In roughly a year on the market, federally subsidized Build America Bonds for public-works projects have soared to $90 billion in volume and saved localities more than $12 billion in interest costs, the Treasury Dept. says. In a report released April 2, Treasury says that the Build America Bonds (BABs), created under last year's American Recovery and Reinvestment Act, have increased in volume to $90 billion as of March 31. That equals more than 20% of the market for new municipal bonds. Critics have charged that investment firms' underwriting fees for issuing the new bonds have been too high. Treasury
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.