Willamette River Basin Inundation Mapping - Brandt
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
• 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 email@example.com