Impacts of hydropower induced extreme flows: estimation and mitigation of human and environmental risks

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The need for improved methods for understanding and mitigating the risks imposed on communities and the environment due to dam releases, including high flows related to controlled spilling under normal operations, controlled low flows and catastrophic flows under breach events, is widely recognized. This work advances the identification and estimation of such risks and develops methods for assessing alternative structural and non-structural mitigation approaches for reducing them. Community flood loss estimation and the identification of tools that aid in planning for mitigation, warning, and evacuation of communities requires analysis of the risk management concerns faced by stakeholders at a number of planning levels, but in general reduce to questions of whether to inform individuals to escape or to shelter in place. The risk of adverse environmental conditions due to extreme high or low flows, and the mitigation of these impacts, requires the development of environmental response models that are designed to capture extreme events exhibiting intensive rapidly changing behavior. The selection, and development of appropriate modeling tools, investigation of mitigation alternatives, and development of mitigation alternatives, and development of performance indicators for evaluating the effectiveness of the mitigation practices for reducing human and environmental risks, will be undertaken. In evaluating and mitigating community impacts, efforts will be made to address the concerns faced by the asset owner and the community at risk. Additionally, tools for assisting stakeholders in evaluating trade-offs between the community and environmental risks and between alternative mitigation strategies will be developed.