As New Orleans' complex $14.6-billion storm-surge risk reduction system—which was federally funded, designed and constructed—races toward substantial completion, local stakeholders now are asking if the federal government will help them maintain it. Photo: Courtesy Of USACE New Complex drives largest interior drainage pump house in the world. The facility is new to the system, as is the O&M bill. Photo: Courtesy Of USACE Complex sector gates on federal waterways are built under emergency provisions that will leave locals footing the O&M bill. Related Links: New Orleans Flood Defenses Detailed With Operations and Maintenance In Mind The U.S. Army Corps of
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.