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