About HEC-RAS

HEC-RAS is a public domain hydraulic modelling software application developed by the U.S. Army Corps of Engineers Hydrologic Engineering Centre. Following are some downloads and links relevant to HEC-RAS 5.0 and comparisons to other 2D models:

Since the last official release of HEC-RAS 4.1 over five years ago, the U.S. Army Corps of Engineers’ Hydrologic Engineering Centre has been integrating 2-dimensional flow, unsteady sediment transport, and other new capabilities into the newly released Version 5.0. New features in HEC-RAS 5.0 include:

  • Two-dimensional and combined one- and two-dimensional unsteady flow modelling
  • New HEC-RAS Mapper capabilities and enhancements
  • Automated Manning’s n value calibration for one-dimensional unsteady flow
  • Simplified physical breaching algorithm for dams and levees
  • Breach width and development time calculator
  • New hydraulic outlet features for inline structures
  • Sediment transport modelling enhancements, including reservoir flushing and sluicing, as well as channel stability using BSTEM integrated within HEC-RAS
  • Water quality modelling enhancements
  • New 2D user’s manual
  • New example applications
  • Updated reference manuals and help systems
  • Numerous bug fixes
  • Increased flexibility in defining and modifying 2D meshes via user-defined break lines
  • Georeferencing of lateral structures for combined 1D-2D connections
  • 2D rain-on-grid with precipitation boundary conditions
  • TIN-based sloping water surface technique to show spatial results inside of RAS Mapper
  • More flexible internal hydraulic structures
  • Improvements to the stability of connecting 1D reaches into and out of 2D flow areas
  • Unsteady sediment transport

For more details, see What’s New in HEC-RAS and this LinkedIn post by David Markwood. Here’s a piece about the history of HEC-RAS.

Here are some instructional videos and tutorials online:

        • Why hydraulic modelling? (Love this one…especially since I’ve been using the alluvial fans on Mars in my lectures for years now)

        • Newberry’s introduction to 2D modelling

        • Basic tutorial on setting up a HEC-RAS model by Mr. Isaac Wait

        • HEC-GeoRAS floodplain mapping tutorial by Mr. Yassir Abduljaleel

        • Example of a coupled 1D-2D HEC-RAS model by Marton

HEC-RAS_Collage_Surface_Water_Dot_Biz

 

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Links and Downloads

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