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Trinity Valley Stormwater Upgrade Stages 2 & 3

Trinity Valley Stormwater Upgrade Stages 2 & 3

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Category: Stormwater drainage network

Project management

Managed by City of Norwood Payneham & St Peters

Design: Stantec Australia

Contractor: BMD

Trinity Valley Drainage Upgrade overview

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

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.


Timeframe

The Trinity Valley Drainage Upgrade will be delivered in four stages over a four-year period from 2021 to 2025 as follows: 

  • Stage 2 & 3: October 2023 – May 2024
  • Stage 4: March 2024 – Late-2024
  • Stage 1: August 2024 – January 2025


Stages 2 & 3

The Stage 2 Stormwater upgrade will be undertaken along Albermarle Ave and Ashbrook Ave, Trinity Gardens. The works include installation of large culverts, pipes and pits within the roadway, followed by a full depth pavement reconstruction.

The Stage 3 Stormwater upgrade have been undertaken along Jones Ave and Amherst Ave adjacent the Trinity Gardens Primary School.

The works include installation of large culverts, pipes and pits within the roadway, followed by a full depth pavement reconstruction on Jones Ave. 

View a map of Stage 2 & 3 works areas:

Project funding

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.

Site Address

Trinity Gardens

Cost

Stage 2 & 3: $7,300,000

Project Contact

Contact Michael Moshos

Contact role Project Manager, Civil

Email trinityvalley@npsp.sa.gov.au

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Latest News

Works on the stormwater upgrade project have commenced.

Starting at the western end of Albermarle Avenue, Council’s contractor, BMD will be connecting into the existing infrastructure at Portrush Road before heading east, installing new stormwater infrastructure towards Amherst Avenue.

Upcoming Night works – to minimise the impact to traffic on Portrush Road and to support continued access to the local primary school a new connection into existing stormwater drainage on Portrush Road will be undertaken at night.

The night works will be undertaken at the western end of Jones Avenue and in the southbound lanes of Portrush Road between the hours of 7pm and 6am, from 11 December to 15 December 2023, weather permitting.

Traffic on Portrush Road will be maintained in both directions adjacent the works, but reduced to one lane for each way of travel.

Jones Avenue will be closed to through traffic during the night works.

Council’s contractor, BMD has worked hard over the holiday season to complete Stage 3 works in Jones Avenue, Amherst Avenue and Aberdare Avenue in time for school returning at the end of January.

Some minor finishing works will be undertaken as part of Stage 3 during February; however, this will be during school hours to avoid impacts to local traffic.

With Stage 3 largely completed, works will recommence on Stage 2 which includes installation of large culverts and stormwater pipes along Albermarle Avenue up to and including the roundabout at Ashbrook Avenue.

Whilst works are undertaken, traffic will be reduced to one lane in an eastbound direction along Albermarle Avenue a to ensure safety for road users and onsite crews.

To avoid frustration, motorists are encouraged to use alternate routes to access Portrush Road for the duration of the works.

Some properties on the southern side of Albermarle Avenue will experience periods of restricted driveway access during upcoming construction works. If your property is impacted, Council will contact you directly to provide more details ahead of the works occurring.

Upcoming road closure – Albermarle Avenue between Portrush Road and Annesley Avenue
Friday 22 March to Saturday 23 March.

As part of the Stage 2 drainage upgrade works, road resurfacing works will be undertaken on Albermarle Avenue between Portrush Road and Amherst Avenue. The remaining portion of Albermarle Avenue, through to Annesley Avenue will be closed to through traffic for the storage of construction plant and material.

Traffic and Access:
• Local access to properties on Albermarle Avenue will be maintained via Annesley Avenue.
• In preparation for the works, on-street parking along Albermarle Avenue (in the area of the closure) will not be available from 5pm, Thursday 21 March.
• Access for pedestrians will be maintained at all times, with some changes to access arrangements to ensure safety is maintained. Please observe onsite signage and follow the direction of traffic controllers.

Please be advised, further road resurfacing works will be undertaken in coming weeks as part of the completion of the project. Further details regarding these works will be made available ahead of the works commencing.

Upcoming road closure - Albermarle Avenue between Amherst Avenue to Ashbrook Avenue
Monday 29 April to Monday 3 May.

Stage 2 works are nearing completion, with the last road resurfacing works scheduled to occur late April / early May (weather permitting).

Traffic and Access:
• Vehicle access to properties along Albermarle Ave will be unavailable during the road closure. Parking is available for residents on the nearest side street.
• The intersections along Albermarle Ave with Annesley Ave, Aveland Ave, and Avonmore Ave will also see progressive closures to the north-south bound movements during the road closure.
• Intersection closures will be in place at Albermarle Ave, from Portrush Road to Amherst Ave on Friday, 3rd May and Albermarle Ave with Ashbrook Rd on Monday 6th May.
• Access for pedestrians will be maintained at all times, with some changes to access arrangements to ensure safety is maintained. Please observe onsite signage and follow the directions of traffic controllers.
• Council’s waste collection contractor, EastWaste, will not have access to Albermarle Avenue on Thursday 2nd May for rubbish collection. For properties that are impacted by the road closure, bins can be placed in the nearest side street for collection.

Thank you to the community and residents for their cooperation whilst these final works are undertaken.

FAQ's

Why are the Council upgrading the stormwater drainage network?

In 2016, Council undertook City-wide floodplain mapping which identified locations which are at risk from flooding and considered a range of future scenarios, including infill development and the ongoing impacts of climate change.

Council has developed and endorsed a Stormwater Drainage Program to address the findings of this report that will be delivered over a 15-year period. The next stage of works will focus on the upgrade of the Trinity Valley stormwater management network.

The ‘Trinity Valley’ (comprising the suburbs of St Morris, Trinity Gardens, Maylands, and Stepney) Drainage Upgrade will be delivered in four stages, between 2021-2025. The upgrade works will involve the installation of a new underground stormwater management network to increase capacity and provide improved flood mitigation during significant rainfall events.

What does the Trinity Valley Drainage Upgrade, Stages 2 & 3 involve?

Stages and 3 will be undertaken in the suburb of Trinity Gardens, with work to include the installation of new stormwater infrastructure, including culverts, pipes, and stormwater pits.

In some areas, the work will also include the reconstruction of existing roads with new asphalt as part of Council’s annual asset renewal program.

To accommodate the new, often larger stormwater infrastructure some alterations to existing SA Water connections also needs to be undertaken. It is expected that these works can be completed with minimal disruption to service supply.

When will the Trinity Valley Drainage Upgrade, Stages 2 and 3 be constructed?

Council has engaged with local stakeholders to develop a program for the work that limits the impact of construction activities on local business and community.

The upgrade will be undertaken over two stages, as follows:

STAGE 2 Stormwater Upgrade works will be undertaken along Albermarle Avenue and Ashbrook Avenue in the suburb of Trinity Gardens. These works are expected to commence in October 2023 and be completed May 2024.

STAGE 3 Stormwater Upgrade works will be undertaken along Jones Avenue, Amherst Avenue and Aberdare Avenue. These works are programmed to be undertaken during school holidays (16 December 2023 to 26 January 2024) to avoid disruption to the school community.

Will there be traffic restrictions in place during the works?

The construction work to install large culverts and pits requires sizeable trenches to be excavated in the road corridor. Most roads impacted by the Upgrade will require a reduction to one-way traffic, and some intersecting roads will experience up to two-day closures. Some short-term closures will also be required to property access (driveways) to enable the construction works.

For the Stage 3 works, to complete the construction works over the December/January 2023-2024 school holidays, Jones Avenue will be temporarily closed from Portrush Road to Amherst Avenue for the period of construction whilst the drainage and road reconstruction occurs. The full road closure will allow construction to be undertaken expediently, and without disruption.

More information regarding traffic arrangements during construction can be found on this website.

Will access to my property be impacted?

At times during construction, driveway access to your property may be impacted for a short period. In the event that property access is impacted, we will contact you ahead of these works occurring.

Do I need to do anything to modify stormwater management within my property boundary?

Property owners will not be required to modify their existing stormwater arrangements.

How can I learn more about the Drainage Upgrade?

You can learn more about the Trinity Valley Drainage Upgrade by visiting this page or call our Citizens Service Team on 08 8366 4555.

How can I register for construction updates as the work progresses?

If you would like to be kept up to date as works progress, please email trinityvalley@npsp.sa.gov.au