Project Start Date

December 2016

Project Completion Date

September 2017


Hunter Water Corporation

Comdain's Role

Principal Contractor


New South Wales


Distribution Infrastructure

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Design and installation of two trenchless crossings of the Hunter River and installation of two Flow Control Valves.

Works Undertaken

  • Detail design of two 1500mm diameter trenchless crossings with bore diameter of 1500mm
  • Construction of two 400m long trenchless crossings under the Hunter River and installation of two 1200mm outside diameter HDPE carrier mains
  • Construction of two Flow Control Valves including the associated MSCL pipework, valving, electrical, telemetry and power supply
  • Construction of connecting MSCL pipework and tie-in to existing Newcastle potable water supply pipeline

Highlights & Innovations

  • Horizontal Directional Drilling through varying geotechnical conditions.
  • Successful tie-in of newly constructed pipelines to existing infrastructure either side of the river within strict 12 hour shutdowns.
  • Safely working around existing infrastructure including a major Sydney to Brisbane optic fibre cable and high voltage overhead power transmission cables.
  • Alignment of the 320m, DN1200 welded pipe string that didn’t impact local residents, prior to being pulled through under the river.
  • Working in close proximity to a family residence on the northern side of the river.