Definition:
Suppression naturelle ou artificielle de l’eau souterraine et superficielle et des sels dissous retenus en excès dans les terres afin d’améliorer la production agricole. Dans le cas du drainage naturel, l’excès d’eau s’évacue des champs jusqu’aux lacs, marécages, fleuves et rivières. Dans un système artificiel, l’excès d’eau souterraine ou superficielle est éliminé par des canalisations souterraines ou des canalisations de surface.
Source:
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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