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Hi SBender,
if you are sure that the flow reamians in the channel and you don't have any retention area in case of a flood event, then HEC-Ras is enough for the dambreak simulation . However I don't know how diffusive the HEC dambreak algorithm is?
In othercase and for best resaults, it is better to use a 2D model (see BASEMENT in web).
good luck
Dave
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