Question

In what limits the slopes of the glacis are provided?

(a) 2:1 to 5:1

(b) 3:1 to 4:1

(c) 5:2 to 6:2

(d) 4:3 to 7:5

This question was posed to me in examination.

This intriguing question comes from Hydraulic Jump in division Diversion Head Works, Hydraulic Jump Usefulness in Irrigation Structure of Irrigation Engineering

Answer 1

The correct option is (a) 2:1 to 5:1

Easiest explanation: The jump is made to happen on the glacis itself because the glacis is taken as a horizontal bed and this makes the position of the jump on the glacis a definite although it is less efficient. So, to make it happen the glacis is provided with the slope from 2:1 to 5:1.