A good answer is to cover the channels with solar panels -- a win-win that cools the panels and reduces evaporation: https://www.nature.com/articles/s41893-021

A good answer is to cover the channels with solar panels -- a win-win that cools the panels and reduces evaporation: https://www.nature.com/articles/s41893-021-00693-8 https://www.nature.com/articles/s41893-021-00693-8