Laserfiche WebLink
r0 , <br /># 0 <br />WILLIA.M ULRICH DRAINAGE CALCULATIONS <br />A. Drainage Area of pond before construction: 6.62 acres <br />Drainage Area of pond after construction: 7.86 acres - 342,381. sq. ft. <br />I. Lginal Runoff 100 year storm Tc - 5 <br />minutes <br />-uefore - 0.35 <br />Qbefor^ - CiA - (0.35)(9.3)(6.62) - 21.5 <br />CFS <br />':. New Runoff Factor into Pond: <br />Additional Driveway: 260 sq. ft. x 0.90 - <br />2412 <br />Additional House Rocf: 4284 sq. ft. x 1.00 <br />- 4284 <br />Additional Concrete Apron 6 Sidewalk: 185 <br />sq. ft. x 1.00 - <br />185 <br />Remaining Area: 335,233 x 0.35 - 117,332 <br />342,382 x 0.36 - 124,213 <br />III. Nod kut - (0.36)(9.3)(7.86) - 26.3 <br />CFS <br />Ili. Stage -• Storage Table: <br />ELEV; WATER LEVEL !FT) AREA (FT2) <br />..4c. 'FT3) <br />ACCUM VOL (FT3) <br />930.0 0 23,288 <br />U <br />931.0 1.0 30,048 <br />26668 <br />, <br />26,668 <br />932.0 2.0 36,420 <br />33,234 <br />59,902 <br />933 n 3.0 46,228 <br />41,324 <br />101,226 <br />V. Stage - Discharge Table: Existing 12" <br />C.M.P. wits: inlet control <br />'LEV WATER M-El. (FT) Nor/D 0 (CFS) <br />930.0 0 0 0 <br />431.0 1 1 1.6 <br />9:2.0 2 .. 2.8 <br />933.0 13 3.4 <br />