In the unstable economy, many design firms are receiving mixed messages from the marketplace as sectors such as telecommunications appear poised for a rebound while the manufacturing sector offers little hope on the horizon. After nearly three years in the doldrums, firms in the telecommunications market are eyeing a possible uptick as wireless companies look to speed up their networks and gain an edge on their competition. Following a series of consolidations that cooled off the wireless market, companies are moving forward with plans to add new cell towers and update existing sites with more bandwidth. Photo: Procter and Gamble
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.