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Icovc ����. Mc ��ixar tTORMWA� <br />L___ __'_'—'— '_�..u�._r_— <br />Determining Number of Cartridges for Systems Cownstream of Detention <br />ProJecL• Mounlaln View Plaza Date: lune 27, 2005 <br />LocaGorr. Evcret4 WA SMI En� : lora leligdon <br />Step 1 <br />Step 2 <br />Step 3 <br />Oetermine maxlmum release rete from detenUon <br />Q�es.ye�.. (efs) <br />Determine VeeUnent rnlease rete trom detenUon <br />QMmseve�l (CfS) <br />Inpu[ the percentage M pollutent removal reQultetl <br />OAZ <br />0.03 <br />ngency % 80°� <br />Stap4 CulculetepretreotmentremowleHklencyusingFHWAmethod <br />Volume of se�tling basin, W(ft�) �� <br />Step 5 <br />Step 6 <br />Slep 7 <br />Slep 8 <br />Runofl Volumc, vr (fP) <br />Rotlo of Vb/Vr <br />Depth of wnter In basin, H(fq <br />Prelreetment Efficieixy, FY,. <br />(not to exceed 50%, see etWchetl G�aphl <br />Colcutnte the annual mass bad <br />Mean Annual Rainfall. P (In) <br />Sitc Nea. A (acres) <br />Impervious Nea (acres) <br />Pcrcentlm�xrvlous(%) <br />Composrte RunoB Coellidenl, C <br />Percent Runofl Caplure <br />Mean Ninual Runoll,V� pl') <br />Event Mcan Concentration of Pollutant. EtitC (m�ll <br />Annuai Mass Load.1.1�M.� (IUsI <br />Cniculoto the number of canrldges on o mass-IoaAing basis <br />hlass �emoved by pretreahnent s�slem, At„� (Ibs) <br />M11ass load lo flltcrs aflcr prelreatment. Mr.+s,� (i6s) <br />[stimnte Ihc requireU 61ter elficiency, E„�„ <br />Mass to Uc capWred by littcrs. At„�� QUs) <br />Allowa6lC Cartridgc Flow rolc, Q� (gpml <br />Check t0at Q,..� Can meel E���r <br />Mass load per cartridge, M�„� (lbs) <br />Number of Carldtlges requlred, N,,,ass <br />Treatment Capacity (cls) <br />Determine Rttical SI:I�gValue <br />Numl�er of Cartrid�es using Q,r�.,�n�.�• Nn,„. <br />Choso Method Wlth Most Numberot Certrldges <br />Methotl �o Use: <br />SUMMARY <br />ITreatment Flow Rat <br />�Cartridge flow Rate <br />INumber o1 CartritlC� <br />L.—_� <br />1.00 <br />�=J <br />50°5 <br />37 <br />2.5 <br />1.8 <br />72 <br />0.70 <br />90ti <br />210.934 <br />100 <br />1.316.0? <br />658.01 <br />G58.01 <br />60?; <br />39J.81 <br />7.5 <br />OK <br />36 <br />SI <br />0.18 <br />�� <br />MASSLOADING <br />�,,��,��; ��fJ���Jt.�ks <br />3o49c�- �er FH�yw�H nu+Lti.����5 <br />ClY1D@�1 (�PCii C�cU+{� - C ���J` ��)• <br />V � <br />Page 1 <br />z� <br />