Sinkhole
A hole or void in the upland area of a soil retaining structure that is formed due to the loss of fill. (New York City Economic Development Corporation, Waterfront Facilities Maintenance Management System, May 2016)
A hole or void in the upland area of a soil retaining structure that is formed due to the loss of fill. (New York City Economic Development Corporation, Waterfront Facilities Maintenance Management System, May 2016)