The dollar value of construction starts during the first half of this year was $195 billion, or 36% less than the same period a year ago, according to McGraw-Hill Construction. The residential market continues to be a drag, showing a 46% decline from last year’s already depressed market. However, the nonresidential building market also is in a steep decline, falling 41% below 2008’s first-half total. “Non-residential building, hampered by the weak economy and tight bank lending, would see further erosion,” says Robert Murray, chief economist for MHC. “On the plus side, the boost to public works from the federal stimulus
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.