When the high flood level of the drain is sufficiently below the bed of the Canal that the drainage water flows freely under gravity, such structure is called___________________?
Correct answer: A. Aqueduct
- A. Aqueduct
- B. Syphon-aqueduct
- C. Cross-Drainage
- D. Non-gravity structure
Explanation
An aqueduct carries the canal over the drain, allowing the drainage water to pass below freely under gravity. If the drain had to flow under pressure, the structure would be a siphon-aqueduct.
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