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: