A few pratical points,
It will act as a very effective heat exchanger. If you want to keep your heating bills down, only run it when you want it. Unless, of course, you are in somewhere like very hot, eg Neveda where the evaporation will increase instead.

it is a simple way to have a nice place to sit behind a cool veil of water. temprature or style cool?


Other things. Get the brim exactly level. Trying to make it adjustable will be vey hard work.

Bunnahabhain.