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FORMUI AS FOR CALCULATION OF A STORM DRAIN POND'S VOLUME <br /> S�q- � I - In <br /> �L � �-1�►� BASIC RUNOFF COEFFICIENTS <br /> y � w. N►I�-r{-I�w S R T� <br /> . SURFACE COEFFICIENT <br /> POND or BASIN 1. 00 <br /> PAVING (concrete , asphalt, oiled surface ) 0.95 <br /> BUILDING or ROOF 0.80 <br /> COMPACTED EARTH ( gravel ) . . . . . . . . . . 0.75 <br /> LAWN or LANDSCAPING 0.20 <br /> RUNOFF CALCULATED AT 3.12" ( 0.26 ' ) <br /> a 10-yeor , 48 - hour storm ) <br /> FORMULAS <br /> FpC111- <br /> PONDBASIN �`�Z x 1 . 00 x 0.26 <br /> PAVING x 0. 95 x 0.26 = <br /> ROOF x 0. 80 x 0.26 - — <br /> COMP. EARTH = x 0.75 x 0.26 = <br /> LAWN a 3250 x 0.20 x 0.26 <br /> LANDSCAPE 28 <br /> SUBTOTAL = <br /> * THE NEEDED POND CAPACITY - SUBTOTAL X 2 S� <br /> VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION . ) <br /> ANT [Kr- <br /> -To . <br /> Kr-` o , C-Al_TiLAJJS I.io <br /> IIJ VOLUME of P-uK1vFF FP-c)M PIzE-VIoUS coo -IDITICJJ_s <br /> CI•e, UopEYf=L-of'Ep) <br />