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Mrs <br />'0�x <br />9CC: xy ^HH <br />IN H <br />rC 0 <br />q; <br />OH <br />H <br />y <br />CA H <br />i C) <br />H t7 <br />H M S <br />0. 0 <br />t y <br />HH <br />gy H <br />�Um <br />Z H to <br />HOtn <br />b@"e" <br />This is less than the now that would occur through a 2-inch diameter orifice. Based on a 2 inch diameter <br />orifice and 4 feet of head, an estimated release rate of 0.22 cfs is used to size the storage required. Per <br />City of Everett the volume of storage required for the Edgewater basin is 0.85 ac-ft., or 37,026.0 CF. <br />Q. (Japanese Gulch) = (10.58)(0.118) = 1.25 cfs <br />Per City of Everett the volume of storage required for the Japanese Gulch basin is 0.14 ac-ft., or 6,099.4 <br />CF. <br />Each drainage system is designed to allow for no bypass of flow from the developed site. <br />Edgewater Basin: <br />Storage Required = 37,026.0 CF <br />Storage Provided = 37,400 CF <br />Japanese Gulch Basin: <br />Storage Required = 6,098.4 CF <br />Storage Provided = 6,700 CF <br />Size Orifice: <br />Edgewater Basin: <br />Q = Ca 2gh Where: Q = flow released, cfs <br />C = coefficient for sharp edged <br />orifice = 0.62 <br />d = 4a a = area of orifice, ft 2 <br />J g = gravitational constant = 32.2 ft.2/sec. <br />It = head = overflow - invert = 564.5 - 560.4 = 4. l' <br />d = diameter of orifice, ft. <br />Per City of Everett, set d = 2 inches = 0.167 ft. <br />0.167 = 4a <br />m- <br />aPa = 0.022 ft. <br />Q = (0.62)(0.022)( (2)(32.2)(4.1) ) <br />Q = 0.22 cfs <br />8488.03/D10 <br />