Civil Engineering MCQJE Level Civil Engineering
Manning''s formula for velocity in open channels is:
Fluid MechanicsFluid MechanicsMEDIUM
Choose the correct answer
A
V = n·R²/³·S¹/²
B
V = (1/n)·R^(2/3)·S^(1/2)
C
V = n·R·S^(1/2)
D
V = R^(1/2)/(n·S)
Correct Answer
B. V = (1/n)·R^(2/3)·S^(1/2)
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Manning: V = (1/n) R^(2/3) S^(1/2) where n = Manning''s roughness coefficient, R = hydraulic radius = A/P, S = bed slope. Common n values: smooth concrete 0.012–0.014, earthen canal 0.025, natural river 0.035–0.040. Used universally for open channel design.
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