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FORMUI AS FOR CALCULATION OF A <br /> STORM DRAIN POND'S VOLUME <br /> SA- 91 - 10 <br /> a� �,11 cY—Gl-uti I BASIC RUNOFF COEFFICIENTS <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-year , 48- hour storm <br /> FORMULAS <br /> yJ��pp� PPS go�11 G���\4 �J�of 4J El <br /> POND BASIN �`� z x 1 . 00 x 0.26 <br /> PAVING 4)- x 0. 95 x 0.26 = — <br /> ROOF = -8 x 0. 80 x 0.26 = <br /> COMP. EARTH= -5fr x 0.75 x 0.26 _ <br /> LAWN a = 3 280 x 0.20 x 0.26 = 1 -7L <br /> LANDSCAPE 28 <br /> SUBTOTAL = �� <br /> * THE NEEDED POND CAPACITY = SUBTOTAL X 2 SSI <br /> VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION . ) <br /> N cnF _ <br /> rZ,oNT FIALF or- SITS G-jR-NDr;_p -ro pa.A til <br /> TO , PP-L v✓/ IJo <br /> IN VOLUME of (LuuvFF FF:0H PSE-/Io US C--OWDITID1 <br /> / I.n iwDFvr_Lnr�r-_r)l <br />