Many investigation techniques are commonly employed with the aim of estimating the spatial distribution of transmissivity. Unfortunately, the conventional methods for the determination of hydraulic parameters such as pumping tests, permeameter measurements and grain size analysis are invasive and relatively expensive. A geoelectric investigation involving vertical electrical sounding was carried in parts of Enugu town, Enugu state, Nigeria. The survey was aimed at extrapolating the result of pumping tests over an area. Using the Dar Zarrouk parameter, a β constant of 0.32 was found to translate resistivity to transmissivity with clay content as the primary factor controlling the hydraulic conductivity. Results of the study show a strong correlation between aquifer transmissivity and longitudinal conductance (R 2 = 0.82). Estimation of aquifer transmissivity values based on the results of the resistivity measurements also made it possible to demarcate area with good groundwater potential in parts of Enugu town, Nigeria.

Hydrogeochemical assessments were carried out in the vicinity of Okpara coal and Obwetti fireclay mines, Enugu, Nigeria to investigate the hydrogeochemical characteristics and constituents of shallow groundwater. A total of 12 representative shallow groundwater samples were collected and analyzed for major cations and anions as well as trace metals like Fe and Mn. Distribution of major ions in these groundwater samples was calculated and the general trend among cations and anions was found to be Ca ? Na ? Mg ? K and SO 4 ? NO 3 ? Cl ? HCO 3 , respectively. This means that water moving through the ground will react to varying degrees with the surrounding minerals (and other components), and it is these rock-water interactions that give the water its characteristic chemistry. Piper trilinear diagrams classified the hydrogeochemical facies into Ca-Mg-Cl, Ca-Fe-Mg-SO 4 and Ca-Mg-Na-K-Cl-SO 4 water types. Ratios of Cl to Na, K and Mg generally increased compared to those of Cl to Ca and SO 4 which decreased indicating ion adsorption/ exchange processes due to the dissolution of drainage materials. The aquiferous units mainly in the northwestern region of the study area yield water of better quality than those toward the southeastern region.

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