Definition:
Fraction de l’eau de pluie, de la neige fondue ou de l’eau d’irrigation qui s’écoule à la surface du sol et retourne tôt ou tard dans un cours d’eau. Le ruissellement peut se charger de polluants atmosphériques ou terrestres et les transporter jusqu’aux eaux réceptrices.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO. 2008. FAO online glossary