I would think that the best use for a windmill would be to generate electricity into a storage system, then utilize an electric pump. Cost would be a bit more tho.

There is a company a few blocks away that builds small windmills. I am seeing these pop up around here. One of these days, I'll stop in and get some info.

I sold a couple new 1hp 90VDC motors to a guy not too far from here. (ebay) He said he builds windmills, and these were the motors he uses. He got a really good deal as those were eeeeeekspensive motors. I should have kept them cry

(they were replacement motors for my Burgmaster CNC, which I scrapped)