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[This article belongs to Volume - 57, Issue - 05]

Abstract : This study focuses on the application of the new method, GALDIT, for the cartography of aquifer vulnerability due to seawater intrusion in the sub-watershed of Saf Saf (Skikda). The method was developed by Chachadi and Lobo-Ferreira in 2001 after that modified in 2005 and is specific for coastal aquifers. The computing of the GALDIT is based on six parameters: Groundwater occurrence (aquifer type); Aquifer hydraulic conductivity; Depth to groundwater level above the sea; Distance from the shore (distance inland perpendicular from shoreline); Impact of existing status of seawater intrusion in the area; and Thickness of the aquifer. This GALDIT is the indicator scores and summing them and dividing by the total weight for determining the relative role of each one. We utilized Geographic Information System (GIS) for this purpose. The results of this study show a vulnerability of the aquifer to the seawater intrusion with a high risk in the fringe littoral areas. Therefore, continuous monitoring of the water quality in this area is necessary.