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• <br /> Determining Number of <br /> ..,NTECH Cartridges for Flow Based <br /> ENGINEERED SOLUTIONS Systems <br /> CONTECH Stormwater Solutions Inc. Engineer: CRH <br /> Date 7/23/2014 <br /> Site Information <br /> Project Name Silver Lake Center <br /> Project State Washington <br /> Project Location Everett <br /> Basin ID CB-18 <br /> Drainage Area,Ad 0.76 ac <br /> Impervious Area, Ai 0.56 ac <br /> Pervious Area, Ap 0.20 <br /> %Impervious 74% <br /> Runoff Coefficient, Rc 0.71 <br /> Water quality flow 0.09 cfs <br /> Peak storm flow 0.34 cfs <br /> Filter System <br /> Filtration brand StormFilter <br /> Cartridge height 27 in <br /> Specific Flow Rate 1.00 9pmlft` <br /> Flow rate per cartridge 11.3 gpm <br /> SUMMARY <br /> Number of Cartridges 4 <br /> ©2006 CONTECH Stormwater Solutions <br /> contechstormwater.com 1 of 1 <br />