Catchment feeding areas

The catchment feeding area (CFA) is defined on a hydrological or hydrogeological basis. It corresponds to the areas on which infiltrating or run-off water contributes to the supply of the water resource from which the sample is taken. Thus, the AAC corresponds to: - for a sampling structure intended for drinking water in surface water: the sub-watershed upstream of the water intake(s), possibly supplemented by the area concerned by the supply of groundwater from outside that watershed (e.g. basement or stream accompaniment tablecloth), - for a sampling structure intended for drinking water in groundwater: the supply basin of the water point(s) (place of the points on the ground surface which contribute to the supply of the catchment). The concepts of ‘feeding area’ and ‘feeding basin’ of catchments (AAC, BAC) are here considered to be synonymous.流域补给区（catchment feeding area, CFA）基于水文与水文地质条件定义，指入渗水或径流水对所采样本所属水资源产生补给贡献的区域。 因此，AAC的范围如下： - 针对以地表水为取水水源的饮用水采样设施：为取水口上游的子流域，可补充纳入该子流域范围外的地下水补给区域（例如基岩或沿河补给带）； - 针对以地下水为取水水源的饮用水采样设施：为取水点的补给盆地，即对该取水设施的补给作出贡献的地表点位所在区域。本文中将流域补给区（catchment feeding area, CFA）与流域补给盆地（basin of catchment, BAC）视为同义概念。