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Question

# Consider the following statements regarding the conditions to be satisfied for the maximum discharge through a trapezoidal channel section with slope 1: n, bed width b, flow depth d, and having a fixed bed slope: 1. Sloping sides should have an angle of 300 with vertical. 2. Hydraulic mean depth equals half the flow depth. 3. Length of sloping sides should be equal to twice the bottom width. Which of these statements are correct?

A
2 and 3
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B
1 and 2
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C
1 and 3
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D
1, 2 and 3
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Solution

## The correct option is B 1 and 2(b) The hydraulically efficient trapezoidal channel is half-hexagon. The length of sloping sides will be equal to the bottom width. The sides will 600angle from horizontal and 300 with vertical.

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