Two Dimensional Shallow Resistivity Investigation of the Ground Water Potential at Nuhu Bamalli Polytechnic, Zaria Main Campus using Electrical Imaging Technique.

A two-dimensional shallow resistivity survey of the groundwater potential at the main campus of Nuhu Bamalli Polytechnic, Zaria using electrical imaging technique was carried out. Six image lines were measured at different strategic locations of the study area based on the fractured map of the area and Borehole log data information obtained from the area. Results from the interpretation of the data collected suggest 2-4 layers in the area studied. However there are patches of core rocks in some part of the studied area. The resistivity value for the first layer (Topsoil) varies from 10 to 400 ohm-m with thickness ranging from 1-14m. The second layer (Weathered Basement) has resistivity values between 120 and 500 ohm-m and thickness ranging from 5-11m. The third layer (Fractured basement) has resistivity values ranging from 500-1000 ohm-m and thickness between 3 and 6m. The fourth layer is the Fresh Basement (Bedrock) has resistivity values greater than 1000 ohm-m and infinite thickness. The southwest (SW) of the study area does represent a promising Aquifer with reasonable thickness of Weathered Basement and Fractured Zone. Also, the area seems to be a zone of high hydraulic conductivity because of its low resistivity values. This area was recommended for possible groundwater exploration as it exhibited strong water-bearing potential in the subsurface rocks.. (Keywords: shallow resistivity survey, ground wate