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<br /> . . . cawt a�v��..w[ sme[_.. (�570RMWATERY J
<br /> � .,... „� I
<br /> Determining Number of Cartridges for Systems Downstream of Detendon
<br /> ProJecC Silver LaNe MeAical Date: September 2,200A
<br /> Location: Evcretl,Washinglon SMI Engr.: Sarah Hunt
<br /> Step i Determine mexlmum release rate from detentlon
<br /> Q,...,.a.. (cls) ��
<br /> Stap 2 Determine Veatment releese reta from detentlon
<br /> Q,e....o�.�(cfs) 0.03
<br /> Step 3 Input tha parcentage of pollutsnt removel requlred
<br /> qqency% 80%
<br /> Step 4 Calculete pretreetmant removal eHiclenry using FHWA method
<br /> Volumc of Se�tling ba5in,Vb((t�) 5,376
<br /> Runofl Vo!ume,Vr(fl�) q,�77
<br /> Ratio M Vb/Vr 1.20
<br /> Depth of walei in basin.II pq 1.56
<br /> PreVealmenl Elliciency,F�„� 60%
<br /> (not lo exceeJ 50Y�,see attaclied graph) lallowinq more cretlit for multiple pretreatment systems�
<br /> Step 5 Caicuie[e the ennual mess Ioed
<br /> Mcan Annual Rainfall,P(In) 38
<br /> Site Arca,A(acres� 1.81
<br /> Impervlous Are2(acres) 1.A9
<br /> Peicent Impervious(%) 82
<br /> Composite Runo(1 Coeffldent,C 0.79
<br /> re�ceni r�unon c,n«��e 90%
<br /> Mean Annual Runo11,V�(ft'� 177,067
<br /> [vent Meen Concenhalion ol P011utanL EMC(mg/p 300
<br /> Annual Mass Load,M„„,,,(165) I,10A.72
<br /> Step 8 Calculete the number of cartddges on a mess-loading besis
<br /> Mass rwnoved by prelrealment system,A�,,,,(Ibs) 662.83
<br /> MaSs IoaA to lilteis 2fler pretrealmenl,h�„:,i(���5) 4A1.89
<br /> Estimale�he requireA(iller e�ficiency,E�,,,,, 50'H
<br /> Mass to be captwetl by lilteis,M„n„Qbs) 22p,9A '�,
<br /> Allowable CartriAge flow rale,Q�,,,�Ip�m) 7.5 ',
<br /> Cl,eck Ihat Q�,�can rneel[�;n.� OK
<br /> Mass load per cartridge,M�„�(Ibs) 36
<br /> Number af Cnrtridges required,N,,,�„ �
<br /> Treatment Capaciiy�c(s) 0.10
<br /> Step7 DetermineCrlticalSlzingVelue
<br /> Namber of GvUidges using Q�.�.,..�,.,�.Nn,,., �
<br /> Step 8 Chose Method Wlth Most Number of Certrldges
<br /> MethoA to Use: MhS5�L0ADING
<br /> Sl1MMARY /�
<br /> TreaUnent flew Rate 010
<br /> CartriAge Flow Rate 7.5
<br /> Number of CarUidges 6
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