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

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Irrigation Engineering
Pick up the correct sequence of the part of a canal system from the following

Head works-main canal-branch canal-minor-distributary
Head work-distributary-branch canal-minor
Heads works-branch canal-main canal distributary, minor
Head works-main canal-branch canal-distributary-minor

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