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• Revised Ditch Design <br />1. Ditch: 22-D6 (Revised 10/3/80) <br />2. Description: Diversion Ditch <br />3. Ditch Grade: 37 <br />4. Area Drained: 99.3 acres <br />5. Peak Discharge: (93)(1.12)(1.11) = 115.6 <br />6. Ditch Design: <br />* The peak discharge was assumed to be correct for the purposes <br />of the revised ditch design. <br />~• <br />n = .030 <br />Use ditch w/"V" walls 2:1 slope <br />From chart: 2' FB DT D = 2.07 <br />* Depth for "V" DT w/2:1 S1 <br />See chart 1-31.2-2 ~ <br />Calculations below <br />A = 2D + 2D2 V = 9.1 fps <br />= 4.14 + 8.57 <br />= 12.71 <br />D = 1IA <br />= 1 <br />= 2.52 <br />* D = 2.52 feet deep <br />Use 2.92 feet deep with 0.5 freeboard <br />L~ <br />