It is possible to think of three different levels of sustainability for water resources: 1) the narrow viewpoint of maintaining the physical water resources, 2) the broader aim of maintaining basin ecosystems or 3) the allencompassing aim outlined by Dixon and Fallon (1989) of sustaining a balance between social and physical components, between economic returns, social equity, and ecological and hydrological needs. Emphasizing the environmental viewpoint, Jones (1999) proposed two key dicta for water management:
1 That water should be managed in such a way as to minimize the interference with nature and to maximize the benefi ts for nature. This means managing water use and manipulation in such a way as to preserve and even enhance the water needed by wildlife and the environment, and
2 That the environment should be managed in such a way as to minimize adverse impacts on and maximize benefi ts for water resources or fl ood hazard.