Lake Burragorang, which is impounded by Warragamba Dam, is located about 60km west of Sydney and has a total storage volume of approximately 2 million megalitres. Representing one of the largest domestic water supply dams in the world, it is the largest of the storages operated by the Sydney Catchment Authority, supplying approximately 80% of the water delivered to Sydney.

The Sydney Catchment Authority engaged the services of HydroSurvey Australia to undertake a bathymetric survey to provide an accurate description of the lakebed, and to perform measurements of the volume of sedimentation that had occurred in the reservoir since construction. The survey work undertaken would form the basis for future comparative studies.

Conducted as a single field operation, the survey was undertaken on board the survey vessel 'Felix', using GeoSwath technology to provide 'total bottom coverage' of the lakebed to the existing water level.

An Odom dual frequency echo sounder was used to determine the depth and areas of soft sediment. The data collected was then compared to the original surface contours to determine the amount of sediment deposited since the dam was constructed.

Hardcopy and digital records of the survey were later provided to the Sydney Catchment Authority.

HydroSurvey Australia was engaged by the Adelaide City Council to cross-sectionally sound the lake, detail the shoreline and structures in the lake, and prepare sounding and contour plans. The purpose of the survey was to determine the effort required to clean out the lakebed, calculating the volumes of earth to be taken out and replaced.

Soundings were taken around existing bridge pylons and along the alignment of the new bridge at Blanchetown, South Australia. The data produced was then modelled to determine the degree of scouring around existing pylons and plot the river bed profile along the alignment of the new bridge.