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Study of Boreholes├ó┬?┬? Data from the Eastern Part of Mandara Hill Area of Northeastern Nigeria | Abstract
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Abstract

Study of Boreholes├ó┬?┬? Data from the Eastern Part of Mandara Hill Area of Northeastern Nigeria

Author(s): S. C. Alkali, E. M. Gadzama and S. N. Yusuf

Static water level map of boreholes in the study area shows low, medium and deep static water level
closures from one part to another. Depth to the static water level increases away from the foot of
Mandara hill area due to deepening of the substratum. Low discharge rates from boreholes are attributed
to possible concentration of argillaceous materials, while higher discharge rates occur where the aquifer
is dominated by sandy materials. High displacement closure values in the central region are enveloped by
medium and lower ones on both sides. Lower values depict potential hydrogeological units favourable for
groundwater accumulation. Also lower dynamic water level along some communities’ boreholes may
indicate favourable water well conditions. Production capacities of the wells are higher where the wells
stabilized at short intervals of pumping. The presence of fine-grained matrix in coarse-grained fractions
conditioned the aquifer around some community boreholes to transmit insufficient amount of water into
the wells where continuous withdrawal is interrupted from time to time to enable recovery. Medium
storage coefficients values enclosed higher ones along some parts. The hydraulic conductivity values are
within those of basement aquifer. Lower hydraulic conductivity values dominated the central region. The
presence of fine-grained matrix in coarse-grained sediments conditioned the low conductivity of the
aquifer along the north – south direction. Medium hydraulic conductivity zones enveloped higher values
at the eastern and southwestern parts. Evaluations of the hydrogeological parameters of boreholes’
aquifer indicate favourable conditions that can sustain water supply needs in the area when properly
managed.