Vertical electrical sounding as an exploration technique to improve on the certainty of groundwater yield in the fractured crystalline basement aquifers of eastern Uganda. & A. & P.W. & M.
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Date
2008
Authors
Journal Title
Journal ISSN
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Publisher
Hydrogeology journal
Abstract
Groundwater in eastern Uganda mostly occurs in
fractures in the crystalline basement rocks and at the
interface between the overburden and bedrock. The study
was aimed at improving the success rate of boreholes
through the use of complimentary geophysical siting
procedures in 16 locations in Kamuli District, eastern
Uganda. Boreholes that were sited after applying appropriate
geophysical techniques yielded adequate quantities of water,
whereas those sited where such procedures were not applied
were out of service sooner than expected. Techniques to
determine the precise location of resistivity anomaly and
vertical electrical sounding (VES) models were used to
locate water-bearing zones. VESs were undertaken to
provide an overview of the geology. The apparent resistivities of the water-bearing zones both from VES and
resistivity profiling data, had a relationship with the success
rates of the boreholes. Electrical resistivities were correlated
with hydrogeological parameters. The majority of successful
boreholes had, within water-bearing zones, minimum
apparent resistivity values less than 200 and 100 Ohmm,
from the resistivity profiling anomalies and VES, respectively. The depth to bedrock was generally greater than 20m
below ground level, which indicates potential for medium
yielding boreholes.
Description
Keywords
Vertical electrical sounding . Geophysical methods . Groundwater exploration . Hydraulic properties . Uganda
Citation
Batte, A. G., Muwanga, A., Sigrist, P. W., & Owor, M. (2008). Vertical electrical sounding as an exploration technique to improve on the certainty of groundwater yield in the fractured crystalline basement aquifers of eastern Uganda. Hydrogeology journal, 16(8), 1683-1693. DOI 10.1007/s10040-008-0348-4