I'd like to know how to make curved rivers. Straight rivers are no fun, don't look good, and more bad stuff. :)
Also I know for JK2 to make water you used caulk_nonsolid and applied water to the top and bottom only. For JKA do you just apply water to the whole brush?
Curved rivers: I don't know.
2nd question: You apply caulk_water or something to the unseen surfaces, like the bottom I think.
Make a patch mesh (Curves menu). Press V after it's made and drag the points around to curve it...you'll need to put a brush underneath it afterwards totally covered in caulk_water so it actually looks like water if ppl go under it.
Or follow Raven's example from the first mission, and use a river so undeep you can't go under it.