Irrigation Engineering
The main function of a divide wall is to

provide smooth flow at sufficiently low velocity
control the silt entry in the canal
separate the undersluices from weir proper
prevent river floods from entering the canal

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Irrigation Engineering
In rigid module, the discharge

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

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