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What is the name given to the first effect...

What is the name given to the first effect created by the construction of a weir?

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asked Aug 19, 2023 in Irrigation Engineering by Carter (75.2k points)

What is the name given to the first effect created by the construction of a weir?

(a) Crest Damage

(b) Afflux

(c) Scouring

(d) Retrogression

This question was posed to me during an interview.

My question is from Design of Modern Weirs and Barrages in chapter Seepage Theories and Weirs and Barrages Design of Irrigation Engineering

irrigation engineering
seepage theories and weirs and barrages design
design of modern weirs and barrages

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answered Aug 22, 2023 by Greg (106k points)

Correct option is (d) Retrogression

The explanation is: Whenever a weir is constructed the first effect will be that the downstream bed of the river goes on eroding, continuously causing a progressive lowering of downstream levels. So, therefore this progressive lowering of downstream levels is known as retrogression of downstream levels or retrogression.

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