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3. Spillway <br />D = 8/3 ~- where Q = ACi = <br />29.799 <br />D 1.86 ft <br />For the following configuration <br />Design Length = 4D <br />40(108.7)(3.6) = 156.53 <br />~+---- 12 D---+~ <br />i D <br />4. Diversion Ditch Design <br />Southern End (1) <br />Drainage = 16.4 Ac Runoff coef = 0.4 Rainfall Intensity = 1.5 <br />Slope = .O1 Roughness factor = 0.03 <br />Q = ACi = 16.4 (.40)1.5 = 9.84 <br />2 3 <br />Q = 1.486 (2D')(D/Ilk / ~ = 9.84 <br />.03 <br />1.6984 = D8/3 <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 />160 = 1.486 (2D2)(D//~2/sV'n <br />.03 <br />~--- 4.88 ~ <br />1.22 ~ <br />2 <br />~--13.88-~ <br />3.'17 2 ' <br />27.616 = D8/3 <br />D = 3.47 ft <br />