Tom Coble, president of Coble Trench Safety, a Greensboro, N.C.-based firm that supplied trench and traffic safety equipment and training to contractors, municipalities and industrial clients in southeastern and mid-Atlantic states, was killed on Jan. 20 when the plane he was piloting crashed shortly after takeoff in Rainbow City, Ala.Coble, who was 58, founded the now 82-employee firm in 2002. It now has 11 locations. CobleA spokesman for the firm says the cause of the crash “has not been determined yet” and is under investigation. The company says Coble, who was alone and returning to North Carolina, had more than 42
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.