Irrigation Engineering
For designing the venturi head,

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

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

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