Uniform flow is possible in which of the following cases?
- Africtionless sloping channel
- Bflow at a channel entrance
- Cflow in the middle of a long prismatic channelCorrect
- Dhorizontal channel
Solution
Concept
Conditions for uniform flow
Step-by-step solution
1. Uniform flow needs a long prismatic channel with a constant slope and roughness, away from the entrance and exit. 2. The middle of a long prismatic channel satisfies this.
Explanation
Gravity balances boundary friction there.
Why the other options are wrong
Frictionless or horizontal channels cannot balance gravity and friction; the entrance is in the developing zone.
Shortcut
Uniform flow: long prismatic, middle reach.
Correct answer: C) flow in the middle of a long prismatic channel