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UPSC Civil Service Exam Questions

Q1: A rectangular channel carries a discharge of 5 m3/s. The channel is 2 m wide. What is the critical depth of the flow ?

A 1.25 m

B 1.07 m

C 0.565 m

D 0.86 m

ANS:D - 0.86 m

For rectangular channels, the critical depth, dc ft (m), is given by dc =[Q2/b2g]1/3.

Where,
dc =critical depth, ft (m).

Q= quantity of flow or discharge, ft3/s (m3/s).

B= width of channel, ft (m).



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