HEC-RAS 3.0 Input Data and Demo

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HEC-RAS 3.0 Input Dataand Demo

• Presented By
• Kevin Donnelly

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HEC-RAS Data Requirements

• Cross Section Geometry and Characteristics
• Bridge and Culvert Information
• Steady or Unsteady Flow Data
• Plan Information

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Cross Section Geometry and Characteristics

• Import UNET cross section data into RAS

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Cross Section Geometry and Characteristics

• Export data to GIS using a modified version of
  the procedure developed by former graduate
  student, Eric Tate (Learn more during project
  final presentation)
• Aligns cross sections with known points (ex.
  bridges)
• Alignment and location was based upon Halff
  Associates location map

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Cross Section Geometry and Characteristics

• Combine with 2-foot contour data and a 30-meter
  DEM erasing overlapping data
• Generate a TIN (Triangular Irregular Network)
  creating a 3-D surface

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Cross Section Geometry and Characteristics
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Cross Section Geometry and Characteristics

• Recut Cross Sections Using Geo-RAS
• Import Cross Sections Into HEC-RAS

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Unsteady Flow Data

• Import data from HEC-DSS file format
• DSS file generated from LCRA Hydromet and gauge
  data
• Four gauges used to set flow and stage boundary
  conditions at downstream and all upstream
  locations
• Modeled heavy rain that occurred the first two
  weeks of November 2000

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Unsteady Flow Data