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Troy Brandt, Principal Biologist
Willamette River BasinInundation Mapping
December 11, 2012Courtesy Eagle Digital Imaging, Inc.
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Acknowledgements
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• What is inundation mapping?
• Who will use the information?
• How will the information be used?
A cost-effective analysis for predicting floodplain inundation associated with a given flood event.
Fish and wildlife agencies, conservation/restoration organizations, planners, emergency responders(?).
To assess how regulated flows influence the floodplain• Ecological• Social• Economic
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Study Areas• Willamette River –
Eugene to Oregon City
• Middle Fork and Coast Fork Willamette River
• McKenzie River
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Map Development• Use available gage data• Determine 2-year
discharge and stage• Create 2-year discharge
profile and layer
• Overlay on topographic surface model
• “Bathtub” model – based on elevations, not a hydraulic model
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Method Limitations• 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
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Willamette River Profile
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Calapooia River Confluence
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Grand Island
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Harkens Lake
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Map Use• USACE revetment analysis• Floodplain habitat fish use• Conservation easement prioritization• Historical wetlands analysis• Emergency responder access
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USACE Revetment Analysis
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Progress, challenges, and the future• 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
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Data• 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 protected]