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Lake Hugh Muntz

Water quality update - 22 July 2019
Lake Hugh Muntz Algal Bloom

Water quality sampling has confirmed that blue-green algae levels at Lake Hugh Muntz have returned to acceptable levels in accordance with the National Health Medical Research Council Guidelines for Managing Risks in Recreational Water 2008.

Weekly water quality testing indicates that both the algae and toxin concentrations have declined and are no longer at a level where they pose a risk to public health.

Whilst the algal bloom has declined significantly, the species of algae that has persisted in Lake Hugh Muntz (Chrysosporom ovalisporum) is known to become activated during certain weather conditions, especially during warmer temperatures. This may result in another algal bloom in the near future as temperatures increase during summer.

Although temporary warning signage has been removed from the lake, please continue to exercise caution and avoid contact with water:

  • where scum or floating debris is visible;
  • that looks discoloured, murky or smells unpleasant;
  • near stormwater drains;
  • for up to three (3) days after heavy rainfall; or
  • if you have an open wound or infection.

Routine water quality sampling will continue at Lake Hugh Muntz to monitor conditions. Should conditions change, further advice will be provided.

Algal blooms and improving the lake

The City has allocated $100,000 in the current budget to directly assist with implementing feasible options to improve the lake. As a result, the City engaged Griffith University to provide specialist advice on ways to reduce future occurrences of algal blooms.

Click to enlarge Applying Phoslock to Lake Hugh Muntz

Applying Phoslock® to Lake Hugh Muntz

Griffith has researched twenty potential management options that have been used in Australia and around the world to help decide what may work best for the lake. A number of these options have already been implemented by the City, particularly in reducing sediment and organic matter from entering the lake. This includes:

  • planting approximately 200 plants around the lake in high use stormwater catchments
  • installing 66 gully baskets inside the stormwater drains to capture sediment and other litter. These nets capture 16,000 kilograms of organics every year that would otherwise enter the lake.

Griffith has also collected water samples from LHM and undertaken lab tests to trial the effects of some of these options. In addition, significant modelling work has been undertaken to increase the understanding of the lake ecosystem and to test different engineering options.

Routine water quality sampling will continue at LHM to assess the blue-green algae biovolume.

Read the study of management options to mitigate Algal Blooms in Lake Hugh Muntz completed by Griffith University for more information.

Click to enlarge Water quality testing at Lake Hugh Muntz

Water quality testing at Lake Hugh Muntz

All residents in the catchment area can contribute to improving the water quality in LHM. This can be done through minimising the amount of nutrient-rich water flowing from the surrounding properties into the stormwater drains. We ask that residents consider their own household behaviours such as the use of fertilisers, washing their cars and pets on grass instead of driveways, and correctly disposing of animal droppings.

The City also undertook a trial of Phoslock® in December 2018 to try and reduce the frequency and duration of future blooms. The City will continue to work closely with Griffith University to monitor the effectiveness of the Phoslock® testing.

View our Frequently asked questions and Informational video about Phoslock®.

Note: Algae blooms are a common and naturally occurring component of most fresh water and estuarine ecosystems and can be caused by various environmental conditions such as warmer temperatures, water turnover and nutrient levels. Blooms can often persist for a number of months until nutrient sources are depleted.

Water quality monitoring programs

The City has a range of ongoing water quality monitoring programs for Lake Hugh Muntz. These include the water quality monitoring program (WQMP), the routine recreational water quality monitoring program (RecWaters) and a Lake Hugh Muntz algae monitoring program.

The WQMP conducted in Lake Hugh Muntz sample the following parameters: temperature, electrical conductivity, pH, dissolved oxygen, total nitrogen, ammonia, oxidised nitrogen, total phosphorus, orthophosphate, turbidity, total suspended solids and chlorophyll a.

Click to enlarge Lake Hugh Muntz water quality location map

Lake Hugh Muntz water quality
location map

The Lake Hugh Muntz algae monitoring program is also being conducted under the guidance of the National Health and Medical Research Council Guidelines for Managing Risks in Recreational Water 2008.

Sampling is currently being performed at four locations around the lake: Bel Air Park; Warringah Park; Morialta Park; and Otway Park. Samples are collected for algal identification and biovolume, as well as pH, temperature, conductivity, dissolved oxygen and temperature.

View cyanobacteria biovolume data.

Worker monitoring water quality

Monitoring water quality helps to:

  • learn more about the ecological health of the lake and its suitability for recreation
  • identify trends in water quality
  • effectively investigate and diagnose water quality issues
  • compare results with national standards
  • measure the effectiveness of management efforts conducted by the City.

Find out more about waterways monitoring.

Other City programs around the lake

The City has initiated an increased schedule of street sweeping to help remove organic material from the roads and gutters. This program aims to help reduce organic loading into the lake.

The City’s mowing contractors mow the sections closest to the lake in a certain direction so that the ejected grass clippings are being blown away from the lake. The City investigated the use of having the mowing contractors use a catcher on the mowers but due to the size of the area to be mowed proved to be financially unviable.

Recreational water quality and public health

Cyanobacteria

The City is managing the lake in accordance with the levels and action framework included in the National Health Medical Research Guidelines for Managing Risks in Recreational Waters 2008 (the National guidelines). This is a nationally recognised standard. The City also is guided by the Queensland Harmful Algal Bloom Plan and Operational Procedures 2014. These procedures are applied across Queensland.

Water testing has identified a number of non-harmful species and a number of species that have the potential to produce toxins. The City has taken a precautionary approach and erected signage designed to further reduce potential risks to public health. This decision has been made on the basis of monitoring results that have identified toxin producing blue-green algae (BGA) at levels which exceed the National guidelines.

Despite the presence of BGA species that have the potential to produce toxins, toxins may not always be present. The production of toxins is difficult to predict and varies depending on a number of environmental and climatic factors. The primary routes of exposure during recreational water use can occur through:

  • direct contact with the body whilst swimming/recreating;
  • accidental ingestion of water; and
  • consumption of fish or shellfish caught within the waterbody.

For this reason, the City continues to monitor Lake Hugh Muntz and reminds residents and visitors (including their animals) to follow signed advice and refrain from contact with the lake.

Microbial water quality

The City is committed to managing and caring for our waterways. From time to time however, the quality of our waterways can change which can potentially affect the health of its users.

There is a strong link between rainfall events and the health of our waterways. Rainfall often collects pollutants from streets, gardens and farms, before it is flushed into our ocean and rivers via the storm water system. As a result, pathogens (bacteria, viruses and parasites) have an increased likelihood of being transported into our waterways from the catchment.

It is not possible to know the exact levels of pathogens or microbial pollution in a given waterway at all times, and the results from waterway monitoring only indicate the levels present at the time the sample was taken. It takes a minimum of 24 hours to obtain results by which time the microbial pollution may no longer be present.

The water quality at Lake Hugh Muntz is influenced by the local catchment area. Stormwater and residential run-off into the lake is untreated and can increase bacterial levels in the water making it unsafe for swimming. The City cannot guarantee suitable recreational water quality at Lake Hugh Muntz, due to the design and nature of the lake.

The City operates eight aquatic centres across the city that provide a safe swimming environment when water quality at Lake Hugh Muntz is unsuitable.

More information can be found on our Recreational water quality page.

Blue-green algae

Blue-green algae is a tiny micro-organism that belongs to the cyanobacteria family. The algae can be found in freshwater lake systems when there is an increase in nutrient level, sunlight and stable water columns.

To find out more about this micro-organism, download the Blue-green algae (cyanobacteria) fact sheet.


About Lake Hugh Muntz

Click to enlargeLake Hugh Muntz

Lake Hugh Muntz

Click to enlarge Lake Hugh Muntz

Lake Hugh Muntz

Lake Hugh Muntz is a constructed waterbody that was developed in the early 1980s. Extracted material from an area of the lake was used to build up the surrounding area to provide adequate height and flood protection for the subdivision. The general design of urban lakes during that period were undertaken to hold stormwater from the surrounding catchment.

The lake was named in honour of Councillor Muntz, OBE who was a member of the Albert Shire Council from August 17 1950 to January 24 1967 and then Chairman of the Council until his retirement in 1982.

Lake Hugh Muntz was the first lake to be constructed as part of the Robina Master Plan.

General characteristics of the lake are as follows:

  • forms part of the stormwater drainage system
  • provides a stormwater detention function
  • accepts stormwater from 16 pipe outlets
  • the lake receives an exchange of water from the nearby canal through a pipe under Barrier Reef Drive during periods of high tide
  • 17 hectares in area
  • depth varies up to 12 metres
  • volume of approximately 282 Olympic swimming pools
  • water in the lake is brackish – this means that it is neither saltwater nor freshwater
  • shoreline is 3298 metres.

When the lake was first constructed, it was filled predominantly through groundwater recharge and stormwater runoff and was considered a freshwater lake. During the first decade the lake experienced very low pH which has been attributed to the groundwater recharge. This low pH prevented the growth of aquatic plants in the lake and it was with the widening of the adjacent canal system that saline water could flow through the exchange pipe more freely. This intrusion of saline water helped the system become more pH neutral and aquatic life began to flourish.

During periods of drought the water salinity levels can fluctuate and the lake can alternate between fresh and brackish. These changes in salinity can affect the aquatic plant growth in the lake which is very important for good water quality.

Prior to urban development, the site was part of an extensive wetland and floodplain, consisting of vegetation communities such as Melaleuca swamp land. There is little evidence of these historical communities remaining.

Related information

Jump to key information
  • Can I swim at Lake Hugh Muntz?

    Lake Hugh Muntz was not designed as a primary recreation waterbody and cannot guarantee safe water quality at all times. The lake receives stormwater runoff from 16 stormwater pipes and urban runoff. The City does undertake routine water quality monitoring and provides health advice when required.

  • What is Phoslock®?

    Phoslock® is modified bentonite clay that works by binding the nutrients which the algae require to grow. It is used in water bodies that have high concentrations of phosphorus.

    Phoslock® has been used extensively around Australia and the world, having been successfully applied to over 400 water bodies. After rigorous testing by numerous ecological organisations, the product has been certified as safe for humans, animals and the environment.

    Visit Phoslock® to find out more.

  • Is Phoslock® safe?

    Phoslock® has undergone rigorous testing by numerous ecological organisations and is certified as safe for humans, animals and the environment.

    A representative from the company will be present on site every day during the application. They will be located in the secure compound and will have the correct personal protective equipment (PPE) equipment with them.

  • Where has Phoslock® been used in Australia?

    Phoslock Environmental Technologies has successfully implemented their products, including Phoslock®, in the following Australian waterways:

    • Narrows Lakes
    • Emu Lake
    • Torrens Lake
    • the Canning and Vasse Rivers
    • Australian Drinking Water Reservoir located in New South Wales.
  • What will happen if Phoslock® doesn’t work?

    Although the City does hope to see a vast improvement in the interim, there is no guarantee Phoslock® will stop the lake from undergoing another algal bloom. As such, the trial will be used to determine the performance of the product at Lake Hugh Muntz and to better inform options for the long-term lake management.

    We've been working closely with Griffith University who have researched twenty potential management options for the lake. Most of these options require further investigation prior to testing in the lake. In the meantime, we ask that residents consider their own household behaviours such as the use of fertilisers, washing their cars and pets on grass instead of driveways, and correctly disposing of animal droppings. These contribute significantly to the water quality in Lake Hugh Muntz.

  • What has the City done to help improve Lake Hugh Muntz?

    The following excerpt from the Lake Hugh Muntz management plan, describes planned strategies and their outcomes.

    Strategy Recommendation Priority Outcome
    1. Improvement of water quality (WQ) monitoring program 1.1 Ensure consistent timing of sampling Immediate Completed, ongoing reviews of the WQ monitoring program have been ongoing
    1.2 Increase sampling frequency from quarterly to monthly Medium for consideration Completed
    1.3 Consider deployment of two data loggers within ‘dead spots’ For consideration Investigated - under consideration
    1.4 Hydrolab DS5X : DO, pH, temp, cond, turbidity, chlo a, blue green algae, depth For consideration Investigated - under consideration
    2. Improvements to stormwater quality 2.1 Provide more rubbish bins in adjacent park areas Medium Completed, ongoing maintenance
    2.2 Undertake detailed investigation of stormwater infrastructure and prepare a stormwater improvement implementation plan High Completed
    2.3 Prepare the detailed design of stormwater improvement devices as per the recommendations of the stormwater improvement implementation plan Medium Completed
    2.5 Construction of bio retention filters Medium Investigated - Not feasible due to numerous constraints including, land acquisition, loss of on street parking
    2.6 Construction of stormwater wetlands Medium Investigated - Not a feasible option due to comments from community
    2.7 construction of vegetative swales either in combination with or as an alternative to bio retention filters Medium Investigated - Not a feasible option as per the detailed investigation of the stormwater improvement plan
    3. Control of aquatic vegetation and sediment assessment 3.1 Periodic harvesting of vegetation at entrance points for swimming Low: no current need. Review annually as required Completed – Ongoing site inspections – harvesting program under review
    3.2 Further benthic assessment investigation of submerged aquatic plant cover and sediment texture Medium - High Considered – No current aquatic plant cover
    3.3 Bioavailability testing of sediment contaminates* High In progress
    4. Control of pest fish populations 4.1 Bass stocking for control of noxious species Low Considered - Not completed due to lack of available habitat
    4.2 Consider further surveying to confirm species present Low Completed - Some further spot investigations have been undertaken (ongoing)
    5. Control of Algae / Cyanobacteria 5.1 Undertake a detailed monitoring program for 12 months to define on-going program. Include additional water quality sampling of; algae, chlor-a, nutrients, temp Medium Completed – ongoing water quality monitoring program
    5.2 Phoslock trial undertaken in an attempt to improve water quality High Completed
    5.3 Data interpretation and sampling re-evaluation Medium Completed – ongoing analysis of water quality data
    6. Information transfer 6.1 Produce and mail out information brochures Medium Completed – periodical
    6.2 Maintain updated website High: weekly algae report Completed – ongoing improvements will be undertaken
    6.3 Construct, design and install information / interpretive display boards in four adjacent parks Medium Completed – information sign installed at Bel Air Park

    *Sediment analysis is being undertaken from a number of locations around the lake.

  • How can I help to improve Lake Hugh Muntz?

    The stormwater entering Lake Hugh Muntz is largely untreated, therefore the growth of aquatic plants is highly dependent on the condition of the catchment and the way in which residents use chemicals (e.g. fertilisers) and dispose of waste (e.g. grass clippings, dog faeces). It is vital that all residents ensure that fertilisers, detergents, pet droppings, water from washing cars and pets, lawn and garden clippings don’t wash into the lake. When washed into the lake, these substances break down into a ready supply of plant-available nutrients, stimulating further aquatic plant and algal growth.

    Information about stormwater and the impacts of stormwater pollution on our waterways, can be found on our Stormwater responsible page.

  • Who do I contact when I find injured wildlife?

    If you find injured wildlife and can safely transport it, Currumbin Wildlife Sanctuary provides emergency veterinary care. Further information on injured wildlife can be found at Currumbin Wildlife Hospital Foundation.

    Alternatively, you can contact one of the Wildlife Rescue and Care organisations which can be found at Wildlife Preservation Society of Queensland.

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