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Estimation of groundwater reserve in unconfined frequently exploited depth of aquifer using a combined surficial geophysical and laboratory techniques in The Niger Delta, South – South, Nigeria

George, N.J, Obianwu V.I. and Obot, I.B

Twenty-three profiles of vertical electrical soundings (VES) were obtained in the Niger Delta area of Nigeria, to estimate the usable capacity of groundwater reserve and the flow direction. The combination of the VES data, borehole data and laboratory analysis provided useful information on subsurface hydrogeologic conditions as well as quantitative description of the geometry of the exploitable aquifer in the study area. The resistivity and aquifer thickness were used to generate litho- and hydro-resistivity cross sections within the area. The static water levels measured in wells were also used to predict the flow direction while a surfer software programme helped a great deal in combining the porosity data from laboratory analysis and surface geoelectric data in estimating the natural groundwater reserve in the survey area.