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A 10 m wide rectangular channel carries a discharge of 20 m3/s under critical condition

A 10 m wide rectangular channel carries a discharge of 20 m3/s under critical condition

Q. A 10 m wide rectangular channel carries a discharge of 20 m3/s under critical condition. Using g = 9.81 m/s2, the specific energy (in m, up to two decimal places) is             

Ans: 1.10 – 1.20

Sol:

Given: Rectangular channel of width (B) = 10 m, Discharge (Q) = 20 m3/s, and g = 9.81 m/s2

For critical flow in rectangular channel:

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