Irrigation Engineering
Lacy's regime condition is obtained if

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

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Irrigation Engineering
A river is said to be of

Aggrading type if it builds up its bed to a certain slope
Meandering type if it flows in sinuous curve
All of these
Degrading type if it cuts its bed to a certain slope

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