Willamette River Basin Inundation Mapping - Brandt
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Willamette River Basin Inundation Mapping - Brandt

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Presented by Troy Brandt of River Design Group.

Presented by Troy Brandt of River Design Group.

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  • 160 river miles mapped.
  • Outline for the presentation
  • Outline for the presentation

Willamette River Basin Inundation Mapping - Brandt Willamette River Basin Inundation Mapping - Brandt Presentation Transcript

  • Willamette River BasinInundation Mapping Troy Brandt, Principal Biologist December 11, 2012 Courtesy Eagle Digital Imaging, Inc.
  • • 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
  • • Willamette River – Eugene to Oregon City• Middle Fork and Coast Fork Willamette River• McKenzie River
  • • 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
  • • 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
  • • USACE revetment analysis• Floodplain habitat fish use• Conservation easement prioritization• Historical wetlands analysis• Emergency responder access
  • • 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
  • • 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