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HEC-GEORAS on a small stream in North Branch, Clear Creek

HEC-GEORAS on a small stream in North Branch, Clear Creek. Zhihao Wang Sep 2011. HEC-RAS perform one-dimensional steady and unsteady flow river hydraulics calculations HEC- GeoRAS pre- and/or post-process GIS data and HEC-RAS results for flood inundation mapping using ArcGIS .

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HEC-GEORAS on a small stream in North Branch, Clear Creek

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  1. HEC-GEORAS on a small stream in North Branch, Clear Creek Zhihao Wang Sep 2011

  2. HEC-RAS • perform one-dimensional steady and unsteady flow river hydraulics calculations • HEC-GeoRAS • pre- and/or post-process GIS data and HEC-RAS results for flood inundation mapping using ArcGIS

  3. HEC-GeoRAS creates a file of geometric data for import into HEC-RAS, and enables viewing of exported results from RAS. Pre-process Post-process

  4. HEC-GeoRAS requires a DTM (digital terrain model) in the form of TIN or GRID. TIN of part of the North branch, Clear Creek

  5. 30mDEM 8mDEM, 23m z tolerance 8mDEM, 1m z tolerance

  6. Flow rate generated by GeoWEPP (referred to as runoff)

  7. Create RAS layers: • Stream centerlines, Banks, Flow paths, Cross section cutlines, other optional layers • By creating empty layers and digitize manually Banks Stream centerlines Flow paths

  8. Cross section cutlines

  9. Assign attributes to: • Stream centerlines (names, topology, length) • Flow paths (left/right/center) • Cross section cutlines (river/reach name, bank stations, elevation…)

  10. Manning’s value

  11. Extract GIS data HEC-RAS geometric data

  12. Cross section view in HEC-RAS

  13. Set up the flow rate data

  14. 2-year scenario simulation results Conventional tillage No tillage Conservation tillage

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