Consider the following statements regarding uniform flow in channel : 1. The depth of flow and wetted area are constant at every section along the channel reach. 2. The velocity of flow and discharge are varying along the channel reach. 3. The total energy line, water surface and the channel bottom are all parallel. Which of the above statements is/are correct ?
- A1 and 2
- B2 and 3
- C3 only
- D1 and 3Correct
Solution
Concept
Characteristics of uniform flow
Step-by-step solution
1. Depth and area are constant along the reach (true). 2. Velocity and discharge are also constant (statement false). 3. Energy line, water surface and bed are parallel, with Sf = Sw = S0 (true).
Explanation
In uniform flow the flow properties do not change with distance, so velocity and discharge cannot vary.
Why the other options are wrong
Statement 2 is false.
Shortcut
Uniform flow: Sf = Sw = S0.
Common mistake
Accepting statement 2.
Correct answer: D) 1 and 3