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Home  >  Volume 35

Geophysical and Hydrological Investigation of Groundwater Condition: A Case Study of St. Finbarr’s College Akoka, Yaba, Lagos by Olorode D.O. and Akintunde O.A.(pages 491-498)
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Coastline cities are known to be adversely affected by saltwater intrusion (SWI), a condition which can be worsened if not properly addressed. Groundwater on the other hand, plays a major role in satisfying water requirements in Lagos coast due to the fact that the region is geographically isolated. Geophysical survey methods were used to investigate saltwater intrusion into coastal aquifer of lagoon environs of St. Finbarr’s College. Schlumberger and Wenner resistivity methods were used to acquire data. The subsurface structure composed mainly of sandy-clay, clayey-sand, clay and sand. Results show that saline water intrusion which is characterized by seawater penetrating the subsurface in contact with the lagoon was prevalent in the area. The VES and CST results correlate to a very high degree, indicating saltwater intrusion between depth intervals of 12.5m and 55.4m in the study area which is verified by chemical analyses of the water sampled. Increasing concentrations of major anions and cations of wells at shallow depth suggests that the area is prone to continuous infiltration from the lagoon. It was also observed that all the water samples contained high concentration of Iron and low in Sodium.

Keywords: Continuous infiltration, Geochemical analysis, Saltwater intrusion, Subsurface structure.