New-Aquitaine: Areas vulnerable to pollution by nitrates of agricultural origin in the Adour-Garonne basin — Perimeters (surface)

This dataset contains restricted areas (surface objects) of vulnerable areas. A vulnerable area is a part of the territory where water pollution by direct or indirect discharge of nitrates of agricultural origin and other nitrogen compounds that may become nitrates threatens in the short term the quality of aquatic environments and, in particular, the supply of drinking water. Vulnerable zones shall be designated as areas where: — surface and groundwater fresh waters, in particular those intended for drinking water, have a nitrate content exceeding 40 mg/l, — estuary waters, coastal or marine waters and surface fresh waters which have undergone or show a tendency to eutrophication which can be effectively combated by reducing nitrogen inputs and having a nitrate content exceeding 18 mg/L. The list of municipalities or parts of municipalities in the Adour-Garonne district classified as vulnerable areas is drawn from the annex to Prefectural Decree No 2012-574 of 31/12/2012.本数据集收录脆弱区域（vulnerable area）的受管控地表目标。其中，脆弱区域是指领土范围内因直接或间接排放农业源硝酸盐（nitrates）及其他可转化为硝酸盐的含氮化合物（nitrogen compounds）而引发水污染，且短期内将威胁水环境质量、特别是饮用水供应的区域。 符合以下条件的区域应被划定为脆弱区域： — 地表淡水与地下淡水（尤其是用作饮用水源的水体），其硝酸盐含量超过40mg/L； — 河口水域、近岸海域及海洋水域，以及已发生或存在富营养化（eutrophication）趋势的地表淡水，且此类水体可通过减少氮输入有效防控富营养化，同时硝酸盐含量超过18mg/L。 阿杜尔-加龙（Adour-Garonne）辖区内被划定为脆弱区域的市镇或市镇部分区域的清单，源自2012年12月31日发布的第2012-574号省长令（Prefectural Decree）附件。