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
Benefit 5 - Streetscape raingardens can deliver uplift on property values
|Project outcomes||Equivalent once-off payment|
For every extra house that is
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.