I am getting ready to attend Savio's water feature institute Thursday and Friday. I am really pumped about it. Have any of you ever been? You might want to look it up in your area. Their trainer has a waterfall company that is internationally sought after and does multi-million dollar water features. I consider him to be the best of the best in natural design. The last time I checked I was one of only 10 contractors that were signed up so It should be some good hands on training. Here is a link about it in case any of you are interested in attending this one or finding on in your area: http://www.howgoodcanyouget.com/ The river on the home page was built by Rick Bartel, the trainer for Savio. Pretty awesome.