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Irrigation - Engineering

Q1:

Retrogression of the bed level of a river downstream a weir, occurs due to

A heavy impact of water

B increase of the bed level

C less percentage of silt

D soft soil strata.

ANS:C - less percentage of silt

After construction of barrage, the water flowing through the barrage have less silt, so water picks up silt from downstream bed. This results in lowering d/s river bed to a few miles. This is known as retrogression.