On 12 March 2010 the Australian minister for Roads & Ports presented the project with the prestigious National Infrastructure Award. And what’s more: on time and within the set budget. Thanks to the extensive environmental monitoring program and our strict adherence to the environmental requirements, the project was realized in compliance with the Environmental Management Plan (consistent with ISO 14001).

The remaining loose material was regularly suctioned off to prevent the strong currents from carrying it to the nearby nature area.

Thanks to laboratory testing using scale models we achieved high suction efficiency and were able to reduce spillage of dredged materials and so minimize the environmental impact.

This allowed us to combine the maneuverability of a hopper with the strength of a cutter

A unique ‘ripper’ draghead was developed for use with a trailing suction hopper dredger in order to dredge the entrance to the bay and remove around 460,000 m3 of limestone.

A special frame was developed for the protection of existing, operational pipelines by positioning steel plates over them with great precision and within the stated tolerances.This was enclosed by a bund of clay 5 meters high and 40 meters wide, and eventually capped with a layer of clean sand Dredging is a routine necessity to keep Redwood. A trailing suction hopper dredger was deployed to pump 1.4 million m³ of contaminated silt through a 750m-long pipeline and a diffuser to an underwater disposal area. Dredging is the removal of sediments and debris from the Ports waterways and the San Francisco Bay Channel.

What is dredging of a channel