The U.S. Army Corps of Engineers is banking on a fabric coating, better fill and changes in scour aprons and anchor tubes to make a 5.7-mile-long installation of berm with a sand-filled, geotextile-tube core the most resilient and long-lived geotube beach-hardening project it has built to date. + Image Image: US Army Corps of Engineers Hardcore sand dune Photo: Angelle Bergeron/ENR Gulf-side anchor tube and apron will drop like a protective curtain if land is cut away. Related Links: Tubin' on the Isle Weeks Marine Inc., Cranford, N.J., is 20% complete on a $25.7-million contract to restore the beach 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.