Comparative Study of the Hydrodynamic and Hydrochemical Characteristics of the Guitry and Zikisso Aquifers in the Gôh Region (Central-Western Côte D’Ivoire)

This study focused on comparing the hydrodynamic properties and hydrochemical characteristics of groundwater in Guitry and Zikisso, in the Gôh region (central-western Côte d’Ivoire), in order to assess the sustainability of drinking water supplies. On the one hand, the drilling database was analyzed and processed using analytical solutions for determining hydrodynamic properties such as Theis and Cooper-Jacob. The data relating to the physical and chemical parameters were analyzed and then processed using the DIAGRAMMES hydrochemical software developed by the Hydrogeology Laboratory at the University of Avignon (France). This tool allows the chemical classification of groundwater to be represented graphically using standard diagrams (Piper), based on the mineral ion composition of the water. In Guitry, the aquifers are mainly confined (80%) and formed by several layers of fissures. In Zikisso, the aquifers are exclusively confined (100%) and have the same shape. The aquifers in Zikisso are more productive, with a specific yield of 1.24 m2/h (compared to 0.44 m2/h). The average depth of the boreholes reached 107.74 m and 99.10 m in Zikisso and Guitry, respectively. All groundwater samples were identified with the same facies: calcium with magnesium and bicarbonate type (Ca2+, Mg2+, HCO 3 − ), indicating silicate hydrolysis as the only mineralization process that occurred and, probably, high connectivity of the fractured aquifers. These results highlight the importance of prior hydrodynamic and hydrochemical characterization to achieve sustainable groundwater management in the context of bedrock aquifers.