oa Botswana Notes & Records - Groundwater pollution vulnerability map of Botswana 1:1,000,000

Volume 27, Issue 1
  • ISSN : 0525-5090



The map is an interpretation of the Groundwater Resources Map of Botswana (v Hoyer & Struckmeier, 1987) in terms of groundwater sensitivity towards pollution. Infiltrating rainwater is regarded as the sole means of transport of pollutants into the groundwater system. Migration time, decay and adsorbtion of these contaminants are determined by the amount of groundwater recharge, thickness, and properties of soils, sediments, and rocks in the unsaturated zone. The paper descriptionbes the pollution vulnerability of aquifer systems in Botswana based on five classes, (extreme, high, moderate, low, and negligible vulnerability) and three subclasses. The sub-classes are also related to groundwater quality and potential. Furthermore, the need for more legal groundwater protection is addressed. The conception of the vulnerability map is, to assist both laymen and professionals in hydrogeology. The map should serve as a general guideline for planners and decision makers with land-use development issues. Furthermore, it is designed to make the general public aware of the pollution risk of water resources and to direct their attention towards a rational use and conservation of groundwater resources. In this respect the map should also be used in the nation's secondary schools, polytechnic, and university.

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