Catchment Feeding Area in Maine-et-Loire(49)

In response to the requirements of the Water Framework Directive, the Water and Aquatic Environments Act of 30/12/06 strengthened the control of diffuse pollution of agricultural origin by introducing the concept of a catchment feeding area (ACA). The catchment foraging area (ACA) is defined on a hydrological or hydrogeological basis. It corresponds to the areas on which the water which infiltrates or flows contributes to the supply of water from which the water is taken. Thus, the AAFC corresponds to: • for a sampling structure intended for drinking water in surface water: to the sub-watershed upstream of the water intake(s), if any, supplemented by the area concerned by the supply of groundwater outside that catchment area (e.g. base tablecloth or accompanying tablecloth of watercourses), • for a sampling structure intended for drinking water in groundwater: to the water supply basin of the water point(s) (the location of the points on the surface of the soil that contribute to the supply of the catchment). The concepts of “foraging area” and “fewer basin” of catchments (AAFC, LAC) are considered synonymous here. The AAFC may concern several sampling works, but the AAFC will be by water category (surface water, groundwater,...) The AAFC does not have a regulatory definition. The AAFC is linked to a single basin administrative district. The basin circumscription will be that of the municipality of the main sampling point of the (reference) sampling structure associated with the AAFC. In addition, SDAGEs define so-called “priority” catchments on which these AAFC definition and associated action plans must be put in place as a matter of priority. In Maine and Loire, 11 catchments are classified as “priority”.为响应《水框架指令》（Water Framework Directive）的要求，2006年12月30日颁布的《水与水生环境法》（Water and Aquatic Environments Act）引入了汇水补给区（catchment feeding area, ACA）的概念，强化了对农业源面源污染的管控。 汇水补给区（ACA）以水文或水文地质条件为依据划定，指通过入渗或径流为取水水源提供补给的区域。据此，农业汇水补给区（Agricultural Catchment Feeding Area, AAFC）的划定规则如下： • 针对地表水饮用水采样设施：对应取水口上游的子汇水区（若存在），并补充该汇水区外为其提供补给的地下水区域（如河道基流补给区或河道附属水域）； • 针对地下水饮用水采样设施：对应取水点的供水盆地，即土壤表层中为该汇水区提供补给的点位所在区域。 此处将汇水区的"补给区"与"低级别汇水盆地"（AAFC, LAC）视为同义概念。 单个AAFC可覆盖多个采样设施，但需按水类别（地表水、地下水等）分别划定。AAFC暂无法定定义，且仅关联单个流域行政区，其流域范围以与该AAFC绑定的基准采样设施的主采样点所在行政区为准。 此外，流域水环境总体规划（SDAGE）划定了所谓的"优先汇水区"，需优先落实此类AAFC的划定及配套行动计划。在曼恩-卢瓦尔区域，已有11个汇水区被列为优先汇水区。