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Minnesota Silver Jackets Pilot Project

Flood Inundation Map and Warning System for Downtown St. Paul National Flood Risk Management and Silver Jackets Workshop August 23 , 2012 Jennifer Nelson , Minnesota Department of Public Safety, Homeland Security and Emergency Management, State Hazard Mitigation Officer

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Minnesota Silver Jackets Pilot Project

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  1. Flood Inundation Map and Warning System for Downtown St. Paul National Flood Risk Management and Silver Jackets Workshop August 23, 2012 Jennifer Nelson, Minnesota Department of Public Safety, Homeland Security and Emergency Management, State Hazard Mitigation Officer Terry Zien, PE, CFM, USACE – St Paul Minnesota Silver Jackets Pilot Project

  2. Flood Inundation Map and Warning Systemfor Downtown St. Paul - Study Limits Downtown Upper Landing & Harriet Island Airport

  3. Flood Inundation Map and Warning Systemfor Downtown St. PaulObjectives • Leverage existing resources • USACE HEC-RAS unsteady model for the Mississippi • Existing USGS gage location and long period of record • NWS forecast point • City of St. Paul survey data • FEMA HAZUS Database • Studies by others

  4. 1965 2001 1952

  5. Flood Inundation Map and Warning Systemfor Downtown St. Paul - Study Features

  6. Objectives - Continued • Create a flood inundation map • Define flood risk • Scenario-based • Enhanced NWS forecast capabilities • Inform public policy decisions (land use, zoning, permitting) • Develop/improve flood warning systems

  7. Upper Landing & Harriet Island

  8. Objectives - Continued • Produce public education materials • Potential to work with the Science Museum of Minnesota • Video display kiosk • Inform public on natural and beneficial uses of the flood plain • Guide mitigation efforts

  9. Harriet Island

  10. Downtown St Paul

  11. 1952 Flood

  12. Objectives - Continued • Reduce future risk to life and property! • Improve urban planning • Update existing FEMA NFIP data & documents for the study area • Promote wise use of the flood plain • Reduce future expenditures on response and recovery

  13. Downtown St. Paul Looking UpstreamMississippi River, Left Bank

  14. Downtown St. Paul Looking DownstreamMississippi River, Left Bank

  15. St Paul Airport Area

  16. St Paul Airport (circa 1943)

  17. St. Paul, MN Airport Temporary floodwalls are put up in area that is now flood fringe.

  18. Objectives - Continued • Potential to Increase CRS Credit: • FEMA will investigate the possibility to provide CRS credit to those communities who obtain inundation mapping studies as a tool for flood risk mitigation. • St. Paul could consider becoming a CRS community

  19. Status Update • Milestones Accomplished • SOW in progress with SJ team, IWR team • Developed a project time line • Identified current HEC-RAS model to be used as a basis for water surface profiles, modeling nearly complete • Investigating meaningful scenarios for HEC-RAS model • Gathering additional data needed for model, risk identification, and map production • Challenges / Limiting Factors / Gaps • Sharing of digital source data/products across different agencies • HAZUS data base may not be the best to define detailed risk information/consequences at this level of investigation • Newer, better LIDAR data delayed progress of project

  20. Questions?

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