Which of the following is NOT true for engineering measures such as flood control which bring relief to flood-prone areas by reducing flood flows and thereby the flood levels?
1
An artificially created reservoir in front of a dam across a river.
2
By constructing a parallel channel bye passing a particular town/reach of the river prone to flooding.
3
By diversion of a part of the peak flow to another river or basin, where such diversion would not cause appreciable damage.
4
A natural depression suitably improved and regulated, if necessary.
5
Question Not Attempted