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Impacts of Flooding in the Johnson Creek W atershed

Impacts of Flooding in the Johnson Creek W atershed. Laura Read December 4, 2008. Study Region. Project Questions and Goals. Demographic description of Johnson Creek’s residents and land value Land use and changes How flooding may play a role in shaping the land usage in Johnson Creek.

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Impacts of Flooding in the Johnson Creek W atershed

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  1. Impacts of Flooding in the Johnson Creek Watershed Laura Read December 4, 2008

  2. Study Region

  3. Project Questions and Goals • Demographic description of Johnson Creek’s residents and land value • Land use and changes • How flooding may play a role in shaping the land usage in Johnson Creek

  4. Multnomah County, Johnson Creek Watershed • 170,000 residents on 52 mi2 of land • WPA’s renovations altered stream without improving flood conditions • Urbanization increased flood prone area

  5. Johnson Creek Watershed

  6. Flood Facts • Portland awarded $2.5 million from FEMA’s Pre-Disaster Mitigation Grant Program • East Lents: Flooded 39 times in the past 60 years Floodplain Floodway

  7. Taxlots and Identification • A visual property information database • Collaboration between City Bureaus

  8. Taxlot Attributes Zoomed In Sample Attribute Table

  9. Property Values

  10. Census Analysis Census data for each tract

  11. Land Cover in 1992, Multnomah Co.

  12. Land Cover in 2001, Multnomah Co.

  13. Finishing Touches • Created maps of demographic distributions: population, average house value, age, poverty, unemployment • Analyzed Land Cover and Usage for percentages • Still need to compare Multnomah Co. data to Johnson Creek

  14. Data Sources • City of Portland: taxlots, streets, streams • U.S. Census Bureau TigerLine and PUMA files • USGS Seamless for 1 arc second DEM and Land Cover Data (NLCD) • Google Earth

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