EVALUATION OF GROUNDWATER LEVEL TIME-DEPENDENT VARIATION AND AQUIFER CHARACTERISTICS WITHIN SHEET 223, ILORIN NORTH WEST, SOUT
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Date
2022
Authors
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Journal ISSN
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Publisher
COOU Journal of Physical Sciences
Abstract
The assessment of groundwater level time-dependent variation and aquifer characteristics has
been carried out, aimed at knowing the variation in groundwater elevation at the end of the
rainy season and at the peak of the dry season. The time-dependent variation was done by
direct in situ groundwater level measurement from eighty existing wells. Aquifer
characteristics were determined by using pumping test data of the available boreholes in the
area, using modified Jacob’s method. Configuration of groundwater level contours shows that
the highest groundwater elevation in the area is 445 m and the lowest is 295 m above sea level.
Also, areas with water levels ranging between 1 and 2 m are areas of low water level while
areas with water levels ranging between 9.5 m and 11 m are areas of high water level.
Transmissivity is estimated to range between 3.49 and 8.50 m
2
/day with an average value of
5.61 m2
/day, Hydraulic conductivity range between 2.18 × 10-1 and 7.64× 10-2 m /day with an
average value of 1.65 × 10-1 m /day and Storativity range from 3.45 to 9.15 with an average
value of 5.04. Areas with the shallow water level, depicting high potential, are in the southern
part while the northern part is an area of low groundwater potential. The average value for
Storativity is higher than the assigned limit (0.005-0.00005) for most confined aquifers,
indicating that the storage potential of the boreholes is high; hence their recharge potential is
high
Description
The article evaluated groundwater level variations at the end of raining season and at the peak of dry season with emphasis on aquifer characteristics of the area.