Last update: 09 February 2008

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Aboard the dredger Waterway

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Officers from Poole's Leisure Services department, who led the beach replenishment project, were invited on board the Waterway on 29th December as she dredged the Swash Channel and then pumped sand ashore.

The Waterway is a twin screw diesel driven hopper dredger with an open hopper.  A single dredge and suction pipe (0.90m dia) on her starboard side is connected by loading lines to loading boxes above the hopper.  She discharges with the aid of water jets via either four bottom doors (for dumping at sea) or a trailing pipe (for pumping ashore) at the bow.

A submerged pipeline (known as a sinkerline) approximately 750m long x 700mm diameter connects the dredger with the beach.  

With assistance from the multicat, the dredger couples to the riser pipe section via a bespoke ball-joint system.  At the seaward end the sinkerline is coupled to a 36m flexible riser pipe section, followed by a 100m flexible floating pipeline.  

Two main diesel engines drive the ship (3700 h.p. (2760 kW) each at 750 rev/min) and two transverse tunnel type electrically driven 670 h.p. (500kW) bow thrusters give good manoeuvrability.  One of the ship's engines is used to pump ashore.  Total installed power is 8535 h.p. (6365kW).

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