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Which weir is now extensively used especially on pervious foundations?

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+1 vote
in Irrigation Engineering by (75.2k points)
Which weir is now extensively used especially on pervious foundations?

(a) Vertical drop masonry weir

(b) Rock-fill weirs with sloping aprons

(c) Concrete weirs with sloping glacis

(d) Non-gravity weirs

The question was asked by my college professor while I was bunking the class.

Query is from Diversion Head Works topic in chapter Diversion Head Works, Hydraulic Jump Usefulness in Irrigation Structure of Irrigation Engineering

1 Answer

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by (106k points)
Correct choice is (c) Concrete weirs with sloping glacis

Easiest explanation: Modern concrete weirs with sloping downstream glacis are generally provided with low crest counter-balanced gates. This is now exclusively used on permeable foundations. Masonry weirs are suitable for hard clay and gravel foundations. Rock-fill weir is suitable for fine sandy foundations.

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