It automates the tedious process of extracting river geometry, reducing the time required for creating HEC-RAS models. Furthermore, it allows users to import HEC-RAS simulation results back into ArcGIS for mapping and visualization of water surface elevations and flood extents. Key Capabilities:
Draw along both edges of the active channel. Direction does not matter here, but consistency helps.
After installation, you must activate the extension within ArcMap:
ArcGIS Desktop 10.8 (Basic, Standard, or Advanced). hec georas for arcgis 10.8
Run RAS Geometry > Stream Centerline Attributes > Topology to calculate river stations.
The stream centerline must be digitized in the direction of flow, starting at the upstream end of each reach and ending at junctions or the downstream model boundary.
Because HEC-GeoRAS relies on specific COM components, follow these steps exactly to avoid installation errors. Step 1: Install Background Prerequisites It automates the tedious process of extracting river
HEC-GeoRAS is a set of GIS tools that allows users to create a from digital terrain data (such as a DEM or TIN) and GIS layers (river centerlines, bank lines, cross-sections).
Open ArcMap, navigate to Customize > Extensions , and check the boxes for 3D Analyst and Spatial Analyst . Close ArcMap.
Execute the hydraulic plan. Once complete, review the water surface profiles to ensure the model has converged properly without errors. Direction does not matter here, but consistency helps
: The most compatible version for this environment is HEC-GeoRAS 10.8.0.3 .
| Issue | Details | |-------|---------| | | HEC will not test or verify any version of HEC‑GeoRAS on ArcGIS releases newer than 10.2.1. “Version 10.8” is an untested community build. If you encounter a bug, no official technical support is available. | | No future development | HEC has shifted its GIS capabilities directly into HEC‑RAS itself. Starting with HEC‑RAS 5.0.4 (released in 2018), many HEC‑GeoRAS pre‑processing functions (e.g., terrain pre‑processing for 2D flow areas) are now built into the RAS Mapper module. Consequently, HEC‑GeoRAS is effectively deprecated for new projects. | | ArcGIS Pro incompatibility | HEC‑GeoRAS is designed for ArcMap (the classic 32‑bit ArcGIS Desktop). It does not work natively with ArcGIS Pro . While some users have attempted to run it through compatibility layers, there is no official or stable solution. | | 32‑bit architecture | HEC‑GeoRAS is a 32‑bit extension, which can cause memory limitations when processing extremely large DEMs. | | Requires separate HEC‑RAS installation | The extension only prepares and visualises data; hydraulic computations must be performed outside in the HEC‑RAS application. |