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Application of GIS Tools for Hydraulic Modeling

Overview. Introduction to floodplain mappingWhy use GIS?ProblemsTools and DataProcessResultsFutureQuestions. Floodplain Mapping Process. Gather DataHydrologic AnalysisHydraulic AnalysisMap Floodplain Using Outputs and Base Maps. Why Use GIS?. Delineation of watershed boundaries and parameter estimation is simplifiedInput of topographic data far less labor intensiveImport and Export of data between ArcView and HEC-HMS and HEC-RAS is convenientAmount of labor associated with hand delineation makes adjustments cost-prohibitive .

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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

    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

    24. Comparison of Flows

    25. Questions ???

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