Irrigation Engineering
When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called

Super passage
Syphon-aqueduct
Aqueduct
Syphon

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Irrigation Engineering
Effective precipitation for a crop may be defined as

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

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