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,~ <br />~• <br />Revised Ditch Design <br />1. Ditch: 15-D4 <br />2. Description: Diversion Ditch <br />3. Ditch Grade: 77 <br />4. Area Drained: 45 acres <br />5. Peak Discharge (56)(1.12)(1.12) = 70.25 <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 See chart 1031.2-2 ~ <br />From chart 2' FB DT D = 1.35 <br />Depth for "V" DT w/2:1 SL <br />Calculations below <br />A = 2D + 2Dz V = 11.1 fps <br />= 2.70 + 3.65 <br />= 6.35 <br />D =~ A- <br />=-~3 5 <br />2 <br />= 1.78 <br />D = 1.78 feet <br />Use 2.28 feet deep with 0.5 freeboard <br /> <br />