In New Orleans, where the U.S. Army Corps of Engineers is spending billions of dollars constructing, elevating and bolstering flood defenses, establishing hardy, fast-growing ground cover to protect levees from erosion and overwash damage is a critical part of the process. “The name of the game is getting grass established quickly,” says Jeff Beasley, turf-grass physiologist with the Louisiana State University Agricultural Center in Baton Rouge. On May 20, the center partnered with the Corps and Jesco Environmental & Geotechnical Services Inc., Jennings, La., to conduct the first, “possibly annual” course in levee re-vegetation and erosion-control techniques. Photo: Angelle Bergeron
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.