Dredging is simply the removal of solid material from its underwater state and transporting it somewhere else.
Dredging is performed in almost all waterways around-the-world, but most commonly in lakes, rivers, beaches, ports, harbors, canals, etc. See below.
See examples below:
Although there are many types of dredges, such as hopper dredges and clamshell dredges, Ellicott’s specialty is the hydraulic cutter suction dredge. A cutter suction dredge uses a cutterhead to break up or excavate sediment while at the same time suctioning up the material and pumping it through a discharge pipeline which is usually about 3,000 ft (1 km) in length.