Hi, I just came across your question while looking up something else for VRTs, but thought I should mention that RAS mapper can export your Depth as an inundation boundary directly as a shapefile very handily, so you can opt to have HECRAS export it to Shapefile and then edit it in ARCGIS. I know it's six months or so late, but hopefully it will help if you have this issue in the future.
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