A GIS-Based Drastic Model for Assessing Aquifer Vulnerability in Amman-Zerqa Groundwater Basin, Jordan

Abdulla M. Al-Rawabdeh, Nadhir A. Al-Ansari, Ahmed A. Al-Taani, Sven Knutsson

Department of Civil, Environmental and Natural Resources and Engineering, Lule? University of Technology, Lule?, Sweden.
Department of Geomatics Engineering, University of Calgary, Alberta, Canada.
UNESCO Chair for Desert Studies and Desertification Control, Yarmouk University, Irbid, Jordan.

DOI: 10.4236/eng.2013.55059                

Abstract

Amman-Zerqa Basin (AZB) is a major basin in Jordan. The concentration of economic, agricultural and social activities within the basin makes it of prime importance to Jordan. Intensive agricultural practices are widespread and located close to groundwater wells, which pose imminent threats to these resources. Groundwater contamination is of particular concern as groundwater resources are the principal source of water for irrigation, drinking and industrial activities. A DRASTIC model integrated with GIS tool has been used to evaluate the groundwater vulnerability of AZB. The Drastic index map showed that only 1.2% of the basin’s total area of 3792 km² lies in the no vulnerable zone and about 69% is classified as having low pollution potential. The results also revealed that about 30% of the catchment area is moderately susceptible to pollution potential and slightly 1% is potentially under high pollution risk. These results suggest that almost one third of the AZB is at moderate risk of pollution potential. These areas are mainly in the north-east and central parts of the basin where the physical factors (gentle slope and high water table) would allow more contaminants to easily move into the shallow groundwater aquifer. Areas with high vulnerability to pollution are largely located in the center of Amman old city.

Keywords

Amman-Zerqa Basin; Jordan; GIS; DRASTIC

Conflicts of Interest

The authors declare no conflicts of interest.

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