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Assume h - 2.30 feet <br />Qal = •0826 <br />A = 0826 <br />(.51 TF 64.4 2.33 <br />A = .013 = 1-5/8" orifice <br />Too small so recalculate using C for Borda orifice. <br />Qmax = (A)(C)( 2gh ) <br />Qmax = (.0218)(0.51)( (64.4)(2.3)) <br />Qmax = 0.135 c.f.s. <br />Qmax> Qal <br />Q = 135 .436 <br />a T3«TT.�T- <br />T = -25 + P2255 <br />T = 46.92 min. <br />Vs = 3607(46.92) -40(.436)(46.92) <br />4 + <br />Vs = 2353.18 - 818.23 <br />V = 1534.95 <br />s <br />Total Volume of Storage = (1534.95)(.0344)(0.90) = 475 cu.ft. <br />Sizino the Detention System <br />24" pipe: 100 <br />LF @ 3.142 <br />ft. 3/LF @ 0.3% <br />= 314.2 ft.3 <br />18" pipe 80 LF <br />@ 1.767 ft.3/LF <br />@ 0.5% <br />= 141 ft.3 <br />3 <br />.BMH Type II - <br />48":(2.30 + <br />2.0) ft. @ 12.57 ft.3 /VF <br />= 54.0 ft. <br />CB No. 16: 1.5 <br />ft. @ 5.76 <br />ft. 3/VF <br />3 <br />= _ 8.72 ft. <br />Volume Provided <br />= 518 ft.3 <br />Volume Needed <br />= 475 ft.3 <br />Excess Volume <br />= 43 ft.3 <br />System O.K. <br />