In explaining his decision to sell his company, Tishman Construction, to AECOM Technology Corp., Daniel R. Tishman notes that the company lacked the very deep financial resources needed to establish new overseas offices and maintain itself as a major market player. “It’s a very expensive proposition to open an office in the Middle East,” he said onJuly 19 in New York City. Photo: Luke Abaffy for ENR Daniel Tishman moves engineer AECOM further into construction services. And with those words, the respected leader of one of construction’s most famous family-owned companies summed up why AECOM and its competitor, URS Corp.,
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.