Assessment of Stormwater Conduits in NSW | TDG Environmental

case study

Assessment of Stormwater Conduits in NSW

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Assessment and rectification of 4.5 kilometers of Stormwater conduit and maintenance holes, utilising CCTV inspections or physical traversing methods, followed by necessary rectification works. Services Provided included:

  • CCTV operations using Tractor & pushrod
  • Root cutting, draining, and jetting operations.
  • Vacuum loading operations.
  • High-pressure water jetting (HPWJ) operations.
  • Deep man entry confined space entry protocols, utilising B.A trailer & self-rescuers.
  • Intensive manual handling and labor.


  • The assets in the upstream portions of the Area 30 catchment were constructed between 1850 and 1880, with some lower sections added in 1928 to 1931. Further amplifications occurred in 1975, and major renewal and amplification efforts took place between 1985 and 1987 as part of the Darling Harbour/Entertainment Centre precinct redevelopment. Additionally, one conduit branch north of DC30O was inspected but not documented in HYDRA or WAE.
  • Traffic control and night works were managed by 5-man TC crews and R.O. Ls, operating from 7 pm to early morning shifts.
  • High levels of customer relations and constant communication were maintained in residential areas, while coordination and planning were crucial for managing weather and tides.

The outcome

Our stormwater maintenance services ensure continuous functionality, benefiting communities by preventing flooding and maintaining clean waterways. Through effective coordination and a range of services, our teams achieved successful project completion.





Project Highlights

  • Comprehensive Assessment and Maintenance: Successfully surveyed and maintained 4.5 kilometers of stormwater conduit and maintenance holes, ensuring optimal functionality through meticulous inspection and rectification.
  • Versatile Solutions: Employed a diverse range of services, including CCTV inspections, root cutting, jetting, and vacuum loading, to address various challenges and maintain system integrity effectively.
  • Effective Management of Historic Assets: Overcame challenges posed by historical infrastructure dating back to the 19th century, implementing rigorous safety protocols and efficient manual handling techniques to impress the client with successful project completion.

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