<font color="blue"> besides if you have that much wind the air stone will not be needed </font>
Now, that's an interesting comment I hadn't heard before, and shows my ignorance about ponds. From everything I've read, oxygen levels get stratified in ponds, and something mechanical is needed to circulate the water. We do plan a fountain, primarily because my wife thinks it's pretty (and I secretly agree with her), and I planned to be sure that it picked up water deep enough to also aerate the pond. But, my pond is probably 14' deep in the middle, and the deepest fountain pickup I've seen is around 7' or so (with the possible exception of the sump pump fountain described above, which I may try), so I've automatically been assuming I may also need an air stone to adequately aerate the pond all the way to the bottom.
Now, you make the entirely reasonable assertion that ponds may aerate themselves with enough wind. Food for thought. I'd like to know more.
Here's what it will come down to. I'm 64 years old and don't fish. I'm at the point in my life where I do things because I want to, not because I have to, subject to my budget and physical limitations. And, that's where rationalizations come in.
The pond is rationalized because it was a much cheaper alternative to hauling in necessary fill; it's also there because it's pretty. It has a feed from the well and a float valve to keep the water level the same all the time, rationalized by mosquito control, but mostly because I like it that way. It will have a portion of the bank in grass, for access and a clear view, and a portion of the banks in natural landscaping, rationalized by something or other (the wife takes care of the environmental side) and attractive. It will have a fountain, rationalized by aeration, but primarily because it's pretty. Ideally, it will also have a windmill, rationalized by additional aeration, but also because I like the looks. If I have one, it will be moderately serious, 16' to 20' tower, rationalized because it works better, but really because it looks better. I think you get the drift.
Now despite my rationalization, none of these things are necessary, so budget starts to rear it's ugly head. The pond was a no-brainer because it was cheaper than the alternative. But, I estimate it will cost about $30 per month on average to maintain the water level, plus wear and tear on the well pump. The fountain is going to be between $1K and $2K, plus installation, and will cost around $30 per month to operate, plus maintenance and replacement costs. And, while windmills are cheap to operate, they're fairly pricey to buy. I guess I'm just going to have to wait and see how the budget shakes out before I promise myself I'll have a windmill...but, they sure are attractive...I may need a really good rationalization. /forums/images/graemlins/grin.gif /forums/images/graemlins/blush.gif