Colombian crews have closed two-thirds of a large levee-canal breach that opened on Nov. 30 and spilled millions of gallons of Magdalena River water across vast sections of the country’s coastal plain. The disastrous flooding, worsened by persistent rainfall, has killed several hundred people, left millions homeless and resulted in billions of dollars in property damage to the South American nation. Photo: Vali Cooper International, LLC/BAR The site of Colombian towns flooded to the rafters recalls visions of Hurricane Katrina and New Orleans in 2005 and, at least in the case of the Dique Canal breach, the silent risk levees
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.