Question

Which type of canal need syphons?

(a) Side Slope Canal

(b) Contour Canal

(c) Watershed Canal

(d) Field Channel

This question was addressed to me in an internship interview.

This is a very interesting question from Canal Irrigation System topic in section Canal Irrigation System of Irrigation Engineering

Answer 1

Right answer is (c) Watershed Canal

Explanation: The alignment of watershed canal should run in areas where there homes, sacred places etc, and does not run in loops of the ridge line but run in straight. So, for these depressions in the ridge line necessitates construction of viaducts or syphons to maintain the canal fixed supply level.