Engineers can now layout bridges directly inside 2D flow areas, utilizing a 1D-based "family of curves" to compute hydraulic forces across 2D mesh faces.
. While newer versions (like 6.6 or 2025 alpha) are available, version 6.0 is archived on the same downloads page for those who need it. Hydrologic Engineering Center (.mil) The Digital River: A Story of Data and Flow hec ras 6.0 download
| Feature | Description | |---------|-------------| | | Full Saint-Venant or Diffusion wave equations for overbank flooding, urban areas, and dam breaks. | | RAS Mapper | GIS-based mesh generation, terrain manipulation, and result visualization (depth, velocity, inundation). | | Sub-Grid Bathymetry | Allows coarser computational mesh while preserving detailed channel geometry—speed up to 10x faster. | | Sediment Transport | Mixed-size sediment load, bed sorting, armoring, and hydraulic dredging. | | Dam Break Analysis | Embedded capabilities for breach formation, reservoir routing, and downstream hazard mapping. | | Stable Unsteady Flow | Improved numerical schemes (two-step predictor-corrector) reduce instability. | Engineers can now layout bridges directly inside 2D
