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FORMULA FOR CALCULATION JF 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 ....................................... 0.27'.....................................0.32' <br /> ZONE #2....................................... 0.20'.....................................0.25' <br /> ZONE #3....................................... 0.12'.....................................0.16' <br /> FORMULAS <br /> SURFACE AREA (S.F.) COEFFICIENT RUNOFF CU. FT. NEEDED <br /> POND BASIN 461 060 X 1.00 X •2a = 81 oGb. <br /> PAVING I-19,345 X 0.95 X X20 = 34167&. <br /> ROOF 6rtllql X 0.80 X 20 = )Sj <br /> COMP-EARTH X 0.75 X _ <br /> LAWN & 2A x 0.20 x <br /> LANDSCAPE <br /> SUBTOTAL <br /> THE NEEDED POND CAPACITY = SUBTOTAL X 2 <br /> 35, 16 2 - 4C>) v,->c> _ 3, 5& 1 '/'&' I-H <br /> (VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION) <br />