Question

When the energy is at minimum for flow discharge, it is called _________

(a) Normal depth

(b) Roughness

(c) Critical depth

(d) Hydraulic radius

The question was posed to me by my college professor while I was bunking the class.

My question is from Characteristics of Surface Profiles topic in division Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

Correct choice is (c) Critical depth

Best explanation: Critical depth is defined as the depth at which the energy is at minimum for flow discharge. The flow of profile is classified into three zones for a better understanding. Thus, The correct answer is Critical depth.