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� � - . . . . . <br /> . . . . <br /> Because this site is located in the combined storm and ssnitary sewa area, storm wua <br /> treatment is not required but detention is. As stated previously, the City of Everett On-Site <br /> Detention.Requirements wo :�cet was usad to design tl�e detention system Acoording to the <br /> wotksheet,the total required storage is 30 cubic feet. If a type 2-54"catch basin were used for <br /> storage,the required 30 cubic feet wouM be stored at an elevation of 1.89'. Also,aocording to the <br /> worksheet the allowable releasc rate is 0.457 c.f.s., which at a depth of 1.89'would pass through a <br /> 3.86"orifice. <br /> Standard Orifice Calculation: <br /> Q=Ca A(2GI-n�rz <br /> Where: <br /> Q=0.457 cfs <br /> Cd=0.51 <br /> H= 1.89' <br /> G=32.2 f/secZ <br /> A=azea of orifice <br /> 0.457=0.51 x A(2 x 32.2 x 1.g9)'i2 <br /> A=0.081 sq. ft. <br /> Orifice=032'=3.86" <br /> s <br /> � <br />