Application of vertical electrical sounding (VES) for groundwater exploration in Onitsha and environs, Nigeria
Keywords:Aquifer, Aquifer Characteristics, Geoelectric Layer, Onitsha and Vertical Electrical Sounding.
Surface geo-electrical survey using vertical electrical sounding (VES) method has been carried out in Onitsha and environs in southwestern part of Anambra state in order to determine the aquifer characteristics and groundwater potential of the area. Eleven vertical electrical soundings were carried out within the area of study using schlumberger array configuration. The interpretation of the vertical electrical sounding (VES) data revealed three to five geoelectric units with depth to the aquiferous layers ranging from 21 to 78m and resistivity of the saturated layers varying between 20 and 5600 ohm-m. Aquifer characteristics such as transmissivity and hydraulic conductivity calculated from interpretated VES result ranged from 2.55m2/day to 29.01m2/day and 0.03m/day to 1.37m/day respectively. This result shows that the water saturated sandstone units of the study area is hydrological good and capable of producing optimum groundwater yield. Furthermore, borehole could be drilled at depth between 40 and 110m in the area for sustainable water supply and hydrochemical study carried out to determine the water quality for domestics and municipal purposes.
 Anizoba, D. C. Chukwuma, G. O., Chukwuma, E. C., & Chinwuko, E. C. (2015). Determination of Aquifer Characteristics from Geo-electrical Sounding data in parts of Anambra State, Nigeria. International Journal of Innovation and Applied Studies, 11 (4), 832-843.
 Anakwuba, E. K., Nwokeabia, C. N., Chinwuko, A. I., and Onyekwelu, C.U. (2014). Hydrogeophysical assessment of some parts of Anambra basin, Nigeria. International Journal of Advanced Geosciences, 2 (2), 72-81.
 Anudu, G.K., Onwuemesi, A.G., Ajaegwu, N.E., Onuba, L.N., and Omali, A.O. (2008). Electrical resistivity investigation for groundwater in the basement complex terrain: a case study of idi-ayunre and its environs, oyo state, southwestern Nigeria. Natural and Applied Sciences Journal, 9 (2), 1-11.
 Burke, K. C., (1996). The African Plate. South African Journal of Geology, 99, 341-409.
 Driscoll, P. F. G., (1986). Groundwater and wells (2nd Ed.). New York: Johnson division.
 Ehinola, O. A.; Sonibare, O. O.; Falode, O. A and Awofala, B. O. (2005). Hydrcarbon Potential and Thermal Maturity of Nkporo Shale from Lower Benue Trough, Nigeria.
 Ekwe, A. C.; Onu, N. N. and Onuorah, K. M. (2006). Estimation of aquifer hydraulic characteristics from electrical sounding data: The case of middle Imo River Basin aquifer, Southeastern Nigeria. Journal of spatial hydrology, 6 (2), 23-30.
 Emenike, E. A. (2000). Geophysical Exploration for Groundwater in a Sedimentary Envrionment: A case study from Nanka over Nanka Formation in Anambra Basin, Southeastern, Nigeria. Global Jour. of Pure and Applied Sciences, 7 (1), 97-110.
 Emenike, E. A. (2001). Geophysical Exploration for Groundwater in a Sedimentary Envrionment: A case study from Nanka over Nanka Formation in Anambra Basin, Southeastern, Nigeria. Global Jour. of Pure and Applied Sciences, 7 (1), 56.
 Ezeh, C. C. (2011). Geoelectrical studies for estimating aquifer hydraulic properties in Enugu State, Nigeria. International Journal of the Physical Sciences, 6 (14), 3319-3329.
 Ezeigbo, H. I. and Obiefuna, G. I. (1995). An evaluation of the groundwater resources of Ogbunike area, Anambra state, Southeatern, Nigeria. Water Resources Journal of Nigeria of Hydrogeologist, 2, 31-41.
 Murat, R. C., (1972). Stratigraphy and Paleogeography of the Cretaceous and lower Tertiary in Southern Nigeria in: Dessauvagie, T. F. J. (Ed.)
 Nwajide, C. S. and Reijers, T. J. A., (1996). Geology of the Southern Anambra Basin in Reijers,T. J. A.; (Ed.), Selected chapters on geology.
 Niwas, S. and Singhal, D. C. (1981). Estimation of aquifer transmissivity from Da-zarrouk parameters in porous media, Journal of hydrology, 50, 393 â€“ 399. http://dx.doi.org/10.1016/0022-1694(81)90082-2.
 Obi, G. C.; Okogbue, C. O. and Nwajide, C. S., (2001). Evolution of the Enugu Cuesta. A tectonically driven erosional process. Global Journal of Pure Applied Sciences, 7, 321-330. http://dx.doi.org/10.4314/gjpas.v7i2.16251.
 Okoro, E.I., Egboka, B.C.E., Onwuemesi, A.G. (2010). Evaluation of the aquifer characteristics of Nanka Sands using hydrogeological method in combination with vertical electrical sounding. Journal of Applied Sciences, 14 (2), 5 â€“ 9. http://dx.doi.org/10.4314/jasem.v14i2.57822.
 Onwuemesi, A G, Egboka, B.C.E. (2006). 2-D polynomial curve fitting techniques on water table and hydraulic gradients estimations in parts of Anambra Basin, Southern Nigeria. Natural and Applied Applied Sciences Journal, 8 (1& 2), 6-13.
 Oseji, J.O. and Ujuanbi, O. (2009). Hydrogeophysical investigation of groundwater potential in Emu kingdom, Ndokwa land of Delta State,Nigeria. International Journal of Physical Sciences, 4 (5), 275-284.
 Onuoha, K. M., and Mbazi, F. C. C. (1988). Aquifer transmissivity from electrical sounding data. The case of Ajali Sandstone aquifers, Southeast of Enugu, Nigeria. In: Ofoegbu C. O.; (Eds), Groundwater and mineral resources of Nigeria, Friedr. Vieweg and John Publishers. http://dx.doi.org/10.1007/978-3-322-87857-1_3.
 Reyment, R. A. (1965). Aspects of the Geology of Nigeria. Ibadan: University of Ibadan Press.
 Singh, K. P. (2005). Nonlinear estimation of aquifer parameters from surfical resistivity measurements. Hydro. Earth Sci. Discuss, 2: 718-726.
 Soupios, P. M.; Kouli, M.; Vallianatos, F., Vafidis, A. and Stavroulakis, G. (2007). Estimation of aquifer hydraulic parameters from surficial geophysical methods: A case study of Keritis Basin in Chania (Crete- Greece).Journal of Hydrology, 338: 122â€“131. http://dx.doi.org/10.1016/j.jhydrol.2007.02.028.
 Todd, D., (1980). Groundwater hydrology. New York: John wiley and sons Inc.
 Whiteman, A. J. (1982). African Geology. Ibadan: University of Ibadan Press, Nigeria.
 Wright, J. B., (1968) South Atlantic Continental drift and the Benue Trough. Tectonphysics, 6 (4), 301-310. http://dx.doi.org/10.1016/0040-1951(68)90046-2.
 Zhody, A. R.; Eaton, G. I. and Masay, D. R., (1974). Appilcation of subsurface geophysics to groundwater investigation. Technical water resources investigation, Washington Geological Survey.
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