Is it possible in the first place?

If so, how would I go about doing this (assuming I already have the necessary elements to create water, I'm following Rippentuck's tut)?

i hate to tell you i don't think it's possible because one sbf2 doesn't have any physics so the water wouldn't "flow" downhill and two because you cannot tilt water layers or have more than one your best bet would be to map the terrain in a way that it appears the water flow from a high point to a low point or use an object like a water fall but other than that it's pretty not doable

yankfan is right, you could only do that with an object like a waterfall

I see. Ok, thanks guys.

Or make an huge effect, or model with scrolling texture, but then it won't harm anyone. The collision could still be done through odf lines though.

you could make a damage region similar to that of water under it...

That's Ok, guys, I don't know how to do any of that stuff. I think it would be easier to put a model at the top anyway .