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Big Quilcene River Fish Habitat Analysis Using the Instream Flow Incremental Methodology

Publication number Date Published
OFTR 99-05March 1999
VIEW NOW Big Quilcene River Fish Habitat Analysis Using the Instream Flow Incremental Methodology (Number of pages: 54) (Publication Size: 2800KB)

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Author(s) Caldwell, B.
Description The Washington State Department of Ecology (Ecology) conducted an instream flow study in the Big Quilcene River using the Instream Flow Incremental Methodology. The study provides information about the relationship between streamflows and fish habitat which can be used in developing minimum instream flow requirements for fish in the Big Quilcene River. One site, composed of eight transects, was chosen. The site was located at approximately River Mile 1.1. Streamflow measurements and substrate information were recorded at high, medium and low flows. This information was entered into the IFG4 hydraulic model to simulate the distribution of water depths and velocities with respect to substrate and cover under a variety of flows. Using the HABTAT model, the simulated information was then used to generate an index of change in available habitat relative to changes in flow; this index is referred to as "weighted usable area" (WUA).
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Contact Water Resources Program at 360-407-6872
Keywords stream, Instream Flow Incremental methodology, Methodology, habitat, flow, model, fish, study, river, water, tribe, instream flow, fish habitat
WEB PAGE Water Resources Program
WATERSHED Water Resource Inventory Area 17 Quilcene-Snow

Chehalis River Basin, WRIAs 22 and 23, Fish Habitat Analysis Using the Instream Flow Incremental Methodology