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

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

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Irrigation Engineering
The intensity of irrigation means

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

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