Prices for diesel fuel, structural steel, lumber and gypsum-wallboard products started to stir during the first quarter, but most increases were coming off dismal lows in 2009 and were not strong enough to break the stranglehold the recession has on construction costs. Eleven of 15 major industry cost indexes tracked by ENR showed costs falling below a year ago. These drops included year-to-year declines of 5.8% for warehouse construction, 4.7% for office buildings and 1.7% for school construction, according to the U.S. Commerce Dept.’s January cost indexes. The agency also reported in January another 3.6% decline in homebuilding costs during
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.