Willamette River Basin Inundation Mapping - Brandt

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Presented by Troy Brandt of River Design Group.

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  • 160 river miles mapped.
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  • Outline for the presentation
  • Willamette River Basin Inundation Mapping - Brandt

    1. 1. Willamette River BasinInundation Mapping Troy Brandt, Principal Biologist December 11, 2012 Courtesy Eagle Digital Imaging, Inc.
    2. 2. • What is inundation mapping? A cost-effective analysis for predicting floodplain inundation associated with a given flood event.• Who will use the information? Fish and wildlife agencies, conservation/restoration organizations, planners, emergency responders(?).• How will the information be used? To assess how regulated flows influence the floodplain • Ecological • Social • Economic
    3. 3. • Willamette River – Eugene to Oregon City• Middle Fork and Coast Fork Willamette River• McKenzie River
    4. 4. • Use available gage data • Overlay on topographic• Determine 2-year surface model discharge and stage • “Bathtub” model –• Create 2-year discharge based on elevations, not profile and layer a hydraulic model
    5. 5. • Based on elevation differences• Does not account for obstructions (e.g. roads)• Mainstem depth relates to elevation above water surface at time of LiDAR acquisition• Not for regulatory use
    6. 6. • USACE revetment analysis• Floodplain habitat fish use• Conservation easement prioritization• Historical wetlands analysis• Emergency responder access
    7. 7. • Maps and GIS data offer a tool for restoration planning and other efforts• Products are useful for assessing historical conditions and predicting possible ecological outcomes associated with river management• Help direct restoration prioritization and spending
    8. 8. • Currently available - Mainstem Willamette River  Regulated 2-year water surface GIS layer  Regulated 2-year inundation maps in pdf format  2012 Flood air photos  2012 Flood air photo maps in pdf format• To come - MF-CF Willamette River GIS, maps and documentation - McKenzie River maps GIS, maps and documentation www.riverdesigngroup.com info@riverdesigngroup.com

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