The Japanese are covering one of their reservoirs with floating photo-voltaic cells that not only make electricity, but also retard evaporation. I saw where the Californians filled one with small, black floating balls to retard evaporation. I never heard how that turned out.
(I hope I can still use the word “retard”.)
The Japanese are covering one of their reservoirs with floating photo-voltaic cells that not only make electricity, but also retard evaporation.
But the big question is: Can you water ski over them?
If you are adjusting the timing on your classic car, yes.