Question

In which fall the depth discharge relationship is unaffected?

(a) Trapezoidal Notch Fall

(b) Ogee Fall

(c) Rapids

(d) Straight Glacis Fall

The question was asked by my college professor while I was bunking the class.

This interesting question is from Canal Falls topic in chapter Canal Falls of Irrigation Engineering

Answer 1

The correct choice is (a) Trapezoidal Notch Fall

The explanation is: In this fall the notches could be designed to maintain the normal water depth in the upstream channel at any two discharges, as the intermediate values do not vary much. Therefore the depth discharge relationship of the channel is not affected by the introduction of the fall.