Modelling an inland Delta aquifer system to evolve pre-development management schemes: a case study in Upper Thamalakane River valley, Botswana, southern Africa |
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Authors: | M Thangarajan F Linn Vincent Uhl T B Bakaya G G Gabaake |
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Institution: | (1) National Geophysical Research Institute, Hyderabad, India, IN;(2) Eastend Investments, Pty., Ltd., Gaborone, Botswana, BW;(3) Department of Water Affairs, Govt. of Botswana, Gaborone, Botswana, BW |
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Abstract: | Groundwater modelling studies have been found to be a potential tool in planning the pre-development management of groundwater
resources in newly developing aquifer systems. One such study was attempted in Upper Thamalakane River valley, Okavango Delta,
Botswana (southern Africa). There are three major aquifers separated by two aquitards in the valley portion. The top two aquifers
are freshwater bearing zones and the bottom one is saline. The hydrological set-up of the basin is complex, as the groundwater
flow directions are opposite in the upper-unconfined and in the lower-confined aquifers. A preliminary multilayer model was
developed for this aquifer system by making use of only available data. The hydrodynamic behavior was then studied under two
prediction scenarios to evolve appropriate management decisions for locating the well field (large diameter wells) in the
upper aquifer by making use of induced river infiltration during the flood season. The aquifer response for variable river-flow
conditions was studied and the induced river infiltration was quantified.
Received: 27 August 1998 · Accepted: 8 March 1999 |
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Keywords: | Thamalakane River valley Management schemes Multilayer model and Okavango Delta |
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