under pressure rises above the aquifer level. A __________ is located where the pressure surface is above the aquifer, but below the ground. nonflowing artesian well. If a well is drilled into an aquifer where the pressure surface is both above the aquifer and the ground, a __________ is formed. flowing artesian well.
Longest Single Span: 1,200 feet. Engineer(s): Figg & Muller Engineering Group. Completed in 1987, the Sunshine Skyway is the world's longest cable-stayed concrete bridge. It is probably the best known of the several dozen cable-stayed bridges that have been built in the United States since the late 1970s.
The design and construction of the World Trade Center, most centrally its twin towers, involved many other innovative techniques, such as the slurry wall for digging the foundation, and wind tunnel experiments. Construction of the World Trade Center's North Tower began in August 1968, and the South Tower in 1969. Extensive use of prefabricated components helped to speed up the construction process. The first tenants moved into the North Tower in December 1970 and into the South Tower in January 1972. Four other low-level buildings were constructed as part of the World Trade Center in the 1970s, and a seventh building was constructed in the mid-1980s.