Geophysical and geochemical characterisation of groundwater resources in Western Zambia

Mkhuzo Chongo, Kawawa Eddy Banda, Peter Bauer-Gottwein, F. Larsen, A. V. Christiansen, I. Nyambe

    Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

    283 Downloads (Pure)


    Zambia’s rural water supply system depends on groundwater resources to a large extent. However, groundwater resources are variable in both quantity and quality across the country and a national groundwater resources assessment and mapping program is presently not in place. In the Machile area in South-Western Zambia, groundwater quality problems are particularly acute. Saline groundwater occurrence is widespread and affects rural water supply, which is mainly based on shallow groundwater abstraction using hand pumps.

    This study has mapped groundwater quality variations in the Machile area using both ground-based and airborne geophysical methods as well as extensive water quality sampling. The occurrence of saline groundwater follows a clear spatial pattern and appears to be related to the palaeo Lake Makgadikgadi, whose northernmost extension reached into the Machile area. Because the lake was a closed endorheic system over at least parts of its geologic history, evapo-concentration caused high lake water salinity and deposition of saline sediments. Those saline sediments are presently exposed at the land surface. Surface water – groundwater interaction as well as local recharge from precipitation has formed limited freshwater reservoirs in a generally saline area, which need to be sustainably managed.

    We will present initial results from the geophysical and geochemical surveys conducted over the past few years. We will interpret these findings in terms of the geologic history of Southern Africa and link them to Lake Palaeo Makgadikgadi. Finally, we will discuss implications for sustainable groundwater resources management in the area.
    Original languageEnglish
    Publication date2013
    Number of pages1
    Publication statusPublished - 2013
    Event7th Annual Meeting of the Danish Water Research and Innovation Platform - Technical University of Denmark, Kgs. Lyngby, Denmark
    Duration: 31 Jan 201331 Jan 2013
    Conference number: 7


    Conference7th Annual Meeting of the Danish Water Research and Innovation Platform
    LocationTechnical University of Denmark
    CityKgs. Lyngby


    Dive into the research topics of 'Geophysical and geochemical characterisation of groundwater resources in Western Zambia'. Together they form a unique fingerprint.

    Cite this