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15. SEASONAL HYDROGEOPHYSICAL INVESTIGATION OF GROUNDWATER POTENTIAL AND AQUIFER VULNERABILITY PREDICTION IN IJEBU – ODE, SOUTHWESTERN NIGERIA by Coker J. O1., Akpan H.H1., Agbelemoge J.A1. and Atilade A. O Volume 59 (January – March 2021 Issue)
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SEASONAL HYDROGEOPHYSICAL INVESTIGATION OF GROUNDWATER POTENTIAL AND AQUIFER VULNERABILITY PREDICTION IN IJEBU – ODE, SOUTHWESTERN NIGERIA 

Coker J. O1., Akpan H.H1., Agbelemoge J.A1. and Atilade A. O2. 

1Department of Physics, Olabisi Onabanjo University, Ago – Iwoye, Ogun State

2Department of Physical Sciences, Lagos State Polytechnic, Ikorodu, Lagos State

           

Abstract

A Geophysical survey involving Very Low- Frequency Electromagnetic and Electrical Resistivity methods were carried out in Ijebu – Ode, to delineate various aquifer units for evaluating the seasonal effect on groundwater potential. The fieldwork was carried out in the peak of the dry season (March) and wet season (July). The VLF – EM data were acquired during the dry and wet seasons along five traverses with maximum spread length of 500m using the VLF equipment while the 2 – D data were also acquired along the five (5) traverse for both seasons with the aid of ABEM SAS1000 terrameter. The 2 – D Dipole-Dipole data was processed with DIPROWIN software while the VLF – EM data was processed with KAROUS-HJELT software. Results of the VLF – EM data for the dry and wet season’s ranges from -67 to +50 mmhom-1; and from -150 to +157 mmohm-1 The study identified weathered and fractured horizons and both constitute good aquifer zones. The aquifer thickness/depth of weathered basement during the dry season is low, ranging between 5 – 15 m compared with 12 – 25 m for the wet season. Hence, drilling of water should be done during the dry season in other to locate the exact depth of water.

Keywords: Aquifer, Conductivity, Geophysical survey, Lithology, Seasonal effect,

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