Irrigation Engineering
The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is

greater than 1
equal to zero
less than 1
equal to 1

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Irrigation Engineering
Effective precipitation for a crop may be defined as

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

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