Since 2005, federal government has invested $14.6 billion to improve perimeter protections around New Orleans to reduce the risk from hurricane storm surge. Many of the new or improved elements of the 350-mile-long system include features designed to reduce the cost of operation and maintenance. Photo: Angelle Bergeron Thousands of steel batter piles bracing the IHNC surge protection barrier are sheathed in neoprene jackets to increase life and reduce maintenance. Related Links: Keeping Up Defenses Power Pump: GIWW WCC on Its Way to Completion “The Corps went to great lengths to reduce O&M costs for the local sponsor,” says Colonel
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.