Assessment of Groundwater Potential within Nasarawa State University Keffi, Nasarawa State.

Vertical Electrical Sounding (VES) were carried out within Nasarawa State University Keffi Main Campus with a view to determine the groundwater potential zone. The Schlumberger electrode configuration was employed in all the points. The current electrode separation C1C2/2 was from lm to 100m, while the potential electrode separation P1P2/2 ranges from 0.25m to 5m, in determining the subsurface layering, overburden thickness and depth to water bearing formations. Results from the sounding data was analyze using computer iteration software (IPI2win) to interpret the sounding curves and produce two dimensional resistivity imaging of the survey with colors showing variation in resistivity and thickness of the layers. The study area is generally underlain by four geoelectric layers which include topsoil (Lateritic sand), Weathered Basement (Sands, silts and clay) which in turn are refer to as regolith, Fractured Basement (which constitute cracks filled with sandy materials) and Fresh Basement (crystalline Basement rocks). Based on the result obtained the weathered and the fractured Basement makes the aquiferous zone within the study area. The resistivities of these zones vary from 156.1 Hm to 193.3£kn while the thickness varies from 11.51m to 35.90m. Depth to these zone ranges from 18m to 67m. Therefore the research conclude that, with the dominancy of H-type curves distribution within the study area, this shows that the area under studied is highly to moderately prolific in terms of groundwater potentials.