Hi, I think I can help a bit with my limited knowledge, check out my level design section of this site
www.odovedesign.comI did a very simple river and waterfall and conveyed water motion not too badly, if you employ some of the pulsating flowing effects on a very basic level then work up from there, you may find that it is easier to do the finer details later, if you follow
I am not pretending to be better though! this is very good! It could just move more clearly