International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(4873) Water requirement, Net water requirement, Total water requirement
The quantity of water, regardless of sources, required by a crop or diversified pattern of crops in a given period of time for normal growth under field conditions. It includes evapotranspiration and some economically unavoidable wastes. It may also be expressed as equal to seasonal consumption plus percolation as may be unavoidable. It is usually expressed in water depth units or depth-area units per unit area. In case part of the water supply (supplementary to precipitation) is from natural or artificial sources situated away from the farm area, the net use, which excludes conveyance losses, is termed `net water requirement`. `Total water requirement` includes conveyance losses.

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