the concentration of the sand and water mixture.The distances that the rainbowing method can reach depends on: It is used to start the process of building an island in open water and once the island is in place, filling can be continued using pipelines. The technique is often used for beach replenishment where a beach is being shored up to prevent erosion for coastal protection or recreation (or both) to a reclamation site where new land or islands are being built for port expansion, recreation or multiple other purposes. Rainbowing is employed when water depths are limited and a trailing suction hopper dredger can get in rather close to the designated site. Rainbowing by trailing suction hopper dredgers During rainbowing, a trailing suction hopper dredger pumps the sand that has been claimed from the seabed and transported in its hopper in a high arc placing it at the reclamation site.
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