Irrigation Engineering
In rigid module, the discharge

Is independent of water levels in the distributary and water course
Depends upon the water level in distributary
Depends upon the water level in the water course
Depends upon the water levels of both, i.e. distributary and water course

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Irrigation Engineering
Lacy's regime condition is obtained if

Silt grade in the channel is variable
Silt charge 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

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