I’m having trouble running an older version 4.0 RAS unsteady 1D model in the latest release 5.0.5 (as well as other previous version 5 releases). The unsteady flow file includes specified intial flows at every model element as well as internal river station initial stages. It is a very large, dendritic model with pilot channels and pumps.
Problem: The model does not advance past the “initial backwater” computations prior to the simulation. I get a non-specific exit code 157 message. The issue must be due to changes to handling of initial stages and/or flows used during initial backwater calculations between versions 4.0 and 5.0. Anyone have any ideas or can shed some light on this issue?