Irrigation Engineering
A counter berm is

A vertical benching provided on the inner edge of the bank
A vertical benching provided on the outer edge of the bank
A horizontal benching provided on the inside slope
A horizontal benching provided on the outside slope

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Irrigation Engineering
A deep well

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

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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
All listed here
Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal

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