An irrigation channel of trapezoidal section, having side slopes 3 horizontal to 2 vertical, is
to carry a flow of 10 cumec on a longitudinal slope of 1 in 5000. The channel is to be lined for which the value
of friction coefficient in Manning’s formula is n = 0.012. Find the dimensions of the most economic section of the
channel.
(Solved),Water flows at a uniform depth of 2 m in a trapezoidal channel having a bottom width 6 m, side slopes 2 horizontal to 1 vertical. If it has to carry a discharge of 65 m3/s, compute the bottom slope required to be provided. Take Manning’s n = 0.025.
(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
(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
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