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The Development of a Flood Warning and Response System

The Development of a Flood Warning and Response System. Cameron Ackerman, P.E. Hydrologic Engineering Center, USACE. Purpose. Provide a Flood Warning and Response System to communities along river systems Maximize response time (County Emergency Management Agency and Floodplain Residents)

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The Development of a Flood Warning and Response System

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  1. The Development of aFlood Warning and Response System Cameron Ackerman, P.E. Hydrologic Engineering Center, USACE

  2. Purpose • Provide a Flood Warning and Response System to communities along river systems • Maximize response time (County Emergency Management Agency and Floodplain Residents) • Use stage/elevation-based flood inundation mapping • Damage estimates (expedite disaster assistance) • Evacuation & flood warning plan formulation tool • Educate the public on flood hazard

  3. Software Development Goals • Use existing technologies as much as possible to develop the FWRS • Develop new tools and interfaces only where necessary • Maximize the use of geospatial displays • Keep the interface simple and customizable • Easily update data

  4. Process Components • Forecast Information • National Weather Service Forecasts • River Hydraulics Model • River Analysis System (HEC-RAS), HEC-GeoRAS • Data Visualization • ArcGIS – Customized Interface, Excel • Flood Damage Computations • Structure Inventory • Flood Impact Response Tables

  5. Pennsylvania Wilkes-Barre Columbia County Luzerne County Susquehanna River Montour County Danville Bloomsburg Sunbury Northumberland County Study Area – Susquehanna River • 4 NWS Forecast Locations

  6. Study Area - San Antonio River • 3 NWS Forecast Locations

  7. HEC-RAS Model Creation and Calibration

  8. Inundation Mapping using HEC-GeoRAS • Atlas of water surface profiles/inundation maps run to cover the range of expected events

  9. Flood Warning and Response System • Customized interface to ArcGIS • Entry of forecast information • Query of inundation depths • Access impact response tables • Calculate structure damages Zoom Locations Response Tables

  10. Wilkes-Barre Bloomsburg Danville Sunbury Forecast Entry – Susquehanna River • Predefined Locations for entry of Elevation or Stage

  11. Flexible “selection” of input locations FWRS input form is built based on Excel sheet 117.7 < Elev. < 147.5 Forecast Entry – San Antonio River

  12. Tiled Mapping • 20 Tiles San Antonio River, 16 Tiles Cibolo Creek

  13. Interpolation by profile number Backwater by water surface elevation at confluences to handle tributaries Data stored by profile Tiled Mapping

  14. Mapping Layers

  15. Flood Impact Response Tables • Given a forecasted elevation: • What is the expected impact? • What response action should be taken? • Developed by individual local Emergency Management Agencies • Excel spreadsheet • May be formatted (font, color, size)

  16. Flood Impact Response Tables

  17. Flood Damage Analysis • Structure inventory • Depth-%Damage curves • Damage Category (Susquehanna River) • Residential, commercial, ... • Occupancy type (San Antonio River) • Single Story Residential, 2 Story Residential, Mobile Home, Single Story Apartment, …

  18. Structure Damage • Query inundation depth • Compute individual structure damage

  19. System-wide Damage • Working estimate for FEMA disaster relief

  20. Contact Information • Cameron Ackerman, P.E.Hydrologic Engineering Center, USACEcameron.t.ackerman@usace.army.mil

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