Total construction starts through the first 10 months of this year are down 3% from the same period in 2009, according to McGraw-Hill Construction. A 12% decline in the nonresidential building markets and a 2% decline in heavy and highway work offset a modest 8% increase in homebuilding. The heavy and highway markets received a big boost in October with the start of five wind-power projects located in five different states and totaling $1.57 billion. The non-residential building market faced a setback in October when office-building starts declined 47% from the previous month, while the manufacturing plant category declined 60%
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.