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Tennessee DFIRM Product Overview: Enhancing Flood Mapping and Risk Management

This presentation by Dennis Pedersen provides an overview of the Tennessee DFIRM (Digital Flood Insurance Rate Map) product, its components, and the Tennessee Base Mapping Program. It explores key elements such as flood hazard areas, base flood elevation lines, hydrographic features, and the importance of high-accuracy topography data. The DFIRM acts as an official basis for implementing NFIP regulations, facilitating better flood risk management and informed decision-making for local officials, builders, and insurance agents. Discover the benefits and innovations that modernize flood data accessibility in Tennessee.

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Tennessee DFIRM Product Overview: Enhancing Flood Mapping and Risk Management

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  1. Flood Map Modernization and the Tennessee Base Mapping Program Dennis Pedersen, Director F&A, OIR – GIS Services

  2. Presentation Overview • What is the DFIRM Product? • Components of DFIRM Product • Tennessee Base Map Source Data • Tennessee Base Map Topography Source Data • GIS Data Sources • Benefits of DFIRM Product • Demonstration

  3. What is the DFIRM Product? • Official basis for implementing the regulations and requirements of the National Flood Insurance Program (NFIP) • A digital database that encompasses several features or layers of spatial information • DFIRM database includes: • Flood hazards areas • 1% annual chance flood (100-year flood), known as the base flood • Areas of 0.2% annual chance flood

  4. What is the DFIRM Product? (cont.) • Base (1% annual chance) Flood Elevation (BFE) lines with mapped cross section lines • Structures (dams, bridges, culverts, levees etc.) • Hydrographic features (streams, lakes, shorelines) • Transportation features with labels • Political areas (corporate and county boundaries, National Parks, forests, and military lands)

  5. What is the DFIRM Product? (cont.) • Permanent benchmarks with National Geodetic Survey (NGS) Permanent Identifier • FIRM panel areas with effective date, size, scale, and corner coordinates • USGS 7.5-minute quadrangle areas • Required to meet FEMA standards and specifications • Subject to community review and approval

  6. Base Topography Flood Data + + = DFIRM Components of DFIRM

  7. Base Mapping Program • Vision Statement: Create a statewide GIS base map through partnership development that can be used in support of a wide range of local, state, and federal programs

  8. Tennessee Base Map Source Data • Parcels and related features • Parcel boundaries • Parcel annotations • Other cadastral features • Planimetrics • Edge-of-pavement (EOP) • Hydrology • Streams • Lakes, rivers, and shorelines

  9. Tennessee Base MapSource Data (cont.) • Street centerlines • Administrative boundaries • County and city

  10. Tennessee Base Map Topography Source Data • Two different DTM products: standard and high accuracy (HA) • Standard DTM vs. High Accuracy DTM • Standard produces the orthophoto • HA produce 10’ contours for 400’ scale and 2’ contours for 100’ scale • FEMA subcontractors use DTMs to produce contours • Modify DFIRM for more accurate depiction of floodway boundaries

  11. TNBMP – Digital Terrain Model

  12. Other DFIRM Data Sources • Local Government • Utilities • Planning • Engineering • GIS departments • Tennessee Department of Transportation • Tennessee Valley Authority (TVA) & Corps of Engineers • Flood Studies • Contours • Anecdotal Information • Structure Elevations

  13. Benefits of DFIRM Product • Increase quality, reliability, and availability of flood data and flood hazard maps • Provide timely flood hazard information • Enhance ability to manage risks and issues locally • Provides a comprehensive approach to economic development, mitigation planning, and emergency response

  14. Benefits of DFIRM Product (cont.) • Provide detailed information for builders and developers for making decisions • Flood risks and Flood hazards are demonstrated more efficiently for local officials and community planners • Provide insurance agents, companies, and lending institutions updated flood map information resulting in fair and equitable insurance rates

  15. Enterprise GIS Development • How can State agencies create and maintain spatial data once and use (share) it many times? • The “Tennessee Map” (TNMap)

  16. The Tennessee Map (TNMap): Enterprise GIS Architecture • Goals • Develop enterprise GIS infrastructure to provide secure, usable, and easy access to TNBMP data • Provide State agencies with ability to publish data to enterprise GIS • Support vision of USGS’ National Map and NSDI • Identify data stewards, reduce or eliminate redundant GIS data collection

  17. The Tennessee Map (TNMap): Enterprise GIS Architecture TNMap…More than just a map • Geo-portal application • Base Map Data Repository • Shared GIS infrastructure for application hosting • Access: Public, State GIS users TNMap portal demonstration…

  18. Tabular GIS Analysis + GIS Data Workflow Base Map Data + = Custom GIS Data

  19. State GIS Data Hazmat / Schools / Hospital locations Environmental / Conservation features City / County / Admin. Boundaries (OIR GIS) Streets / Rivers / Land Features (OIR GIS) Property Boundaries (OIR GIS) Imagery / Elevation (OIR GIS)

  20. OIR-GIS/TDOT - Partnership • TDOT Modernizing Equipment • Digital camera suitable for ortho photo production • Training staff on new photogrammetry production req. • ortho acquisition for ¼ of State annually • OIR-GISresponsiblefordata hosting and distribution • TNMap enterprise GIS • Dissemination to local government • 2008 Acquisition: Region 4 (West TN)

  21. FEMA Flood Map Modernization:On-line and other Resources • FEMA Map Service Center: • https://msc.fema.gov/ • FEMA Mapping Information Platform: • https://hazards.fema.gov/ • Administrative Questions: • Stan Harrison, Reg. Director, ECD Local Planning 423-434-6476

  22. Thank you…. • Contact Information: • Dennis Pedersen, Director, GIS Services312 8th Avenue North16th Floor, WRS Tennessee TowerNashville, TN 37243-0288 • E-mail: dennis.pedersen@state.tn.us • Phone: 615-741-9356 http://tnmap.state.tn.us/portal

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