SHANGHAI: Nearly 50,000 large dams worldwide could lose more than a quarter of their storage capacity by 2050 as a result of sedimentation build-ups, eroding global water and energy security, according to United Nations research on Wednesday. Dam capacity is expected to drop from 6 trillion cubic metres (c
SHANGHAI: Nearly 50,000 large dams worldwide could lose more than a quarter of their storage capacity by 2050 as a result of sedimentation build-ups, eroding global water and energy security, according to United Nations research on Wednesday.
Silt accumulates in reservoirs as a result of the disruption of natural water flows. It can cause damage to hydroelectric turbines and cut power generation. The U.N. study looked at data from more than 47,000 dams in 150 countries and said 16 per cent of original capacity had already been lost. It said the United States is facing losses of 34 per cent by 2050, with Brazil estimated to lose 23 per cent, India 26 per cent and China 20 per cent.
Vladimir Smakhtin, director of the UN University's Institute for Water, Environment and Health and one of the study's authors, said dam building worldwide had already declined significantly, with around 50 a year now being built, compared to 1,000 in the middle of the last century.
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