What trees are being managed?

    Two introduced invasive tree species will be managed 

    Casuarina cunninghamii

    https://florabase.dpaw.wa.gov.au/browse/profile/18313

    Melaleuca quinquenervia

    https://en.wikipedia.org/wiki/Melaleuca_quinquenervia

    The revegetation area in question is classified as completely degraded and dominated by Melaleuca quinquenervia and Casuarina cunninghamiana. These species have been identified as requiring management by the Department of Biodiversity Conservations and attractions (DBCA). As part of the Maylands Lakes Restoration Plan the City is seeking to increase riparian vegetation along the lake shore to assist with nutrient stripping and create a more diverse habitat reflective of a naturally occurring environment to provide habitat for fauna.  The invasive species have formed a root shelf preventing the establishment of riparian vegetation and turtle nesting at the site. Works are being undertaken in collaboration with the friends of Maylands Lakes who successfully obtained grant funding to support the restoration. Eucalyptus species in the area will be retained and several thousand species endemic to the area will be planted as part for the revegetation.  This methodology has been highly effective at previous rehabilitation sites on Lake Brearley and Brickworks Stream. A Community planting day will be held on June 25 and will begin the process of creating a biodiverse natural area. 

    What will the City do to improve the quality of the water in the lakes?

    The City will progressively:

    • Install mechanical mixers to improve oxygen levels in Lake Brearley and Lake Bungana
    • Dredge Lake Brearley in shallow midge breeding areas
    • Undertake 3D modelling to see how the water moves around the lakes and determine the best location for the mixers
    • Complete a fauna study of the lakes and surrounds
    • Monitor the health of the water
    • Provide opportunities for community education and involvement
    • Develop a plan to progressively transform stormwater inlets near the lakes i.e. rain gardens
    • Prioritise the restoration of lake foreshores by planting species endemic to the area, and maintain and replace infrastructure

    How can I get involved?

    Attend the planting days, community information sessions, and press the follow button on this website so you can be notified about updates.

    What are the Maylands Lakes?

    The man-made lakes at the Brickworks, Lake Bungana and Lake Brearley were built in the late 1990s in former clay pits, with a traditional "pit and pipe" stormwater system. Water quality issues have led to the occurrence of persistent algal blooms, increased midge breeding and significant community concern. 

    What action has the City and community taken so far?

    A program of works at Brickworks Lake included weed removal, a new nutrient barrier between this lake and Lake Bungana, installation of an aerator, and planting of sedges.

    Algal treatment and addition of floating wetlands at all three lakes.

    Replacement and repositioning of water fountains on Lake Brearley and Lake Bungana.

    Planting of 15,000 sedges in the shallows of Bungana and Brearley lakes.

    Dredging of Lake Bungana.

    Further algal treatments of the three lakes.

    An additional 10,000 plants including revegetation of Brickworks stream.

    Installation of two solar powered ultrasonic devices in Lake Brearley as part of a 12 month trial.

    Installation of large mechanical mixers in both lakes.

    How has the community been consulted?

    The City has been liaising with various groups and residents over the past five years.

    A community information session on 14 October 2020 with 90 attendees provided feedback, including:

    • The urgent need to address midge levels and water quality
    • The need to have a sustainable solution
    • Mixed views on dredging, although support for dredging as a quicker fix
    • Recognition of the value of the flora, fauna and amenity  

    Visit this page again to find out future opportunities to have your say.

    Why is this a complex problem to solve?

    The complexity and challenging nature of poor water quality and high midge levels is compounded at Maylands Lakes by:

    • the large size of the lakes
    • presence of hard walls
    • location near residential areas
    • unusual shape
    • significant depth
    • shallow layer of sediment



    What are the key findings of the GHD report?

    The monitoring report found that a lack of oxygen at depth allowed nutrient to be released from sediment at the bottom of the lakes.

    In summary:

    • Shallow and deep water in Lake Brearley and Lake Bungana does not mix for most of the year
    • This contributes to a lack of oxygen at depth, allowing nutrients to be released from sediment
    • The lakes are overly enriched with nutrients with high levels of algae all year round
    • Nutrients include stormwater runoff, bird poo, and those released from sediment at the bottom of the lake  


    What does GHD recommend in the immediate term?

    • Installing mechanical mixers to improve the mix of shallow and deep water
    • Water quality monitoring
    • Working out how the water moves in the lakes to allow the best decisions on how to manage the problems
    • Community consultation


    How did the tree planting days go?

    • We exceeded our planting expectations for our two planting days in December 2020.
    • We planted about 10,000 plants, more than doubled the area for native vegetation and been able to achieve some of the bank modifications identified in the 2016 Essential Environmental report
    • Thanks to the Friends of group for securing grant funding and their help arranging community planting days.
    • Fantastic turnout from community members to support the planting days
    • The restoration will provide improved habitat for native animals and positively contribute to lake water quality.
    • We look forward to you joining us for further planting days in 2021.