Hydrogeological Characterization of Hard Rock Aquifers in Tropical West Africa Based on Borehole Data: Case of Man Area (West of Ivory Coast)

Koffi Theodore YAO, Franck M. GNAMBA, Koffi Blaise YAO, Moussa OUATTARA

This study was carried out aims to characterize the fractured aquifers by highlighting the level of alteration and to establish the possible links between the boreholes parameters and aquifers productivity in the region. Elementary and multi-varied statistical analyses performed and permitted to correlate borehole parameters with the yields. We noticed that the most productive depths are between 40 and 75 m and a portion of 5 to 30 m section of regolith offers the best flow rates. In addition, the majority of the borehole in the region is into the category of medium flow with high flow rates. The most productive groundwater discharge is located in the first 60 m under the base of regolith. Also, the most productive geological formations providing an excellent flow are the granites. The power of regolith positively influences the productivity of the structures, especially when these saprolite are saturated and permeable enough to release the water they contain in a fractured underlying layer.