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28. GEOELECTRICAL INVESTIGATION OF THE IMPACT OF THE USE OF INJECTION WELL TO CONTROL FLOOD AT IHAMA ROAD, BENIN CITY, NIGERIA by Okanigbuan P.N. and Alile O.M. Volume 52 (July & Sept., 2019 Issue)
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GEOELECTRICAL INVESTIGATION OF THE IMPACT OF THE USE OF INJECTION WELL TO CONTROL FLOOD AT IHAMA ROAD, BENIN CITY, NIGERIA

Okanigbuan P.N. and Alile O.M.

Department of Physical Sciences, Benson Idahosa University Benin City, Nigeria.

Department of Physics, University of Benin, Nigeria.

Abstract

The well injection is located at Ihama Road, by military hospital and there are over 45 boreholes inside the injection well. The purpose of the use of injection well is to control flood but because the well is almost drilled to the aquifer and is covered with just wire gauze, it becomes a concern to geophysicists as the suspected plumes are migrating. The subsurface imaging was done by engaging the dipole dipole configuration using PASI Earth Resistivity Meter. The Vertical Electrical Sounding (VES) was done by engaging the Schlumberger configuration using Petrozenith terrameter to determine the depth to the aquifer. The 1-Dimensional results from Military hospital showed that the depth to aquifer is 100m.  Low resistivity values were seen in the Inversion Images of 2-D Resistivity Profiles, which could be as a result of the presence of contaminant plumes from the well injections. In addition, the Hydrophysicochemical analysis was carried out which further proved that the area of study has been contaminated. The study has proved that the use of injection well to control flood is a direct contamination on groundwater in the study area, instead good drainage system should be adopted or flood should be channelled to a nearby river.

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