Midsize design firms with revenue between $100 million and $250 million are often thought of as being the industry's most endangered species as well as its prime buyout targets. But Walnut Creek, Calif.-based water-wastewater firm Carollo Engineers Inc. thinks it will do just fine. Photo: Courtesy Carollo Related Links: The Top 500 Design Firms: 2010-2011 at a Glance “We've stayed true to the goal of internal ownership, and we're not tempted by big-dollar numbers,” says Gary Deis, CEO since 2002. Carollo has $168.5 million in 2010 revenue and 650 employees. After market conditions forced the firm to re-examine its valuation,
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.