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Floodplain Mapping Using AV-RAS

Floodplain Mapping Using AV-RAS. Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin. Objective. AV-RAS is a system of ArcView tools developed in Avenue -- the ArcView programming language -- that:

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Floodplain Mapping Using AV-RAS

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  1. Floodplain Mapping Using AV-RAS Esteban Azagra and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin

  2. Objective • AV-RAS is a system of ArcView tools developed in Avenue -- the ArcView programming language -- that: • extracts hydrologic data from digital terrain data, and • maps the HEC-RAS results back on the digital spatial data

  3. HEC-HMS HEC-RAS Flow discharge Water surface profiles Parameters Schematic AVRas CRWR-PrePro Geometric data ArcView Floodplain Mapping Approach

  4. HEC-HMS HEC-RAS ArcView Digital Spatial Data • Digital spatial data required: • Digital elevation model (DEM). • Vector stream network. • Land use / land cover • Soils

  5. HEC-HMS HEC-RAS ArcView Streams and Watersheds • CRWR-PrePro is used for: • Stream and watershed delineation. • Determination of stream and watershed hydrologic parameters.

  6. HEC-HMS HEC-RAS ArcView HEC-HMS: Flow Determination

  7. HEC-HMS HEC-RAS ArcView HMS-RAS Connection HMS Junctions RAS Cross-sections

  8. HEC-HMS HEC-RAS ArcView HMS-RAS Connection HMS Hydrograph RAS Flow Data (0500, 3559.6)

  9. HEC-HMS HEC-RAS ArcView Digital Terrain Model: TIN • Observed points and • breaklines for • constructing a • triangular irregular • network (TIN).

  10. HEC-HMS HEC-RAS ArcView Digital Terrain Model: TIN • TIN components: • - nodes • - edges • - triangles

  11. HEC-HMS HEC-RAS ArcView Digital Terrain Model: TIN • 3D display of a TIN.

  12. HEC-HMS HEC-RAS ArcView Digital Terrain Model: TIN • Embedding Buildings • into the TIN.

  13. HEC-HMS HEC-RAS ArcView Cross Sections • Stream centerline. • Banks. • Flow paths. • Cross sections.

  14. HEC-HMS HEC-RAS ArcView Cross Sections • Bridges are not captured by the TIN: cross sections should NOT be defined at the bridges.

  15. Hydraulic Modeling with RAS • Cross-sections extracted from the TIN. • RAS stream geometry. HEC-HMS HEC-RAS ArcView

  16. Hydraulic Modeling with RAS • Water surface elevations. HEC-HMS HEC-RAS ArcView

  17. Floodplain Mapping • Floodplain for 500 cfs. HEC-HMS HEC-RAS ArcView

  18. Floodplain Mapping • 2-D floodplain animation (500 – 5,000 cfs).

  19. Floodplain Mapping • 2-D representation of the Central Park detention pond.

  20. Floodplain Mapping • 3-D floodplain animation.

  21. Limitations • Bridge and culvert data has to be entered by hand.

  22. Limitations • The accuracy obtained from TIN data might not be good enough.

  23. Solutions • New technologies (i.e. LADAR) are improving the quality of the digital terrain representations. Source: digital representation of NYC generated by ASI and published by ESRI.

  24. Solutions • New technologies (i.e. LADAR) are improving the quality of the digital terrain representations. Source: digital representation of NYC generated by ASI and published by ESRI.

  25. Conclusions • Automation of floodplain delineation results in time and resource savings. • The lack of subjectivity provides standardized results. • Applications include: • Design of control structures (detention ponds, culverts, bridges, …). • Flood insurance rate determination. • Real-time flood emergency mapping. • The accuracy of the digital terrain model has to be improved. • Some field data will be still required.

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