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The principle of ecosystem protection in the South African Water Act requires that water resource management tools for a multip le stressor environment be tailored to the characteristics of the aquatic ecosystem. The requirements of the Act, the characteris tics of aquatic ecosystems as well as co-occurrence of diverse stressors are considered. Although single substance criteria have a u seful role, they are not sufficient for resource management within the context of the ecological reserve. It is proposed that an effe ctlikelihood approach has the potential to address the variability and uncertainty in management of a surface water body subject to multiple stressors. An in-stream receiving water risk objective approach might be considered.

Rationale for an ecological risk approach for South African water resource management