Attachment 7- Site Based Stormwater Management Plan

some biological uptake. Refer to Figure 4.1 below showing a typical cross section of a
bioretention basin.




                             Figure 4.1 Typical cross section of a bioretention basin


Bioretention provides a number of functions including:
      Reduce the velocity of runoff;
         Trap sediment and associated pollutants; and
         Reduce concentrations of nutrients such as Nitrogen and Phosphorous.


The detailed design, construction and maintenance of bioretention basins should be in
accordance with the ‘WSUD Technical Design Guidelines’. Plant species for bioretention
basins within this development should be selected based on WSUD Technical Design
Guidelines, and the integration with the landscape design.


Establishing Bioretention Basins
The establishment period for plant species before the vegetation is mature and fully
functional is typically two years. During this period, regular site maintenance and monitoring
is crucial to the success of the basin as a treatment device




4.2.2 Bioretention Street Tree (Tree Pit)

Bioretention Street Trees are a combination of a bioretention system and a street tree. They
are typically designed to be small systems able to accommodate trees suitable for use in
streetscapes and shrubs for additional nutrient uptake and aesthetics.




Site Based Stormwater Management Plan                                                   Page 8 of 20
1856-SBSMP-01_Version 2.0 (April 2019)