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Ditch Design <br />• <br />1. Ditch: 15-D1 <br />2. Location: Diversion above coal stockpile <br />3. Grade of Ditch: 58 <br />4. Area drained: 53 acres <br />5. Peak Discharge: 65(1.12)(1.14) = 83 Cfs <br />6. Ditch Design: <br />Rock lining; n = .045 <br />Ditch w/"V" walls, 1:2 slope <br />A = 2D2 <br />P = 9.472D <br />Rh = A/P = .4472D <br />4 = 38.39(D2.67)(.OS).5 <br />D = 2.67 33 <br />8.58 <br />• D = 2.33 <br />Pdd .5' freeboard <br />D = 2.83 feet <br />This ditch will be modified to 5.1 after Pond 15-D9 has been <br />installed. At that time, culvert C-6 will berate idled for <br />usage. New design parameters are 160 cfs (from 15-P9), 12 <br />percent and dirt lining (.06 = n). <br />• <br />