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Aquifer
vulnerability assessment at Oke-Ila area, Southwestern
Nigeria
Aweto, K. E.
Department of Geology, Delta State University, Abraka,
Nigeria.
E-mail:
kizaweto@yahoo.com.
Accepted 02 November, 2011. |
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Twenty Five Schlumberger depth sounding data from Oke-Ila
and environments, Southwestern Nigeria was interpreted to
delineate the aquifers. The geoelectric parameters of the
uppermost layer across the area were used to assess the
vulnerability of the underlying aquifers to the surface and
near-surface contaminants. The aquifer in the area is
located mostly within the weathered layer above the basement
rock and occurs at a shallow depth ranging from 3.9 to 15.7
m, where depths less than 8 m constitute 52% of the study
area. The average depth to the aquifer is 8.6 m. The
protective capacity of the overburden showed that 60% of the
study area has poor protective capacity, 12% weak protective
capacity and 28% moderate protective capacity. This suggests
that aquifers within the weathered basement rock are prone
to surface and near-surface contaminants.
Key words:
Intrinsic, aquifer, vulnerability, saprolite. |
