Let’s say you’ve got gallons of washwater, and no where to put it. Evaporate it! Devices that facilitate getting water into air are called evapotrons, and Ember is the master of the field. I built one of his wind-driven designs last year, with mixed results.

On the plus side, it did run on wind. On the minus side, the wind has to be blowing pretty much squarely into the windmill for it to turn much. The design is a little fragile, and the pond tends to leak and in heavy wind, splash all over the surface it’s on. I put it on top of a truck to maximize exposure to the sun and wind.

This year I have other plans. I’ve got a couple of 12v bilge pumps, and I will use them to drive water up to trickle over something from which it will evaporate. This, in Ember’s terms, is a “pumped cascade.” More as I figure it out.