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wV/ V'lCAV® Determining Number of <br /> STORMWATER Cartridges for Systems <br /> SOLUTIONS INC. Downstream of Detention <br /> CONTECH Stormwater Solutions Inc. Engineer: KET Blue Cells= Input <br /> Date 5/29/2008 Black Cells= Calculation <br /> Site Information <br /> Project Name Casino Road Office Building <br /> Project State Washington <br /> Project Location Everett <br /> Drainage Area,Ad 0.54 ac <br /> Impervious Area,Ai 0.48 ac <br /> Pervious Area,Ap 0.07 <br /> % Impervious 88% <br /> Runoff Coefficient, Rc 0.84 <br /> Upstream Detention System <br /> Peak release rate from detention, Qrelease peak 0.09 cfs <br /> Treatment release rate from detention, Qrelease treat 0.09 cfs <br /> Detention pretreatment credit 30% <br /> (from removal efficiency caics) <br /> Mass loading calculations <br /> Mean Annual Rainfall, P 37 in <br /> Agency required % removal 80% <br /> Percent Runoff Capture 90% <br /> Mean Annual Runoff,Vt 54,940 ft° <br /> Event Mean Concentration of Pollutant, EMC 100 mg/I <br /> Annual Mass Load, Mtotai 342.77 lbs <br /> Filter System <br /> Filtration brand StormFilter <br /> Cartridge height 12 in <br /> Specific Flow Rate 1.0 gpm/ft2 <br /> Number of cartridges-mass loading <br /> Mass removed by pretreatment system, Mpre 102.83 lbs <br /> Mass load to filters after pretreatment, Mpassi 239.94 lbs <br /> Estimate the required filter efficiency, Eflter 0.71 <br /> Mass to be captured by filters, Mfilter 171.38 lbs <br /> Allowable Cartridge Flow rate, Qcart 5.00 <br /> Mass load per cartridge, Mcart(lbs) 24.00 lbs <br /> Number of Cartridges required, Nmass 8 <br /> Treatment Capacity 0.09 cfs <br /> Determine Critical Sizing Value <br /> Number of Cartridges using —release treat Nflow 8 <br /> Method to Use: MASS-LOADING <br /> SUMMARY <br /> Treatment Flow Rate, cfs 0.09 <br /> Cartridge Flow Rate, gpm 5.0 <br /> Number of Cartridges 8 <br /> 1 of 1 <br />