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Functional Flows in Modified Riverscapes: Hydrographs, Habitats and Opportunities

Authors
Type
Published Article
Journal
BioScience
Publisher
Oxford University Press
Publication Date
Jul 31, 2015
Volume
65
Identifiers
DOI: 10.1093/biosci/biv102
Source
Center for Watershed Sciences John Muir Institute of the Environment
License
Unknown

Abstract

Building on previous environmental flow discussions and a growing recognition that hydrogeomorphic processes are inherent in the ecological functionality and biodiversity of riverscapes, we propose a functional-flows approach to managing heavily modified rivers. The approach focuses on retaining specific process-based components of the hydrograph, or functional flows, rather than attempting to mimic the full natural flow regime. Key functional components include wet-season initiation flows, peak magnitude flows, recession flows, dry-season low flows, and interannual variability. We illustrate the importance of each key functional flow using examples from western US rivers with seasonably predictable flow regimes. To maximize the functionality of these flows, connectivity to morphologically diverse overbank areas must be enhanced in both space and time, and consideration must be given to the sediment-transport regime. Finally, we provide guiding principles for developing functional flows or incorporating functional flows into existing environmental flow frameworks.

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