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

Syphon aqueduct
Syphon
Super passage
Super-aqueduct

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Irrigation Engineering
Effective precipitation for a crop may be defined as

Total precipitation minus the loss due to evaporation
Total precipitation minus the loss due to infiltration
Available water stored in soil within root zone of the crop
Total precipitation during the crop period

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