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Dredging, the excavating or scooping out of soil, mud, sand or rock under water by a machine called a dredge. Dredging is used in deepening and widening the beds of rivers, canals, harbors. The forms of modern dredges are very numerous, different conditions requiring different forms.

Dredge

Dredging, the excavating or scooping out of soil, mud, sand or rock under water by a machine called…

"A machine used for clearing out or deepening the channels of rivers or harbors. Dredging-machines are variously constructed, the simplest being like the oyster-dredge described above, only having a perforated cowhide bag instead of the chain-net, and a stronger 'spoon' or iron mouth to the bag." — Chambers' Encyclopedia, 1875

Dredge Machine

"A machine used for clearing out or deepening the channels of rivers or harbors. Dredging-machines are…

Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location.

Excavating Purpose Dredger

Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow…

"Longitudinal section of hopper dredger, employed on the River Clyde. The vessel steams to place of working and is moored by the Steam Winches A A at bow and stern to buoys, the Bucket Ladder B is then lowered by steam power, and thereafter Buckets set in motion by gearing C C. The depth of water at which the Bucket Ladder dredges is regulated by the Hoisting Shears and Chain Barrel D D, driven by shafting E E from the Engines. The Buckets discharge the material by the shoot F into the Hopper G. The dredged material is discharged by the doors of the Hopper being opened by the Lifting Chains H H. These doors are hinged on to the side of Vessel, and suspended at centre by the Lifting Chains, which are connected to geared Crab Winches I I." -Hill, 1921

Hopper Dredger

"Longitudinal section of hopper dredger, employed on the River Clyde. The vessel steams to place of…

A ship used for lifting mud and silt from the bottom of rivers, harbors, and canals.

Dredging Ship

A ship used for lifting mud and silt from the bottom of rivers, harbors, and canals.