Irrigation Engineering
The uplift pressure on the roof of an inverted syphon, is maximum when

Drain in running dry
Canal is running with F.S.L.
Drain is running with H.F.L.
Canal is running dry

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Irrigation Engineering
Effective precipitation for a crop may be defined as

Total precipitation during the crop period
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

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