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04-21-1986 Planning Packet
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04-21-1986 Planning Packet
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1/17/2024 11:15:18 AM
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\ <br />WILLIAM ULRICH DRAINAGE CALCULATIONS <br />Drainage Area of pond before constructiont 6>62 acres <br />Drainage Area of pond after constructions 7.86 acres ■ 342,382 sq. ft. <br />m <br />I. Original Runoff 100 year storm Tc - 5 minutes <br />Cbefore ■ 0.35 <br />Qbefore - CiA - (0.35)(9.3)(6.62) - 21.5 CFS <br />II. New Runcff Factor into Pond: <br />Additional Driveway: 2680 sq. ft. x 0.90 - 2412 <br />Additional House Roof: 4284 sq. ft. x 1.00 “ 4284 <br />Additional Concrete Apron & Sidewalk: 185 sq. ft. x 1.00 « 185 <br />Remaining Area: 335,233 x 0.35 ■ 117,332 <br />342,382 X 0.36 - 124,213 <br />III. New Runoff: • (0.36)(9.3)(7.86) ■ 26.3 CFS <br />IV. Stage - Storage Table: <br />ELEV <br />930.0 <br />931.0 <br />932.0 <br />933.0 <br />WATER LEVEL (FT) AREA (FT2) INC. VOL (FT3) ACCUM VOL (FT3) <br />23,288 <br />30,048 <br />36.420 <br />46,228 <br />26,668 <br />33,234 <br />41,324 <br />0 <br />26,668 <br />59,902 <br />101,226 <br />V. Stage - Discharge Table: Existing 12" C.M.P. with inlet control <br />ELEV WATER LEVEL (FT)HW/D Q (CFS) <br />930.0 <br />931.0 <br />932.0 <br />933.0 <br />■1-
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