Putting solar panels over irrigation canals seemed like a win-win idea: we get electricity while reducing evaporation. It turns out it’s a win-win-win idea. Canals in California that have done this have generated electricity, reduced evaporation by a stunning 50% to 70%, and saved irrigation districts bunches of money by causing algae and aquatic weed growth to drop by 85%. https://www.ecoportal.net/en/solar-panels-built-working-irrigation-canals/33890/