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FIGURE 2 <br /> SURFACE WATER DITCH - TRAPAZOIDAL DITCH WITH 2:1 SIDE SLOPE <br /> SLOPE: 5.0% <br /> ,2 <br /> Io <br /> 250 <br /> 5 <br /> 200 <br /> n <br /> M ISO- <br /> IOD- <br /> 0. <br /> SO I00o o I Depth ofWater(ft) 2 3 <br /> DEPTH WIDTH Q VEL BASE SIDE SLOPE <br /> FEET FEET (FT-3Z§) 1 FT S n 3 FEET 3 H V 3 3 ' <br /> 0 0 20 : ..x>.a..:. <br /> 0.25 3.0 1.8 2.9 0.04 2 2 0.050 .` .. :•... '. .'.•.'V <br /> 0.5 4.0 6.3 4.2 0.04 2 2 0.050 .: `''+ x.• <br /> .......:......:. . <br /> 0.75 5.0 13.6 5.2 0.04 2 2 0.050 <br /> 1 6.0 24.2 6.0 0.04 ' 2 2 0.050 <br /> 1.25 7.0 38.4 6.8 0.04 2 2 0.050 $x.: <br /> 1.5 8.0 56.6 7.5 0.04 2 2 0.050 <br /> 1.75 9.0 79.1 8.2 0.04 2 2 0.050 <br /> 2 10.0 106.3 8.9 0.04 2 2 0.050 ;'.::....... . •.. :.:.. <br /> 2.25 11.0 138.5 9.5 0.04 2 2 0.050 <br /> 2.5 12.0 176.1 10.1 0.04 2 2 0.050 ,.,., :a::: < :.;:. :.> ...:• <br /> 2.75 13.0 219.3 10.6 0.04 2 2 0.050 .'`.: ;' «`s ' ' <br /> 3 14.0 268.4 11.2 0.04 2 2_1_0.050 • .,'.... >> <br /> METHOD: MANNIGS EQUATION FOR OPEN CHANNEL FLOW <br /> (1) 0 = V • AREA <br /> (2) VEL = 1.49 • R-.666 • SLOPE-.5 / n <br /> (3) INPUT PARAMETER FOR DITCH <br /> (4) AREA = (BASE + (DEPTH • SIDE RV)) • DEPTH <br /> (5) R = AREA/WETTED PERIMETER = AREA / (BASE + 2 • (DEPTH"2 + (DEPTH • SIDE RV)-2 )".5) <br />