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GROUNDWATER POTENTIAL EVALUATION IN A TYPICAL HARDROCK TERRAIN USING GRRAT INDEX MODEL
Authors: S. BAYODE, T. Y. DOGO &O. JONIBOLA

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Geological and geophysical surveys had been carried out in parts of Alagbaka area, Akure, southwestern Nigeria,
with the aim of evaluating the groundwater potential using the Geology of the study area, Aquifer Resistivity, Bedrock
Relief, Aquifer type and Thickness (GRRAT) index model. Geological and hydro-geophysical data were used to generate
five thematic maps for Geology, Aquifer Resistivity, Bedrock Relief, Aquifer type and Thickness (GRAT) of the aquifer
units in the study area. GRRAT ratings were obtained based upon a calculationof weight and range of each of
the parameters. They were used to develop the GRRAT indexmap ofthe study area. The GRRAT index modelmap
generated for the study area showed that the very low, low, moderate and high groundwater potential zones cover about
15%, 450/0, 35% and 5% respectively of the investigated area. This study concludes that the GRRAT index model can
greatly increase the success rate of drill borehole projects and can also be a useful tool in the decision making process for
groundwater development in a typical hard rock terrain.