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A rectangular channel of 2.5 m width is carrying a discharge of 4 m³/s. Considering that acceleration due to gravity as 9.81 m/s², the velocity of flow (in m/s) corresponding to the critical depth (at which the specific energy is minimum) is ________.
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- 1.5 m/s
- 2 m/s
- 2.5 m/s
- 3 m/s
Correct Option: C
2.45 to 2.55
| y³c = | ||
| g |
| q = | = | = 1.6m³/s/m | ||
| B | 2.5 |
| ∴ yc = | = 0.639 m | |
| 9.81 |
At critical depth,
| ∴ yc = | ||
| 2 |
| = | |||
| 2g | 2 |
∴ V = √0.639 × g = 2.5 m/s
