The dredged material can vary greatly (peat and organic soils, cobbles, clays, boulders, silts, broken rock, sands, rock and gravels, cemented soils and corals), and dredging depth can vary from a few meters to more than a hundred meters. Maintaining irrigation canals and reservoirs – conserve the usage of scarce water supplies. (CIWEM 2014) 'Dredging is not a universal solution to flooding.Flood control – improve or manage the flow of the tidal movement in rivers, channels, or natural waterways.Protect the beach – providing fill materials in the form of sand and rocks to replenish the beach.Environmental dredging – to prevent contamination and improve water quality to restore the affected marine area.Excavation to remove overlying soil – to reach minerals, gems, precious metals, and fertilizers lying in the sea, river, or lake.Excavation at underwater foundations – prior to placement of pipelines or tunnels for underwater infrastructure.Land reclamation for residential and industrial areas, habitats for birds or wildlife.Dredging is also conducted for construction purposes, for mining, and for environmental cleanup and enhancement.
Maintenance / increasing navigation channels – to ensure the safe passage of boats and ships Dredging is the term given to removal by digging, gathering, or pulling out materials from the bed to deepen waterways and to create harbors, channels, and berths.There are four phases in the dredging process: excavation, vertical transport, horizontal transport, and placement or use of the dredged material. Dredging is the process of underwater excavation of soils and rocks.ĭredging is done periodically to remove underwater sediments called silt and debris from shipping harbors, rivers, coastlines, or lakes.
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