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North Carolina Floodplain Mapping State of North Carolina

North Carolina Floodplain Mapping State of North Carolina. Web-Based Survey. Web-Based Survey. Survey ran from Jan. 16 - Feb. 20 Ten different sections IT Data Applications. Web-Based Survey. Responses. As of Feb. 5, 2001. Responses. As of Feb. 20, 2001. Responses.

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North Carolina Floodplain Mapping State of North Carolina

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  1. North Carolina Floodplain Mapping State of North Carolina

  2. Web-Based Survey

  3. Web-Based Survey • Survey ran from Jan. 16 - Feb. 20 • Ten different sections • IT • Data • Applications

  4. Web-Based Survey

  5. Responses As of Feb. 5, 2001

  6. Responses As of Feb. 20, 2001

  7. Responses As of Feb. 10, 2001 County responded to survey

  8. General Information • 37% of the organizations - Providers • 87% of the organizations - Users As of Feb. 20, 2001

  9. General Information IT • Operating Systems: • Win 95/98 44.9% • Win NT 61.0% • Win 2000 30.5% • UNIX 22.0% • AIX 7.6% • RS6000 5.9% • MAC OS 4.2% • Other 13.5%(not specified) As of Feb. 20, 2001

  10. General Information IT • Network Connections • Modem (28.8-56.6K) 17.8% • 128 K 5.9% • DSL 6.8% • Cable modem 5.8% • T1 50.8% • > T1 13.6% • Don’t know 11.9% As of Feb. 20, 2001

  11. General Information IT • GIS Software • 92.4% uses GIS or CAD As of Feb. 20, 2001

  12. General Information IT • GIS Software • ArcInfo 68.6% • ArcView 83.9% • GenaMap 0.8% • Erdas Imagine 5.9% • MapInfo 11.9% • Small World <1.0% • SAS 3.4% • AutoCAD 27.1% • ArcCAD 3.4% • Microstation 4.2% As of Feb. 20, 2001

  13. DFIRM Results As of Feb. 5, 2001

  14. DFIRM Results

  15. Elevation Data

  16. Elevation Data

  17. Flood Data

  18. Flood Data

  19. Flood Data

  20. Engineering Data

  21. Engineering Data

  22. Survey Data

  23. Survey Data

  24. Survey Data

  25. Base Data

  26. Base Data

  27. Potential Applications

  28. Potential Applications

  29. Additional Issues • Requests • Well defined hydrologic units • CGIA offer desktop GIS products • Canopy height • Digital historic aerial photographs

  30. Conclusions (prelim.) • WWW based availability of Floodplain related data would increase its usage • Data access by: map panel, custom area and browser are preferred • Data available in shape file and .e00 format • Images: MrSID, JPEG and TIFF format • Applications: Download data, real-time flood warning, Property/Flood boundary look-up

  31. Interview Questions

  32. Interview • Who do you represent? • How do you anticipate you will interact with the system? • What is the most important aspect of this project to you?

  33. Applications • Download data in native file types and coordinate systems • This would allow users to download floodplain data in a GIS format for use in spatial analysis and overlay mapping. • Property / flood boundary lookup • The user will enter an address or parcel number and the system will zoom to the area and show a map with the flood boundary and the address. This will assist local communities in complying with existing flood ordinances. Example uses would include identifying homes in the 100-year floodplain or locating properties in the FEMA Floodway. • Approximate floodplain mapping delineator • This would determine an approximate flood elevation at any location where the stream is not studied by FEMA or the upcoming NC Floodplain Project.

  34. Applications • Real time flood warning and forecasting • View in real-time streams that are at or approaching flood stage and have the ability to predict when a river will reach its peak and the predicted stage at peak. Using these predicted stages - view a map of the floodplain resulting in this flood stage. View which roads are closed or overtopped. • Spill modeling • A live application which would allow emergency response centers to respond to a hazardous waste spill and direct clean up crews to a particular location. The application will trace to spill to the extents of the State line and will give estimated times of arrival at various locations. • Evaluation of rezoning requests • The impacts of rezoning requests could be evaluated using the GIS and modeling tools to determine the impacts to flood elevations based on rezoning requests and the following development.

  35. Applications • Rainfall maps • View historical flooding rainfall data spatially distributed across the state. View real time rainfall data during a storm. The ability to print our download images of the rainfall depths and intensities. • Inventory management • This application would allow users to view survey and attribute information about bridges, culverts and dams along a river or stream. Information available will include size, shape, number of culverts, length, bridge span, dam elevation, overtopping elevation, frequency of overtopping, etc. Users could also view and download digital pictures of the structure. • Water quality analysis • Using data from computer models in the GIS, users could view impaired watersheds and streams based on given pollutants (nitrogen, sediment, phosphorus, etc)

  36. Applications • Detailed Tracking of Data • Allow the State to determine who has a particular type of data so that if it is revised. • Work order management • Assist the local communities comply with NPDES. The NC Floodplain Project will organize all of the terrain data as well as large structures. • QA / QC of flood data • Allow stakeholders to check the quality of the data for their own purposes. • Upload flood data revisions • Allow stakeholders to upload new data that the State may use to update the flood analysis. Examples of updates would include new culverts or bridges, modifications to existing culverts and bridges, etc

  37. North Carolina Floodplain Mapping State of North Carolina Baker

  38. Agenda • Welcome and Introduction • Overview Web-Based Survey • Interviews • Wrap-up

  39. FY 2003 FY2001 FY 2002 Work Plan

  40. Contents • Responses to the Survey • Results of the Survey • Questions and Answers

  41. Survey Link • ps.esri.com/ncflood/survey/

  42. Web-Based Survey

  43. Web-Based Survey

  44. Today Final Presentation FEMA Interviews System Design CTS meeting Next steps

  45. Thank you for participating in the interviews

  46. Other Information • Hours saved: -3 - 100s • Peak loads: 5-20 • Peak Number of Users: 1 - 30

  47. Additional Issues • Survey • Grueling • Thorough/Overwhelming • Too long • Pleased that the State is working on this project

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