Rain garden - Isabella Plains (Lake Tuggeranong catchment)

7/11/2018 – Planting is complete

24/10/2018 - Bird netting goes up next week after which macrophyte planting will begin

8/8/2018 – The public access path is complete.

16/10/2018 – Bird netting is being installed in preparation for macrophytes (water plants either in or around the wetland) planting.


Once complete, this rain garden will be the biggest in the southern hemisphere.

Located in parkland beside Upper Stranger Pond, it will have a treatment area of 5200m2 and, when it rains, will treat about 1800 litres of stormwater a second before it enters Lake Tuggeranong.

The Lake Tuggeranong catchment was identified as a priority when planning for ACT Healthy Waterways first began. The ACT Government knows the community is concerned about water quality and this project focuses on limiting the amount of pollutants entering the lake.

Stormwater run-off is the biggest source of water pollution in our creeks and lakes, posing a risk to public health and aquatic life and threatening the many social, economic and environmental benefits our lakes and waterways offer.

Catchment Lake Tuggeranong
Start date November 2017
Construction finished August 2018
Anticipated establishment period Two years from open date*
Open for public use September 2018

+ Construction may be delayed by a number of factors, including bad weather.
^ The vegetation establishment period may change depending on ground and weather conditions. During the establishment period, flows into and through the asset will be managed to suit the conditions and to protect and nurture the plants.
* Some areas of the site may remain closed to allow for plants to establish.

Design changes

During the final design phase, some changes were made to the original concept designs to accommodate community feedback, make best use of the existing terrain, reduce project costs and maximise water quality outcomes.

  • The existing open gross pollutant trap (GPT) will be extended in place of the planned additional GPT and diversion pipe.
  • The treatment area has been divided into two sections to eliminate the need to re-lay an existing stormwater pipe.
  • A fringing swale has been added to divert major surface water flows around the treatment area.

More information

Find out what you can do on your own block to improve water quality in our lakes and waterways.

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Find out about other ACT Healthy Waterways projects.

Rain gardens are great for backyards as well. Learn how to build your own rain garden.

How this project might impact you

  • Trucks will pass in and out of the area during the improvement work. Routes have been established to minimise traffic disruption and noise.
  • The construction site will be fenced for public safety during the entire length of the project.
  • The contractor has prepared a Construction Environment Management Plan (CEMP) to detail how it will deal with flora and fauna issues.

Landscape design plan

Click on the image to enlarge.

Rain garden landscape design for Upper Stranger Pond