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Abstract
Hydrogeological assessment of groundwater resources of part of Abeokuta area was carried out with a view to highlighting the potential of the aquifers to provide portable water supply, chemical character and provenance of the groundwater resources of the area. Seventy-five Vertical Electrical Soundings (VES) were distributed across areas underlain by different rock types. This was complemented with fifty groundwater samples collected from wells and analyzed for the major ions and seventy two minor constituents. Three to five sub-surface geo-electric layers were delineated from the VES...
Highlights
Appraisal of groundwater resources of Nigeria dated back to as early as 1928 (Offodile, 2002) and over time evaluation of groundwater resources has covered different areas of hydrogeology
High groundwater potential and yield were associated with areas underlain by porphyritic granite and porphyroblastic gneiss, with CaNaHCO3Cl and NaHCO3(Cl) dominant water-type in areas underlain by gneisses and granites respectively
The reflection coefficient combined with the regolith resistivity and their thicknesses as well as lineament trace and other hydrogeological data were integrated and used to evaluate the groundwater potential of the area
Summary
Appraisal of groundwater resources of Nigeria dated back to as early as 1928 (Offodile, 2002) and over time evaluation of groundwater resources has covered different areas of hydrogeology These among many others include geophysical (e.g Olorunfemi et al, 1999; Ako et al, 2005), hydrogeochemical (e.g Tijani, 1994; Tijani et al, 2005; Abimbola et al, 2002) and a few studies have employed some environmental isotopes in groundwater assessment, especially in northern part of Nigeria (Tijani, 2003 & Onugba, 2005). This study, employed geological, geophysical methods complemented with hydro-geochemical data to comprehensively evaluate the occurrences and character of groundwater in Abeokuta and its environs
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