Last year we had a bunch of grey water leftover, which was a pain and had to be carted out. We've been thinking about various ways to assist in evaporation from low-tech (just making it bigger, laying towels over the edge, etc) to higher tech, but most of the higher tech ideas involve using pumps, which can clog too easily out there in our experience from our outdoor camp shower. So someone (not I) came up with the idea of a solar-powered water wheel, but instead of buckets, it's just flaps of burlap that soak up the water as they pass through the bottom, and then wave that moisture through the air as they pass up and around.
Nothing to clog, low solar power requirements, very little to break. Not sure if we'll get to it before playa time, but anyone tried this or have any comments on why it'd work well or not?