Sen. David Vitter (R-La.) has imposed a hold on the nomination of Lt. Gen. thomas Bostick, President Obama's choice to be the next Army corps of engineers chief. Vitter is withholding approval until the Corps provides satisfactory answers to the senator's questions about several Louisiana issues, including project funding.Senate holds block floor action on nominees. Furthermore, Bostick must gain approval from the Armed Services Committee, which has yet to convene a hearing on his nomination.Maj. Gen. Merdith W.B. “Bo” Temple, the Corps deputy commanding general, became the acting chief of engineers on June 17, following the retirement of Lt. Gen.
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.