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UPSC Civil Service Exam Questions

Q1: The discharge per metre width at the foot of a spillway is 10 m3/s at a velocity of 20 m/s. A perfect free hydraulic jump will occur at the foot of the spillway when the tail water depth is approximately equal to

A 4.50 m

B 5.00 m

C 5.50 m

D 6.50 m

ANS:D - 6.50 m

@All.
Discharge = velocity x area.
area= width x height.
In question discharge per meter width is given as 10 cms, therefore,
Unit width discharge = velocity x height.



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