The EU Cooperation in Science and Technology (COST) Action 620 Group approach is applied to evaluate the risk of groundwater contamination of a karstic aquifer located southeast of Mexico, to get information of potentially threatened areas. Subsurface contaminant loads, the aquifer vulnerability, as well as, the interaction between them are considered to define the aquifer risk to contamination. The hazard and risk indexes are calculated from an inventory of contaminant sources, creating their maps using geographic information system. Under the COST 620 approach, any method can be used to analyze aquifer vulnerability to contamination and new ones can be developed. This allows to model the karst groundwater vulnerability to contamination in the study area, applying a modified version of the DRASTIC method, where considerations are given to hydraulic conductivity and land use, as parameters in the model. The results indicate a more conservative differentiation when compared to similar studies carried out in the study area with the moderate vulnerability class occupying the greatest extent. Areas of high hazard and risk are in the main urban areas.

中文翻译：

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COST Action 620方法：应用于墨西哥东南部喀斯特含水层

欧盟科学技术合作（COST）行动620组方法用于评估位于墨西哥东南部的岩溶含水层的地下水污染风险，以获取有关潜在威胁地区的信息。地下污染物负荷，含水层脆弱性以及它们之间的相互作用被认为定义了含水层受到污染的风险。危害指数和风险指数是根据污染物来源清单计算得出的，并使用地理信息系统创建了它们的地图。在COST 620方法下，可以使用任何方法来分析含水层对污染的脆弱性，并可以开发新的方法。通过使用DRASTIC方法的改进版本，可以对研究区域内的喀斯特地下水易受污染的脆弱性进行建模，其中考虑了水力传导率和土地利用，作为模型中的参数。结果表明，与研究区域进行的类似研究相比，保守程度的差异更大，中等程度的脆弱性类别所占比例最大。高危险和高风险地区位于主要城市地区。