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How do we dredge? With specialised dredging equipment that varies widely, coming in many sizes and types, and including mainly water-based and sometimes land-based machines. Dredging equipment, classified according to the methods of excavation and operation, can be grouped into the following main categories: mechanical dredgers; hydraulic dredgers; special, low-impact dredgers; and other types of dredgers. Within the above categories, further subgroups can be identified based on propulsion, i.e. self-propelled versus stationary. The selection of dredging equipment for a particular project will depend upon a combination of factors, including: the type of physical environment; the nature, quantity and level of contamination of the material to be dredged; the method of placement; and the distance to the placement site. Increasingly strict environmental regulations have led to significant developments in dredging equipment. These include automatic control, positioning systems and degassing systems. These innovations aim to reduce potentially adverse environmental impacts. How do we dredge? Types of dredgers.