Faye Moussa Diagne^1,, Biaou Angelbert Chabi¹, Doulkom Palingba Aimé Marie¹, Koita Mahamadou¹, Yacouba Hamma¹

In Burkina Faso, the use of groundwater in a basement environment represents a major asset for rural populations, due to the questionable quality of surface water. It is exploited through boreholes installed with the help of 1D electrical geophysical investigations. Analysis of the database of 206 boreholes reveals that 30% are negative and 40% are unproductive or have a low flow rate of less than 2.5 m³/h in the study area. This has an impact on the access rate, which was set at 80% in 2015, and which is 71.9% in 2015 and 76.4% in 2020. In view of this observation, in order to define the geometry of the aquifer and productivity, we propose to see whether the methodology (1D) presents certain limitations or difficulties in correlating the lineaments with the preferential water circulation corridors in this type of geological context. Does it also allow us to highlight the thickness and nature of the alteration? To achieve this, remote sensing is used followed by validation. Subsequently, possible correlations between the types of geophysical anomalies and the productivity of the boreholes were identified using a statistical analysis of the 206 boreholes. Geophysical prospecting was used to propose new drilling locations based on fracture directions.

hydrogeology, electrical profile, crystalline basement, remote sensing, water management