DrDave said:
Very nice. Did you build it from drawings or plans? Are you concerned that water splash may excape the pond?
I couldn't really find any good plans online, though there were plenty of example pictures of water wheels to go by. I mostly winged it, after going through some designs in my head and on paper. It's just made from 4" x 1/2" oak pieces from Home Depot, and I sealed it well with spar varnish.
I am concerned about splashing, especially splashback, which is why I made the buckets/paddles fairly shallow, and tapered. However they may be a bit too shallow, we'll see. Fortunately it's got some good room for adaptation if necessary. Yesterday in testing it seemed to do pretty well in terms of splashing actually - pretty much all the water stayed within the lower pool. I do plan to build up the rocks some around it as well, to catch any additional splashing.
I do figure that between the three falls - evaporation and splashing - I will have to keep adding water over time (already do actually). Fortunately I have a downspout right next to it I can use, though I'm leery of that - might just run that into a container and not directly into the pond.
One question - anyone aware of any kind of good water-level trip-valve, for a smaller pond? Seems like something similar to what's found in a toilet tank would be good, though something more hide-able and/or better looking.