Officials of Tokyo Electric Power Company were flooding two nuclear reactors at its Fukushima Daiichi plant with corrosive seawater and boron and planning to pump seawater into a third in attempt to cool the reactor cores damaged after the earthquake Friday. + Image Image: NEI Photo: AP Photo/Kyodo News and Tokyo Power Electric Co. In this combination of photos, the No. 1 reactor of the Fukushima Daiichi Nuclear Power Plant, is seen before, left, and after an explosion that blew out the walls of the unit, in Okumamachi, Fukushima Prefecture in Japan. Additionally, they are venting gas from at least
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.