Since subsurface utility maps are so essential to reducing risk on many construction jobs, research continues to improve buried-utility detection and mapping tools. Image courtesy of Underground Imaging Technologies Combined sensors help map buried features in difficult soil conditions Several concepts were showcased at a conference produced by FIATECH, an industry consortium working to improve project delivery through technology, in Phoenix in late April. One presenter, James Anspach, chairman of the American Society of Civil Engineers' codes and standards committee, noted that the U.S. has trillions of dollars invested in some 20 million miles of known, buried utilities. “Existing utilities
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.