At conferences and on Websites, at research centers and out on windswept coasts around the world, increasing numbers of engineers, scientists, planners and policymakers are gathering to share ideas and lessons learned about a growing threat to one of the linchpins of civilization: the delta regions of the world. Those fragile landforms, built patiently over millennia by the sediment deposited at the mouths of the world’s mightiest rivers, are home to great ports and commercial centers of the global economy. They are, by definition, low and coastal; they also are on the front line to suffer hard consequences from climate
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.