Transcription of Western Cape Unit - Geoscience
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Western Cape Unit - Geoscience
1 Western Cape Unit Box 572 Bellville 7535 SOUTH AFRICA c/o Oos and Reed Streets Bellville Cape Town Reception: +27 (0) 21 946 6700 Fax: +27 (0) 21 946 4190 groundwater vulnerability map for South Africa C. Musekiwa and K. Majola Council for Geoscience Report number: 2011-0063 Copyright 2011. Council for Geoscience 2 Contents 1 Introduction to groundwater vulnerability assessment ..4 2 3 Regional groundwater vulnerability assessment in South Africa ..8 Regional groundwater vulnerability using Other methods for vulnerability assessment in South Africa ..10 4 Rating of Weighting of 5 Datasets ..12 Depth to water table ..12 Net Aquifer Soil media ..15 Topography (slope)..17 Impact of the vadose zone ..18 Hydraulic Land 6 7 8 Limitations of vulnerability assessment 9 References ..26 Figures Figure 1: Depth to groundwater Figure 2: Recharge map 3 Figure 3: Aquifer media map of South Africa..15 Figure 4 : Soil texture Figure 5: Slope classes used for the study Figure 6: The different classes for the impact of the vadose zone Figure 7: Generalised land use map of South Figure 8: The resulting vulnerability map of South Africa.
4 1 Introduction to groundwater vulnerability assessment Vulnerability of groundwater is a relative, non-measurable, dimensionless property (IAH, 1994).
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