Is this possible in HEC HMS?

[tpcolson]

Is it possible to define TWO frequency storm met models in HMS and assign one of them to one sub-watershed (or a few) and one of them to the remaining sub-watersheds? The question is posed in the context of a large study area with highly variable rainfall from one end to the other.

 

[Crystalct1]

The quick answer is no. This would have to be done with two seperate runs. One run can only have 1 each of basin model, meteorological, and control. You could possibly change your loss or transform method for some of the subbasins to model the differing effects. Other than that, I do not know how you would do this in any of the common software. Maybe try using gridded precipitation?