Photo for ENR by C.J. Schexnayder Concrete terms? Contractors and canal officials differ over responsibility for quality of aggregate used for the project's concrete. Related Links: Arrival of Gates Marks Milestone in Panama Canal Expansion Panama Canal Contractor Files $573-Million Claim In an effort to avoid a threatened shutdown of work on the $5.2-billion expansion of the Panama Canal, the authority that oversees the historic waterway proposed a joint financing scheme to its construction team on Jan. 7 to cover cost overruns. But it is not clear whether a short-term deal will keep building progress on track.Officials of the Panama
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.