The hydraulic properties of the soil are important parameters in hydrogeology. They allow knowing the characteristics and functioning of aquifers. But their determination is costly and difficult on large sites such as the quaternary aquifer of Abidjan. The objective is to know the hydraulic properties of the aquifer of Abidjan through the study of the porosity and the prediction of saturated hydraulic conductivity by the modified Kozeny Carman's model. The predicted conductivities are compared to those measured in situ by the double rings infiltrability method. The work showed that the porosities ranging from 0.25 to 0.42 while the hydraulic conductivities from 2.10-5 to 5.10-5 m/s. The quaternary aquifer of Abidjan is composed of coarse sand of the marine cordon and medium sand of the lagoon depressions. The coarse sands are found in the southern part of the aquifer while the medium sands in the north part.The application of the modified Kozeny Carman model showed that the predicted conductivities are close to those measured in situ. This model can be used to predict the hydraulic conductivity of the sands of the quaternary aquifer. The model has the merit of using the basic physical properties of the soil easily accessible. It could therefore be applied to other sandy aquifers along of whole eburneo basin of the West Africa.

The prevention against the pollution of groundwater has been over three decades a major concern for the specialists of the field of water. To that purpose, many methods that use intrinsic parameters have been adopted since 1987. For this study, two methods have been adopted to enhance the robustness of results. It is about DRASTIC and SINTACS who use both the intrinsic features of aquifers. The errors margins have been calculated for both maps so as to appreciate their veracity rate. Finally, these maps have been superposed to translate an infiltration on the salts content map which is supped to translate an infiltration from superficial origin. The results clearly indicate that whatever the method, three classes of vulnerability have been identified: the strong vulnerability class, the average vulnerability and the low vulnerability classes. Globally, the area remains moderately vulnerable. Whatever the errors margin that was determined shows the respective values: 16,74 % and 18,04 % for the DRASTIC and SINTACS methods. The superposition of the salts content map shows that the pollutant found in groundwater might have an origin that might not be from a superficial origin infiltration. The use of statistical tests as contribution to this study could lead to determine the origins of these pollutants.