Civil Construction & Road Maintenance
Following severe storm events in 2021 that overwhelmed local drainage infrastructure, Dowsing Group was engaged by the City of Cockburn to undertake essential drainage upgrades across three locations in the suburb of Spearwood—Marvell Avenue, Stevenson Way, and Bishop Park.

The aim of the project was to significantly improve the capacity and resilience of the stormwater system to handle future high-intensity rain events.

Client

City of Cockburn

Sector

Government

Location

Spearwood, WA

Duration

Jan 2025 - Jul 2025

Type

Construct Only

The project involved the construction of a new 460m stormwater drainage pipeline and the installation of underground stormwater detention systems.

Specific work activities included:

  • Installation of reinforced concrete and HDPE drainage pipes and structures.
  • Construction of underground stormwater retention systems (StormTrap) at Stevenson Way and Bishop Park. Pre-cast storm cells craned into position.
  • Relining of existing drainage within easement areas.
  • Pavement construction and reinstatement over trench lines.
  • Removal and reinstatement of kerbs, footpaths, crossovers, street signage, and verge treatments.
  • Reinstatement of turf, garden beds, and irrigation systems.
  • Spotting and reinstatement of road line marking.
  • Submission of comprehensive ‘as constructed’ documentation in accordance with ASPEC standards

Building on a track record of delivering drainage services for the City of Cockburn, Dowsing continued its role in executing major civil infrastructure upgrades designed to enhance the stormwater capacity and flood resilience across the Spearwood catchment.

  • Constrained Sites: With the project area bounded by existing trees, utilities and residential infrastructure, Dowsing implemented safe excavation methods and carefully sequenced works to manage spatial constraints while protecting sensitive assets.
  • Stakeholder Coordination: Early and ongoing collaboration with utility providers, local residents, and the City ensured integration of services and minimal disruption to the community throughout the construction program.
  • Environmental Considerations: Environmental management measures were embedded into delivery, with stringent controls on dust, sediment, and runoff implemented under an approved Construction Environmental Management Plan.

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