Abstract

Geo-Electrical Analysis of data obtained from Vertical Electrical Sounding (VES) measurements conducted in Ado-Ekiti has been carried out to demarcate groundwater pockets in the metropolis within the Basement Complex of Southwest, Nigeria. 49 ‘vertical electrical soundings’ were carried out. The layer parameters of resistivity and thickness were determined and used to generate spatial distributions of relevant geo-electric parameters including overburden thicknesses, the bedrock relief and the weathered basement thickness/resistivity. The depth – to – bedrock varied from 3.8 to 56.2 m with a mean of 21.04 ± 14.62 m. The weathered basement has resistivity values ranging from 6.5O to 1214 Ω-m with weathered basement thickness ranging from 3 to 39.5 m. The basement rocks were observed to be variably fractured. Groundwater potential zones such as valley fills/basement depressions, weathered zones and fractured zones were delineated in the study area based on the geoelectrical data.

Key words: Groundwater, geoelectric, saprolite, bedrock, basement.