America’s aging infrastructure—which, in 2009, the American Society of Civil Engineers estimated would require $2.2 trillion over a five-year period—continues to provide work for environmental contractors through American Recovery and Reinvestment funding. Photo:Courtesey of PCL Utilities are still retrofitting aging facilities, like the South Bay Wastewater Treatment Plant. Related Links: General Building: Firms Find Little Respite From Weak Economy Manufacturing/Telecommunications: Tough Market Requires Top-Notch Players Petroleum: Projects Cancelled in Uncertain Climate Power: Federal Policy Drives New Power Projects Transportation: Dearth of Funds Keeps Sector in Doldrums The Top 400 Contractors List Specifically, contractors are finding work in assuring the safety
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.