Water Sensitive SA


What is a biofiltration system?

Water biofiltration is the process of improving water quality by filtering water through biologically influenced media. Stormwater biofiltration systems are known as biofilters, bioretention systems and raingardens.

A typical biofiltration system consists of a vegetated swale or basin overlaying a porous filter medium (usually soil-based) with a drainage pipe at the bottom. Stormwater is diverted from a kerb or pipe into the biofiltration system, where it flows through dense vegetation and temporarily ponds on the surface before slowly filtering down through the filter media.


What is a raingarden? Source: Resilient East

Types of biofiltration systems

Streetscape raingardens

Jarman Terrace, Flinders Park, City of Charles Sturt
Jarman Terrace, Flinders Park

Biofiltration basins

Unity Park, Pooraka, City of Salisbury
Unity Park, Pooraka

Biofiltration swales

Dover Street Reserve, Aldinga Beach, City of Onkaparinga
Dover Street Reserve, Aldinga

Why choose a biofiltration system?

As at 2013, it was estimated (that stormwater contributed 6,180 tonnes of sediment (77% of total annual load of sediments to marine waters) and 150 tonnes of nitrogen to the Gulf St Vincent every year. (Adelaide Coastal Water Quality Improvement Plan ACWQIP PDF, EPA 2013). Biofilters have been proven to be effective at removing pollution transported via stormwater runoff before it reaches our waterways and coastal environments.


Technical resources

Coming soon - narrow

Standard drawings

Acknowledgement of Country

Water Sensitive SA acknowledges Aboriginal people as the First Peoples and Nations of the lands and waters we live and work upon, and we pay our respects to their Elders past, present and emerging. We acknowledge and respect the deep spiritual connection and the relationship that Aboriginal and Torres Strait Islander people have to Country.