Civil Engineering MCQAE Level Civil Engineering
In a broad-crested weir under free-flow conditions, discharge is controlled primarily by:
Fluid MechanicsOpen Channel FlowMEDIUM
Choose the correct answer
A
downstream channel roughness only
B
upstream head over the crest
C
specific gravity of the weir material
D
air temperature above the channel
Correct Answer
B. upstream head over the crest
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For a broad-crested weir flowing freely, critical flow occurs near the crest and discharge is governed mainly by the upstream head over the crest.
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