Stormwater management plan 20220156 9 Kauri St SWMP

                    4.2.1.2.             Bioretention Areas
An end of line bioretention area will provide treatment to all stormwater runoff captured within the internal
drainage network before it is discharged from the development.

The bioretention area will not be lined to allow for run-off to be infiltrated into the soils for disposal and ground
water replenishment. A geotechnical analysis of the proposed bioretention garden location consisting of soil
boreholes and falling head soil permeability tests has identified that the soils at the location can support a design
load rate of 14.36mm/day representing the effective exfiltration rate from the unlined perimeter of the garden
during a storm event. Refer to Appendix C Soil Borehole Data & Permeability Calculations for details of these
calculations. d

The bioretention areas are modelled in accordance with the Water by Design MUSIC Guidelines 2018 with the
node configuration shown below in Figure 4.5 – Bioretention Node details.




                                                  Figure 4.5 – Bioretention Node details

Table 4.4 – Indicative Bioretention Area Plantings below based on the Brisbane City Council Water Sensitive Urban
Design Engineering Guidelines presents a sample of suitable plants that may be used to provide effective removal
of nutrients in the areas however a landscaping specialist should be consulted to confirm final species to be
planted.

Table 4.4 – Indicative Bioretention Area Plantings

                                                                                                                Planting
                                                                                                                Density
 Scientific Name                                  Common Name                    Form          Height (mm)      (Qty/m²)
 Myoporum parvifolium                             Creeping Boobialla             Prostrate                150   4-6
 Cymbopogon refractus                             Barbed Wire Grass              Tufted                   300   8-10
 Cyperus polystachyos                             Bunchy Sedge                   Tufted                   600   6-8
 Dianella brevipendunculata                       Flax Lily                      Tufted                   500   4-6
 Dianella caerulea cv ‘Breeze’                    Blue Flax-lily                 Tufted                   600   4-6
 Dianella caerulea cv ‘Little Jess’               Blue Flax-lily                 Tufted                   400   4-6
 Dianella longifolia var. longifolia              Pale Flax-lily                 Tufted                   550   6-8


Project number 20220156
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