Irrigation Engineering
Regime conditions in a channel may occur if

All listed here
Discharge is constant
Channel flows uniformly in incoherent alluvium as that transported in suspension
Silt grade and silt charge are constant

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Irrigation Engineering
For designing the venturi head,

Width of the throat should not be less than one-third of the bed width of main canal
All listed here
Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
Minimum throat width should not be less than 60 cm

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