Definition:
A systematic review of inflow, outflow and storage as applied to the computation of groundwater changes. It is based on the concept that all inputs of water in a defined space and time are equal to the sum of all outputs of water, and the changes of water storage, in the same space and time.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO/IPTRID/ICID/ODA, 2000, Irrigation Guidelines, Land and Water Digital Media Series 12, & FAO, 2000, Handbook on Pressurized Irrigation Techniques