Abstract
Access to groundwater for use in semi-arid regions is costly due to consistent failures in borehole drilling programs attributable to either a survey not carried out before drilling or incorrectly interpreted geophysical results. Thus, this study aims at delineating the geometry of the shallow weathered crystalline basement aquifer of the Vea catchment, northern Ghana, to aid in the assessment of its groundwater storage potential. Integrated electromagnetic and electrical resistivity surveys within the study area and borehole logs were integrated to delineate the aquifer zones of the study area. The study results revealed the interface between the bedrock and the overlying weathered subsurface as the most transmissive aquifer zone, with the saturated weathered subsurface making up 90% of the total volume of aquifers in the subsurface. The aquifer material in this zone predominantly includes varying proportions of sandy clay and weathered granite, with apparent resistivity ranging from 100 to 500 Ωm in the subsurface. Also, the results indicated that the weathered bedrock interface is irregular, and the water strike zone of the shallow aquifer in the weathered zone mimics the water table and the landscape of the area. Therefore, the study findings could improve the success rate of borehole drilling within the catchment and similar geological terrains.
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Acknowledgements
This work was partly supported by the CSIR-Water Research Institute (WRI), Accra-Ghana. The authors appreciate the management of UPGro and Community Water and Sanitation Agency (CWSA) of Upper East Region of Ghana for data support. We also appreciate Dr. Sebastian Uhlemann, Mr. James Sorensen, and Dr. David M.J. Macdonald for their constructive comments as well as Mr. Samuel Guug and Prof. Rosalind Cornforth for their diverse contributions and motivation. We hereby declare that the content of this article is solely the opinion of the authors based on the field observation.
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CO, EKAA, WAA, and FON: idea conception/design; CO and WAA: organized the field trip; CO and WAA: fieldwork/data analysis; EKAA: verified the data; CO, EKAA, and WAA: data interpretation; CO: wrote the article; FON and WAA: proofread the write-up; EKAA: critically reviewed the article and supervised the research. All authors read and approved the final article.
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Okrah, C., Appiah-Adjei, E.K., Owusu-Nimo, F. et al. Application of electrical and electromagnetic data to delineate shallow aquifer zones: a case study of Vea catchment, Ghana. Arab J Geosci 17, 182 (2024). https://doi.org/10.1007/s12517-024-11987-4
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DOI: https://doi.org/10.1007/s12517-024-11987-4