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

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

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Irrigation Engineering
In rigid module, the discharge

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

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