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Vortechs'"'Sformwafer Treatment Sysfems <br /> � VORTECHS SYSTFM NET ANNUAL TSS REMOVAL EFFICIENCY <br /> r� Silver Lake Ridge <br /> Everett, WA, <br /> Sfiormwater�CQ . Model 1000 � <br /> _. �� system was <br /> Design Ratio� _ ��•31 acres) x !0.6)x (449 qpm/cts) _ 49� <br /> (7.1 s� <br /> Rainfall Intensitv Ooeretinq Ratez %Total Rainfall Rmvl. Effcv' Rel. Effcv <br /> "/hr misf Volume' % % <br /> 0.02 1.0 17.1% 96.0% 16.7% <br /> O.Od 2.0 17.1°/a 98.0% 16.7% <br /> 0.06 3.0 16.6% 97.0% 16.1% <br /> 0.08 4.0 11.8% 95.8% 11.3% <br /> 0.10 5.0 9.6% 94.1% 9.1% <br /> 0.12 6.0 G.9% 92.6% 6.4% <br /> 0.14 7.0 4.9% 91.2% 4.5% <br /> 0.16 8.0 4.2% 90.0% 3.8% <br /> 0.18 8.9 3.4% 88.3% 3.0% <br /> i <br /> 0.20 9.9 2.3% 87.1% 2.0% <br /> 0.22 10.9 1.3% 85.8% 1.1% <br /> 0.24 11.9 1.2% 84.0% 1.0% <br /> 0.26 12.9 1.0% 82.2% 0.8% <br /> � 0.28 13.9 0.9% 80.3% 0.7% <br /> 0.30 1A.9 0.5% 79.1% 0.4% <br /> 93.8% <br /> % rain talling at>0"/hr or bypassing treatment= 1.0% <br /> Assumed removal eFficiency tor bypassed flows= 0.0% <br /> Remov3l EHiciency Adjustments= 0.0°/a <br /> Net Annual TSS Removal Efficiency= 94°/, <br /> 1 -Design Ratio=(iotal Drainage Area)x(Runolf Coelficienl)x(cfs lo gpm conversion)/Gril Chamber Area <br /> - The Total Drainage Area and Runo(f Coefficient is specified by the sile engineer. <br /> - The cornersion(actor Irom ds to gpm is 449. <br /> , 2-Operating Rale(gpm/sQ=intensiry("!hr)x Desi9n Ratio. <br /> 3-Based on 10 years of houdy rain(all data from NCDC station 7458,SeaUle Urban Site,King Counry.WA <br /> 4-t3ased on VoAechnics laboralory verifed rei��oval ol 50 micron parlicle gradation(see Technical Bulletin#1). <br /> 5-ReJuction due to use of 6Pminule data for a site lhat has a time of concentration Iess than 30-minules. <br /> Calculated b : 1/20/06 EKN Checked b : <br /> i' <br /> '✓ <br /> ! �,� <br /> ADS Vx1000 V23l2006 � - �'' <br /> � <br />