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<br />Table III-l.-Unij(}rm jlow in trapezoidal channels by Manning's formula. -Continued, from Reference 111.3. <br /> <br />d/b Qn ~i---A <br /> VaJuesof "0 -. <br /> b81l S 1/2 I I <br /> z I+-b-+l z <br /> z=O z = 1/4 z = 1/2 z = 3/4 z = I z = 1-1/4 I = 1.112 z = 1.3/4 z'"' 1 l'"' 3 <br />1.50 1.16 1.94 2.18 3.63 4.46 5.26 6.04 6.81 7.55 10.4 <br />1.55 1.20 2.05 2.96 3.88 4.18 5.65 6.50 7.33 8.14 11.3 <br />1.60 1.26 2.15 3.14 ".14 5.12 6.06 6.99 7.89 8.79 12.2 <br />1.65 1.30 2.21 3.33 ".41 5.47 6.49 7.50 8.47 9.42 13.2 <br />1.70 1.34 2.38 3.62 4.69 5.83 6.94 8.02 9.08 10.1 14.2 <br />1.75 1.39 2.50 3.73 4.98 6.21 7.41 8.57 9.72 10.9 15.2 <br />1.80 1.43 2.62 3.93 5.28 6.60 7.89 9.13 10.4 11.6 16.3 <br />1.86 1.48 2.74 4.15 5.59 7.01 8.40 9.15 11.1 12.4 11.4 <br />1.90 1.52 2.86 4.36 5.91 7.43 8.91 10.4 12.4 13.2 18.7 <br />1.95 1.61 2.99 4.59 6.24 7.87 9.46 11.0 12.6 14.0 19.9 <br />2.00 1.61 3.12 4.83 6.58 8.32 10.0 11.7 13.3 14.9 21.1 <br />2.10 1.71 3.39 5.31 7.30 9.27 11.2 13.1 15.0 16.8 23.9 <br />2.20 1.19 3.67 5.82 8.06 10.3 12.5 lA.6 16.7 18.1 26.8 <br />2.30 1.89 3.96 6.36 8.86 11.3 13.8 16.2 18.6 20.9 30.0 <br />2.40 1.98 4.26 6.93 9.72 12.5 15.3 17.9 20.6 23.1 33.4 <br />2.50 2.07 4.58 7.52 10.6 13.1 16.8 19.8 22.7 25.6 37.0 <br />2.60 2.16 4.90 8.14 11.6 15.0 18A 21.7 25.0 28.2 40.8 <br />2.70 2.26 5.24 8.80 12.6 16.3 20.1 23.8 27.4 31.0 44.8 <br />2.80 2.36 5.59 9.49 13.6 17.8 21.9 25.9 29.9 33.8 49.1 <br />2.90 2.44 5.95 10.2 14.7 19.3 23.8 28.2 32.6 36.9 53.7 <br />3.00 2.63 6.33 11.0 15.9 20.9 25.8 30.6 36.4 40.1 58.4 <br />3.20 2.72 7.12 12.5 18.3 24.2 30.1 35.8 41.5 47.1 68.9 <br />3.40 2.90 7.97 14.2 21.0 27.9 34.8 41.5 48.2 54.6 80.2 <br />3.60 3.09 8.86 16.1 24.0 32.0 39.9 47.8 55.5 63.0 92.8 <br />3.80 3.28 9.81 18.1 27.1 36.3 45.5 54.6 63.5 72.4 107 <br />4.00 3.46 10.8 20.2 30.5 41.1 51.6 61.9 72.1 82.2 122 <br />4.50 3.92 13.5 26.2 40.1 54.5 68.8 82.9 96.8 111 164 <br />5.00 4.39 16.7 33.1 61.6 70.3 89.2 108 126 145 216 <br /> <br />III-18 <br />