Question

In case of designing a sarda type fall the shape of the crest has one boundary level.

(a) False

(b) True

This question was addressed to me during an internship interview.

My query is from Canal Falls topic in portion Canal Falls of Irrigation Engineering

Answer 1

The correct choice is (b) True

The explanation: When the discharge level is under 14 cumecs rectangular crest is used. The top width is 0.55√d and base width is (h+d)/G (G = 2 for masonry). If the discharge is more than 14 cumecs then trapezoidal crest is used. Top width is equal to 0.55\(\sqrt{(H+d)}\) with upstream slope is 1: 3 and downstream slope is 1 : 8.