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~• Revised Ditch Design <br />1. Ditch: 22-D8 <br />2. Description: Diversion Ditch <br />3. Ditch Grade: 117 <br />4. Area Drained: 33 acres <br />5. Peak Discharge: (44)(1.12)(1.14) = 56 <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 />Use ditch w/"V" walls 2:1 slope <br />i~ <br />From chart 2' FB DT D = 1.08 <br />* Depth for "V" DT w/2:1 SL <br />See chart 1031.2-2 ~ <br />Calculations below <br />A = 2D + 2D2 V = 12.5 fps <br />= 2.16 + 2.33 <br />= 4.49 <br />D =~- <br />_ <br />= 1.50 <br />* D = 1.50 feet deep <br />Use 2.D0 feet deep with 0.5 freeboard. <br /> <br />