The AECOM Technology Corp. acquisition juggernaut, running now for at least five years, is showing few signs of slowing down, despite the recession. The Los Angeles-based engineer said on Aug. 5 that it would spend a total of nearly $680 million to buy two more companies, less than a month after its $245-million purchase of Tishman Construction Co. propelled the firm deeper into the construction management business. AECOM announced an agreement to acquire Davis Langdon, a U.K.-based cost and project management consultant, for $324 million. The much-rumored purchase is set to add 2,800 global employees and $430 million in 2009
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.