Question

Drainage relief pockets are provided ___________

(a) at isolated locations in the bed as well as sides of the lined canal

(b) in the bed of the canal

(c) in the sides of the canal

(d) anywhere in the canal

The question was asked during an online exam.

I need to ask this question from Canal Lining topic in division Lining of Irrigation Canals and its Economics of Irrigation Engineering

Answer 1

Right choice is (a) at isolated locations in the bed as well as sides of the lined canal

To explain: Drainage relief pockets are provided with pressure relief valves filled with a graded filter containing gravel, coarse sand, and fine sand. They are provided at isolated locations in the bed as well as on the sides below the lining at suitable spacing (@ 15 to 20 m intervals).