Geo-Appraisal of Groundwater Resource for Sustainable Exploitation and Management in Ibulesoro, Southwestern Nigeria

Groundwater exploitation requires better understanding of the resource availability and quality/vulnerability. Geophysical techniques, pumping test, hydraulic measurement, borehole logging quality test analysis have been used in Ibulesoro, southwestern Nigeria, to hydrogeological system terms groundwater availability, aquifer delineation, evaluate physico-chemical biological contents. The study utilized multi-criteria evaluation techniques (GWPIV) assess overall potential/vulnerability. geology area comprises granite, migmatite, migmatite gneiss, biotitic gneiss. main water-bearing unit was weathered layer fractured basement, which are usually unconfined aquifer. conductivity formation factor is related by y = 0.239e0.0519x with correlation coefficient 0.0961. average transmissivity 0.52 m/d 5.78 m2/d respectively. parameters viability increases southwardly, just as movement/flow due south. thickness overburden 8.6 m 16.1 respectively, dominant resistivity range 80 – 200 ohm-m. best drilling points (migmatite/gneiss geologic units) where basement underlies most not necessarily exceed 30 - 35 m. depth rock obtained GWPIV varied from 1.12 1.71, an 1.30 suggesting low potential but good for drinking irrigation uses its present state, however highly vulnerability contamination, vadose zone (5.68 avg.), AVI (0.57 LC (0.0818 mhos avg.) all point protective capability. water types mixed Ca-Mg-Cl. mechanism controlling falls zone, indicates contribution soil/rock-water interaction, precipitation, evaporation; while carbonic weathering more active than silicate process.