Civil Engineering MCQAE Level Civil Engineering
For maximum discharge in a circular pipe flowing partly full (not full), the depth of flow that gives maximum discharge is approximately:
Fluid MechanicsHydraulic Radius Max FlowMEDIUM
Choose the correct answer
A
0.5D (half full)
B
0.81D
C
0.94D
D
Full (D)
Correct Answer
C. 0.94D
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For a circular pipe, maximum discharge occurs at depth = 0.94D (94% full), not when completely full. This is because at 0.94D, the product A x R^(2/3) is maximum. At full flow, the increased wetted perimeter reduces velocity enough to lower Q.
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