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A hydraulic jump occurs in a rectangular, horizontal, frictionless channel. What would be the pre-jump depth if the discharge per unit width 2 m3 /s/m and the energy loss is 1 m?
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- 0.2 m
- 0.3 m
- 0.8 m
- 0.9 m
Correct Option: B
| yc = |  |  | 1 / 3 | = | | | 1 / 3 | = 0.74 | ||
| g | 9.81 |
| = y1y2(y1 + y2) | ||
| g |
| = | = 0.815 | |
| 9.81 |
| ∆E = | = 1 m | |
| 4y1 y2 |
By trial and error, we get 0.3 m.
