These dredgers use hydraulic means both for excavating and transporting material. These dredgers use mechanical means for the excavation of material and are generally speaking similar to equipment used for dry land excavation. All of these will influence the achievable production rates. Other factors to be considered are weather and sea state, shipping traffic at ports and in navigational channels, the depth and thickness of material being removed and seasonal/environmental windows. One key factor is the production rate of the dredger as rates vary widely depending on the circumstances, the material to be dredged and the transport and disposal methods employed. The selection of equipment is a crucial cost element in estimating the budget for a maritime infrastructure project. equipment that is self-propelled during the excavation phase or the transportation phase or both, and.Within these four categories, equipment can be further subdivided based on the means of propulsion: Mechanical/hydraulic dredgers (utilising both basic elements in some combination) – cutter suction dredgers.The four broad classifications used here are based on the method of excavation and operation: The above-mentioned dredgers can be categorised in several ways. environmental requirements and limitations.the availability of equipment or cost of mobilisation to deploy to a given area of the world,.the placement, relocation and reuse alternatives,.the quantities and types of material to be dredged,.No single type of dredger or system of employment will be suitable for all projects. When choosing equipment, contractors, clients and consultants must give careful consideration to the operation at hand.
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