Federal agency procurement officers are breathing a bit easier after a mad dash to obligate their remaining American Recovery and Reinvestment Act dollars by Sept. 30, the deadline for committing many stimulus-act construction dollars. Agencies have seen bids on ARRA-funded projects come in well below initial estimates, opening opportunities to redirect those savings to thousands of additional projects. A White House report, released on Oct. 1, says eight agencies were able to fund more than 3,000 additional projects beyond their original projections. Those agencies include the Depts. of Defense, Interior, Labor, Transportation, Veterans Affairs, the Environmental Protection Agency and 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.