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HAY 24 '91 09:_21AM 'J_CO.COh 1-1L11 IITY_DEV. P.-1/4t <br /> FORMULAS FCR CALCULATION OF A <br /> STORM DRAIN POND I S VOLUME <br /> BASIC RUNOFF COEFFICIENTS <br /> SURFACE COEFFICJENT <br /> POND or BASIN 1. 00 <br /> -2 COV 3 8 a co 0. 95 <br /> PAVING (concrete ) asp <br /> oiled surface ) <br /> BUILDING or ROOF . . . . • 0. 80 <br /> COMPACTED' EARTH ( gravel ) . 0.75 <br /> LAWN or - LANDSCAPING •• 0.20 <br /> RUNOFF CALCULATED AT 3.121 ( 0.26 ' <br /> ( a 10-year . 4e - hour 5form <br /> Fes(; <br /> M U L ^S <br /> .r'`• ,�`+ .yam► `da- ��-2- G�+. <br /> 5" P <br /> 810. x t _ oo <br /> PAYING = O 500 x loo7S <br /> 13 ICo o_ e� _ C) _::I_ - 'Z 7q <br /> - moor Y <br /> i_ -•.v 73 ?:3-3 <br /> r� c. •- �.L V n V.�C i <br /> LANDSCAPE SUBTOTAL <br /> * THE NEEDED POND CAPACITY = SU1 TOTAL X 2 a 41170 <br /> ( VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION .) <br /> 74-9 <br />