Irrigation Engineering
The runoff increases with

increase in intensity of rain
All of these
increase in infiltration capacity
increase in permeability of soil

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Irrigation Engineering
For designing the venturi head,

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

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