Industry News

CGC Dredging Uses Trimble for an Accurate Hydrographic Survey

Port Geographe, located in Western Australia is a canal community and small boat harbor that requires regular dredging in order to cut back seagrass wrack and accumulated sedimentation collected on the seafloor. Dredging work establishes appropriate depths and keep the channel open to navigation. In addition, the port’s seawall structure had to be redesigned because it collected unmanageable levels of seaweed and sand. CGC Dredging was tasked with dredging the footprint to desired depths to prepare the seafloor for placement of rock for the new seawall. With a tight deadline and specification to meet these goals, CGC turned to its technology partner SITECH Western Australia (WA) and Trimble for assistance.

The CGC team adopted the Trimble® HYDROpro™ Construction software, Trimble SPS461 GPS heading and positioning receivers; WA Limestone (WAL) used Trimble GCS900 Machine Control on their excavators and a SPS855 receiver with HYDROpro Navigation on a Trimble Site Tablet and a single beam echo sounder on their hydrographic boat.


• For the hydrographic survey, WAL avoided a multi-beam scanning operation that was well over budget.

• For CGC precise cutter head guidance allowed the dredge operator to dredge to the desired depth and return to the exact location where the previous day’s work ended; this avoided wasted time and costly rework

• HYDROpro software displayed the precise position of the cutter head under water within an accuracy of 10 centimeters

• Met depth guidance parameters and rigorous design measurements

For more information, see the June issue of ECO Magazine, coming soon!

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