When the U.S. Army Corps of Engineers dredges sediment from the bottom of the Savannah river to maintain the depth of the shipping channel, where does all that material go? It's called a dredge material containment area (DCMA), commonly known as a dredge disposal area. The Corps' Savannah District maintains seven active DMCAs along the South Carolina side of the Savannah river, where dredged material is safely placed and managed.