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FORMULA FOR CALCULATION OF A <br /> STORM DRAIN POND'S VOLUME <br /> -!:)L: - `-) 3 - 22 Z IP- 93 - <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 #3 ........................................................... .12' ........................ .16' <br /> FORMULAS <br /> SURFACE AREA (S.F.) COEFFICIENT RUNOFF CU. FT. NEEDED <br /> POND BASIN 2(o 2 X 1.00 X <br /> PAVING 9 T6D X 0.95 X <br /> ROOF ��272 X 0.80 X ,2'I = r),4 <br /> COMP. EARTH X 0.75 X L� _ <br /> LAWN & X 0.20 X <br /> LANDSCAPE <br /> SUBTOTAL = �� 99 <br /> THE NEEDED POND CAPACITY = SUBTOTAL X 2 = 79 B 2- <br /> 2- <br /> 2 CU. FT. <br /> (VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION) <br />