This post introduces three new commands added in Revision 2321 (November 2021) for tracking fluid volumes in selected elements within a model. These commands allow users to calculate the total fluid volume for both the porous media and surface flow domains:

This post describes how to use the flux nodal boundary condition modifier: nodal flux reduction by pressure head. This modifier is used when the flux rate is set higher than the available water, which can cause numerical instability and model crashes.

This post introduces the new zero-order source with partitioning command, added to HGS in revision 2291 (August 2021 update). This command enables more realistic modeling of gaseous species production in the unsaturated zone (USZ), considering the partitioning between the aqueous and gas phases based on solubility and water saturation.