An engineer on the ground in Christchurch says that New Zealand�s seismic retrofit code and/or construction methods should be strengthened based on the damage to recently upgraded buildings. Photo: AP Photo/Kyodo News, Shuzo Shikano Rescuers stand atop a collapsed structure in Christchurch. Related Links: Engineers Surprised By Damage to Newer Structures The New Zealand Building Code Eyewitness Account of New Zealand Earthquake Many other Christchurch buildings, damaged in many cases as a result of soil liquefaction, were rendered uninhabitable and also still pose a public threat because they might collapse, says the engineer, Amir Gilani. Several recently seismically retrofitted buildings
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.