In the Moshupa Wellfield area of Botswana, fractured and weathered parts of the basement granitic rocks constitute the dominant local aquifers. Investigation of these aquifers was achieved using 2-D electrical resistivity imaging. The 2-D continuous vertical electrical sounding (CVES) techniques proved a significant advantage over the conventional vertical electrical sounding (VES) technique in that mapping of the subsurface was continuous along a profile. Three 2-D CVES profiles were undertaken in the area of study and the interpretations were used to identify areas with good prospects of finding groundwater in sufficient quantities for small-scale water supply development. Boreholes drilled in the area yielded groundwater in sufficient quantities (∼8 m3/h) to support small-scale domestic water supply and/or livestock and vegetable farming in the area. The results of this study indicate that the 2-D CVES is very useful in selecting borehole sites and if properly employed could greatly assist in choosing productive borehole locations, thus reducing financial losses associated with a poorer choice of boreholes location outside fractured regions.
|Number of pages||8|
|Journal||Journal of Environmental and Engineering Geophysics|
|Publication status||Published - Jan 1 2003|
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Geotechnical Engineering and Engineering Geology