Before You Can Say, “Let there be light,” you first have to say, “Let there be concrete and steel.” At least that is the way the process works with some of the scientific research at the Brookhaven National Laboratory in Upton, N.Y., where $150 million of stimulus funding is speeding up parts of a big new research laboratory. Upton, N.Y. Photo: Brookhaven National Laboratory Ring-shaped Lab in Upton, N.Y., used stimulus money to speed contractors held back by annual funding cycles, and parts, but not all, of the project have been moved up for earlier completion. Photo: Brookhaven National Laboratory
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.