Groundwater Potential of Basement Aquifers in Part of Southwestern Nigeria
Yinusa Ayodele Asiwaju-Bello, Joy Omowumi Ololade

In this study, water table elevations were monitored weekly in 81 hand-dug wells within Ondo metropolis over a period of four months that cuts across the dry and wet seasons. Some physicochemical parameters of water in the wells were measured weekly. Fifty-two Vertical Electrical Soundings were carried out at chosen locations. Spatial and temporal distributions of saturated thickness of the available aquifers were determined. Recharge conditions were found to dominate central parts of the study area. Generally, three geo-electric layers, which are the Top Soil, Weathered Layer and Fresh Bedrock, are present. The fourth and fifth layers, the Boulder Zone and Fracture Zone, occur in few places. Overburden thickness range from zero at outcrop points to 29.3m in deeply-weathered areas while the saturated thickness of the aquifers varied from 1.49 to 22.76m. Groundwater development is most promising in areas where thick overburden is complemented with presence of fractures.

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