The depth of the crest of a scouring sluice below the crest of a head regulator, is generally kept A. 0.20 m B. 1.20 m C. 2.20 m D. 3.20 m

The correct answer is B. 1.20 m.

A scouring sluice is a type of sluice gate that is used to control the flow of water in a channel or river. It is typically located at the bottom of a dam or other structure that impounds water. The purpose of a scouring sluice is to remove sediment that has accumulated in the channel or riverbed. This sediment can reduce the capacity of the channel or river to carry water, and it can also cause flooding.

The depth of the crest of a scouring sluice below the crest of a head regulator is generally kept at 1.20 m. This is done to ensure that the scouring sluice is able to remove sediment that has accumulated in the channel or riverbed. If the scouring sluice is too high, it will not be able to remove sediment that has accumulated at the bottom of the channel or riverbed. If the scouring sluice is too low, it will be

The other options are incorrect because they are not the recommended depth of the crest of a scouring sluice below the crest of a head regulator.