Irrigation Engineering
The length and width of a meander and also the width of the river, vary roughly as

Discharge
Square of the discharge
Cube of the discharge
Square root of the discharge

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

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