Chinese officials are investigating why a 13-story apartment building under construction in Shanghai toppled over suddenly, almost intact, killing one worker. The building was supported by piles that were suppose to be buried deeply but which were uprooted in the riverfront construction site accident. The building, one of 11 others at the Lotus Riverside complex, had 629 units. Photo: AP / Wideworld
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.