Dams

Dams, Rivers & People News Bulletin 07 Dec. 2015 (Dams sap Earth’s water, release arsenic in groundwater & fuel Climate Change)

Two new studies show that dam not only significantly increase evapo-transpiration but also worsen arsenic problem in groundwater. In the first study done by Stockholm University in Sweden researchers found that dams and irrigation significantly increase evapotranspiration, an effect that increases the loss of freshwater to the atmosphere, thereby reducing the water available for humans, societies and ecosystems on land. The researchers have compiled and analyzed data from 1901 to 2008 for climate, hydrology and water use in one hundred large hydrological basins spread over the world. In the second study done by Stanford University in Cambodia, researchers concluded that hydrological development particularly dams are responsible for release of increased and unnatural amount of arsenic in Cambodia’s groundwater.

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