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I forgot to mention before that it is important to check with your State's dam safety program. They may require one particular program over another, or they may have recommendations as to which program should be used in which situations. The State of Washington's dam safety program has some...

I have had training in both HMS and RAS for dam breach analysis. I recommend that you stick with HEC-RAS for your dam breach analysis. HMS provides a simplistic breach routing. You can't put roads, bridges, downstream structures, culverts, etc. in HMS. Since your post indicated that you may...

Your question is hard to answer without looking at the geometric data but I'll throw out some suggestions to try (disclaimer - I've never had that particular error message while analyizing a dam breach in RAS). First of all is your dam set up as an in-line structure or as a lateral structure...

I can't answer your first question. How did each analysis run? Did you run both in steady flow (no breach) first and what error messages and warnings did you get? Have you tried a breach analysis run and did the model crash? Regarding the second question, it might be better to ignore the...

I'm a little confused by your description of your hydraulic structure - I think you are describing what I call a riser and conduit with the water entering through the top (rather than through a side opening), falling down to the bottom of the riser and then exiting via the conduit which goes...