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Hmmm. Thanks for posting the how-to and sample. Heavy stuff. Because I'm not a computer programmer, I think I'll stick to opening the .basin files as text and printing.

queque, for your demonstration project, will you use a guaged basin to compare modeled estimates to recorded events? I too have used both HydroCAD and HEC-HMS to see how the results compared. They were quite different in peak flows perhaps due to an apparent different treatment of the...

Thanks to you both for your replies. I looked at the time step results for both and it looks as though the HydroCAD model absorbs more of the initial rainfall (3 hours of a 24 hour storm without runoff) while HMS starts yielding runoff after 11 minutes. Also of note: runoff for large sheds...

Hello All, I'm working on a 6 sq. mi. drainage study. I first ran HEC-HMS, then HydroCAD to get a quick sense of the storage volume required. The numbers were significantly different (2800 cfs vs. 2400 cfs) and I've set them up to use the same calculation methods. I'm using SCS unit...