GROUNDWATER EXPLORATION USING RESISTIVITY AND FLOWNET DATA AT THE EASTERN PART OF ILORIN, SOUTHWESTERN NIGERIA

  • D. I. Ajayi
  • Samuel Adebayo
  • S. O. Ajayi
Keywords: Equipotential line, Flownets, Geo-electric layer, Groundwater exploration. IPWIN resist software.

Abstract

Flownets, geo-electric layers construction and groundwater exploration analysis was investigated in the eastern and Western parts of Ilorin of Southwestern Nigeria. Apata-Yakuba, Eleko-yangan, Tepatan, Oke-Andi at the Eastern part and Akamo, Idi-Araba in the Western part of Ilorin were surveyed to depict the exact locations for potential future groundwater exploration. A preliminary step to collect lithologs of wells from the records of Nigeria Hydrological Services Agency used 35 water samples taken from hand dug wells and boreholes. Static water levels, total depth and coordinates of hand dug wells were measured using tape and GPS respectively. The Static water level (below ground surface and above sea level) values and their coordinates were processed using IPWIN resist software to generate the water level locations on topographical contour maps and the groundwater flow net of the study area. Result reflects the presence of crystalline rocks consisting of migmatite gneiss, granite gneiss, quartzite and granite. Analysis and interpretation of flownet shows ascending equipotential lines at the Eastern part indicating an easy groundwater movement, and divergent equipotential lines at the Western part indicating difficulty in water movement in the study area. The static water levels values together with the corresponding coordinates were superimposed on the geological map of the study area. This research reveals the water table is very close to ground surface in Oyun, Oke-Andi resulting into digging of shallow wells by the dwellers of the area. Water table is also far away from the surface in places Tepatan, Apata-Yakuba among others

References

Amadi, A.N.(2010). Hydrogeological and Geophysical Study of Bosso area of Minna, North-
Central Nigeria. Bayero Journal and Mathematical Science, 3 (1): 66-73.

Ifabiyi, I.P. (2013): Impacts of climate change on water resources: Impacts and
adaptation. Sule, B.F. A.A. Adedeji, Ogunlela, O.A.,O.S. Balogun, C.I. Ejieji, and

A.W. Salami (eds.) 63-83 Ilorin National Water Capacity Building Network, North
Central Regional Centre (NWRCBNet-NC)

Ifabiyi, I.P. and Ashaolu, E.D. (2013) Analysis of the Impacts of Rainfall Variability on
Public Water Supply in Ilorin, Nigeria Journal of Meteorology and Climate
Science 11(1) 18-26 Akure. Nigerian Meteorological Society.
http://www.ajol.info/index.php/jmcs/issue/view/10101

Olarenwaju, V.O., Olorunfemi, M. O. and Alade, O. (1996). Chemical Characteristics of
Groundwater from some parts of the Basement Complex of Central Nigeria. Journal
of Mining and Geology.33 (2)135-139.

Olasehinde, P. I. and Taiwo, K.A. (2000). A Correlation of Schlumberger Array Geoelectric
Log with Borehole Lithologic log in South Western part of Nigeria Basement
Complex Terrain.Water Resources Journal, 11: 55-61.

Olasehinde, P.I. and Awojobi, M.O. (2004).Geologic and Geophysical Evidences of a North South Fracture System, East and West of the upper GuraraRiver in Central Nigeria.
Water Resources Journal, 15(1), 33-37.

Olasehinde, P.I. (2010). An integrated Geological and Geophysical Exploration Techniques for Groundwater in the Basement Complex of West Central part of Nigeria. Journal
of National Association of Hydrogeologists (Water Resources), 10(1), 46-49.

Olasehinde, P. I.,Amadi, A. N., Idris-Nda, A., Katu, M. J., Unuevho, C. I. andJimoh, M. O.
(2015). Aquifers Characterization in Agaie, North-Central Nigeria Using Electrical
Resistivity Method and Borehole Lithologs. American Journal of Environmental
Protection 3(3): 60-66.

Olugboye, M.O. (2008). Hydrogeological Practices with Application to Nigeria Groundwater
Terrain,PIOS publications, Ilorin.

Schwarz, S.D. (1986). Application of Geophysical Ground Water Exploration in Tssolt River
Basin. Water Resources Journal, 2:23-28.

Singh, C.L. (1984). Role of Surface Geophysical method for Ground Water Exploration in
Hard rocks areas. In:Proceedings of International workshop on Rural Hydrology
and Hydraulics in fissured Basement Zones, pp59-68.

Sunmonu, L.A.,Adagunodo, T.A., Adeniji, A.A., Oladejo, O.P. and Alagbe, O.A. (2015).
Geoelectric Delineation of Aquifer Pattern in Crystalline Bedrock. Open Transactions
on Geosciences. 2(1) 1–16.
Published
2021-11-03
How to Cite
Ajayi, D. I., Adebayo, S., & Ajayi, S. O. (2021). GROUNDWATER EXPLORATION USING RESISTIVITY AND FLOWNET DATA AT THE EASTERN PART OF ILORIN, SOUTHWESTERN NIGERIA. FUDMA JOURNAL OF SCIENCES, 5(3), 299 - 309. https://doi.org/10.33003/fjs-2021-0503-754