These dredgers are often employed on construction and maintenance projects. Mechanical/hydraulic dredgers are the reliable workhorses of the dredging industry. In some special cases, hydraulic dredgers pump into barges for subsequent transport to the placement site. They use hydraulic centrifugal pumps to provide the excavating force without mechanical cutters and hydraulic transport to carry solid/water slurries from the digging site through a pipeline to the surface and then to the discharge site. 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.
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