『Abstract
　Sustainable development requires the management and preservation of water resources indispensable for all human activities. When groundwater constitutes the main water resources, vulnerability maps therefore are an important tool for identifying zones of high pollution risk and taking preventive measures in potential pollution sites. The vulnerability assessment for the Eocene aquifer in the Moroccan basin of Oum Er-Rabia is based on the DRASTIC method that uses seven parameters summarizing climatic, geological, and hydrogeological conditions controlling the seepage of pollutant substances to groundwater. Vulnerability maps were produced by using GIS techniques and applying the “generic” and “agricultural” models according to the DRASTIC charter. Resulting maps revealed that the aquifer is highly vulnerable in the western part of the basin and areas being under high contamination risk are more extensive when the “agricultural” model was applied.

Keywords: Vulnerability; Water resources sustainability; DRASTIC; GIS; Morocco』

Introduction
Site presentation
Methodology of the aquifer vulnerability assessment
Parameters of vulnerability to the pollution
　The depth to water (D)
　The recharge (R)
　The aquifer media (A)
　The soil media (S)
　The topography (T)
　The vadose zone media (I)
　The aquifer permeability (C)
　The aquifer vulnerability maps
Conclusion
Acknowledgments
References