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Trinity Valley Stormwater Drainage Upgrade: Stage 4

Trinity Valley Stormwater Drainage Upgrade: Stage 4

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Category: Stormwater drainage network

Project management

Managed by City of Norwood Payneham & St Peters

Design: TBA

Contractor: TBA

Trinity Valley Upgrade overview

The Trinity Valley Drainage Upgrade involves the installation of a new stormwater drainage network in the suburbs of St Morris, Trinity Gardens, Maylands, and Stepney (known collectively as the ‘Trinity Valley’) undertaken in four stages.  

The upgrade project includes the installation of a new underground drainage network and stormwater detention basin at the St Morris reserve, to reduce the risk of flooding within the catchment area during significant rainfall events.

The works are designed to:

  • increase capacity of stormwater infrastructure
  • alleviate future flooding where possible
  • protect dwellings from future one in-100-year stormwater events
  • utilise Council reserves to act as detention areas
  • address upstream flooding to reduce pressure on downstream system.

Stage 4

Stage 4 includes works within St Morris Reserve, and the installation of large culverts, pipes and pits within the roadway of surrounding streets to increase the capacity of underground stormwater detention basin. 

The streets included in the Stage 4 works are:

  • Third Avenue (from Glynburn Road to Gardiner Avenue)
  • Green Street (from Third Avenue to Seventh Avenue
  • Seventh Avenue (from Green Street to Gage Street)
  • Gage Street (from Seventh Avenue to Gwynne Street).

View a map of the Stage 4 works areas:


The St Morris Reserve Upgrade will be funded as part of the Council’s $20m Trinity Valley Stormwater Upgrade Project.

The Federal Government is contributing $9.9 million as part of its Preparing Australian Communities Program, which targets projects that improve resilience against natural disasters. The investment is being matched dollar by dollar by the Council, resulting in a near $20 million investment to reduce the risk of flooding.

More information

For more information about the stages of the Trinity Valley Drainage Upgrade, visit:


Site Address

Cnr Green Street & Seventh Avenue, St Morris Reserve


Stage 4: $5,200,000

Project Contact

Contact Damian Costa

Contact role Project Manager, Civil

Phone 08 83664559


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  • Design concepts developed

    October 2023 – July 2024

    In progress

  • Construction to commence

    Late 2024


  • Construction complete

    Mid 2025