Abstract
A dc-electrical resistivity investigation of Oke-Ila area was carried out with a view to delineating fractured zones within the crystalline basement rocks. The electrical resistivity survey involved vertical electrical soundings at twenty five locations using ABEM SAS 1000 terrameter. The results of the investigation revealed three distinct geoelectric layers: top soil, weathered layer and fractured/fresh crystalline basement rocks. Fractured zones with high aquifer potential were delineated as resistivity lows against the background resistivity highs of the fresh basement rocks. The study revealed that the fractured zones which constitute the productive water bearing zones are discontinuous (localized) and they occur at an average depth of 37.5m.
Highlights
Aba PanuIdiawewe VES 24 exploitation of groundwater in basement terrains requires proper understanding of geo-hydrological characteristics
Introduction groundwater water qualityDelineation of fractured zonesGroundwater is ubiquitous and immensely important in crystalline bedrock is of prime importance in for human uses but there is inadequate supply especially groundwater investigations in this terrain due to the fact in the basement complex terrain as most boreholes are that the groundwater within the fractured bedrock occurs either abortive or cannot yield sustainable water to wells. at greater depths and is protected from near surfaceOke-Ila lies within the Precambrian basement terrain contaminants
Field observations have shown that aquifers in crystalline basement terrains are highly localized and are mainly controlled by weathered regoliths and secondary porosities developed from fractures and joints (Adelusi et al, 2000; Bala & Ike, 2001; Abdullahi, 2005; Olasehinde & Raji, 2007)
Summary
Idiawewe VES 24 exploitation of groundwater in basement terrains requires proper understanding of geo-hydrological characteristics. Detailed geophysical investigations precede drilling programmes for groundwater development in these terrains. The aquifers within the weathered unconsolidated materials overlying the basement rocks often occur at shallow depths, and the people living in these areas
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