Question

What type of fall does the diagram depict?

(a) Ogee Fall

(b) Trapezoidal Notch Fall

(c) Simple Vertical Drop Type Fall

(d) Straight Glacis Fall

This question was addressed to me in an interview for internship.

The doubt is from Canal Falls topic in section Canal Falls of Irrigation Engineering

Answer 1

Right choice is (a) Ogee Fall

For explanation I would say: The diagram shows that water is gradually led down the convex and concave curves. It also shows the draw down on the upstream side which results in lower depths, higher velocities and subsequent soil erosion. The curves provide smooth surfaces which results in less energy dissipation, which again causes soil erosion. Hence the diagram is ogee fall type.