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FORMULAS FOR CALCULATION OF . A <br /> STORM DRAIN POND 'S VOLUME <br /> ` BASIC RUN-OFF COEFFICIENTS <br /> SURFACE COEFFICIENT . <br /> POND or BASIN 1. 00 <br /> '.4ViNG (concrete , asphalt, oiled surface ) 0.95 <br /> c n� <br /> BUILDING- or ROOF 0.80 ao <br /> COMPACTED EARTH { Qravel ) , 0.75 <br /> LAWN or LANDSCAPING .. 0,20 . <br /> RUNOFF CALCULATED AT 3.12 ( 0.26 <br /> i ( a 10-year , 48- hour sform ) �Q ; <br /> No 5312 <br /> FORMULAS <br /> �JF*c AQP gp• o�k� v��� 0 t�` . rf.� I <br />{ � �n POND EASIN = 15- yob x . oo x o.2;� <br /> PAV ING . =_/q� Xpx 0. x 0.26 _ 3 3 <br /> ROOF =. x 0. 80 x 0.2/6 <br /> COMP. -rII� __ x 0. 75 x 0.26" _ T <br /> LAWN 8ax 0.20 x Q.2 _ x <br /> LANDSCAPE �g <br /> • S UHTUTAL <br /> M <br /> THE NEEDED POND CAPACITY = SUBTOTAL X P. = V div -0 <br /> LT L7 <br /> VOLUME DETERMINED WITH NO ALLOWANCE FOR. PERCOLATION.� 'ti <br />