Quanon

Waterfalls are done through animated textures.

In 3D its nothing more then a few bended planes. You can find some waterfall textures in the Dantooine part or if you're doing something for TSL, look for the Dxun textures.

Of course, some emitters might add the finale touch, though I need to look that up. I plan on having a waterfall in my Korriban canyon.