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UPSC Civil Service Exam Questions - Engineering

Q1:

What is the normal depth in a wide rectangular channel carrying 0.5 m3/s discharge at a bed slope of 0.0004 and Manning's n = 0.01 ?

A 0.13 m

B 0.32 m

C 0.43 m

D 0.50 m

ANS:C - 0.43 m

If dimension are not given then;

Formula=(1/n) x( y ^5/3) x(s^1/2)= discharge;
.5/2 = y^5/3,
.25^3/5 = .435.