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3 <br />4 <br />• • <br />Spillway <br />D = 8/3 -~- where Q = ACi = .40(108.7)(3.6) = 156.53 <br />29.799 <br />D = 1.86 f[ <br />For the following configuration <br />Design Length = 4D <br />~--- 12 D------~ <br />i o <br />Diversion Ditch Design <br />Southern End (1) <br />Drainage = 16.4 Ac Runoff coef = 0.4 Rainfall intensity = L.5 <br />Slope .O1 Roughness factor = 0.03 ' <br />Q = ACi = 16.4 (.40)1.5 = 9.84 <br />2 3 <br />Q = 1.486 (2DZ)(D/'(5) / ~ = 9.84 <br />.03 <br />(~-- 4.88 --~ <br />1.32 ~ <br />2 <br />1.6984 = DS/3 <br />D = 1.22 ft <br />Northern End <br />Drainage = 266.6 Ac <br />(Same Constants) <br />Q = 266.6 (.40)1.5 = 160 <br />~----13.8 8~---s~ <br />3•'17 2 ~ <br />160 = 1.486 (2D2)(D/~z/3 <br />.03 <br />27.616 = D8/3 <br />D 3.47 ft <br />