Question

The minimum slope of the chute is governed by the condition that _____________

(a) the subcritical flow must be maintained

(b) the supercritical flow must be maintained

(c) a critical flow must be maintained

(d) maybe supercritical or subcritical flow is possible

This question was addressed to me during an interview for a job.

The doubt is from Chute Spillway topic in division Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

Answer 1

The correct choice is (b) the supercritical flow must be maintained

Explanation: The water flows through the chute channel after spilling over the control structure and the minimum slope is governed by the condition that the supercritical flow must be maintained. The slope should be sufficient to meet the flow requirement from the crest without endangering the stability or heavy excavations.