Online Journal of Earth Sciences

Year: 2008
Volume: 2
Issue: 2
Page No. 78 - 85

Hydrogeophysical Evaluation of Federal College of Agriculture, Akure, Campus, Ondo State

Authors : Mogaji Kehinde and Oladapo Ilesanmi

Abstract: The requirement for water usage has increased significantly over the years within the federal college of agriculture, Akure campus because the existing surface water supply scheme has proved inadequate. Electromagnetic (EM) and electrical resistivity studies were conducted within the campus in 4 major areas of human concentration namely; old rural education college (Location 1), academic/male hostel/administrative blocks (location 2), junior staff quarters/female hostel/workshops/sports centre (location 3) and senior staff quarters/ provost lodge (location 4). The aim was to establish the groundwater potential of the locations within the college campus. Very Low Frequency (VLF) data were acquired at 10 m intervals along 21 traverses. Linear features presumed to be fractures inferred from the VLF-EM anomaly profiles were further evaluated using electrical resistivity method. Geoelectric sections generated from iterated sounding curves revealed 4 subsurface geologic layers consisting of topsoil, weathered basement, fractured basement and resistive bedrock. The identified weathered and fractured basement materials constitute the main aquifer units in the area. The isopach map generated revealed areas underlain by thicker overburden materials marked Z1 at location 1, Z2 at location 2, Z3, Z4 and Z5 at location 3 and Z6 and Z7 at location 4. Bedrock relief map revealed that the depressions zones are mostly overlain by relatively thick overburden materials portions while the basement ridge zones are overlain by thin overburden materials. The maps enabled the zoning of the locations into high, medium and low groundwater potential zones. High and medium groundwater potential zones underlie the northeastern area of location 1, central area of location 2, Northeastern, Western and Southeastern areas of location 3 and Southwestern and parts of Southeastern areas of locations 4. Northwestern and Southeastern parts of location 1, Western and Eastern parts of location 2, central parts of location 3 and Northern and Southern parts of location 4 constitute low groundwater potential zones. The VES stations underlain by high and medium groundwater zones in the study locations are viable for groundwater development within the college campus.

How to cite this article:

Mogaji Kehinde and Oladapo Ilesanmi , 2008. Hydrogeophysical Evaluation of Federal College of Agriculture, Akure, Campus, Ondo State. Online Journal of Earth Sciences, 2: 78-85.

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