Awhile back I drew up a picture expanding on someone elses design, Although this works on the same principle as a spiral-archemedes pump, it might be easier for you to build this one, over time it has lost some picture quality, because it was done on windows paint.
Anyways he had drawn it up with a crank handle, and I thought that it would be interresting to use a wheel on it, the way it works is the wheel is firmly secured into the stream bed or bank, at the point where the archemedes coil reaches the shaft of the wheel, it has a universal like a socketset one welded between them, so although both shafts are offset it should rotate without much friction.
I'm having some trouble with uploading picture again.
Linda, if it doesn't show up,send me your email address to Torchlithill@yahoo.com, and I'll try to get it to you that way.