Irrigation Engineering
A hydraulic jump is generally formed when a stream moving with

A sub-critical velocity meets a stream moving with a hyper-critical velocity
A hyper-critical velocity meets a stream moving with a hyper-critical velocity
A hyper-critical velocity meets a stream moving with a critical velocity
A hyper-critical velocity meets a stream moving with a sub-critical velocity

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Irrigation Engineering
Effective precipitation for a crop may be defined as

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
Total precipitation minus the loss due to evaporation

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