A Belgium contractor has snagged the second of two massive dredging contracts to deepen and widen the entrances of the Panama Canal, an integral element of the waterway’s $5.2-billion expansion project. The Jan De Nul Group, Hofstade/Aalst, submitted the winning bid of $89.6 million to dredge the canal’s Atlantic entrance to 15.5 meters below mean water level to allow large ships access to the canal, and $16.4 million for a contract option to dredge an additional 2.3 million cu meters. The company is part of the Grupo Unidos por el Canal consortium that earlier this year won the $3.48-billion contract
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.