TransCanada Corp., based in Calgary, Alberta, received permission on March 11 from Canada’s Energy Board to build the 327-mile Canadian portion of the Keystone XL expansion pipeline, which will be the first pipeline to take Canadian crude oil to the U.S. Gulf Coast. The 36-inch pipeline will be 1,980 miles long, beginning in Hardisty, Alberta, and going through Saskatchewan, Montana, South Dakota, Nebraska, Kansas, Oklahoma and finally into Texas. The $1.66-billion pipeline will carry the equivalent of 1.1 million barrels per day. Applications for U.S. regulatory approvals are proceeding, and decisions are expected late this year. TransCanada says construction is
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.