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Environment

US reservoirs are evaporating more quickly because of climate change

The rate of evaporation at US reservoirs is speeding up, and could significantly increase by the middle of the century if emissions continue to rise

By James Dinneen

9 April 2023

Lake Mead near the Hoover Dam has been losing water due to an extended drought

Justin Sullivan/Getty Images

Climate change is increasing the rate of evaporation at reservoirs across the US. The effect is most consequential in the Southwest, where reservoir levels are already at record lows amid a megadrought and decades of overuse.

Huilin Gao at Texas A&M University and her colleagues modelled the effect of climate change on evaporation at US reservoirs. They looked at more than 670 reservoirs, representing almost 90 per cent of total US water storage.

Evaporation is driven …

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