Irrigation Engineering
If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be

15 minutes
20 minutes
60 minutes
30 minutes

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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
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
All listed here

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