Introduction
sediment transport and inputs was conducted using a combination of field data collection, aerial photo interpretation, and outputs from the hydrologic model. The sediment analysis informed an understanding of potential future conditions if a dam is constructed. A fish habitat characterization was conducted using the Physical Habitat Simulation (PHABSIM) modeling component of the Instream Flow Incremental Methodology (IFIM). The fish habitat analysis included field data collection and model analysis. Current and future fish habitat estimates were informed by the sediment transport analysis and the hydrology analysis. All of these analysis components were applied in the SHIRAZ model as inputs to characterize habitat capacity or productivity parameters that influence salmonid production in the mainstem Chehalis River.
Figure 1-2 Conceptual Flow Chart of the Data Collection and Modeling Analysis Conducted in the Study and Contributing to the SHIRAZ Fish Population Modeling Analysis Chehalis River Flood Storage Dam Fish Population Impact Study
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April 2012 100705-01.01