Water Sensitive SA

Biofiltration – Benefits

Benefit 1 - Biofiltration systems can remove heavy metals and hydrocarbons from stormwater

Biofiltration systems built in accordance with current best practice are very effective in removing heavy metals (Zhang et. al. 2012; Feng, et. al. 2012; Zinger & Deletic 2011) and hydrocarbons, while less effective for removing pesticides.


Benefit 2 - A submerged zone in biofilters enhances pollutant removal

The presence of a submerged zone in biofilters increases the overall removal of pathogens and nutrients (Payne, et. al. 2013 PDF).


Benefit 3 - Raingardens have 10% land take compared with wetlands for equivalent treatment

Raingardens are an effective way to remove sediments and nutrients from stormwater and require approximately 10% space of a wetland for equivalent treatment performance.


Benefit 4 - Biofilters are a low energy stormwater treatment technology

with the potential to provide both water quality and quantity benefits (CRC for Water Sensitive Cities, 2015, Adoption Guidelines for Stormwater Biofiltration Systems)


Benefit 5 - Streetscape raingardens can deliver uplift on property values

Project outcomes Equivalent once-off payment

For every extra house that is

  • within 50m of a raingarden
  • within 100m of a raingarden

 

  • $36,000 per property
  • $54,000 per property

Polyakov M, Iftekhar S, Zhang F and Fogarty J (2015) The amenity value of WSUD infrastructure: A case study on raingardens. Proceedings of the 59th Annual Conference of the Australian Agricultural and Resource Economics Society. Rotorua, New Zealand.

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.