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

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

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Irrigation Engineering
Lacy's regime condition is obtained if

Discharge in the channel is variable
Channel flows in unlimited, incoherent alluvium of the same character as that transported material
Silt grade in the channel is variable
Silt charge in the channel is variable

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