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a particular site, then a station number must be allocated to that site. Most groundwater
sites however are infrequently sampled, while some sites are sampled only once.
Groundwater data can be obtained from the Directorate of Geohydrology in Pretoria. The
National Groundwater Database can be accessed via the Computing Centre for Water
Research, University of Natal, Private Bag X01, Scottsville, 3209, and the Institute for
Groundwater Studies.
It should be noted that a requirement laid down by the Borehole Water Association of
Southern Africa, PO Box 2178, Southdale, 2135, is that all drilling contractors lwho are
members of the Association), must record borehole/well data on standard forms provided
by the Association. The information should then be submitted to the Directorate of
Geohydrology for possible inclusion in the National Groundwater Database. Unfortunately,
drillers who are not members of the Association seldom bother to send the relevant data
to the Directorate. Borehole logs lof varying degrees of accuracy), are rarely kept for long
periods by these drillers.
11.5 Groundwater models
Groundwater models are not discussed in this publication (as stated in Chapter 1). Nearly
all such modelling has been undertaken in the drier areas of South Africa·. The chapter
on solid waste management contains a brief description of some computer techniques
applicable to landfill sites in South Africa, with reference to groundwater contamination.
• See for example, Van Tonder, G.J. and Cogho, V.E., 1987. AQUAMOD: 'n twee-dimensionele
Galerlc.in eindige element simulasieprogram vir mikrarekenaars vir die vaorspeUing van versadigde
grondwatervloei en besoedeling, Water SA. VOl 13{31, p. 175 - 180., as well as Verwey, J.P. and
Botha, J.F., 1992. A comparative study of two - and three - dimensional groundwater models,
VOl 1, WRC Report No. 271/1/92, Water Research Commission, Pretoria, 97 p. Some groundwater
models used in South Africa, as well as other groundwater models, are briefly described in the
following: CSIR Environmental Services, 1995. Procedures to assess effluent discharge impacts,
WRC Report No. TT 64/94, Water Research Commission and the Department of Water Affairs and
Forestry, Pretoria, 352 p. See in addition: Bredenkamp, D.B.. Botha, LJ., Van Tonder, G.J. and
Janse van Rensburg, H., 1995. Manual on quantitative estimation of groundwater recharge and
aquifer storativity: based on practical hydrcHogical methods, WRC Report No. TT 73/95, Water
Research Commission, Pretoria, 363 p. + app.