Photo by Nadine Post for ENR A common purpose is a great motivator. The hundreds of people cooperating and coping at Ground Zero, many of whom are otherwise fierce competitors, have many reasons for putting up with the added hassles, restrictions and sacrifices. Related Links: Key Links Help Reshape Manhattan Below Grade at WTC Hub, a Transit Tango At New York's New World Trade Center, Uncommon Cooperation 9/11 Memorial Is Centerpiece of World Trade Center Redevelopment In the giant “ant colony” under the $18-billion World Trade Center rebuild in Lower Manhattan, there are seven major concurrent projects (eight, if the
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.