Laserfiche WebLink
ty5 <br /> Determining Number of <br /> CNTECH® Cartridges for Systems <br /> ENGINEERED SOLUTIONS Downstream of Detention <br /> CONTECH Stormwater Solutions Inc. Engineer. MAZ <br /> Date 6/1/2012 <br /> Site Information <br /> Project Name Everett Storage Facility <br /> Project State Washington <br /> Project Location Everett <br /> Drainage Area,Ad 1.35 ac <br /> Impervious Area,Ai 1.22 ac <br /> Pervious Area,Ap 0.14 <br /> % Impervious 90% <br /> Runoff Coefficient, Rc 0.86 <br /> Upstream Detention System <br /> Peak release rate from detention, -release peak 0.08 cfs <br /> Treatment release rate from detention, -release treat 0.01 cfs <br /> Detention pretreatment credit 60% <br /> (from removal efficiency calcs) <br /> Mass loading calculations <br /> Mean Annual Rainfall, P 38 in <br /> Agency required%removal 80% <br /> Percent Runoff Capture 90% <br /> Mean Annual Runoff,Vt 142,237 fe <br /> Event Mean Concentration of Pollutant, EMC 60 mg/I <br /> Annual Mass Load, Mtotai 532.45 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, Mpm 319.47 lbs <br /> Mass load to filters after pretreatment, Mpasst 212.98 lbs <br /> Estimate the required filter efficiency, Efilter 0.50 <br /> Mass to be captured by filters, Mfilter 106.49 lbs <br /> Allowable Cartridge Flow rate, Curt 5.00 <br /> Mass load per cartridge, Mean(Ibs) 24.00 lbs <br /> Number of Cartridges required, Nmass 5 <br /> Treatment Capacity 0.06 cfs <br /> Determine Critical Sizing Value <br /> Number of Cartridges using -release treaty Nfiow 2 <br /> Method to Use: MASS-LOADING <br /> SUMMARY <br /> Treatment Flow Rate, cfs 0.06 <br /> Cartridge Flow Rate, gpm 5.0 <br /> Number of Cartridges 5 <br /> 1 of 1 <br />