Rear Adm. Greg Shear, retiring chief of the Naval Facilities Engineering Command, likely had a few sleepless nights in 2006 when he first took over the U.S. Navy’s construction and facilities management arm, worrying about how it would handle a then-record $9-billion building mission. But at least that would be the peak, he told Navy brass. Three years later, the NAVFAC program has grown nearly 80% to $16 billion and is reaching around the world. “So, I’m not a good prognosticator,” he says. Changing military missions, new political priorities, global disasters and other contingencies have combined to test NAVFAC’s ability
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.