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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 /> COMPACTED EARTH (gravel).....................................................................................0.75 <br /> LAWNor LANDSCAPING.............................................................................................0.20 <br /> RUNOFF (feet) <br /> ZONE RURAL URBAN <br /> ZONE #1 ........................................................... .27' ........................ .32' <br /> ' ........................ . ' <br /> ZONE #3 ........................................................... .12' ........................ .16' <br /> FORMULAS <br /> SURFACE AREA (S.F.) COEFFICIENT RUNOFF CU. FT. NEEDED <br /> POND BASIN X 1.00 X <br /> PAVING G�O X 0.95 X <br /> ROOF �DU X 0.80 X _ Z '2 <br /> COMP. EARTH X 0.75 X <br /> LAWN & X 0.20 X <br /> LANDSCAPE l ' I <br /> SUBTOTAL <br /> THE NEEDED POND CAPACITY = SUBTOTAL X 2 <br /> CU. FT. i 30, Sri <br /> (VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION) <br />