With the rapid advance of work on a surge barrier on New Orleans� eastern flank, the city has substantially more protection against storm surge than it had just a year ago. Photo: Angelle Bergeron/ENR Vic Zillmer, USACE resident project manager atop the surge barrier stretching away toward its land tie-in to Chalmette levees. Photo: Angelle Bergeron/ENR New Orleans Mayor Mitch Landrieu saluted the Corps for being �on task and on time� with the project and for building levees �better than before.� Left to right behind are Col. Robert Sinkler, commander of the U.S. Army Corps of Engineers� Hurricane Protection Office
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.