+1 vote
in Irrigation Engineering by (75.2k points)
What will the discharging capacity of a masonry waste weir of 55 m length and 1.5 m width provided in an earthen bund for passing a flood with 1.2 m water depth over its crest?

(a) 120 cumecs

(b) 254 cumecs

(c) 59.4 cumecs

(d) 65.8 cumecs

This question was posed to me during an interview for a job.

This question is from Tank or Surplus Escape Weirs Design topic in portion River Navigation & Tank Irrigation of Irrigation Engineering

1 Answer

0 votes
by (106k points)
The correct answer is (a) 120 cumecs

The best explanation: The discharge over the weir without any velocity of approach is given by –

Q = C.L H^3/2 where C = 1.66 when the width of rectangular crest > 0.9 m, L is the length of the weir and H is the head of water over the weir.

Q = 1.66 x 55 x 1.23/2 = 120 cumecs.

Related questions

We welcome you to Carrieradda QnA with open heart. Our small community of enthusiastic learners are very helpful and supportive. Here on this platform you can ask questions and receive answers from other members of the community. We also monitor posted questions and answers periodically to maintain the quality and integrity of the platform. Hope you will join our beautiful community
...