Abstract

Chukwudi C. Ezeh

This report discusses the occurrence of groundwater in Enugu State, Nigeria, as indicated by results of 322 vertical electrical soundings(VES), supplemented by 123 well records. The project area lies within Longitudes 7° 6’ E - 7° 54’E and Latitudes 5°56’N- 6 °52’N, and covers an area of about 7161km2 over eight main geological formations. The thickness, lateral extent and transverse resistance of the aquiferous layers were determined by the electrical survey. Water table information from borehole records was used to construct regional maps of static water level depths and groundwater flow directions. The results show greater depth of the substratum in the central part of the study area as indicated by high transverse resistance and thickness of the aquiferous layers. Lower average values of these parameters were obtained in the southwestern and eastern parts of the study area. Specific discharge and average linear groundwater velocity follow similar trend, generally improving from the western and eastern parts to the central part of the study area. Regional maps of the various geoelectrical and hydrogeological parameters have been produced and the overall results have been used to delineate the study area into five groundwater potential zones for future development and choosing of drilling sites.