Irrigation Engineering
A land is said to be water-logged if its soil pores within

All listed here
Root zone of the crops are saturated
A depth of 40 cm are saturated
A depth of 50 cm are saturated

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Irrigation Engineering
For designing the venturi head,

All listed here
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

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