Reservoir management to balance ecosystem and human needs: incorporating the paradigm of the ecological flow regime

• Published in: Water resources research 2006-03, Vol.42 (3), p.n/a
• Main Authors: Suen, J.P, Eheart, J.W
• Format: Article
• Language: English
• Subjects: algorithms; aquatic zones; best management practices; community ecology; decision support systems; ecological balance; ecological flow regime; ecosystem management; ecosystems; intermediate disturbance hypothesis; multiobjective optimization; reservoir operation; reservoirs; system operation and management; water flow; water management; water resources; water supply; watershed hydrology; watershed management
• ISSN: 0043-1397; 1944-7973
• DOI: 10.1029/2005WR004314

The history of environmental flow analysis shows a shift from an emphasis on a flat line minimum flow requirement to the development of a holistic, regime-based, approach to flow management. The ecological flow regime determines environmental flow by embracing the multitude of species within an ecosystem rather than emphasizing a single species. Moreover, this paradigm recognizes that flow magnitude, duration, frequency, timing, and predictability must be incorporated into any flow management strategy. In this study, the ecological flow regime paradigm is used to establish such comprehensive and complex management targets for operating a reservoir to satisfy a downstream aquatic ecosystem. The new paradigm incorporates the intermediate disturbance hypothesis, which holds that ecosystems are healthier under disturbances that are neither too small nor too large. The nondominated sorting genetic algorithm is used to find the Pareto set of operating rules that provides decision makers with the optimal trade-off between human needs and ecological flow regime maintenance.