Melbourne Water will be upgrading the Lillydale Lake Wetland to continue its important work of keeping our rivers and creeks healthy.
Wetlands are a series of shallow, densely planted, man-made ponds that help filter pollutants that wash into our stormwater drains from roads, hard surfaces, parks and gardens. The wetland acts as a natural filtration system that captures pollutants before entering our rivers and oceans.
Why the works are necessary
The Lillydale Lake Wetland is currently not performing to stormwater treatment quality standards. This is due to inadequate vegetation cover as the wetland is too deep for plants to survive. Additionally, water flows from the Olinda Creek are entering the wetland too quickly for its natural filtration process to occur. As a result, the wetland needs to be upgraded to restore it to its original process.
What do the works involve?
Works to upgrade the wetland will include:
- Removing vegetation within the current wetland to enter and exit the site
- Draining the wetland
- Reshaping the base with machinery to correct water depths
- Mixing lime with sediment to reduce acidity and support new plant growth
- Modifying the inlet and outlet flows to manage flows from Olinda Creek
- Revegetating the wetland with new plants to support the filtering of pollutants
- Removing and stockpiling of wetland sediment
Location of works
Local impact of the works
We will make every effort to minimise the impact of these essential works on the local community and the environment; however during construction you may notice:
- The closure of the pedestrian boardwalk over the wetland
- Narrowed pathways surrounding the wetland with detours in place
- Noise from machinery
- Increase truck movements
- Some odour as stockpiled sediment dries out
- Removal of some vegetation to access the wetland
What to expect and when
The wetter winter months are deemed unsuitable for undertaking earthworks to reshape the wetland, therefore construction has temporarily stopped. No construction work will be undertaken from August-October.
The project is being undertaken in two stages:
- Stage One will involve draining the wetland, drying and treating stockpiled sediment, and reshaping the base of the wetland. This work will recommence in November and we expect to finish it by mid-2021.
- Stage Two will involve revegetating the wetland area, which is expected to take place in late 2021-early 2022 when the weather is better suited for plant growth.
We will provide regular updates on the progress of these works. If you would like any further information, please do not hesitate to contact the project team: