Edwardes Lake wetland treatment system
The Edwardes Lake wetland system has helped to restore the much-loved Edwardes Lake park to a more natural condition, providing habitat for an abundance of wildlife and a large green space for the community. It also helps to filter stormwater and reduce the risk of flooding to surrounding properties.
Edwardes Lake is a constructed lake located in the suburb of Reservoir, in the north of Darebin. It is one of the largest lakes in Melbourne, with a water storage capacity of about 85 million litres (85 megalitres) and an area of over six hectares. The lake forms part of the Edwardes Lake parklands, a 28 hectare park which is visited by over 135,000 people each year. It is also an important habitat for birds and other wildlife.
The Edwardes Lake wetland treatment system was created to address ongoing water quality issues in the lake that began when the surrounding area was developed for housing and industrial use in the 1950s-60s. The system collects stormwater (rainwater that runs off hard surfaces such as roofs, roads and carparks) from the local area and channels it into a flood retardant basin (a low-lying wetland that holds stormwater that could otherwise cause flooding).
The flood retardant basin slows down the flow of the stormwater, allowing sediment (small particles of soil, litter and other contaminants) to settle to the bottom, making the water cleaner. The wetland plants and bed layers help to filter the water further before it flows into Edwardes Lake. A gross pollutant trap that acts like a big sieve also removes any large pieces of litter like bottles and plastic bags.
Water stored in Edwardes Lake can be used by Darebin City Council to irrigate (water the grass and plants of) many of its public reserves and properties. The water from the lake is used in place of potable (drinking) water, saving Council and rate-payers money and preserving the community’s drinking water supply.
- Reduced risk of flooding of nearby homes and properties.
- Less stormwater entering Edgars Creek and the Merri Creek.
- Cleaner stormwater entering Edgars Creek and the Merri Creek.
- Improved water quality in Edwardes Lake.
- Large area of natural wetland habitat for an abundance of wildlife.
- Large wetland area for community recreation.
- Large volume of treated stormwater stored for reuse in irrigation.