In April, floods and mudslides killed 249 people in Rio de Janeiro and the outlying metropolitan area, according to fire department officials. Even in a country accustomed to heavy rainfall, flash floods and mudslides, the loss of life was unprecendented, according to Brazilian reports. Photo: O Empreiteiro Slides claimed lives and property in areas where officials ignored illegal construction for years. Niterói city had the highest toll: 164 dead, many of whom were killede in slides. Forty-eight bodies have been recovered. In Niterói's Morro do Bumba district, houses were built illegally on top of a garbage dump that was supposed
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.