In Brazil, many smaller dams disrupt fish more than large hydropower projects

A small hydropower dam in Brazil. Credit: Victor Baptista The development of small hydropower dams is widespread throughout Brazil and elsewhere in the world, vastly overshadowing large hydropower projects. The proliferation of these smaller dams is a response to growing energy and security needs. Their expansion, however, threatens many of the remaining free-flowing rivers and […]

Aging dams pose growing threat: UN

Cover of the UNU-INWEH report. Credit: UNU-INWEH By 2050, most people on Earth will live downstream of tens of thousands of large dams built in the 20th century, many of them already operating at or beyond their design life, according to a UN University analysis. The report, “Ageing water infrastructure: An emerging global risk,” by […]

World’s ageing big dams pose ’emerging risk’: UN

Most of the world’s nearly 59,000 big dams—constructed between 1930 and 1970—were designed to last 50 to 100 years By 2050, more than half the global population will live downstream from tens of thousands of large dams near or past their intended lifespan, according to a UN report released Friday. Most of the world’s nearly […]

Role of dams in reducing global flood exposure under climate change

A new collaborative study led by researchers at the National Institute for Environmental Studies, the University of Tokyo, and Michigan State University exposes the role of dams for mitigating flood risk under climate change. Flood is amongst the costliest natural disasters. Globally, flood risk is projected to increase in the future, driven […]