As Tokyo Electric Power Co. continues to battle the problems at its Fukushima Daiichi powerplant—on April 11 it reported another hydrogen explosion at Unit 1—the firm and the country are beginning to prepare for cleanup and reconstruction. At a World Economic Forum on Global Risks, Japan's Chief Cabinet Secretary Yukio Edano said that the regions hit by the March 11 earthquake and tsunami will be rebuilt as early as possible to withstand natural disaster. “We will create ecotowns that are fully equipped with district heating, utilizing plant matter and biomass from the region and cultivating features of communities that thoroughly
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.