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Abstract
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Article Information:
Groundwater Resources Potential in the Coastal Plain Sands Aquifers, Lagos, Nigeria
E.O. Longe
Corresponding Author: Ezechiel Longe
Submitted: 2010 September, 03
Accepted: 2010 October, 14
Published: 2011 January, 05 |
Abstract:
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The hydraulic properties of the aquifers located in the coastal plain sands, Lagos, Nigeria had been
investigated. A review of both the theoretical and practical applications of pumping tests in groundwater
resource evaluation for coastal plain sands aquifer was carried out. The main activities involved collation of
information related to well logs, step-drawdown and constant rate pumping tests from existing database on
borehole drilling in seven wells to an average depth of 100 m. Graphical methods based on Rorabaugh’s
Hantush-Bierschenk’s analyses were used to determine the components of drawdown due to well and aquifer
losses from the step-drawdown pumping tests. Conventional analytical methods based on non-equilibrium
equation were used to assess the local hydraulic regime of the groundwater system using constant rate pumping
tests data. Data from 11 controlled pumping tests in Shomolu area of Lagos metropolis were analyzed. The
transmissivity values of the multi-layered aquifer system range between 345.6 and 2,332 m2/day while the
storage coefficient values range between 2.8x10-4 and 4.5x10-4. Both results indicate confined aquifers of
artesian conditions. The step-drawdown pumping tests results indicate that well losses constituted a significant
component of drawdown in the pumped wells, a phenomenon due to poor well design, well development; and
non-Darcian flow in the multi-layered aquifer. The pumping test results allowed for theoretical and practical
prediction of aquifer and well yields in the study area.
Key words: Aquifer loss, coastal plain sands, drawdown, groundwater potential, well loss, well yield,
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Cite this Reference:
E.O. Longe, . Groundwater Resources Potential in the Coastal Plain Sands Aquifers, Lagos, Nigeria. Research Journal of Environmental and Earth Sciences, (1): 1-7.
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ISSN (Online): 2041-0492
ISSN (Print): 2041-0484 |
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