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FIGURE 3 <br /> SURFACE WATER DITCH - TRAPAZOIDAL DITCH WITH 2:1 SIDE SLOPE <br /> SLOPE: 8.0% <br /> 16 <br /> 350 <br /> id <br /> 300 <br /> 12 <br /> 250 <br /> 10 <br /> ^ u <br /> u <br /> N 200 <br /> \ 6 <br /> M <br /> 150 <br /> o <br /> 100-- <br /> so <br /> 2 <br /> 0 3 <br /> 0 03 ' death ofWater (H) 2 2S <br /> DEPTH WIDTH Q VEL BASE SIDE SLOPE <br /> FEET FEET FT"3 S 1 FT S 2 n 3 FEET 3 RV 3 <br /> f <br /> 0 0 p <br /> 0.25 3.0 2.3 3.6 0.04 2 2 0.080 <br /> 0.5 4.0 7.9 5.3 0.04 2 2 0.080 <br /> 0.75 5.0 17.2 6.6 0.04 2 -2-1 0.080 :..•.'. <br /> 1 6.0 30.6 7.6 0.04 2 2 0.080 � ? <br /> 1.25 7.0 48.5 8.6 0.04 2 2 0.080 <br /> 1.5 8.0 71.5 9.5 0.04 2 2 0.080 :a. .. .. <br /> 1.75 9.0 100.0 10.4 0.04 2 2 0.080 <br /> 2 10.0 134.4 11.2 0.04 2 2 0.080 ,,.. ,..,,::. ;: ..:. .•: <br /> 2.25 11.0 175.2 12.0 0.04 2 2 0.080 <br /> 2.5 12.0 222.7 12.7 0.04 2 2 0.080 .::..`s^$°�, .. <br /> 2.75 13.0 277.4 13.4 0.04 2 2 0.080 <br /> 3 14.01 339.6 14.1 0.04 2 2 0.080 ' .'. , <br /> METHOD, MAMNGS EQUATION FOR OPEN 04ANNEL FLOW <br /> (1) 0 = V • AREA <br /> (2) VE. = 1.49 • R".666 • SLOPE-.5 / n <br /> (3) INPUT PARAMETER FOR DITCH <br /> (4) AREA = (BASE + (DEPTH • SIDE I+V)) • DEPTH <br /> (5) R = AREA/WETTED PERIMETER = AREA / (BASE + 2 ' (DEPTH-2 + (DEPTH • SIDE RV)-2 )".5) <br />