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In Broad Crested Weir formula, the discharge is dependent on ________________

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+1 vote
in Irrigation Engineering by (75.2k points)
In Broad Crested Weir formula, the discharge is dependent on ________________

(a) upstream water depth only

(b) downstream water depth only

(c) both upstream and downstream water depth

(d) independent of both U/s and D/s water depth

I have been asked this question in a dream while sleeping

Origin of the question is Small Road Bridges Construction topic in portion Culverts and Small Road Bridges Construction of Irrigation Engineering

1 Answer

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by (106k points)
The correct option is (a) upstream water depth only

The best explanation: When the afflux is less than 1/4 D/s depth, there is no effect on the discharge or on the U/s depth due to the formation of the standing wave. The discharge is only dependent upon U/s depth and is independent of D/s depth. It is applicable only when afflux is more than 1/4 of D/s.

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