Laserfiche WebLink
FORMUI AS FOR CALCULATION OF A <br /> STORM DRAIN POND'S VOLUME <br /> sA— 9 1 — 1O <br /> AL P�ruL--�i-IfW 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 /> ( o 10-yeor , 48 - hour storm ) <br /> FORMULAS <br /> pG� p �t1 ��t E� �• <br /> 4J�� PPS gO 40� PJ�o GJ <br /> POND BASIN �`� 2 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= -55- x 0.75 x 0.26 = <br /> LAWN a = 280 x 0.20 x 0.26 <br /> LANDSCAPE T— 28 <br /> SUBTOTAL = <br /> THE NEEDED POND CAPACITY = SUBTOTAL X 2 Sal <br /> VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION . ) <br /> _ _. <br /> MWNT F��tF or- srr� ��2�� ro Pnb hl <br /> Tv ; GTS T FF4Z CAL—_rftA. aS V/ klo G /,Ac--,F <br />