Журнал географии и стихийных бедствий
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Hydro-geophysical, Aquifer resistivity, Longitudinal Conductance, Transverse Resistance, Imo River Basin

Terhemba Theophilus Emberga

The Imo River Basin lies between Latitudes 4° 38'N and 6° 01'N and between Longitudes 6° 53'E and 7° 32'E and covers an area of about 9100 km2.The litho-stratigraphic units within the study area include the Ajali, Nsukka, Imo Shale, Ameki, Ogwasi and Benin Formations. Regional hydro-geophysical evaluation of groundwater potentials in Imo River Basin has been carried out with the objective of delineating the aquifer units in the area of study. A total of five hundred and sixty-nine (569) Vertical Electrical soundings (VES) were carried out using the ABEMTM Terrameter (SAS) 4000.The VES data were acquired using the Schlumberger electrode configuration with a maximum current electrode spacing of 1000m. Out of the 569 VES data, twenty (20) parametric soundings were done at the vicinity of existing boreholes for correlative and quality control purposes. The acquired VES data were processed using the 1-D WINRESISTTM computer iterative software. Geo-electric curve types interpreted from the study area revealed a predominance of the AK-type with about 3-10 geo-electric layers identified from the various formations. The mean values of aquifer resistivity and conductivity are 1963.2