With 25 months left to bring New Orleans’ Hurricane and Storm Damage Risk Reduction System to 100-year protection levels by a promised June 1, 2011, deadline, the U.S. Army Corps of Engineers has awarded 180 contracts worth $2.5 billion of the roughly 350 contracts required for the $14.3-billion program. Photo: U.S. Army Corps of Engineers Thousands of feet are under construction, but contracts for 21 miles wait in the wings. The Corps says it is on track, but industry representatives fear the work window is closing fast and if remaining awards aren’t made soon, it will be impossible for contractors
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.