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A decision framework for managing the Spirit Lake and Toutle River System at Mount St. Helens /Committee on Long-Term Management of the Spirit Lake/Toutle River System in Southwest Washington ; Committee on Geological and Geotechnical Engineering, Board on Earth Sciences and Resources, Water Science and Technology Board, Division on Earth and Life Studies ; Board on Environmental Change and Society, Division of Behavioral and Social Sciences and Education

National Academies of Sciences, Engineering, and Medicine (U.S.).Committee on Long-term Management of the Spirit Lake/Toutle River System in Southwest Washingto

Washington, DC : the National Academies Press [2018].

1 online resource (xii, 320 pages) : color illustrations

Includes bibliographical references (pages 285-295). / "The 1980 eruption of Mount St. Helens in southwest Washington State radically changed the physical and socio-economic landscapes of the region. The eruption destroyed the summit of the volcano, sending large amounts of debris into the North Fork Toutle River, and blocking the sole means of drainage from Spirit Lake 4 miles north of Mount St. Helens. As a result of the blockage, rising lake levels could cause failure of the debris blockage, putting the downstream population of approximately 50,000 at risk of catastrophic flooding and mud flows. Further, continued transport of sediment to the river from volcanic debris deposits surrounding the mountain reduces the flood carrying capacity of downstream river channels and leaves the population vulnerable to chronic flooding. he legacy of the 1980 eruption and the prospect of future volcanic, seismic, and flood events mean that risk management in the Spirit Lake Toutle River system will be challenging for decades to come. This report offers a decision framework to support the long-term management of risks related to the Spirit Lake and Toutle River system in light of the different regional economic, cultural, and social priorities, and the respective roles of federal, tribal, state, and local authorities, as well as other entities and groups in the region. It also considers the history and adequacy of characterization, monitoring, and management associated with the Spirit Lake debris blockage and outflow tunnel, other efforts to control transport of water and sediment from the 1980 and later eruptions, and suggests additional information needed to support implementation of the recommended decision framework"Publisher's description

Introduction / Regional setting / Institutional setting: developing a common understanding / Natural hazards / The engineered landscape / Choosing a decision framework and identifying the decision problem / Identifying decision objectives and alternatives / Decision consequences and trade-offs / Applying the decision framework / References / Appendixes

9780309464451 0309464455

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