We released an update to ReFH2 (v4.0.8560) in June 2023.

This version and ones that postdate it (4.0, 4.1 etc) it are not compatible with Autodesk ICM versions lower than ICM 2024.2, due to a change in the format of data exported by ReFH2.

If ICM displays an error message stating ‘ReFH2 calculation failed: ReFH2 hydrograph data is incompatible/invalid…’ ensure you have updated to a new version of ICM version 2024.2 or later. Please see this Autodesk help article (section under FEH13) for further information.