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�� <br />Comparison of Ciry of Everett Standard Detention <br />Vault to Corrugated Metal Pipe Vault <br />December 2, 1994 <br />File No. 24-92-009-007-01 <br />Page 3 <br />E=1—e� W�� <br />L <br />td Vo <br />Qo <br />v� Ac <br />� A�L <br />td= s Qo <br />� <br />w�A�L� <br />E=1-e <br />��� = l - e�- ��°-) <br />�_ wA�L � <br />E=1—e � <br />For Sterling, the permicced+ rectangular vault design has the following pazameters: <br />Qo = 2@430 GPM = 860 GPM (from stormwater calcs & S4N pllmp) <br />= x .002228 � M =1.92cfs <br />A� = T x 20' = 140 ft2 <br />L = 12S <br />x=r <br />w=.0004 5(Settling rate for silt from DOE manual page III- 4- 8) <br />wA L .W01 x 1�0 x I75 � <br />E=1-e��� =1-e� `� " <br />E =.40 or 40% <br />