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註釋The 1996 South African Water Quality Guidelines comprise one of the most widely-used tools in water quality management. However, they are now viewed as significantly out of date. A Phase 1 Department of Water Affairs and Forestry (now Department of Water and Sanitation) project was completed by a panel of experts in 2008 . They performed a needs assessment, developed a general philosophy and described the general specifications of a decision support system (DSS) for revised water quality guidelines for South Africa. The general aim of this project was to develop a software-based decision support system (DSS) able to provide both generic and site-specific risk-based irrigation water quality guidelines for South Africa. The DSS assesses fitness for use and establishes water quality requirements for the effect irrigation water constituents have on soil quality, crop yield and quality, as well as irrigation equipment.