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:quation for approximating <br />e ratio (E): <br />sn <br />VR <br />e midpoints of two storms, h <br />. ft'/h <br />:orm, ft' <br />��A <br />ween storms on the average 's I <br />that can be rcmoved between ator <br />torm volume that enters much of i <br />er from prior storms. Thus effect <br />ates the effect that emptying rate 1 <br />in removals during runoff and dur <br />us the removals can be muitiplied <br />nrnals can be estimated by <br />�al — 100 — 100 <br />ring runoff conditions <br />:ring quiescent conditions <br />percent solids removal using a m <br />x all stortn events and compared <br />ifall volume o[ 0.52 in. (and no ru <br />',, = 1.28 and found that the ow <br />about 75% for both calculations. <br />�s about 2% of watershed. <br />i pond with a storage volume <br />5•acre commercial site with a <br />ids is given by Table 7.5. The p <br />92 MODELJNG CONCEPTS FOR WET•DETENTION PONOS 287 <br />� � j�O��Gf vOwMt IEMrrv�l <br />y� � ME�NI1UNOf/VO�UME � <br />DO <br />so <br />z.o � <br />�.o <br />0.75 <br />OS ql; <br />W <br />o� <br />0 <br />Figurc 8.7 ERect ot previous stortns on long-term eRective storage capacity. (From <br />U.S. Environmental Protection AgencY. 1986.) <br />storage volume is St)00 ft� with an average surface area of 1260 ft2. The <br />rainfail statistics for the area were calculated for a local area in the United <br />States. <br />Aeerage volume cf precipitation: <br />Average rainfall inrensiry: <br />Average duration: <br />A��erage inteival oetween: <br />P= 0.53 in., C�P = 1.44 <br />f= 0.086 in./h, C�� = 1.31 <br />p— 7.2 h, C�o = 1.09 <br />S= 85 h, C�S = 1.00 <br />What i= an estimatc of solids removal on a long-term (a�•erag � annual) basis? <br />