INVESTIGATION FOR GROUNDWATER AT THE PERMANENT SITE OF THE FEDERAL POLYTECHNIC NASARAWA, NASARAWA STATE, NIGERIA.
INVESTIGATION FOR GROUNDWATER AT THE PERMANENT SITE OF THE FEDERAL POLYTECHNIC NASARAWA, NASARAWA STATE, NIGERIA.
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Date
2007-01
Authors
OGA, FIDELIS ADZE
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Abstract
A geophysical survey was carried out in the Federal Polytechnic
Nasarawa and the process of electrode layout employed was the
Schlumberger array which was applied in the vertical mode. The
maximum current electrode separation was 300m. Fourty - six vertical
electrical sounding surveys were carried out, with six of these being
radially sounded in three directions oriented at 60° to each other
(azimuthal sounding). Data analysis using zohdy software was applied.
Analysis showed that the area comprised of four subsurface
layers. The first which is the top layer is lateritic while the second layer
is strongly weathered. The second layer constitutes the aquifer zones
in the area having relatively low resistivity range of 30 - 2 0 0m . The
depth to basement varies at different locations and areas of shallow
basement or high resistivities can serve as good locations for the
erection of buildings. The variation in the depth to the basement
indicates that the basement profile is not a smooth continuous surface
but an undulating surface. The average depth to basement was found
to be 33 meters and this suggests that the depth to basement in the
survey area is generally shallow.
Analysis of the azimuthal sounding surveys showed that the
subsurface of the survey area is generally anisotropic. It is therefore
recommended to carry out azimuthal sounding surveys at any desired
survey area in order to select the preferred direction of sounding prior
to any main resistivity survey.
Fractures were found to occur at depths ranging from 5 meters
to 50 meters depending on the sounding location. The pattern of
anisotropy associated to fractures was found to be neither circular nor
elliptical. The general trend of fractures in the area could not be
ascertained or generalized since the data coverage was limited and
more azimuthal sounding surveys are required to cover the entire
survey area. The sounding points in which fractures occur are
recommendable locations for groundwater bore holes.
Description
THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA, IN PARTIAL FULFILLMENT
OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF
MASTER OF SCIENCE, APPLIED GEOPHYSICS.
DEPARTMENT OF PHYSICS
FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY,
ZARIA-NIGERIA.
Keywords
INVESTIGATION,, GROUNDWATER,, FEDERAL POLYTECHNIC,, NASARAWA,, NIGERIA.