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<br />Diversion Dirch Design <br />O.B. /f9 Temporary Valley Fi11 <br />Grade of Ditch: 157 <br />Area Drained: 13 acres <br />Soil Type: Fort Collins variant Hydro Group B <br />CN Value: 69 <br />Peak Discharge: 17 cfs <br />Ditch Design <br />n = .03 <br />Use ditch w/"V" walls 2:1 slope See chart 1031.2-2 fi <br />Calculations below <br />From chart 2' FB DT D=0.52 A=2D + 2Dz V - 10 fps <br />=1.04 + 2.7 <br />=1.31 <br />I~ <br />* Depth for "V" Dt w/2:1 SL D= A <br />z <br />D= 1.31 <br />D= 0.81 <br />*D = 0.81 feet deep <br />Add 0.5 feet freeboard <br />Total Ditch Depth = 1.31 feet <br />~~ <br />,~, v- y7JCd,U <br />