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Delivering a critical trunk water connection linking the Prospect South and Macarthur distribution systems to support Western Sydney’s future growth.

Sydney Water

Cecil Park – Kemps Creek, New South Wales

4.5km Steel Trunk Water Main (DN600–DN1250)

[Project Background]

Connecting Major Sydney Water Distribution Systems

Sydney Water initiated the Prospect–Macarthur (ProMac) trunk water program to link the Prospect South Water Distribution System with the Macarthur system, enabling the transfer of up to 120 ML/day of drinking water between the networks.

This strategic connection strengthens supply resilience while supporting rapid population growth across the South West Growth Area, Western Sydney Aerotropolis, Liverpool CBD, and Menangle Park. The infrastructure forms a critical backbone for future potable water supply across Western Sydney.

[Scope Of Works]

Operating in Sensitive and Live environments

Delivery of large-diameter trunk water pipelines supporting long-term water supply across Western Sydney growth areas.

Installation of 4.5km DN600–DN1250 steel water pipelines

In-situ welding and installation of Sintakote and Sintalock pipe systems

Construction of creek crossings, valve infrastructure, and cathodic protection systems

Connection and commissioning of new trunk mains within the live Sydney Water network

Project Technical Snapshot

Construction of a high-capacity trunk water pipeline forming part of Sydney Water’s strategic network expansion.

4.5km Steel Trunk Water Main

Pipe Diameter

DN600 – DN1250

Installation Depth

Up to 6m (creek crossings)

[Outcome / Key Features]

Principal Contractor Delivery of Major Trunk Infrastructure

Outcome

Self-performed installation of 4.5km steel trunk water pipeline across multiple diameters (DN600–DN1250)
SINTAKOTE and SINTALOCK coated pipelines welded in situ
Installation of Pressure Reducing Valve (PRV), flowmeter and associated electrical connections
Cathodic protection system installed to ensure long-term asset integrity
Pipeline crossings delivered beneath two creek corridors up to 6 metres deep

Key Features

Delivered as Principal Contractor with full self-perform capability
Pipeline installation through residential areas and critical RMS road crossings
Complex stakeholder coordination with Liverpool City Council, RMS, Jemena, Sydney Metro and local institutions
Community-sensitive construction including school zone management and restricted working hours
Access coordination across private properties to maintain pipeline alignment
Spoil management and controlled excavation across the full corridor

[Environmental Responsibility]

Environmental controls across sensitive corridor crossings

Environmental management measures were implemented throughout construction, including controlled works within sensitive creek corridors and mitigation strategies for areas affected by Phytophthora pathogen contamination. These controls ensured the trunk infrastructure was delivered while protecting surrounding ecosystems and maintaining environmental compliance.

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Sydney Water ProMac Trunk Main

4.5km Steel Trunk Water Main (DN600–DN1250)

Connecting Major Sydney Water Distribution Systems