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STORMFILTER TREATMENT VAULT <br /> Project Name: RITEAID#5231 -EVERETT By: P.A.D. <br /> Project Number: 08028 Date: 12/10/2008 <br /> DRAINAGE CRITERIA: City of Everett Storm Code <br /> RAINFALL METHOD: WWHM method r <br /> METHOD OF ANALYSIS: 1N1Ouf� <br /> Step 1)Calculate design flows V �„ n <br /> HM I <br /> Water quality flow: Qwq 0.095 cfs see attached WW ca cs <br /> Step 2)Calculate Number of Cartridges <br /> N = Number of Cartridges <br /> = Qwq * 449 gpm/cfs / (7.5 gpm/cart) <br /> 5.69 ===> USE 6 CARTRIDGES <br /> 72-IN DIA. PRECAST STORMFILTER <br /> Step 3)Flow Splitter Orifice Sizing <br /> Qwq = 0.10 CFS <br /> HT= 1.00 FT <br /> A= Qallowable/{ 0.62 * ( SQRT[2 * g * Ht] )} <br /> A= 0.019093651 SQ FT = 2.75 SQ INCHES <br /> d = SQRT[4*A/3.142] <br /> d = 1.9 INCH <br /> 08028-STMCLC.xls,STORMFILTER I 0 <br />