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FORMULAS FOR CALCULATION OF A . <br /> STORM DRAIN POND'S_ -VOLUME <br /> BASIC RUNOFF COEFFICIENTS <br /> SURFACE COEFFICIENT <br /> POND or BASIN 1. 00 <br /> P'AVINIG; (1.vi,ca 6 i _� , u5Pn- uli , oiieui 3urtaCEs ) V.`u <br /> BUILDING or ROOF 0.80 <br /> COMPACTED' EARTH ( gravel ) . 0.75 <br /> LAWN, or LANDSCAPING 0.20 <br /> RUNOFF CALCULATED ­AT 3. 12" ( 0261 ) k <br /> ( a 10-yevr , 48- hour storm ) <br /> FORMULAS <br /> As <br /> POND BASIN = s9 co o x 1 . 00 x 0:26 .` 15� 7� %1 <br /> i - <br /> PAVING ay 0 x 0. 95 x 0:26 <br /> ROOF x 0. 80 x 0.26 <br /> r <br /> COMP. EARTH= 335a x 0.75 x 0.26 _ 3'77703 <br /> LAWN & _ (oc390 x 0.20 x 0.26 <br /> LANDSCAPE SUBTOTAL <br /> *THE NEEDED POND CAPACITY = SUBTOTAL X 2 = 10)6I4sCo 12 � <br /> VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION .) <br /> _. Avy. 0c-p <br />