A clean-earth trapezoidal channel with a bottom width of 1.8 m and a side surface slope of

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A clean-earth trapezoidal channel with a bottom width of 1.8 m and a side surface slope of 1:1 is to drain water uniformly at a rate of 8 m3/s to a distance of 1 km. If the flow depth is not to exceed 1.2 m, determine the required elevation drop.

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