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FORMULA " FOR CALCULX_10N OF A <br /> STORM DRAIN POND'S VOLUME' <br /> BASIC RUNOFF COEFFICIENTS <br /> SURFACE COEFFICIENT <br /> POND or BASIN 1. 00 <br /> +'f+Vltvu (%.V11C1iilr. , usphuii , oiled surf acb <br /> BUILDING or ROOF 0.80 <br /> COMPACTED' EARTH ( gravel ) . . . . . . . . . . 0,75 <br /> LAWN or LANDSCAPING - . 0.20 <br /> Q�,pFESSIp,,� <br /> RUNOFF CALCULATED AT 3. 12" ( 0-26 ' ) `� oe� �' scyg4e <br /> ( a 10-year , 48 - hour storm ) No. 32153 T! <br /> Exp.12-31.96 ' <br /> C it <br /> 6'0F A 2 <br /> FORMULAS <br /> 0 <br /> POND BASIN = P_&4-4 /3 x 1 . 00 x 0.26 = 7 <br /> PAVING II /2,�, &-�4 x 0. 95 x 0.26 32 0 3 d <br /> ROOF = 8280 x 0. 80 x 0.26 = /7ZZ <br /> COMP. EARTH = 4 05;,, 5le-z, x 0. 75 x 0.26 o <br /> LAWN a - o x 0.20 x 0.26 zsz <br /> LANDSCAPE SUBTOTAL = so S <br /> THE NEEDED POND CAPACITY = SUBTOTAL X 2 <br /> VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION . ) <br /> cUniNA-DRA"CING , TDdG.— _ SCHACK & COMPANY, INC. <br /> AA N T�C A I e-4 - Professional Design Group <br /> 1025 Central Ave. P.O. Box 339 <br /> Tracy, CA 95378 <br />