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Regional Hydraulic Model for the City of Austin

Regional Hydraulic Model for the City of Austin. CE 394 K2 - Surface Water Hydrology Esteban Azagra. Single Creek. Dentritic network. Objectives. Create a “regional hydraulic model” for the city of Austin. Specific goal: flow analysis. Tools.

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Regional Hydraulic Model for the City of Austin

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  1. Regional Hydraulic Model for the City of Austin CE 394 K2 - Surface Water Hydrology Esteban Azagra

  2. Single Creek Dentritic network Objectives • Create a “regional hydraulic model” for the city of Austin. • Specific goal: flow analysis.

  3. Tools • CRWR-PrePro: ArcView preprocessor that extracts information from digital spatial data and creates an input file for non-GIS applications. • HEC-HMS: Hydrologic Modeling System for precipitation-runoff simulation. • HEC-RAS: one-dimensional Hydraulic Model for channel analysis and floodplain determination.

  4. Methodology • Watershed delineation and HMS schematic generation with PrePro. • Generate flows with HEC-HMS. • Compare flows and run HEC-RAS.

  5. Bull Creek Little Bull Creek Sample Area • Branched • Relatively flat • Cross-sections available

  6. Bull Creek Boundaries (City of Austin) • River Reach File 3 Coverage (EPA) • 10 m DEM (City of Austin) • Land Use/Land Cover files (USGS) • Precipitation data (CRWR) • Cross-Sections in GIS format (CRWR) • RAS files (City of Austin) Data required for the Study • STATSGO (USDA-NRCS)

  7. DEM Fill Streams “Burning in” Delineate watersheds Flow dir. Basic Stream Network Flow acc. Control Points, Outlets and Links Working with CRWR-PrePro

  8. Statsgo Vectorization Stream Parameters X = 0.15, V = 1 m/s Computation of the hydrologic parameters CN LULC “Clipping out” Schematic and basin file HMS Working with CRWR-PrePro

  9. Running HEC-HMS(Basin Model)

  10. Flooding analysis based on: • 2, 10, 25, 100 yr • hypothetical storms • 3 hr storm duration Running HEC-HMS(Precipitation Model)

  11. Running HEC-HMS(Control Specifications)

  12. Hydrograph Summary Hydrograph Plot Hydrograph Time Table Running HEC-HMS(Results)

  13. Flow analysis

  14. Conclusions • Differences are too big! • Check City of Austin flow values. • Model calibration? (X, Vs) • Very suitable approach for flow determinations. • Analysis of big areas. • HMS flow values can be exported to RAS.

  15. Future work • GIS representation of flooded areas. • Work with DOQ’s. • AVRAS. • Other approaches (TIN not available).

  16. Questions

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