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Groundwater Vulnerability Map For South Africa

This study developed a national groundwater vulnerability map for South Africa using a modified DRASTIC approach called the DRASTIC Specific Vulnerability Index (DSVI), which incorporates an additional anthropogenic impact parameter (land use). The methodology combines multiple hydrogeological and environmental layers—depth to groundwater, recharge, aquifer media, soil media, topography (slope), vadose zone impact, hydraulic conductivity, and land use—which are rated and weighted (including use of the Analytical Hierarchy Process) and combined in a GIS environment to produce a final vulnerability surface. The resulting national vulnerability raster is reported at 150 × 150 m spatial resolution. The vulnerability classes are compared against groundwater quality indicators including borehole electrical conductivity (EC) from the National Groundwater Database and a nitrate map, showing broad similarities between higher vulnerability zones and poorer groundwater quality patterns. The published paper emphasises appropriate scale use (regional planning rather than site-specific interpretation) and recommends periodic updating and careful communication to reduce misuse.

Data and Resources

Additional Info

Field	Value
Email	vanderLaanM@arc.agric.za
Authors	Author 1 Author first name Chiedza Author surname Musekiwa Email cmusekiwa@geoscience.org.za Author organization Council for Geoscience Department Is this author a contact person for the dataset? True Author 2 Author first name Kwazikwakhe Author surname Majola Email Author organization Department of Water Affairs Department Is this author a contact person for the dataset?
Contact person	Contact 1 Contact name Chiedza Email cmusekiwa@geoscience.org.za Contact organization Council for Geoscience Department
Recommended citation	MUSEKIWA C and MAJOLA K (2013) Groundwater Vulnerability Map for South Africa. South African Journal of Geomatics 2 (2) 152-163.
Did the author / contact organization collect the data?	false
Name of organization that collected the data	Council for Geoscience and Department of Water Affairs
Dataset language	English
Publisher	South African Journal of Geomatics
Publication date	2013-04-30
Project number	Not stated
License	Open (Creative commons)
License URL	https://creativecommons.org/licenses/by-sa/4.0/
Keywords	groundwater vulnerability, DRASTIC, DSVI, aquifer vulnerability, groundwater contamination, land use, GIS, AHP, hydraulic conductivity, vadose zone, recharge, South Africa
Geographic location or bounding box coordinates
Topic category	Groundwater
Data structure category	Structured (clearly labelled and in a standardised format)
Uploader estimation of extent to which data have been processed	Refined
Is the data time series or static	Static
Data reference date	Data reference date 1 Data reference date (from) 1990-01-01 Data reference date (to) 2004-12-31
Alternate identifier
Vertical extent datum	masl
Vertical minimum-maximum extent	Vertical minimum-maximum extent 1 Minimum vertical extent 0 Maximum vertical extent 3451
I agree to the data management plan and terms and conditions of the WRO	true