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GATE Exam Questions

Q1: A circular sewer 2 m diameter has to carry a discharge of 2 m3/s when flowing nearly full. What is the minmum required slope to initiate the flow ? (Assume Manning's n = 0.015)

A 0.00023

B 0.000036

C 0.000091

D 0.000014

ANS:C - 0.000091

Q=A*V, here Q is given, from here we can find.
V=2/3, and we know V=1/n*R^2/3*S^1/2.
we can find R=1/2, by putting all the value we get,
S = 0.00023 so A is the correct answer.



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