Question

The permissible velocity through the barrels is generally limited to _____________

(a) 1.5 to 2 m/sec

(b) 2 to 3 m/sec

(c) 2.5 to 3 m/sec

(d) 1 to 2 m/sec

This question was addressed to me in my homework.

I'm obligated to ask this question of Cross Drainage Work Design topic in portion Cross Drainage Work of Irrigation Engineering

Answer 1

Correct answer is (b) 2 to 3 m/sec

For explanation I would say: The permissible velocity through the barrels is generally limited to 2 to 3 m/sec. A higher value of velocity requires higher and longer marginal banks since it causes quick abrasion of the barrel surfaces by the rolling grit and results in a higher amount of afflux on the U/s side of the aqueduct.