Civil Engineering - Hydraulics - Discussion


An error of 1% in measuring the head of water over the crest of a rectangular weir, produces an error in the discharge which is equal to

[A]. 1.25%
[B]. 1.5%
[C]. 1.75%
[D]. 2.25%

Answer: Option B


No answer description available for this question.

Biswadut said: (Jan 23, 2017)  
dQ/Q = 1.5*dH/H.
Here dQ/Q is the error in discharge of a rectangular weir and dH/H is the error in head.
So here dQ/Q = 1.5%.
In case of the triangular weir equation would be dQ/Q = 2.5 * dH/H.

Laxman said: (Apr 15, 2017)  
Simply 2/3 for rect, 5/2 for triangle.

Clearly said @Biswadut.

Priyanka said: (Aug 17, 2019)  
3/2 for rectangle & 5/2 for triangle.

Deepak said: (Sep 18, 2019)  
Good, thanks @Priyanka.

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