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Qal = •0826 <br />Qo = Q allowable <br />Area X Cf <br />Qo = 0.2667 <br />T = 66.96 min. <br />Vs = J360766.97) <br />(66.96) + 25 <br />2626.33 - 714.33 <br />.0826 <br />0.344 .9 <br />-40 (.2667)(66.96) <br />Vs = 1912.0 <br />total Volume = (1912)(.344)(.9) = 592.0 cu. ft. <br />izino the Orifice <br />The minimum diameter orifice allowed in the city of Everett is 2". Therefore, <br />assuming a borda orifice with C = 0.51 A = 0.0218 for 2" orifice <br />Therefore <br />A='Y <br />g <br />gh = Q <br />CA <br />2 gh = � �2 <br />Cv <br />h = �0] 2 = 0.86' <br />NOTr• This h is much too small to fill up the retention system, therefore, we must <br />go tack through calculations to optimize the maximum flow thru a 2" orlfice. <br />7 <br />