The ASCE has been dispatching teams to investigate and draw engineering lessons from disasters since the Johnstown Flood of 1889, when a private impoundment dam failed and killed 2,200 people. It has earned the highest regard for its dedication to applying impartial analysis to catastrophe and improving the standards of engineering practice through its findings. ASCE's current roll out of seven sequential teams to gather data and parse lessons from Japan's powerful March 11 earthquake and the subsequent devastating tsunami is the latest example. The information to be gleaned from the wreckage of bent steel and shattered concrete is of
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.