Irrigation Engineering
The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called

Syphon
Super passage
Super-aqueduct
Syphon aqueduct

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Irrigation Engineering
Which one of the following statements is correct?

All listed here
The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream
The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land
The canal system and the drainage system are complementary

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