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. FORMULA FOR CALCULATION OF A <br /> STORM DRAIN POND'S VOLUME <br /> BASIC RUNOFF COEFFICIENTS <br /> SURFACE COEFFICIENT <br /> PONDor BASIN............................................................................................................1.00 <br /> PAVING (concrete, asphalt, oiled surface).................................................................0.95 <br /> BUILDINGor ROOF......................................................................................................0.80 <br /> COMPACTEDEARTH (gravel).....................................................................................0.75 <br /> LAWNor LANDSCAPING.............................................................................................0.20 <br /> RUNOFF (feet) <br /> ZONE RURAL URBAN <br /> ZONE #1 ........................................................... .27' ........................ .32' <br /> ZONE #2 ........................................................... .20' ........................ .25' <br /> ZONE #312' ........................ .16' <br /> ........................................................... . <br /> FORMULAS <br /> SURFACE AREA (S.F.) COEFFICIENT RUNOFF CU. FT. NEEDED . <br /> POND BASIN �d X 1.00 X 27 = �b <br /> PAVING (P2�O X 0.95 X <br /> ROOF 2 2- X 0.80 X '27 = �� <br /> COMP. EARTH - t Iso X 0.75 X 21 = �,7Z <br /> LAWN & 5� X 0.20 x ' = 24 <br /> LANDSCAPE I l <br /> SUBTOTAL = <br /> THE NEEDED POND CAPACITY = SUBTOTAL X 2 = 2Z, 2-6Z <br /> 22 282 11 CU. FT. <br /> (VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION) <br />