Irrigation Engineering
If there are two canals taking off from each flank of a river, then there will be

two divide walls and two undersluices
one divide wall and one undersluice
one divide wall and two undersluices
two divide walls and one undersluice

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Irrigation Engineering
The intensity of irrigation means

Percentage of gross commanded area to be irrigated annually
Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
Total depth of water supplied by the number of waterings
Percentage of culturable commanded area to be irrigated annually

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