Dredging consists of the extraction of submerged soils for alluvial materials. This operation can take place in rivers, tributaries, channels, lakes, sea or by the sea.
To carry out the dredging of materials, different means of extraction are possible.
If the extraction is carried out by the sea or a riverside, a dragline is used to extract the materials from the water. On the other hand, on deep submerged sites, the extraction is carried out by dredging.