(b) Determine the dimensions of the most economic section of a trapezoidal channel to carry a discharge of $15 \mathrm{~m}^{3} / \mathrm{s}$ at a slope of 1 in 4000 having side slopes 1 vertical to 2 horizontal. Assume Manning's $\mathrm{n}=0.015$.
Explanation
The most economic section of a trapezoidal channel can be determined using the Manning equation. The given values are used to calculate the cross-sectional area, hydraulic radius, and top width of the channel.
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