Hydrogeoelectrical evaluation of groundwater flow pattern in a Basement Complex terrain, Southwest Nigeria

Hydrogeoelectrical evaluation of groundwater flow pattern in a Basement Complex terrain, Southwest Nigeria

Omowumi AdemilaBlessing Saloko 

Department of Earth Sciences, Adekunle Ajasin University, Akungba-Akoko, Nigeria

Corresponding Author Email: 
28 January 2018
07 February 2018
31 March 2018
| Citation



Heavy reliance on groundwater for potable water and increasing groundwater contamination from human activities in Supare Akoko has prompted this research work. The study examined the pattern of groundwater movement by combining hydrogeologic measurements and electrical resistivity survey in the area in order to identify the groundwater converging centres and to locate appropriate dumpsites. The hydrogeologic measurements involved static water levels measurement of 40 hand-dug wells while the electrical resistivity investigation involved a total of 40 geoelectric soundings using the Schlumberger electrode configuration. The results of the hydrogeologic measurements were presented as maps of 3-D surface elevation, static water elevation, groundwater head and groundwater vector. These maps revealed that groundwater flows from central, western and southeastern regions to the southwestern and northeastern parts of the area. Two types of aquifer, which are the weathered layer aquifer and weathered/fractured (unconfined) aquifer with resistivity values of 62 – 332 Ωm and 207 – 989 Ωm respectively, were delineated from the geoelectric parameters of the study area. Aquifer layer resistivity map revealed that groundwater flow directions are from the west and north into other parts of the area, towards the southwestern and northeastern parts. The values of the aquifer characteristics obtained were in the range of 2.88 – 437.4 m2/day for transmissivity, 1.2 – 40.5 m/day for hydraulic conductivity and 0.001 – 0.016 mS/m for electrical conductivity. The distribution of transmissivity values suggests the state of different aquifer systems in the area. These values when compared with international standards showed that the water in the aquifer is of high quality and yield from which long pumping can be maintained due to its capacity to regain water within a short period of time. A water scheme is proposed in the groundwater converging centres of the area to provide enough water for the people in the area. It is therefore recommended that dumpsites should be placed within the southern parts of the area in order to avert groundwater contamination. The inhabitants of the town must also be enlightened on the importance of ensuring a clean and hygienic environment around the source of their water to avoid associated health problems.


hydrogeologic measurement, electrical resistivity, groundwater flow pattern, groundwater head, transmissivity, aquifer

1. Introduction
2. Description of the Study Area (Geology and Hydrogeology)
3. Materials and Methods
4. Determination of Aquifer Parameters from VES Results
5. Results and Discussion
6. Conclusion

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