Definition:
Assessment of, with the help of observed data or other known procedures of calculation, an overall picture of the extent (in time and space) and dependability of water supplies (surface and ground) and the character of water of a river basin, region or country on which an evaluation of the opportunities for its control and utilization is to be based.
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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