The New Zealand earthquake surprised engineers by triggering severe damage or collapse of some recently constructed buildings. Photo: AP Photo/Kyodo News, Shuzo Shikano Rescue workers search for victims buried under the rubble near the Canterbury Television building in Christchurch, New Zealand, Wednesday night, Feb. 23, 2011. The magnitude 6.3 earthquake that struck 10 km from Christchurch, South Island, New Zealand on Feb. 22 brought down or severely damaged some contemporary structures because the quake was extremely shallow—centered only 5 km below the surface. “New Zealand has very good loading standards and a strict regulatory environment and since the mid-70s onwards,
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.