Irrigation Engineering
Pick up the correct statement from the following mention

Gravity water is harmful to crops
Hygroscopic water remains attached to soil molecules by chemical bond
Capillary moisture held in the soil pores against gravity by surface tension, is utilised by plants
All of these

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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
Width of the throat should not be less than one-third of the bed width of main canal
All listed here

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