The data reveal that even though human-managed reservoirs comprise only a small percentage of all water bodies, they account for 57% of the total seasonal water storage changes globally. “We tend to think of the water cycle as a purely natural system: Rain and snowmelt run into rivers, which run to the ocean where evaporation starts the whole cycle again,” said Sarah Cooley, a postdoctoral researcher at Stanford University who launched the research project while a graduate student at Brown University. “But humans are actually intervening substantially in that cycle. Our work demonstrates that humans are responsible for a majority of the seasonal surface water storage variability on Earth.”
https://phys.org/news/2021-03-humans-ups-downs-freshwater-storage.html
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