Irrigation Engineering
A deep well

is weaker structurally than a shallow well
is always deeper than a shallow well
has more discharge than a shallow well
both (A) and (B)

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Irrigation Engineering
For designing the venturi head,

All listed here
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
Minimum throat width should not be less than 60 cm

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