An open rectangular channel laid at a constant slope is required to carry a maximum discharge of 5 m3 /s and a minimum discharge of 1 m3 /s at a constant velocity of 1 m/s at all depths of flow. Compute graphically or otherwise the top width at the free surface and the depths of flow corresponding to minimum and maximum discharges. For minimum discharge a rectangular channel section of the most economical type may be designed.
(solved), A most efficient trapezoidal section is required to give a maximum discharge of 21.5 m3/s of water. The slope of the channel bottom is 1 in 2500. Taking C = 70 m1/2/s in Chezy’s equation, determine the dimensions of the channel. Also determine the value of Manning’s n, taking the value of velocity of flow as obtained for the channel by Chezy’s equation
(Solved) 15.5 State the conditions under which the rectangular section
(solved),An irrigation channel is to carry a discharge of 14 cumec with a velocity of 0.9 m/s and bed slope of 1 in 2500. The side slopes are 1 to 1. Find the depth and bottom width. The values of Chezy’s C for this channel for different values of hydraulic radius R are as tabulated below. . . . . . . . . ‘ Hydraulic Radius R 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 Chezy s C 34 35 37 38 39 40 41 41
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