Abstract
It is widely recognized that groundwater-vulnerability maps are a useful tool for making decisions on designating pollution-vulnerable areas, in addition to being a requirement of European Directive 91/676/EEC. This study addressed the vulnerability of the Mancha Oriental System (MOS) to groundwater contamination with an integrated Generic and Agricultural DRASTIC model approach. In the MOS, groundwater is the sole water resource for a total population of about 275,000 inhabitants and for 1,000 km2 of irrigated crops. DRASTIC vulnerability maps have been drawn up for two different years (1975 and 2002) in which the potentiometric surface has dropped dramatically (80 m in some areas) due to the considerable expansion of irrigated croplands. The quality of available resources has also deteriorated due to the agricultural practices and the discharge of wastewater effluents. Vulnerability maps are used to test the data on nitrate, sulphate, and chloride contents in groundwater in the Central and El Salobral-Los Llanos hydrogeologic domains of the MOS for 2002. Regardless of the method applied, the dramatic alteration in land use leads to a change in the DRASTIC index and vulnerability to groundwater contamination decreases for the study period. Vulnerability in the MOS increases in areas where the irrigation return flow is notable. The lack of a statistical correspondence between the DRASTIC index and the spatial distribution of nitrate, chloride, and sulphate contents and the distribution of the pollution load suggest that this method does not accurately assess the risk of the MOS to groundwater pollution.
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Acknowledgements
This study is part of the Ph.D. Thesis of Angel Moratalla and David Sanz and was funded by the research projects PAC08-0187-6481 and PEIC11-0135-8842 of the Consejería de Educación y Ciencia de la Junta de Comunidades de Castilla-La Mancha (JCCM), and research agreements among the JCCM, Albacete City Council, and the Univerity of Castilla-La Mancha (UCLM). Special thanks go to Dr. Alfonso Calera and Mr. Mario Belmonte from the Remote Sensing and GIS Group of the Institute for Regional Development (IDR) of the UCLM for providing the crop classification for the study area. We would like to thank Christine Laurin for improving the English text. The authors would also like to thank the anonymous reviewers for their contributions in improving the manuscript.
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Moratalla, Á., Gómez-Alday, J.J., Sanz, D. et al. Evaluation of a GIS-Based Integrated Vulnerability Risk Assessment for the Mancha Oriental System (SE Spain). Water Resour Manage 25, 3677–3697 (2011). https://doi.org/10.1007/s11269-011-9876-0
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DOI: https://doi.org/10.1007/s11269-011-9876-0