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A single hopper dredge is mopping up rough spots on the river bottom identified by sonar scans of the work area.

A company hopper dredge capable of taking on 4,000 cubic yards at a time will work sections of the channel deepening, then move to a point offshore of Broadkill to pump sand onto the beach before returning to the channel.

Different methods are used throughout the country, but in Rehoboth, a huge ship called a hopper dredge brings sand from an area called a borrow site in the ocean several miles away.