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FIGURE 1 <br /> SURFACE WATER DITCH - TRAPAZOIDAL DITCH WITH 2:1 SIDE SLOPE <br /> SLOPE: 2.0 <br /> leo <br /> 140 <br /> 120- <br /> -100- <br /> so- <br /> go- <br /> 40- <br /> 2D <br /> 20V100 e0 eo4020 <br /> 0 ° 0S 1 15 z 25 3 <br /> Depth of Water (ft) <br /> f V.L(IM)str 0(ds) <br /> DEPTH WIDTH 0 VEL BASE SIDE SLOPE <br /> FEET (FEET),, FT'3 S 1 (FTZS) 2 n 3 FEET 3 --AY-L31- 3 <br /> 0 p p �:. ..•.... .., <br /> 0.25 2.0 0.6 1.7 0.04 1 2 0.020 <br /> 0.5 3.0 2.4 2.4 0.04 1 2 0.020 <br /> 0.75 4.0 5.6 3.0 0.04 1 2 0.020 :.. .. <br /> 1 5.0 10.6 3.5 0.04 1 2 0.020 <br /> 1.25 6.0 17.5 4.0 0.04 1 2 0.020 <br /> 1.5 7.0 26.8 4.5 0.04 1 2 0.020 ..: :. <br /> 1.75 8.0 38.5 4.9 0.04 1 2 0.020 :.. <br /> 2 9.0 52.9 5.3 0.04 1 2 0.020 <br /> 2.25 10.0 70.2 5.7 0.04 1 2 0.020 <br /> 2.5 11.0 90.8 6.1 0.04 1 2 0.020 <br /> 2.75 12.0 1 14.7 6.4 0.04 1 2 0.020 <br /> 3 13.0 142.1 6.8 0.04 L_2 0.020 "" ?, '� ::5%`s: •:<'• <br /> METHOD: MANNINGS EQUATION FOR OPEN CHANNEL FLOW <br /> (1) Q = V * AREA <br /> (2) VEL = 1.49 « R'.666 « SLOPE".5 / n <br /> (3) INPUT PARAMETER FOR DITCH <br /> (4) AREA = (BASE + (DEPTH « SIDE KV)) « DEPTH <br /> (5) R = AREA/WETTED PMETER = AREA / (BASE + 2 • (DEPTH"2 + (DEPTH • SIDE RV)-2 )".5) <br />