“Worldwide, more water evaporates from reservoirs than is consumed, and the losses are especially acute in hot, dry regions. The idea of a coating to slow evaporation has been floated for decades.” (http://www.nature.com/news/slick-idea-proposed-to-stretch-water-supplies-1.17012)
Research will show if a thin layer of coconut oil is more effective than a floating idea.
“Some small mammal species on forest islands, created by a hydroelectric reservoir, in Thailand became extinct in just five years.” (http://www.bbc.co.uk/news/science-environment-24229723)
Not because of being surrounded by water and electricity.
To avoid silt from storm run-off contaminating drinking water, “New York’s reservoirs will be managed by souped-up software.” (http://www.nature.com/news/forecasts-turn-tide-on-silt-1.13576)
2 trillion litres of Gazpacho.