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Question
Among weirs used in open flow meteorology, critical depth of the flow is the relevant criterion in:
A.
Broad crested weir
B.
Cippoletti weir
C.
Parabolic weir
D.
Sharp-crested weir
Answer ( Option A)

Broad crested weir

Solution

Critical depth of flow is relevant criterion only for broad crested weir among the options. This is because in broad crested weir, flow tries to adjust itself to a critical state always with the head over weir being one third of the head of water upstream.

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