Irrigation Engineering
Pick up the correct statement from the following mention

Hygroscopic water remains attached to soil molecules by chemical bond
Gravity water is harmful to crops
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
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
All listed here

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