The aim of this research is to carry out hydro geophysical study of Oyo State industrial estate Ogbomosho with a view to determining the areas that are good for groundwater prospects and the areas that are not suitable for groundwater exploration. Vertical Electrical Sounding (VES) method was used to map Oyo State industrial estate Ogbomosho which lies within latitude 08°06' 07.4" and 08°06' 25.4" North and longitude 004° 15' 03.3" and 004°15' 49.0" East of Southwestern Nigeria. Ten Vertical Electrical Soundings (VES) were carried out across the area using the schlumberger electrode array configuration with current electrode separation (AB) varying from 130 to 200 m. Nine out of the ten modeled curves were H-type where the remaining one was KH-type. The geoelectric sections obtained from the sounding curves revealed 3-layer and 4-layer earth models respectively. The models showed the subsurface layers categorized into the topsoil, weathered/clay, fractured layers and the fresh bedrock. The weathered basement and fractured basement are the aquifer types delineated for the area. Flow net and bedrock relief map showed that the Southern, Northeastern and towards the base of Northwestern direction of the study area are good for borehole development.
Water is life because it is one of the inevitable ingredients for life survival. The urge for ground water development is very high in Oyo state Housing Estate, Ogbomosho, Southwestern Nigeria. Because the site is experiencing structural developments and there is no other source of water nearby. Surface water is becoming inadequate, thus this study aimed at investigating the hydro geological prospects of the area with a view to delineating for groundwater and its development. Geophysical investigation was carried out in the study area using Very Low Frequency (VLF) method. VLF profiling of 20 m inter stations and 50 m of inter profiling distances were established. This study revealed a number of conductive zones for ground water development for both domestic and commercial purposes.
Electrical Resistivity method involving Vertical Electrical Sounding (VES) was carried out within the Maga school, Ayeka, southwestern Nigeria. This was carried out with aim of evaluating the protective capacity of the layers overlying the aquifers in preventing pollution from getting to the groundwater resources within the area. A total of twelve Vertical Electrical Soundings (VES) were acquired using the Schlumberger configuration. The half-current electrode spacing (AB/2) of the Schlumberger configuration was varied from 1 to 225 m. The sounding curves derived from the VES data were quantitatively interpreted using partial curve matching and further refined using computer assisted program. From the interpreted geoelectric result, four lithological layers were delineated; the topsoil, the sandy clay, the lateritic sand and the clayey sand/sand. The topsoil resistivity ranges from 89 to 162 Ωm and its thickness varies from 0.9 to 2.0 m, the sandy clay resistivity varies from 215 to 512 Ωm and its thickness ranges from 3.1 to 7.6 m, the lateritic sand resistivity varies from 1025 to 2611 Ωm and thickness ranges from 13.3 to 23.9 m and the clayey sand/sand resistivity ranges from 183 to 522 Ωm with a depth range from 19.7 to 30.4 m. The protective capacity map revealed that all the parts of the study area fall within a weak protective capacity zone. This is informed by the low longitudinal conductance which suggests a weak protective capacity rating. As a result of this, the study area is therefore vulnerable to pollution if it is exposed to contaminant sources which could come from septic tanks, underground petroleum storage tanks, industrial waste and landfills.
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