One of the liabilities of the new HDF5 output is that HEC-RAS does not release these until the end of the simulation. Users cannot view these files until the run is complete. Additionally, if the model crashes, it will not generate a final output file to help troubleshoot the simulation.

Users can request HEC-RAS to write intermediate results, so results will be available if the model crashes. This will create stable HDF5 output file when HEC-RAS crashes, but it involves saving and closing the file each time step, so this feature will increase run times substantially and is off by default.

To request intermediate HDF5 writes to access output after a crash, go to *Optionsīƒ Output Options* in the Unsteady Flow Analysis editor. Select the HDF5 Write Parameters and check the Commit Writes box.
Select final HDF5 writes after each time step to access HDF5 output after an HEC-RAS crash (this will increase run times).