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Les limites sont générées à l\u2019aide d\u2019un système d\u2019information géographique (SIG) à partir des cartes topographiques, de modèles numériques d\u2019élévation et de modèles d\u2019écoulement, et des limites de bassins versants produites par la Direction principale de l\u2019expertise hydrique (DPEH).\n \nL\u2019aire de drainage sert à calculer la superficie drainée en amont de la station d\u2019échantillonnage, à caractériser le territoire drainé (par exemple, pour déterminer l\u2019utilisation du territoire) et à répondre à des besoins spécifiques de cartographie. La classification générale de l\u2019utilisation du territoire a été compilée pour chaque aire de drainage (forestier, agricole, humide, aquatique et anthropique). À noter que le territoire hors Québec n\u2019est pas considéré dans la compilation des pourcentages d\u2019utilisation du territoire. 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