CCTV and Laser Profiling in Wellington | TDG Environmental

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CCTV and Laser Profiling in Wellington

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TDG was tasked by the client to conduct comprehensive data collection within the project’s catchment area to evaluate network conditions and renewal needs. This involved employing various techniques, including CCTV inspections, laser profiling, and GPS surveying.

This scope encompassed:

  • CCTV inspections of 1608m of sewer pipelines, including light flushing.
  • Snap-on laser pipe profiling covering 356m.
  • Track & trace of 602m of unlocated pipelines and manholes using camera and Radio Sonde.
  • GPS surveying of 70 manholes and 24 lamp holes, including inspections.
  • Soil clearance up to 300mm deep and scrubbing to uncover 19 buried manholes and lamp holes.
  • Heavy cleaning of 331m of semi-blocked pipelines affected by heavy fats.
  • Assessment of the suitability of lining and other renewal methods for each pipe within the project scope.


  • Manholes situated in dense vegetation required innovative solutions for access.
  • Overgrown vegetation hindered vehicle access for pipeline cleaning.
  • Rootbound manholes needed cleaning to enhance CCTV inspection capabilities.
  • High infiltration into the system was exacerbated during wet weather events.

The outcome

The outcome Essential data gathered facilitated comprehensive design collaboration with Mott MacDonald, streamlining the construction and renewal method selection process and minimizing alterations during execution. Early engagement and input from TDG and Mott MacDonald in the design phase ensured the feasibility of proposed designs, providing cost-effective solutions and maximizing investment value.


Sewer & Water Authorities



Project Highlights

  • Comprehensive and Seamless Offerings: TDG’s integrated service offerings and efficient transition to the design phase met client requirements with expertise and efficiency.
  • Enhanced Pipeline Mapping: Uncovering buried manholes and updating GIS data accurately enabled precise calculation of liner length requirements, demonstrating attention to detail and technological proficiency.
  • Client Satisfaction: The client expressed utmost satisfaction with the project outcome, highlighting TDG’s ability to exceed expectations on a challenging assignment.

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