I built mine out of my old redwood fence. I used the pieces the the
bugs didn't eat. No plans, either. Just picked a size and made it!!

http://www.bunchobikes.com/pond118.jpg
http://www.bunchobikes.com/pond119.jpg
http://www.bunchobikes.com/pond120.jpg

Mo http://www.bunchobikes.com/pond6.htm

Bill Stock wrote:

What kind of wood for a water wheel, Cedar? It has to be non toxic, as I'll
have fish in the water.

Also the pictures I've seen, seem to have the sides built of 4 larger
pieces, ie. plywood. I can't see plywood holding up for long, even if it's
marine plywood.