Question

What number of major defects does the ogee fall have?

(a) 1

(b) 2

(c) 3

(d) 4

This question was addressed to me in an interview.

I would like to ask this question from Canal Falls topic in chapter Canal Falls of Irrigation Engineering

Answer 1

Correct choice is (b) 2

Explanation: Ogee fall has two major defects. Heavy drawdown occurs on the upstream side, which results in lower depths, higher velocities and bed erosion. The kinetic energy of the flow will not be dissipated due to smooth transition, causing erosion on downstream bed and banks.