Re-operation of major reservoirs for flood and environmental management

摘要

This paper summarizes the results of two similar studies of reservoir flood operations. The first study is a re-operation of Folsom Dam, California with outlet structure improvements and the potential of flood rules that are fixed or based on a combination of precipitation, snowpack, and ENSO conditions. Trade-offs between flood probabilities and water supply spill are estimated and analyzed using expected ranges of costs of levee failures downstream and the value of spilled water for water supply. The second study is a re-operation of Camanche Reservoir in central California to reallocate some flood storage for use in managing downstream environmental flows as well as urban water supply and hydropower purposes. Trade-offs between economic and environmental performance are estimated and discussed.