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Application of GIS Tools for Hydraulic Modeling

Application of GIS Tools for Hydraulic Modeling. Overview. Introduction to floodplain mapping Why use GIS? Problems Tools and Data Process Results Future Questions. Floodplain Mapping Process. Gather Data Hydrologic Analysis Hydraulic Analysis

hyacinth-everett
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Application of GIS Tools for Hydraulic Modeling

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  1. Application of GIS Tools for Hydraulic Modeling

  2. Overview • Introduction to floodplain mapping • Why use GIS? • Problems • Tools and Data • Process • Results • Future • Questions

  3. Floodplain Mapping Process • Gather Data • Hydrologic Analysis • Hydraulic Analysis • Map Floodplain Using Outputs and Base Maps

  4. Why Use GIS? • Delineation of watershed boundaries and parameter estimation is simplified • Input of topographic data far less labor intensive • Import and Export of data between ArcView and HEC-HMS and HEC-RAS is convenient • Amount of labor associated with hand delineation makes adjustments cost-prohibitive

  5. Problems of GIS • Gathering data sufficiently accurate for terrain modeling • Significant processing time due to size of datasets • Matching datasets with different projections

  6. GIS Tools and Data Required • Spatial Analyst • 3-D Analyst • HEC-GeoRAS • HEC-RAS 3.0 Tools Data • Triangulated Irregular Network of Clear Creek

  7. 3-D Analyst Extension

  8. 3-D Analyst Extension

  9. Hydrologic Analysis • Calculate Parameters • Enter into HEC-HMS • Get Flow Data for Later Use in HEC-RAS

  10. Process • Load GeoRAS Extension for ArcView

  11. Terrain Model • Generate TIN

  12. Terrain Model • Create Contours

  13. Hydraulic Process • Identify Channel Centerline

  14. Hydraulic Process • Draw Right and Left Banks

  15. Hydraulic Process • Draw Flowpaths for Channel and Overbanks

  16. Hydraulic Process • Insert Desired Cross Section Lines

  17. Hydraulic Process • Curves in Stream Calculated using Flowpaths

  18. Prepare GIS Data for Export • HEC-GeoRas Theme Setup

  19. Creating RAS/GIS Import File • Stream/Reach Names • Stationing • Bank Stations • Reach Names • Manning’s ‘n’ Values • Cross Section Elevations

  20. Importing GeoRAS Data • Create New HEC-RAS Project • Import GIS Geometry Data

  21. Using HEC-RAS • Add data for hydraulic structures • Add roughness values • Input flow data • View results • Export back to GIS

  22. Create Flow Depth Grid

  23. Analyze Results DetentionPond Main Channel

  24. Comparison of Flows 5000 CFS 2500 CFS

  25. Questions ???

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