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Environmental FlowsSaving Rivers in the Third Millennium$
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Angela H. Arthington

Print publication date: 2012

Print ISBN-13: 9780520273696

Published to California Scholarship Online: May 2013

DOI: 10.1525/california/9780520273696.001.0001

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Hydraulic Rating and Habitat Simulation Methods

Hydraulic Rating and Habitat Simulation Methods

(p.139) 10 Hydraulic Rating and Habitat Simulation Methods
Environmental Flows

Angela H. Arthington

University of California Press

Hydraulic rating methods define the relationship between flow volume (discharge) and the amount and type of habitat provided during the passage of flow along a stream channel. Methods include wetted perimeter or area analysis, flow events method, and various habitat simulation techniques and frameworks. The Instream Flow Incremental Methodology (IFIM) and its core component, the physical habitat modeling platform PHABSIM, are widely used. The main prediction phase of IFIM combines information derived from hydraulic simulation with data on habitat preferences of target species (usually fish), and prediction of habitat availability (expressed as weighted usable area, WUA) at different discharges. A WUA time series plot can be developed to depict changes in habitat over time as a consequence of flow alterations.

Keywords:   hydraulic methods, wetted perimeter, habitat simulation, target species, Instream Incremental Flow Methodology (IFIM), weighted usable area, time series plot

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