World’s large dams could lose quarter of capacity by 2050, says UN...

... by mid-century, dams and reservoirs will lose about 1.65 Trillion cubic metres of water storage capacity to sediment.

The figure is close to the combined annual water use of India, China, Indonesia, France and Canada.

That is important, the researchers say, because these big dams are a key source of hydroelectricity, flood control, irrigation and drinking water throughout the world.
https://www.theguardian.com/environment/2023/jan/11/worlds-large-dams-could-lose-quarter-of-capacity-by-2050-says-un?CMP=share_btn_tw