NEW version of HGS PREMIUM December 2025 (REVISION 2898)

The HydroGeoSphere Revision 2898 (December 2025) is now available for download.

This month’s update introduces several important refinements to boundary condition handling, raster reading, and cumulative water balance processing. It also marks a major transition in HydroGeoSphere’s post-processing tools, as hsplot is officially deprecated in favor of hgs2vtu. Together, these updates enhance model reliability, usability, and consistency across the HGS ecosystem.

Fix for rain and snowmelt boundary condition

Resolved a bug that occurred when using the elevation temperature relation with the rain and snowmelt boundary condition, improving model stability under temperature-dependent precipitation setups.

Deprecation notices

• The legacy command potential evaporation using transpiration has been deprecated.

• hsplot is now officially deprecated. While it remains temporarily available, it is no longer supported and will be removed in a future release. We strongly recommend all users transition to hgs2vtu, which provides a more powerful and modern post-processing workflow.

hgs2vtu enhancements (see hydrosphere_ref.pdf)

• Added a new option --output-dir that specifies the directory where all output files are written.

• Updated the cumulative water balance options to ensure times in water balance files are monotonically increasing and to allow the initial time to match the first simulation time.

• Improved raster reading to handle NaN no data values more robustly. If a raster file does not define a no data value, one is automatically generated based on the raster data type.

Updates to the rain and snowmelt boundary condition

• Added an error check to ensure all faces belong to the top sheet of the model.

• Added a warning message when default rain and snowmelt parameters are used instead of explicit definitions in the oprops file.

• Updated and clearly documented default parameter values in the Reference Manual for transparency.

Polygon tracking improvements

The following polygon tracking commands now include the total volume of water within both the porous medium layers and surface domains of each polygon:

• fluid mass balance for olf areas using shp file

• fluid mass balance for olf areas using shp file by layer

• fluid mass balance for olf areas for chosen faces

• fluid mass balance for olf areas for chosen faces by layer

Documentation updates
Both the Reference Manual (hydrosphere_ref.pdf) and Theory Manual (hydrosphere_theory.pdf) have been updated to reflect these changes.

You can find details about these new features in the HydroGeoSphere Reference Manual. And as always, we are committed to the continued improvement to the user experience. Do you have suggestions for new commands or improvements to the user experience? Send your ideas to support@aquanty.com!

The latest installers are available on the HGS download page and a full list of changes/updates can be found in the release notes.

Download the December 2025 release of HydroGeoSphere here: https://www.aquanty.com/hgs-download

Review the release notes here: https://www.aquanty.com/updates