Definition:
The natural or artificial removal of surplus ground- and surface water and dissolved salt from the land in order to enhance agriculture production. In the case of natural drainage the excess waters flows from the fields to lakes, swamps, streams and rivers. In an artificial system surplus ground or surface water is removed by means of sub surface or surface conduits.
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO/IPTRID, 2001, Drainage and Sustainability, Issues Paper 3, October 2001, & D. Zimmer et al, 2001, Global Drainage Status and Needs, CEMAGREF