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UPSC Civil Service Exam Questions - Engineering

Q1:

A sewer, 1000 mm in diameter is laid at a slope to obtain a velocity of 0.8 m/s when running full. Assuming Manning's n as constant, what is the velocity in this sewer if it is running half full.

A 0.2 m/s

B 0.4 m/s

C 0.6 m/s

D 0.8 m/s

ANS:D - 0.8 m/s

CASE 1
R=A/P
=D/4.

CASE 2 RUNNING HALF.

R=A/P,
=D/4.

So, the second velocity also be 0.8.