After a year’s delay, the Florida Dept. of Transportation and a concessionaire have closed on a $900-million public-private partnership that will create a pair of 3,900-ft-long, 41-ft-dia tunnels connecting to the Port of Miami. Last month, FDOT, Miami-Dade County and the city of Miami finalized an agreement in which the concessionaire, called Miami Access Tunnel, will design, build, finance, operate and maintain the project, using its own equity to fund half. Bouygues Civil Works Florida Inc. will lead the $607-million construction portion of the job, with engineering assistance from Jacobs Engineering Group Inc., Pasadena, Calif. FDOT will repay the concessionaire
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.