Question

What is the condition for a normal depth?

(a) Water depth remains a constant

(b) Temperature of fluid remains a constant

(c) Pressure of fluid remains a constant

(d) Isentropic and adiabatic flow

The question was posed to me in a national level competition.

This intriguing question comes from Characteristics of Surface Profiles in portion Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

The correct choice is (a) Water depth remains a constant

For explanation: Normal depth is a depth of flow in the channel. It is created when the slope of the water surface and channel bottom is the same and the water depth remains the same throughout the entire flow.