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~~ <br />Revised Ditch Des <br />51~ <br />1. Ditch: 22-D7 <br />2. Description: Diversion Ditch <br />3. Ditch Grade: 47 <br />4. Area Drained: 11 acres <br />5. Peak Discharge: 18(1.12)(1.12) = 22.58 <br />6. Ditch Design: <br />* The peak discharge was assumed to be correct for the purposes <br />of the revised ditch design. <br />n = .030 <br /> <br />Use ditch w/"V" walls 2:1 slope <br />From chart 2' FB DT D = 0.9 <br />* Depth for "V" DT w/2:1 S1 <br />See chart 1031.2-2 ~ <br />Calculations below <br />A = 2D + 2D2 V = 6.6 fps <br />= 1.8 + 1.62 <br />= 3.42 <br />D =~A <br />= 1.31 <br />* D - 1.31 feet deep <br />Use 1.81 feet deep with 0.5 freeboard <br /> <br />