Permissible velocity of water flowing through concrete lined tunnel is usually __________________?
Correct answer: B. 4 - 5m/sec
- A. 3 - 4m/sec
- B. 4 - 5m/sec
- C. 5 - 6m/sec
- D. 6 - 7m/sec
Explanation
Concrete lining reduces seepage and protects the tunnel from erosion, allowing a relatively high permissible velocity. A usual design range is about 4 to 5 m/sec.
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