Hi windbrand,
One of the long time contributors to this site - 'spacebones', has a couple of items that may fit your request.
http://www.sharecg.com/v/25522/3D-Model/Liquid
http://www.sharecg.com/v/25282/browse/5/3D-Model/Wakes
Theres also this - http://www.sharecg.com/v/19033/related/5/3D-Model/Waterfall-in-Object-form-for-Poser-and-many-more
by 'stacey denman' - check out her other models some are in .vob, some in .obj formats but theres a couple more waterfall type items there.
MAF