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SOUTHWINDS CHURCH <br /> STORM DRAINAGE POND VOLUME CALCULATION <br /> BASIC RUNOFF COEFFICIENTS <br /> SURFACE COEFFICIENT <br /> Pondor Basin .............................................................................. 1.00 <br /> Paving ...................................................................................... 0.95 <br /> Building or Roof ........................................................................... 0.80 <br /> Compacted Earth (gravel) .............................................................. 0.75 <br /> Lawn or Landscaping ................................................................... 0.20 <br /> RUNOFF (inches) <br /> ZONERURA URBAN <br /> Zone # 1 .................. ..... . " ...... ......... ... .I...... 3.89„ <br /> Zone # 2 ....................... 2.40.. .......................... 3.03„ <br /> Zone # ....................... 1.39" ......................... 1.87" <br /> DRAINAGE BASIN SIZE CALCULATION <br /> SURFACE AREA (S.F.) COEFFICIENT RUNOFF C.U. FT. REQ. <br /> Pond or Basin 122,807 x 1.00 x .116' = 14,245.6 <br /> Paving 304,088 x 0.95 x .116' = 33,510.5 <br /> Building or Roof 65,000 x 0.80 x .116' = 6,032.0 <br /> Comp. Earth 123,046 x 0.75 x .116' = 10,705.0 <br /> Lawn or 121,223 x 0.20 x .116' = 2,812.4 <br /> f Landscaping <br /> SUBTOTAL = 67,305.5 <br /> REQ POND CAPACITY = SUBTOTAL x 2 = 67,305.5 x2 = 134,611 CU. FT. <br />