[GPK SS10] How to delineate ridgelines and drainage areas of a terrain?

I am working in Geopak SS4, and I have been tasked with finding the drainage areas for a number of small structures.

I know that the Geopak DTM tools have the capability to delineate watersheds and ridgelines. Can I do the same processing on a terrain, or do I need to export all of my terrains back to TINs?

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