Conjunctive use of geophysical techniques in optimizing the groundwater potential in the Kunyere and Gomoti areas of the Okavango Delta, Botswana

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The lower parts of the Okavango Delta, Botswana comprised of multi layered unconsolidated fresh water aquifer systems developed in the Kalahari Sands and a lower bedrock aquifer within the Karoo Sandstones. The Kalahari aquifers consist of fine to medium sands intervened at various levels by numerous semi-confining units of clays, sandy silts and sandy clays. The lower bedrock aquifer is saline. An investigation of these different aquifer systems was carried using airborne, surface and borehole geophysics in order to quantify the groundwater potentials of the areas. The airborne surveys consisted of magnetic and Electromagnetic surveys, the ground geophysical surveys consisted mainly of Transient Electromagnetic (TEM) and the borehole surveys consisted of gamma and resistivity logging. A comprehensive analysis of the geophysical surveys results along with borehole drilling and logging results assisted in defining the lateral and depth extent of the freshwater aquifers and also guided the successful location, drilling and testing of production boreholes in the study areas. Borehole yields range from as low as 9m 3/hr to as high as 120 m 3/hr in the Kunyere areas whilst in the Gomoti areas yields range from 50 m 3/hr to as high as 110 m 3/hr.

Original languageEnglish
Title of host publication19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints
Pages871-885
Number of pages15
Volume1
Publication statusPublished - 2006
Event19th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, SAGEEP 2006 - Seattle, WA, United States
Duration: Apr 2 2006Apr 6 2006

Other

Other19th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, SAGEEP 2006
CountryUnited States
CitySeattle, WA
Period4/2/064/6/06

Fingerprint

Botswana
aquifers
ground water
Aquifers
Groundwater
boreholes
Boreholes
aquifer
groundwater
borehole
Well logging
sandy clay
geophysical survey
bedrock
drilling
sands
clays
Drilling
Clay
Sand

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Environmental Engineering

Cite this

Shemang, E. M., Molwalefhe, L. N., & Ntsatsi, J. (2006). Conjunctive use of geophysical techniques in optimizing the groundwater potential in the Kunyere and Gomoti areas of the Okavango Delta, Botswana. In 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints (Vol. 1, pp. 871-885)
Shemang, Elisha M. ; Molwalefhe, Loago N. ; Ntsatsi, Joel. / Conjunctive use of geophysical techniques in optimizing the groundwater potential in the Kunyere and Gomoti areas of the Okavango Delta, Botswana. 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints. Vol. 1 2006. pp. 871-885
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abstract = "The lower parts of the Okavango Delta, Botswana comprised of multi layered unconsolidated fresh water aquifer systems developed in the Kalahari Sands and a lower bedrock aquifer within the Karoo Sandstones. The Kalahari aquifers consist of fine to medium sands intervened at various levels by numerous semi-confining units of clays, sandy silts and sandy clays. The lower bedrock aquifer is saline. An investigation of these different aquifer systems was carried using airborne, surface and borehole geophysics in order to quantify the groundwater potentials of the areas. The airborne surveys consisted of magnetic and Electromagnetic surveys, the ground geophysical surveys consisted mainly of Transient Electromagnetic (TEM) and the borehole surveys consisted of gamma and resistivity logging. A comprehensive analysis of the geophysical surveys results along with borehole drilling and logging results assisted in defining the lateral and depth extent of the freshwater aquifers and also guided the successful location, drilling and testing of production boreholes in the study areas. Borehole yields range from as low as 9m 3/hr to as high as 120 m 3/hr in the Kunyere areas whilst in the Gomoti areas yields range from 50 m 3/hr to as high as 110 m 3/hr.",
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Shemang, EM, Molwalefhe, LN & Ntsatsi, J 2006, Conjunctive use of geophysical techniques in optimizing the groundwater potential in the Kunyere and Gomoti areas of the Okavango Delta, Botswana. in 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints. vol. 1, pp. 871-885, 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, SAGEEP 2006, Seattle, WA, United States, 4/2/06.

Conjunctive use of geophysical techniques in optimizing the groundwater potential in the Kunyere and Gomoti areas of the Okavango Delta, Botswana. / Shemang, Elisha M.; Molwalefhe, Loago N.; Ntsatsi, Joel.

19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints. Vol. 1 2006. p. 871-885.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Shemang EM, Molwalefhe LN, Ntsatsi J. Conjunctive use of geophysical techniques in optimizing the groundwater potential in the Kunyere and Gomoti areas of the Okavango Delta, Botswana. In 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints. Vol. 1. 2006. p. 871-885