INVESTIGATION OF CONCEALED LINEAMENTS FOR GROUNDWATER EXPLORATION AT THE KOGI STATE POLYTECHNIC, OSARA CAMPUS AND ENVIRONS, USING ELECTRICAL RESISTIVITY METHOD
*1 Musa, O.K., 2 Ogbodo, D.A., and 3 Jatto, S. S.,
*Dept of Mineral Resources Engineering, Kogi State Polytechnic Lokoja, Kogi State
Department of Physics, Ahmadu Bello University, Zaria, Kaduna State
ABSTRACT
The electrical resistivity investigation of the Kogi State Polytechnic Lokoja, Osara campus was carried out with a view to providing geophysical information on the different sub – surface layers, depth, nature and thickness, structural trend and distribution of the fractured basement as potential sources of groundwater. Thirty – six vertical electrical sounding stations were established utilizing the Schlumberger electrode configuration. The electrical resistivity data obtained where interpreted using IPI2win (software for interpreting vertical electrical sounding). Results obtained from the interpreted geoelectrical sections indicates the presence of four subsurface layers comprising the top soil, weathered basement, fractured basement and the fresh bedrock. Also, confined and unconfined fracture basement was also noticed within the study area. The weathered basement and the fractured basement constitute the aquifer units. The Isopach maps reveal areas with high basement depressions and zones with basement high. The basement depressions are priority areas for possible groundwater abstraction in the study area. This fractured basement depth ranges from 10-35 metres. The weathered basement indicates high degree of saturation, and may however; fluctuate seasonally due the depth and the clay contents. The depth to the bedrock varies from 8 – 34 metres. Construction or design of foundation structure can also be guided by the depth to bedrock which has been determined.
Keywords: Polytechnic, Osara, Resistivity, Geoelectric