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these de nitions is that enshrined in the South African Water Act of 1998. Futhermore, unlike some of the others, the South African de nition is not simply rhetoric, but public policy. In the explanatory memorandum of the Water Act 1998, the following statement is made: Sustainability is not an end in itself, but a critical approach to ensure the renewable supply of water for present and future generations. Key to this is the reserve the water needed to supply human needs and protect ecosystems. In accordance with this principle, in implementing their Water Act the government of South Africa abolished all pre-existing water rights in the country, and established the reserve as the only water right. De nition of the reserve is a multifaceted task, which is being addressed on a catchment-by-catchment basis, by a process which interweaves hydrological analysis, ecological investigations, and social considerations. The latter are evaluated not only by dispassionate observers, but also through community participation. The South African Water Act 1998 is arguably the most progressive water management legislation currently being enforced anywhere in the world. The principles which it embodies are in harmony with subsequently published global guidelines on the application of the principles of sustainable development to the water sector, developed by the World Humanity Action Trust (WHAT 2000). Table 11.2 summarizes some of the Trust s key recommendations and comments on their particular applicability to groundwater systems. Implementation of the kinds of practical measures listed in Table 11.2 pre-supposes that the system of governance in a given country (or group of neighboring countries) is capable of enforcement. This in turn requires that those managing water catchments have the accountability, professional competence and legal authority to carry out their duties, and [that legislation exists which] should make possible the meaningful participation of all interested parties (WHAT 2000). The key goal is to ensure that public values are pre-eminent, irrespective of the absolute ownership of wells, pumps, and other infrastructure.

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