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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Figure 4 <br />TEh1PORARY DIVERSION DITCH DESIGN CALCULATIONS <br />Maximum Drainage Area (acres) <br />Peak Flow, Q (cfs) <br />Average Slope of Ditch, <br />x (ft/f t) <br />Roughness Factor, n3 <br />Design Dimensions <br />H:V <br />~ D (ft) <br />b (ft) <br />K3 <br />Freeboard (ft) <br />g = K D8/3s1/2 <br />n <br />D = (Qn/K(sl/2))3/8 <br />Ditch A Ditch B Ditch C Ditch D Ditch E <br />9.30 12.65 5.91 12.65 3.18 <br />9.79 12.74 6.95 12.74 3.52 <br />0.0744 0.1135 0.0042 0.0121 0.012 <br />0.030 0.030 0.030 0.030 0.030 <br />1:1 1:1 2:1 1:1 1:1 <br />0.52 0.53 0.74 0.81 0.50 <br />2.10 2.14 2.98 3.25 2.02 <br />6.04 6.04 7.08 6.04 6.04 <br />.30 .30 1.00 1.00 .30 <br />3 ,Civil Engineering Handbook, Leonard Church Urquhart, Editor, McGraw Hill, <br />4th Edition, p. 4-77 and 4-78 <br />