In the latest chapter in the ongoing tri-state battle over use of the Apalachicola- Chattahoochee-Flint River basin, the U.S. Supreme Court on Jan. 12 rejected a petition by Georgia and declined to review a ruling by the U.S. Court of Appeals for the District of Columbia relating to allocation of Lake Lanier. Negotiations between Florida, Georgia and Alabama over the use of the basin date back to the 1970s and have led to tristate litigation and intervention by the Secretary of the Interior. In February 2008, the federal appeals court struck down a 2003 agreement between the U.S. Army Corps
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.