Rainbowing is used when the vessel can get close to the discharge location and the previously reclaimed sand body is above or almost above the surface. The vessel can discharge its load in various ways, depending on the project specifications. Dredging stops when the maximum hopper capacity is reached. Excess water flows out through so-called overflows. ![]() The mixture of sand and water is pumped into the hopper of the dredging vessel. The drag head moves slowly over the bed collecting the sand like a giant vacuum cleaner. Trailing suction hopper dredgers are equipped with one or two suction pipes ending in drag heads. ![]() ![]() Boskalis deploys trailing suction hoppers dredgers for the construction and maintenance of ports and waterways as well as land reclamation and coastal defense and riverbank protection. The trailing suction hopper dredgers (TSHDs) of Boskalis are oceangoing vessels that can collect sand and silt from the seabed and transport it over large distances.
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