SUMMARY
The deterioration report of the groundwater quality brings to act in a preventive way on the pollution of the aquifers. The present study aims to evaluate the role of the fracturing in susceptibility to pollution of the aquifers of the contact zone bedrock-sedimentary basin of southeast of Ivory Coast. A mapping of the vulnerability degree to the pollution of the aquifers using the DRASTIC model, coupled with the distribution of the fractures orientations and the nitrates contents of water drillings was elaborate. The analysis of the map reveals that the strong vulnerability (36%) and average vulnerability (14%) characterize the sedimentary basin whereas the weak vulnerability (21%) and very weak vulnerability (29%) characterize the bedrock. The fractures of varied directions and vectors of groundwater are potentially exposed to various pollutions. Those whose one of these ends is in contact with the sedimentary basin prolong there, thus justifying the fact that the valleys of the sedimentary basin can be interpreted like the subjacent prolongation of principal discontinuities of the bedrock. The assessment or the mapping of this vulnerability degree brings administrators of the resource to be more sensitive to dangers of contamination of the aquifers and also allows them to make enlightened decisions which respect as much as possible the environment.