International Journal of Scientific & Technology Research

Home About Us Scope Editorial Board Contact Us

IJSTR >> Volume 3- Issue 7, July 2014 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

A Further Comprehensive Approach To Assessing The Groundwater Potential Of The Basement Complex Terrain Of Ekiti State, Southwestern Nigeria.

[Full Text]



Bayowa O. Gabriel, Olorunfemi O. Martins, Akinluyi O. Francis, Ademilua O. Lawrence



Keywords: overburden, transmissivity, hydrogeophysical, groundwater, aquifer



ABSTRACT: Hydrogeophysical investigation as well as analyses of hydrogeomorphological, geologic/hydrogeologic, electrical resistivity and borehole data has been carried out in the Basement Complex terrain of Ekiti State, Southwestern Nigeria. This is a second and further step to validate and consolidate on the results from the earlier preliminary approach of Bayowa et’al (2014b) with a view to identifying the hydrogeologic/geoelectric characteristics of the area and classifying the area into different groundwater potential zones. The VES interpretation results were used for aquifers identification; aquifers geoelectric parameter determination and for the calculation of the overburden coefficient of anisotropy for each of the parametric VES. Hydrogeomorphological, lineament density, lineament intersection density and overburden coefficient of anisotropy thematic maps were produced and integrated for the classification of the study area into different groundwater potential zones. The reliability of the groundwater potential map was checked with the existing groundwater yield data. The groundwater yields of boreholes located on quartzitic rocks had a mean of 1.56 l/s while the mean groundwater yield from metasediment (schist) was 1.14 l/s. The study area was characterized into five different groundwater potential zones which are very low, low, moderate, high and very high. Ijelu-Ekiti, Ayede, Ipao, Ikole, Oye. Ayegbaju, Ofale-Ijero and Omuo-Ekiti were classified by very low groundwater potential while low groundwater potential was established in Ijesa-Isu, Iludofin, Iyemero, Esure, Otun, Osi, Iropora, Ifaki, Ikun, Ijero, Ado, Emure and Ise/Orun. Igbara-Odo, Ilawe, Ikogosi, Ido, Ipole-Iloro, Ipere, Ayetoro, Ikoro, Ifisin, Ilogbo, Isinbode, Erinmope and Iwaro fall within moderate groundwater potential zones. High groundwater potential was recorded in Ijan, Okemesi, Aramoko, Ilemeso, Ikere, Etisun and Itawure. Efon-Alaaye and Ilumoba fall within very high groundwater potential zone. The groundwater potential of Ekiti State is generally of very low –moderate level rating. There are however few areas with high to very high groundwater potential.



[1]. Ademilua, O.L. (1997). A Geoelectric and Geologic Evaluation of Groundwater potential of Ekiti and Ondo States, Southwestern, Nigeria. Unpublished M.Sc.Thesis, Dept. of Geology, Obafemi Awolowo University, Ile-Ife, Nigeria. pp. 1- 67.

[2]. Ayoade J..O. (1988). Tropical hydrology and water Resources. Macmillan Publishers Ltd, London and Basingstoke, pp. 5-7, siting Boreholes. Groundwater, 26, pp. 54-63

[3]. Bayowa G.O. Olorunfemi M.O. and Ademilua O.L. (2014a); A geoelectric Assessment and Classification of the aquifer systems in a Typical Basement Complex Terrain: Case study of Ekiti State, Southwestsern Nigeria. Research Journal in Engineering and Applied Sciences 3 (1) 55- 60.

[4]. Bayowa O.G., Olorunfemi, M.O., and Ademilua, O.L. (2014b). Preliminary Geomorphological, Geological Hydrogeological Assessment of the Groundwater potential of Ekiti State, Southwestern
a. Nigeria???

[5]. Carruthers, A.M. and Smith, I.F. (1992). The use of ground Electrical Methods for siting Water Supply boreholes in shallow Crystalline Basement Terrains. In: Wright, E.P and Burgess, W.G. (eds.), The hydrogeology of crystalline Basement Aquifers in Africa. Special Publication 66, Geological Society London, pp. 183-230.

[6]. Dan-Hassan, M.A. (1993). Combined Electromagnetic and Electrical Resistivity Survey for Groundwater development in North Central part of Kaduna State. Unpubli. M.Sc. Thesis, Geology Department, Obafemi Awolowo University, Ile-Ife, Nigeria. pp. 1 – 107.

[7]. Edet, A.E., (1996). Evaluation of Borehole Sites Based on Airphoto Derived Parameters. Bulletin of International Association o f Engineering Geology, vol. 54, pp. 71-76.

[8]. Edet, A.E. and Okereke, C.S., (1997). Assessment of Hydrological conditions in Basement Aquifers of the Precambrian Oban Massif, Southwestern Nigeria. Journal of Applied Geophysics 36 : pp. 195-204.

[9]. Edet, A.E., Teme, S.C., Okereke, C.S. and Esu, E.O. (1994). Lineament Analysis for Groundwater Exploration in Precambrian Oban massif and Obudu plateau. Southeastern Nigeria. Journal of Mining and Geology. Vol. 30, No. 1. pp. 87 -95.

[10]. Lewis, M.A. (1987). The analysis of Borehole yields from Basement Aquifers. Proceedings of the Basement Aquifer Workshop, 15 – 24 June, 1987, Zimbabwe, Commonwealth Science Council CSC (89) WMR – 13, TP 273.

[11]. Mailu, G.M. (1987). Hydrogeology of the Metamorphic Region of the Athi Drainage Area. Kenya. Proceedings of the basement aquifer workshops, 15 – 24 June, 1987, Zimbabwe. Commonwealth Science Council, CSC (89) WMR – 13, TP, 273.

[12]. Mohammed, M..,Z (1992). Geophysical Investigation for Groundwater Development at the Federal University of Technology Campus, Akure. Unpublished. M.Tech. Thesis, Federal University of Tech. Akure. pp. 1 – 203.

[13]. Olorunfemi, M.O. (2008). Voyage on the skin of the Earth: A Geophysical Experience. An Inaugural Lecture delivered at the Obafemi Awolowo University, Ile-Ife, Nigeria, Tuesday, 11th March, 2008, Inaugural Lecture series 211, Obafemi Awolowo University Press Ltd; Ile-Ife. Nigeria. pp. 1-2.

[14]. Olorunfemi, M.O., Olarewaju, V.O. and Alade, O. (1991). On the Electrical Anisotropy and Groundwater yield in a Basement Complex area of Southwestern Nigeria. Journal of African Earth Sciences. Vol. 12, No. 3, pp. 467 – 472

[15]. Olorunfemi, M.O. and Fasuyi, S.A. (1993). Aquifer Types and the geoelectric/Hydrogeologic Characteristics of Part of the Central Basement Terrain of Nigeria (Niger State). Journal of African Earth Sciences, Vol. 16, No. 3, pp. 309 – 317.

[16]. Olorunniwo, M.A. and Olorunfemi, M.O. (1987). Geophysical Investigations for Groundwater in Precambrian Terrains: a case study from Ikare, Southwestern Nigeria. Journal of African Earth Sciences, Vol. 6(6). pp. 787 – 796

[17]. Rahaman, M.A. (1976). Review of the Basement Geology of Southwestern Nigeria. In Geology of Nigeria. Elizabeth publishing Company, Nigeria. pp. 23 -33.

[18]. Rahaman, M.A. (1988). Recent advances in the study of the Basement Complex of Nigeria. In Oluyide et.al. (eds) Precambrian Geology of Nigeria, Publication. Geological Survey of Nigeria, Kaduna, pp. 157-163.

[19]. Salem, H.S. (1999). Determination of fluid Transmissivity and Electric Transverse Resistance for shallow Aquifers and Deep Reservoirs from Surface and Well-Log Electric Measurements. Hydrology and Earth System Sciences, 3(3), pp. 421 – 427.

[20]. Shemang, E.M. (1990). Electrical Depth Soundings at selected well sites within the Kubani River basin, Zaria, Nigeria. Unpublished M.Sc. Thesis, A.B.U. Zaria. pp.108.

[21]. Teme, S.C. and Oni, S.F. (1991). “Delineation of Groundwater flow in Fractured Media through Remote Sensing Techniques to detect Groundwater flow in Fractured Mediain Hard Rock Terrains, some Nigeria cases”. Journal of African Earth Sciences (12)3: 461-466.