Question

When So is equal to zero, it is called________

(a) Adverse

(b) Horizontal

(c) Critical

(d) Mild

The question was posed to me at a job interview.

I would like to ask this question from Relation between Water Surface Slopes and Channel Bottom Slopes topic in section Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

The correct choice is (b) Horizontal

The best I can explain: When So is equal to zero, it is called Horizontal slope.  It is denoted as H. The bed slope follows the manning’s equation to solve for its normal depth. It is always equal to zero.