There's a reflective shader on the rocks, a terrain shader on the 'fall' and a water shader on the water falling over that terrain. (the waterfall is just a slightly bigger version of the terrain).
There are no image maps, as I said above, this is a TG internal waterfall, no imports.
I'll upload it when I can and give a full description of how I made it then. So far I only have 2 projects in vol.3. I'm going for 5 so, a week or two at most, I'd say.