      0.005  | O     |       |       |       |     0.72  13.750    2.16    2.16      0.005  | O     |       |       |       |     0.72  13.833    2.20    2.19      0.005  | O     |       |       |       |     0.73  13.917    2.23    2.23      0.005  | O     |       |       |       |     0.73  14.000    2.27    2.27      0.005  | O     |       |       |       |     0.74  14.083    2.32    2.31      0.005  | O     |       |       |       |     0.74  14.167    2.36    2.35      0.005  | O     |       |       |       |     0.74  14.250    2.41    2.40      0.005  | O     |       |       |       |     0.75  14.333    2.46    2.45      0.006  | O     |       |       |       |     0.75  14.417    2.51    2.50      0.006  | O     |       |       |       |     0.76  14.500    2.57    2.56      0.006  | O     |       |       |       |     0.77  14.583    2.63    2.62      0.006  | O     |       |       |       |     0.77  14.667    2.70    2.69      0.006  | OI    |       |       |       |     0.78  14.750    2.77    2.76      0.006  |  O    |       |       |       |     0.79  14.833    2.85    2.84      0.006  |  O    |       |       |       |     0.79  14.917    2.93    2.92      0.006  |  O    |       |       |       |     0.80  15.000    3.03    3.01      0.006  |  O    |       |       |       |     0.81  15.083    3.13    3.12      0.006  |  O    |       |       |       |     0.82  15.167    3.25    3.23      0.006  |  O    |       |       |       |     0.84  15.250    3.38    3.36      0.006  |  O    |       |       |       |     0.85  15.333    3.54    3.51      0.007  |  O    |       |       |       |     0.87  15.417    3.62    3.61      0.007  |   O   |       |       |       |     0.88  15.500    3.37    3.43      0.007  |  O    |       |       |       |     0.86  15.583    3.26    3.25      0.006  |  O    |       |       |       |     0.84  15.667    3.50    3.45      0.007  |  O    |       |       |       |     0.86  15.750    3.88    3.82      0.007  |   O   |       |       |       |     0.90  15.833    4.55    4.42      0.008  |   OI  |       |       |       |     0.96  15.917    5.67    5.56      0.008  |     O |       |       |       |     1.03  16.000    8.13    7.87      0.010  |       OI      |       |       |     1.14  16.083   14.70   13.98      0.013  |       |      OI       |       |     1.42  16.167   28.72   20.07      0.045  |       |       |     O |       I     3.74  16.250   21.66   20.07      0.081  |       |       |     O I       |     6.45  16.333    8.71   20.07      0.047  |       |I      |     O |       |     3.85  16.417    4.87    4.80      0.008  |    O  |       |       |       |     1.00  16.500    3.79    4.08      0.007  |   O   |       |       |       |     0.92  16.583    3.63    3.51      0.007  |  OI   |       |       |       |     0.87  16.667    3.37    3.49      0.007  |  O    |       |       |       |     0.86  16.750    3.13    3.12      0.006  |  O    |       |       |       |     0.82  16.833    2.93    2.99      0.006  |  O    |       |       |       |     0.81  16.917    2.77    2.78      0.006  |  O    |       |       |       |     0.79  17.000    2.63    2.65      0.006  | O     |       |       |       |     0.78  17.083    2.51    2.52      0.006  | O     |       |       |       |     0.76  17.167    2.40    2.42      0.006  | O     |       |       |       |     0.75  17.250    2.31    2.33      0.005  | O     |       |       |       |     0.74  17.333    2.23    2.24      0.005  | O     |       |       |       |     0.73  17.417    2.16    2.17      0.005  | O     |       |       |       |     0.73  17.500    2.09    2.10      0.005  | O     |       |       |       |     0.72  17.583    2.03    2.04      0.005  | O     |       |       |       |     0.71  17.667    1.98    1.99      0.005  | O     |       |       |       |     0.71  17.750    1.93    1.94      0.005  | O     |       |       |       |     0.70  17.833    1.88    1.89      0.005  | O     |       |       |       |     0.70  17.917    1.84    1.85      0.005  | O     |       |       |       |     0.69  18.000    1.80    1.80      0.005  | O     |       |       |       |     0.69  18.083    1.74    1.75      0.005  |O      |       |       |       |     0.68  18.167    1.59    1.62      0.005  |O      |       |       |       |     0.67  18.250    1.47    1.48      0.005  |O      |       |       |       |     0.65  18.333    1.42    1.43      0.004  |O      |       |       |       |     0.65  18.417    1.39    1.39      0.004  |O      |       |       |       |     0.64  18.500    1.36    1.36      0.004  |O      |       |       |       |     0.64  18.583    1.33    1.34      0.004  |O      |       |       |       |     0.64  18.667    1.31    1.31      0.004  |O      |       |       |       |     0.64  18.750    1.29    1.29      0.004  |O      |       |       |       |     0.63  18.833    1.26    1.27      0.004  |O      |       |       |       |     0.63  18.917    1.24    1.24      0.004  |O      |       |       |       |     0.63  19.000    1.22    1.22      0.004  |O      |       |       |       |     0.63  19.083    1.20    1.21      0.004  |O      |       |       |       |     0.63  19.167    1.18    1.19      0.004  |O      |       |       |       |     0.62  19.250    1.17    1.17      0.004  |O      |       |       |       |     0.62  19.333    1.15    1.15      0.004  |O      |       |       |       |     0.62  19.417    1.13    1.14      0.004  |O      |       |       |       |     0.62  19.500    1.12    1.12      0.004  |O      |       |       |       |     0.62  19.583    1.10    1.10      0.004  |O      |       |       |       |     0.61  19.667    1.09    1.09      0.004  |O      |       |       |       |     0.61  19.750    1.07    1.08      0.004  |O      |       |       |       |     0.61  19.833    1.06    1.06      0.004  |O      |       |       |       |     0.61  19.917    1.05    1.05      0.004  |O      |       |       |       |     0.61  20.000    1.03    1.04      0.004  |O      |       |       |       |     0.61  20.083    1.02    1.02      0.004  |O      |       |       |       |     0.61  20.167    1.01    1.01      0.004  |O      |       |       |       |     0.61  20.250    1.00    1.00      0.004  |O      |       |       |       |     0.60  20.333    0.99    0.99      0.004  |O      |       |       |       |     0.60  20.417    0.98    0.98      0.004  |O      |       |       |       |     0.60  20.500    0.97    0.97      0.004  |O      |       |       |       |     0.60  20.583    0.96    0.96      0.004  |O      |       |       |       |     0.60  20.667    0.95    0.95      0.004  |O      |       |       |       |     0.60  20.750    0.94    0.94      0.004  |O      |       |       |       |     0.60  20.833    0.93    0.93      0.004  |O      |       |       |       |     0.60  20.917    0.92    0.92      0.004  |O      |       |       |       |     0.60  21.000    0.91    0.91      0.004  |O      |       |       |       |     0.59  21.083    0.90    0.90      0.004  |O      |       |       |       |     0.59  21.167    0.89    0.90      0.004  O       |       |       |       |     0.59  21.250    0.89    0.89      0.004  O       |       |       |       |     0.59  21.333    0.88    0.88      0.004  O       |       |       |       |     0.59  21.417    0.87    0.87      0.004  O       |       |       |       |     0.59  21.500    0.86    0.86      0.004  O       |       |       |       |     0.59  21.583    0.86    0.86      0.004  O       |       |       |       |     0.59  21.667    0.85    0.85      0.004  O       |       |       |       |     0.59  21.750    0.84    0.84      0.004  O       |       |       |       |     0.59  21.833    0.84    0.84      0.004  O       |       |       |       |     0.59  21.917    0.83    0.83      0.004  O       |       |       |       |     0.59  22.000    0.82    0.82      0.004  O       |       |       |       |     0.59  22.083    0.82    0.82      0.004  O       |       |       |       |     0.58  22.167    0.81    0.81      0.004  O       |       |       |       |     0.58  22.250    0.80    0.80      0.004  O       |       |       |       |     0.58  22.333    0.80    0.80      0.004  O       |       |       |       |     0.58  22.417    0.79    0.79      0.004  O       |       |       |       |     0.58  22.500    0.79    0.79      0.004  O       |       |       |       |     0.58  22.583    0.78    0.78      0.004  O       |       |       |       |     0.58  22.667    0.78    0.78      0.004  O       |       |       |       |     0.58  22.750    0.77    0.77      0.004  O       |       |       |       |     0.58  22.833    0.76    0.77      0.004  O       |       |       |       |     0.58  22.917    0.76    0.76      0.004  O       |       |       |       |     0.58  23.000    0.75    0.76      0.004  O       |       |       |       |     0.58  23.083    0.75    0.75      0.004  O       |       |       |       |     0.58  23.167    0.74    0.75      0.004  O       |       |       |       |     0.58  23.250    0.74    0.74      0.004  O       |       |       |       |     0.58  23.333    0.73    0.74      0.004  O       |       |       |       |     0.58  23.417    0.73    0.73      0.004  O       |       |       |       |     0.58  23.500    0.73    0.73      0.004  O       |       |       |       |     0.58  23.583    0.72    0.72      0.004  O       |       |       |       |     0.57  23.667    0.72    0.72      0.004  O       |       |       |       |     0.57  23.750    0.71    0.71      0.004  O       |       |       |       |     0.57  23.833    0.71    0.71      0.004  O       |       |       |       |     0.57  23.917    0.70    0.70      0.004  O       |       |       |       |     0.57  24.000    0.70    0.70      0.004  O       |       |       |       |     0.57  24.083    0.63    0.65      0.004  O       |       |       |       |     0.57  24.167    0.31    0.37      0.003  O       |       |       |       |     0.54  24.250    0.06    0.08      0.003  O       |       |       |       |     0.51  24.333    0.01    0.01      0.003  O       |       |       |       |     0.50  24.417    0.00    0.00      0.003  O       |       |       |       |     0.50  24.500    0.00    0.00      0.003  O       |       |       |       |     0.50 Remaining water in basin =    0.00 (Ac.Ft) ****************************HYDROGRAPH DATA**************************** Number of intervals =   294 Time interval =    5.0 (Min.) Maximum/Peak flow rate =       20.070 (CFS) Total volume =       3.152 (Ac.Ft) Status of hydrographs being held in storage            Stream 1  Stream 2  Stream 3  Stream 4  Stream 5 Peak (CFS)      0.000     0.000     0.000     0.000     0.000 Vol (Ac.Ft)      0.000     0.000     0.000     0.000     0.000 *********************************************************************** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Project Description Friction Method Manning Formula Solve For Discharge Input Data Roughness Coefficient 0.013 Channel Slope 0.03650 ft/ft Normal Depth 0.50 ft Diameter 1.50 ft Discharge 4.81 ft³/s Cross Section Image 18" Outlet @d=0.5' 12/15/2022 12:04:25 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Full Flow Capacity Input Data Roughness Coefficient 0.013 Channel Slope 0.03650 ft/ft Normal Depth 1.50 ft Diameter 1.50 ft Discharge 20.07 ft³/s Results Discharge 20.07 ft³/s Normal Depth 1.50 ft Flow Area 1.77 ft² Wetted Perimeter 4.71 ft Hydraulic Radius 0.38 ft Top Width 0.00 ft Critical Depth 1.47 ft Percent Full 100.0 % Critical Slope 0.03259 ft/ft Velocity 11.36 ft/s Velocity Head 2.00 ft Specific Energy 3.50 ft Froude Number 0.00 Maximum Discharge 21.59 ft³/s Discharge Full 20.07 ft³/s Slope Full 0.03650 ft/ft Flow Type SubCritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Average End Depth Over Rise 0.00 % 18" Outlet @full 12/15/2022 1:40:00 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page GVF Output Data Normal Depth Over Rise 100.00 % Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.50 ft Critical Depth 1.47 ft Channel Slope 0.03650 ft/ft Critical Slope 0.03259 ft/ft 18" Outlet @full 12/15/2022 1:40:00 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Discharge Input Data Roughness Coefficient 0.013 Channel Slope 0.03650 ft/ft Normal Depth 1.00 ft Diameter 1.50 ft Discharge 15.73 ft³/s Cross Section Image 18" Outlet @d=1' 12/15/2022 1:39:04 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page APPENDIX G  SOIL REPORT EXCERPTS  6634 Valjean Avenue, Van Nuys, California 91406 Phone: (818) 785-2158 Fax: (818) 785-1548 MDN 23013A GEOLOGIC AND GEOTECHNICAL ENGINEERING INVESTIGATION REPORT, PROPOSED SFD RESIDENTIAL DEVELOPMENT, North Corner of Chase Road & Aria Lane, Fontana, California for Ridge Crest Real Estate, LLC July 19, 2022 W.O. 7726 (Revised July 28, 2022) 6634 Valjean Avenue, Van Nuys, California 91406 Phone: (818) 785-2158 Fax: (818) 785-1548 MDN 23013A July 19, 2022 W.O. 7726 (Revised July 28, 2022) RIDGE CREST REAL ESTATE, LLC 353 E. Angeleno Avenue A, Burbank, California 91502 Attention: Mr. Timothy Sales Subject: Geologic and Geotechnical Engineering Investigation Report, Proposed SFD Residential Development, North Corner of Chase Road & Aria Lane, Fontana, California As requested, GeoSoils Consultants, Inc. (GSC) has performed a geologic and geotechnical engineering investigation on the subject tract. The purpose of this investigation is to provide geologic and geotechnical engineering recommendations for site grading and foundations. The report presents the results of our research, subsurface exploration, laboratory testing, site reconnaissance, and provides geotechnical engineering recommendations for site grading. Grading of the site is considered feasible from a geologic and geotechnical engineering prospective, provided the recommendations presented herein are incorporated into the design and implemented during grading. We appreciate this opportunity to be of service to you. If you have any questions regarding this report, or if we may be of further assistance to you, please do not hesitate to contact us. Very truly yours, GEOSOILS CONSULTANTS, INC. MAHAN PASDARPOUR RUDY F. RUBERTI PE 90111 CEG 1708 cc: (1) Addressee Page 25 July 19, 2022 W.O. 7726 (Revised July 28, 2022) MDN 23013A TABLE 5 PERCOLATION TEST RESULTS Test Location Percolation Depth (ft) Pre-Adjusted Rate (inch/hour) * B-6 10-15 15.24 B-7 20-30 2.29 B-8/P-1 30-40 2.62 B-9/P-2 40-50 11.73 *Reduction factor should be applied by the Civil Engineer of The Record It is our professional opinion that on-site infiltration will not be a hazard to the potential development and the site is suitable for storm water infiltration. The proposed infiltration rates were calculated in inches per hour and are without factor of safety. Per our discussion with the civil engineer of the record, Mr. Anthony Ng from United Civil Inc, it is our understanding that the civil engineer will apply an appropriate factor of safety to these infiltration rates to calculate dry wells design percolation rates. 6.6 Corrosion Characteristics of Soil As a screening level study, limited chemical and electrical tests were performed on samples considered representative of the onsite soils to identify potential corrosive characteristics of these soils. The common indicators that are generally associated with soil corrosivity, among other indicators, include water-soluble sulfate (a measure of soil corrosivity on concrete), water-soluble chloride (a measure of soil corrosivity on metals embedded in concrete), pH (a measure of soil acidity), and minimum electrical resistivity (a measure of corrosivity on metals embedded in soils). Test methodology and results are presented in Appendix B. It should be noted that GeoSoils does not practice corrosion engineering; therefore, the test results, opinion and engineering judgment provided herein should be considered as general guidelines only. Additional analyses, and/or determination of other indicators, would be warranted, especially, for cases where buried metallic building materials (such as copper and cast or ductile iron pipes) in contact with site B-3B-7 B-1B-5 B-6 B-4 B-8/P-1 B-9/P-2 B-2 B-3B-7 B-6 B-4 B-8/P-1 B-9/P-2 EXPLANATION APPROXIMATE LOCATION OF BORINGB-7 WORK ORDER DATE SCALE REVISED PLATE 1 6634 Valjean Avenue Van Nuys, CA 91406 GEOTECHNICAL GEOLOGIC ENVIRONMENTAL GeoSoils Consultants Inc.GSC 7726 7/2022 1" = 30' PROPOSED RESIDENTIAL DEVELOPMENT NORTH CORNER OF CHASE ROAD & ARIA LANE FONTANA, CALIFORNIA RIDGECREST REAL ESTATE, LLC. MDN 23013A P-2 APPROXIMATE LOCATION OF PERCOLATION TEST X: \ 2 0 0 1 w . o \ g s c - c a d \ 7 7 2 6 \ 5 - 9 - 2 2 \ C U R R E N T \ P l a t e 1 . d w g , 7 / 2 8 / 2 0 2 2 3 : 1 7 : 4 4 P M , A u t o C A D P D F ( H i g h Q u a l i t y P r i n t ) . p c 3 APPENDIX H  DESIGN CAPTURE VOLUME (DCV)  CALCULATION  Water Quality Management Plan (WQMP)  4‐8  4.2 Project Performance Criteria  The purpose of this section of the Project WQMP is to establish targets for post‐development hydrology based on  performance criteria specified in the MS4 Permit. These targets include runoff volume for water quality control  (referred to as LID design capture volume), and runoff volume, time of concentration, and peak runoff for  protection of any downstream waterbody segments with a HCOC. If the project has more than one  outlet for stormwater runoff, then complete additional versions of these forms for each  DA / outlet.  Methods applied in the following forms include:  For LID BMP Design Capture Volume (DCV), the San Bernardino County Stormwater Program requires use of the P6 method (MS4 Permit Section XI.D.6a.ii) – Form 4.2‐1 For HCOC pre‐ and post‐development hydrologic calculation, the San Bernardino County Stormwater Program requires the use of the Rational Method (San Bernardino County Hydrology Manual Section D). Forms 4.2‐2 through Form 4.2‐5 calculate hydrologic variables including runoff volume, time of concentration, and peak runoff from the project site pre‐ and post‐development using the Hydrology Manual Rational Method approach. For projects greater than 640 acres (1.0 mi2), the Rational Method and these forms should not be used. For such projects, the Unit Hydrograph Method (San Bernardino County Hydrology Manual Section E) shall be applied for hydrologic calculations for HCOC performance criteria. Refer to Section 4 in the TGD for WQMP for detailed guidance and instructions.  Form 4.2‐1  LID BMP Performance Criteria for Design Capture Volume  (DA 1)  1 Project area DA 1 (ft2): 297,939  2 Imperviousness after applying preventative site design practices (Imp%): 65  3 Runoff Coefficient (Rc):  _0.339  Rc = 0.858(Imp%)^3‐0.78(Imp%)^2+0.774(Imp%)+0.04  4 Determine 1‐hour rainfall depth for a 2‐year return period P2yr‐1hr (in):  0.655   http://hdsc.nws.noaa.gov/hdsc/pfds/sa/sca_pfds.html  5 Compute P6, Mean 6‐hr Precipitation (inches):  0.97 P6 = Item 4 *C1, where C1 is a function of site climatic region specified in Form 3‐1 Item 1 (Valley = 1.4807; Mountain = 1.909; Desert = 1.2371)   6 Drawdown Rate   Use 48 hours as the default condition. Selection and use of the 24 hour drawdown time condition is subject to approval  by the local jurisdiction. The necessary BMP footprint is a function of drawdown time. While shorter drawdown times  reduce the performance criteria for LID BMP design capture volume, the depth of water that can be stored is also  reduced.  24‐hrs  48‐hrs  7 Compute design capture volume, DCV (ft3):  21,232  DCV = 1/12 * [Item 1* Item 3 *Item 5 * C2], where C2 is a function of drawdown rate (24‐hr  = 1.582; 48‐hr = 1.963)   Compute separate DCV for each outlet from the project site per schematic drawn in Form 3‐1 Item 2  L= 8 3 7 ' A A = 6.84 AC Q = 14.84 CFS NOT A PART NOT A PART NOT A PART NOT A PART 100 PL PL PL PL IN THE CITY OF FONTANA, STATE OF CALIFORNIA EXISTING HYDROLOGY MAP TRACT NO. 20580 L=573' B A Q100 TRACT 20580 FONTANA, CA PREPARED BY: UNITED CIVIL, INC. 30141 AGOURA ROAD, SUITE 215 AGOURA HILLS, CA 91301 PH: (818) 707-8648 FAX: (818) 707-8649 RC HOMES, INC. DEVELOPER/APPLICANT:DRAINAGE MAP RIDGE CREST REAL ESTATE, LLC LOS ANGELES, CA 90004 550 N LARCHMONT BLVD., SUITE 201 PRE DEVELOPED CONDITION TEL: (323) 450-2334 Site NO S C A L E VICINITY MAP ONT A R I O F W Y FOOTHILL FWY W FOOTHILL BLVD SI E R R A A V E SAN BERNARDINO FWY BASELINE AVE SD SD SD SD SD SD SD SD SD SD SD SD SD SD D D D A A = 3.43 AC Q = 13.74 CFS B A = 1.79 AC Q = 8.46 CFS C A = 1.62 AC Q = 7.96 CFS 100 100 100 PL PL PL PL TRENCH W/ 72" DIAM. PROP. DETENTION CASCADE DRIVE "A " D R I V E "B " D R I V E "D " D R I V E "C" DRIVE CMP PIPE (94'X8'X7') TRENCH W/ 84" DIAM. PROP. INFILTRATION PERFORATED CMP PIPE (79'X39'X8') Q100 (ALLOWABLE)=20.07 CFS Q100 (DESIGN)=20.07 CFS IN THE CITY OF FONTANA, STATE OF CALIFORNIA PROPOSED HYDROLOGY MAP TRACT NO. 20580 TRACT 20580 FONTANA, CA PREPARED BY: UNITED CIVIL, INC. 30141 AGOURA ROAD, SUITE 215 AGOURA HILLS, CA 91301 PH: (818) 707-8648 FAX: (818) 707-8649 RC HOMES, INC. DEVELOPER/APPLICANT:DRAINAGE MAP RIDGE CREST REAL ESTATE, LLC LOS ANGELES, CA 90004 550 N LARCHMONT BLVD., SUITE 201 POST DEVELOPED CONDITION TEL: (323) 450-2334 B A Q100 Site NO S C A L E VICINITY MAP ONT A R I O F W Y FOOTHILL FWY W FOOTHILL BLVD SI E R R A A V E SAN BERNARDINO FWY BASELINE AVE UNDERGROUND INFILTRATION SYSTEM - TRENCH WITH 84" DIAMETER PERFORATED PIPE APPENDIX H  HYDROLOGY MAPS  Tract No. 20580 Fontana, CA