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<br />1
<br />Determining Number of Cartridges forSystems Downstream of Detention
<br />PmJecL 18thAve West Datn: DecemUer 30, 2UOA
<br />Lo:.npon: Evcret6 WA SMI Engr.: 1HR
<br />Step 1 Determine mnalmum mlease rete fmm tletenUon
<br />Q�..�,s�...w (cfs)
<br />Step 2 Determine VenUnent release rete fmm detenUon
<br />Q�>b..,o<.� lcfsl
<br />Step 3 Inpul the pementege of pollutenL•emoval requlretl
<br />AEency°6
<br />Step4 CalculotopreVeatmenttemavolef(IclenqusingFHWAmethod
<br />Volume of selUing �asin, Vb Qt')
<br />Runofl Volume, Vr (Il'1
<br />RJllO 01 V�/Vf
<br />Ocpth ol water In basin, H Qp
<br />Prelreatmen[ Elficiency, Ep,.
<br />(no[ to ezceetl 50%, sec attaclied graplp
<br />Siep 5 Cnlculato tho annual mnss lootl
<br />Menn Annual Rainlall, P (in)
<br />Site Are�, A (acres)
<br />Impervious Area (acres)
<br />Pereent Imperviaus (»)
<br />Composile Runoll Coeflicient, C
<br />�eicent Runafl CaU�we
<br />Mean Annunl Runoff,V� (fC')
<br />Event Mean Concenuation o� Pollutant, EMC (mg/p
<br />Nmual Mass Load, W,�.,, (IUs)
<br />Step 6 Calculate the numbor of cnrVldges on a mesalooding besls
<br />btass removed �y protrealment systein, M�,,, (Ibs)
<br />htass loatl to lilters after pretreatmen6 h1 �,,,� (ibsl
<br />[slimele the reyuireJ liller elfiCiency, E�;;,.
<br />Glass to be caPlured by lilteis, M,,,,., U�s1
<br />Allowabie Cartridge Flow rale, Q�,�(gpnQ
<br />Check Oml Q�,� can meet E�,;��,
<br />ntass haU per cartridge, Mu,� (Ibs)
<br />NmnUet of Canritlges required, Nm,,,
<br />Treatinent Capaciry (cls)
<br />Step 7 Determine Cdticul5lzing VeWe
<br />Number of CartriUges using Q,,,�.,�,,,,,• R,ti„
<br />Step B Chose Melhod Wlih Most Numbero( Cartddges
<br />Me.lhod to Use:
<br />t Flaw Rate
<br />Plow Rate
<br />0.199
<br />0.01
<br />BQ% �
<br />402
<br />I 1,031 I
<br />0.39
<br />0.9G
<br />35;5
<br />37
<br />0.67
<br />0.29
<br />43�
<br />0.44
<br />90'.4
<br />35,599
<br />100
<br />222.30
<br />77.74
<br />144.37
<br />69'�
<br />� 99.95
<br />7.5
<br />OK
<br />36
<br />�
<br />0.05
<br />�
<br />MASS-LOADING
<br />0.05
<br />7.5
<br />3
<br />Pagc t
<br />
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