DOI: 10.26650/ijegeo.1872613 ISSN: 2148-9173

Evaluation of Groundwater Potential and Aquifer Protective Capacity of Crystalline Rocks in the Agona East District, Ghana, Using Vertical Electrical Sounding

Victor Agyemang
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In Ghana, the most popular geophysical method for groundwater exploration is the vertical electrical sounding (VES) technique. Although the method has been effectively used in some parts of the country, its effectiveness is limited in other areas. Therefore, assessment of groundwater potential, aquifer protection capacity, and suitability of the VES technique for groundwater exploration in the Agona East District was successfully conducted in this study. The report revealed that the area generally has a moderate groundwater potential and moderate aquifer protective capacity. The study revealed 50% success rate with a drilling depth range of 40.5-90 m and a mean of 69.3 m. The range of borehole yield was 12-50 l/min, with an average of 29 l/min, indicating moderate to high yield within the aquifer zone range of 6-46 m below the surface. The study revealed that the VES is effective in assessing the groundwater potential of the crystalline rocks, as the results agreed with the findings of early studies. However, there was a poor correlation between the geophysical data interpretation and the borehole log data, indicating the limitations of the use of only the VES for exploration in the area. Hence, effective groundwater exploration may be done with the integration of VES and other suitable geophysical techniques.

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