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Upgrading critical gravity sewer infrastructure in Young to increase network capacity and support future wastewater flows.

Hilltops Council

Young, New South Wales

832m DN450 Sewer Pipeline Installation

[Project Background]

Increasing Sewer Capacity for Future Growth

The town of Young is serviced by a conventional gravity sewer reticulation network that transfers wastewater to the Young Wastewater Treatment Plant. Sections of the existing sewer trunk main servicing the local industrial precinct required upgrading to accommodate projected increases in wastewater flows.

Hilltops Council initiated the replacement of the aging pipeline with a larger diameter sewer main to improve network capacity and long-term system reliability along the Boorowa Street corridor.

[Scope Of Works]

Operating in Sensitive and Live environments

Replacement of ageing gravity sewer infrastructure to accommodate projected wastewater demand in Young.

Installation of DN450 gravity sewer pipelines via open cut and microtunnelling methods

Construction of 14 new DN1200 precast maintenance holes

Reconnection of 26 existing property service connections

Testing, commissioning, and integration with the existing sewer network

Project Technical Snapshot

Construction of a new gravity sewer main combining open-cut installation and trenchless micro-tunnelling methods.

832m DN450 Sewer Pipeline

Installation Methods

590m Open Cut (Polypropylene Pipe) 242m Micro-Tunnelled (GRP Pipe)

Manholes Constructed

14 × DN1200 Precast Manholes

[Outcome / Key Features]

Delivered Increased Sewer Network Capacity

Outcome

Installation of 832 metres of DN450 gravity sewer pipeline
Combination of open-cut trenching and micro-tunnelling construction methods
Construction of 14 DN1200 precast manholes along the new sewer alignment
26 property service connections transferred from the existing sewer to the new pipeline
Testing, commissioning, and integration with the existing Young wastewater network

Key Features

Value engineering approach implemented following detailed site investigation and design
Trenchless installation used to underbore major intersections and minimise disruption to traffic and businesses
Night-shift construction undertaken near commercial areas to reduce community impact
Groundwater management implemented to address elevated water levels during heavy rainfall events
Controlled dewatering operations carried out in compliance with environmental protocols
Service transfers delivered with no disruption to residents or surrounding businesses

[Environmental Responsibility]

Managing groundwater and environmental impacts during construction

During construction, periods of heavy rainfall resulted in elevated groundwater levels across the site. Killard implemented strict environmental controls and managed all dewatering operations safely, ensuring surrounding areas and waterways were protected while construction continued without incident.

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Hilltops Council – Young Sewer Main Replacement

832m DN450 Sewer Pipeline Installation

Increasing Sewer Capacity for Future Growth