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<br /> , A���%��TCAV� Determining Number of
<br /> � �i.�►.--.T_• : �C�
<br /> STORMWAlER Cartridges for Systems
<br /> so�urioNs�N�. Downstream of Detention
<br /> Delerminina Number of Cartridqes for S1ormFilter Svstems
<br /> CONTECH Stormwa�er Solu�ions Inc. [nyine�i: JHR
<br /> Dale 5/22'2007
<br /> Site IMormeUon
<br /> , Projecl Name Mounlaln View Building C8D
<br /> Project Stale Washington
<br /> Project Localion Everett
<br /> Drainage Area,Ad 5.00 ac
<br /> , Impervious Area,Ai 3.73 ac
<br /> � Pervious Area,Ap �•Z�
<br /> %Impervious �5°^
<br /> Runolf Coeflicient, Rc �•�2
<br /> � Upsiream Delentlon System
<br /> Peak reloase rate Irom delenlion, 0,�,�„�r,„„ 1.52 ds
<br /> Treatmenl release rale fwm delention, Q�.,r,;p,,,•.,, 0.15 c1s
<br /> Delenlion pretreatmenl r,redit 5040
<br /> � Qrom removal elliciency calcs)
<br /> Mass Ioading calculallons
<br /> �i Mean Annual Rainfall, P 37 in
<br /> Agency roquired°5 removal 8a°�
<br /> Pr.rcent Runof�Capluro 90°6
<br /> �. Ivlean Annual Runofl,V, 436,011 «'
<br /> � Even�Maan Concenlration of PolWtanl, EMC 100 mg1
<br /> Annuol Mass load, M,p„i 2720.28 Ibs
<br /> � Num6er of cariridges-moss loading
<br /> Idass removed by pretreatmeN syslem, A1�..� 1360.14 Ibs
<br /> Mass load to lilters alter prelreatmenl, A1�.,,,, 1360.14 Ibs
<br /> Estimate Ihe required filter efliciency, [,,,�• 0.60
<br /> iMass lo bo capWred by fillers,A1,,,,,, 816.08 Ibs
<br /> P,Ilo�vablc Cartridgo Flow raie,Q,,,,, 7.5 gpm
<br /> Check tlial(]�,�can meel E�,,,�, OK
<br /> �� Number ol Carlridges required, N�„�; 23
<br /> Treatment Capacily 0.38 cis
<br /> Determine Critical Slzing Value
<br /> ' Number ol Carlridges using Q,ai,,:�„e,,, N�,�„ 9
<br /> Melhod lo Use: MASS-LOADING
<br /> I
<br /> SUMMARY
<br /> Treatment Flow Rate,cis 0.38
<br /> Cartridge Flow Rate,gpm 7.5
<br /> Numbcr of Cartridqes 23
<br /> v�
<br /> 12027-8 NE Airport Way
<br /> � �02006 CONTECH Stormwater Solulions Portland,OR 97220
<br /> contedistormwater.com Phone:800�54B-4GG7 Fax:503-258-3790 1 of 1
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