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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…

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"—Finley, 1917

Shaft lining

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"—Finley,…

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"—Finley, 1917

Shaft lining

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"—Finley,…