Contribution à la compréhension du fonctionnement hydrogeologique du système aquifère dans le bassin du Kou (Burkina Faso)

Located at the South of the town of Dioulasso sore, economic capital of Burkina Faso, the basin of the Kou consists of sandy, carbonated and clayed formations dated from the Precambrian one. These formations constitute materials of four aquifers formations whose geometrical characteristics and the interactions with the rivers and the important sources of Nasso (10.000 m3/h) and Pésso (600 m3/h) remain complex and badly known. In order to provide a better comprehension of the hydrogeology of this vast basin of 1860 km2, the present study was initiated. For the needs for the study, the limits of the Kou basin were extended to its natural borders: the Mouhoun river in North-Western and the cliff of Banfora in the South-East. The four aquifers formations considered as a single hydrogeological unit, were modelled considering steady state groundwater flow conditions. Modeling made it possible to understand the interactions groundwater -water of surface by quantifying exchanged water flows. The results provided by this model appear acceptable in comparison of the allowed assumptions, and the data we have used.