When FSL of the canal is sufficiently below the bottom of the drain, so that water flows freely under gravity, such structures is called_____________________?
Correct answer: B. Super-passage
- A. Syphon
- B. Super-passage
- C. Syphon - Aqueduct
- D. Canal-syphon
Explanation
In a super-passage, the drain passes over the canal while the canal flows freely under gravity below the drain bed. If the canal instead flowed under pressure, the structure would be called a canal siphon.
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