Groundwater Potential and Hydrochemical Facie Characterization in Obangede, North-Central, Nigeria
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Schlumberger array of Vertical Electrical Sounding (VES) for groundwater exploration and drilling of fifteen (15) water wells in Obangede, Kogi state have been carried out with a view of establishing differences in subsurface geoelectric layers and characteristics of aquifer units. Six (6) water samples were also analyzed to characterized hydrochemical facies of groundwater for the purpose of drinking and irrigation. Curve matching with the Orellana Mooney master curves and 2-D forward modeling with IPI2WIN software was use to interpret subsurface layering while Piper plot, Gibb diagram and Kelly ratio were used to classify groundwater facie and suitability for drinking and irrigation purpose. Generally, the VES revealed H-type curves with 3-4 geoelectric layers. Depths between 12 and 48m represent areas of low resistivities which constitute prospective zone for water exploitation. Thickness of overburden ranges between 7 15m, fracture depths range between 24 and 55m while boreholes yield range between 0.3 and 5.5. Physico-chemical analyses showed that pH values range between 6.8 and 7.5 and a dominant CaHCO hydrochemical 3 facie having rock weathering activities as the major source of ions. All samples plotted within the zone of very good of Wilcox diagram while Kelly ratio gave average value of 0.12, indicating the suitability of water samples for irrigation purpose. Comparison of the groundwater samples with the World Health Organization and Standard Organization of Nigeria showed that they are suitable for human consumption.
Publication Info:
Author: Ige O.O.
Volume: 50
Issue: September
Published By: Journal of Mining and Geology, 2024-09-01