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10910 HOLLY DR 2025-07-28
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10910 HOLLY DR 2025-07-28
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Last modified
7/28/2025 9:26:26 AM
Creation date
7/28/2025 9:25:40 AM
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Address Document
Street Name
HOLLY DR
Street Number
10910
Notes
STORM DRAINAGE STUDY
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I <br /> 0i/ ►il'�'ev 'rre Determining Number of <br /> I ""'','''""` ! ""' "" Cartridges for Systems <br /> STORMWATER g y <br /> '" LUTION c. Downstream of Detention <br /> 1 <br /> CONTECH Stormwater Solutions Inc. Engineer: JHR <br /> I <br /> Date 6/25/2008 <br /> Site Information <br /> Project Name Goldfinch Brothers Commercial <br /> I <br /> Project State Washington <br /> Project Location Everett <br /> Drainage Area,Ad 1.20 ac <br /> Impervious Area,Ai 0.83 ac <br /> 111 Pervious Area,Ap 0.37 <br /> Impervious 69% <br /> Runoff Coefficient, Rc 0.67 <br /> I <br /> Upstream Detention System <br /> Peak release rate from detention, Qrelease peak 0.16 cfs <br /> Treatment release rate from detention, Qrelease treat 0.01 cfs <br /> I Detention pretreatment credit 50% <br /> (from removal efficiency calcs) <br /> Mass loading calculations <br /> I <br /> Mean Annual Rainfall, P 37 in <br /> Agency required % removal 80% <br /> Percent Runoff Capture 90% <br /> I Mean Annual Runoff,Vt 97,549 ft' <br /> Event Mean Concentration of Pollutant, EMC 100 mg/I <br /> Annual Mass Load, Mtotai 608.61 lbs <br /> I <br /> Filter System <br /> Filtration brand StormFilter <br /> Cartridge height 18 in <br /> I <br /> Specific Flow Rate 1.0 gpm/ft2 <br /> Number of cartridges-mass loading <br /> Mass removed by pretreatment system, Mpre 304.31 lbs <br /> 1 Mass load to filters after pretreatment, Mpassi 304.31 lbs <br /> Estimate the required filter efficiency, Effiter 0.60 <br /> Mass to be captured by filters, MFiter 182.58 lbs <br /> 1 Allowable Cartridge Flow rate, Ocart 7.50 <br /> Mass load per cartridge, Wart(Ibs) 36.00 lbs <br /> Number of Cartridges required, Nmass 6 <br /> ITreatment Capacity 0.10 cfs <br /> Determine Critical Sizing Value <br /> I <br /> Number of Cartridges using Qrelease treat, Nflow 1 <br /> Method to Use: MASS-LOADING <br /> 1 SUMMARY <br /> Treatment Flow Rate, cfs 0.10 <br /> Cartridge Flow Rate, gpm 7.5 <br /> 1 Number of Cartridges 6 <br /> 1 of 1 <br /> 1 <br />
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