Irrigation Engineering
The useful moisture of soil, is equal to its

Moisture content at permanent wilting point
Saturation capacity
Difference between filed capacity and permanent wilting point within the root zone of plants
Field capacity

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Irrigation Engineering
In rigid module, the discharge

Depends upon the water level in distributary
Depends upon the water level in the water course
Depends upon the water levels of both, i.e. distributary and water course
Is independent of water levels in the distributary and water course

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