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,..i <br />'• <br />~,•j • <br />• • <br />Design (Bench drains, 0- <br />Q = (1.49/N) AR 2/3 S 1/2 <br />N = 0.040 <br />R = Area/Wetted Perimeter <br />A = area <br />S = 0.02 min. <br />Manning's Equation <br />2.5h: 1V 20h:1V <br />Flow Related to Depth <br />@d 5" Q = 3.6 CFS <br />@d=6" Q=5.8CFS <br />The 4.1 CFS will flow between 5" and 6" deep in the bench drains. <br />(New 10-31-90) <br />CRDA2 - 9 <br />