Abstract
In order to evaluate the risk of contamination of the groundwater resource in the city of Villavicencio, the hydrogeological conceptual model was revised and the vulnerability of the aquifer and the polluting load that can affect it were studied. In the development of the hydrogeologic conceptual model was characterized the climatological, geological, hydrogeological, hydraulic, and hydrogeochemical factors in the area of study, as well as the hydric balance which allows to estimate the input and output volumes in the system. This characterization allows to establish the aquifer as a phreatic, granular aquifer, constituted by conglomeratic deposits of the Pliocene-Quaternary sequence, where the groundwater flows from west to east. Once defined the hydrogeological conceptual model, the aquifer’s vulnerability was evaluated with the DRASTIC method, where it’s clear a low-high vulnerability distribution, from NW to E. Concerning to the hazard, it was classified by the load contaminant index for four potentially contaminant activities: urban development, industrial activities, environmental accidents, and livestock production, which showed low and moderated hazard in all the cases. Applicating the Geographic Information Systems, (GIS), the hazard and vulnerability maps were cross-analyzed obtaining four risk maps. In that way the risk variation from low to high was identified in each one of the activities defined as potentially polluting.
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