Question

10) When Yn > Yc and So > 0, it is called a _____

(a) Adverse

(b) Horizontal

(c) Critical

(d) Mild

The question was posed to me in an online interview.

My doubt is from Relation between Water Surface Slopes and Channel Bottom Slopes in portion Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

Correct option is (d) Mild

To explain: When Yn > Yc and So > 0, it is called a mild slope. Mild slope is denoted by ‘M’. This is a bed slope that has 3 zones with a different set of conditions. This slope occurs most commonly in the back water curve.