Oaklands Wetland - how it works

Oaklands Wetland can capture, clean and store up to 400 million litres of stormwater each year, when fully operational.

The process begins when water is pumped into a gross pollutant trap from the Sturt River. The trap removes stones, gravels, litter and organic matter from the water before it flows into the wetland’s inlet pond.

Water is then cleaned as it moves slowly through a series of ponds, which each use natural processes in various ways to clean the water. 

Sedimentation is a natural process where particles settle to the bottom of the wetland. Filtration is where plants naturally trap pollutants and excess nutrients.

It takes three days for the water to move through the wetland, where it can be injected into aquifers almost 100m below ground. From there, an 11.5km long distribution network will supply water to 31 reserves and other open public spaces for irrigation use.


What the wetland needs to work
  • Calm water
    The water needs to be calm for the particles to settle. We carefully manage how water flows through the wetland.
  • Healthy plants
    The plants are the filters of the wetland and we need them to grow and spread.
  • Native animals
    Native fish and other animals feed off the insects and balance the ecosystem. Pest species such as carp create muddy water. The City of Marion removes pest species.



Oaklands Wetland is a healthy wetland and has a low number of mosquitoes.

Levels of mosquitoes are regularly monitored at the site by Council in conjunction with the University of South Australia and the Adelaide and Mount Lofty Ranges Natural Resources Management Board.


More information

For more information about Oaklands Wetland please visit our Oaklands Wetland webpage.