Struggling with the hydrology in HEC HMS…can someone DM me please? Not really, however you can look through the dam break example problems. I am facing many difficulties in filling different menus and running the program with many errors and warnings. Please, is there any step by step example for dam beak analysis in hecras?
Do you have small enough detailed output interval to see the entire breach form? Are you allowing the simulation to go long enough for the breach to fully form?Ģ. Is there a reason why it isnt performing a full breach? Any tips to correct this?ġ. If you are having stability problems due to an overly steep reach, HMS could be used for routing, but the peak flows should be finally run through steady flow RAS to get the flood inundation extents.Įven though I entered in the Dam Breach Data that the bottom breach elevation goes down to the bottom of the cross section, when I run the model, the breach only goes about halfway down the dam. You could go with full unsteady RAS downstream of the dam and use the techniques I described in the dam breach class to get the final inundation mapping. What I usually suggest is that the breach can be modeled using HMS, but downstream of the dam, RAS should be used. Furthermore, there is no direct method for mapping flood inundation from an HMS model. In short, HMS is okay for routing water from A to B, but if you are interested at all in what is happening between A and B, HMS is not appropriate. Plus, backwater will not be fully accounted for using any of the HMS routing techniques-meaning you can not simulate flow attenuation properly. HMS uses hydrologic streamflow routing which is a simplification of full dynamic routing. However, routing the breach outflow downstream using HMS is very limited. Using HMS to perform a dam breach has its advantages, namely that it is easy to set up, the data requirements are minimal, and it is numerically stable.
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