Question

Consider the following statements regarding a gradually varied flow in a prismatic open channel.

Which of the above statements are correct?

• A. 2 and 3
• B. 2 and 4
• C. 1 and 2
• D. 1 and 4

Answer 1

The correct option is B 2 and 4

The gradually varied flow in a prismatic channel, depth of flow changes over large length and specific energy is constant.
Assumption of G.V.F.:
(1) Chezy’s formula and Manning's formula are used to determine energy slope.
(2) Energy correction factor $\left(\alpha \right)$ = 1
(3) Pressure distribution is hydrostatic.
(4) The bottom slope of the channel is very small.
(5) Flow is steady i.e. discharge is constant.
(6) Roughness coefficient of the channel is independent of depth.