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�V FORMULA FOR CALCULATION OF A <br /> oc �tiN 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 /> COMPACTED EARTH (gravel).....................................................................................0.75 <br /> LAWNor LANDSCAPING.............................................................................................0.20 <br /> RUNOFF (feet) <br /> ZONE RURAL URBAN <br /> ZONE #1 ........................................................... .27' ........................ .32' <br /> ZONE #2 ' ........................ . ' <br /> ZONE #3 ' ........................ .16, <br /> FORMULAS <br /> SURFACE AREA (S.F.) COEFFICIENT RUNOFF CU. FT. NEEDED <br /> POND BASIN J X 1.00 X = <br /> PAVING X 0.95 X <br /> ROOF ----L X 0.80 X <br /> COMP. EARTH X 0.75 X = <br /> LAWN & X 0.20 X = <br /> LANDSCAPE <br /> SUBTOTAL <br /> THE NEEDED POND CAPACITY = SUBTOTAL X 2 = <br /> 11 q 60 CU. FT. <br /> (VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION) <br />