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Ditch Design <br />• <br />1. Ditch: 15-D2 <br />2. Location: West of Coal stockpile, diversion <br />3. Grade: 5$ <br />4. Area: 15.5 acres <br />5. Peak Discharge: 24(1.12)(1) = 27 <br />6. Ditch Design: <br /> Rxk lining, n = .045 <br /> 1:2 slope <br />Ditch w/"V" walls <br /> , <br />A = 2D2 <br /> P = 4.472D <br /> Rh = A/P = .4472D <br /> ~ _ (38.39)(D2.67)(.OS).5 <br /> D = 2.67/ 27 <br /> ~ 8.58 <br />• D = 1.52 feet <br /> Pdd .5' freeboard <br /> D = 2.02 feet <br />This ditch is temporary until working in Section 15 begins and <br />sediment control in installed. <br />• <br />