Civil Engineering MCQAE Level Civil Engineering
Manning equation for open channel flow: V = (1/n) x R^(2/3) x S^(1/2). For a circular pipe flowing full, the hydraulic radius R equals:
Fluid MechanicsManning EquationMEDIUM
Choose the correct answer
A
D
B
D/4
C
D/2
D
pi x D/4
Correct Answer
B. D/4
Why is this the answer?
For a full circular pipe of diameter D: A = pi x D2/4, P (wetted perimeter) = pi x D, R = A/P = D/4. So Manning: V = (1/n) x (D/4)^(2/3) x S^(1/2).
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