Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 1690
Title: Large-scale flow experiments for managing river systems
Author: C. P. Konrad, Julian D. Olden, David A. Lytle, Ted Melis, John C. Schmidt, Erin Bray, Mary Freeman, Keith Gido, Nina Hemphill, Mark J. Kennard, Laura McMullen, Meryl C. Mims, Mark Pyron, Christopher Robinson, John G. Williams
Publication Year: 2011
Journal: Bioscience
Volume: 61
Issue: 12
Pages: 948-959

Experimental manipulations of streamflow have been used globally in recent decades to mitigate the impacts of dam operations on river systems.  Rivers are challenging subjects for experimentation, because they are open systems that cannot be isolated from their social context.  We identify principles to address the challenges of conducting effective large–scale flow experiments.  Flow experiments have both scientific and social value when they help to resolve specific questions about the ecological action of flow with a clear nexus to water policies and decisions.  Water managers must integrate new information into operating policies for large–scale experiments to be effective.  Modeling and monitoring can be integrated with experiments to analyze long–term ecological responses.  Experimental design should include spatially extensive observations and well–defined, repeated treatments.  Large–scale flow manipulations are only a part of dam operations that affect river systems.  Scientists can ensure that experimental manipulations continue to be a valuable approach for the scientifically based management of river systems.

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