Response to Further advice - 20220156 Kauri St SWMP · MCU22/0144

                                   Figure 4.4 - Ecosol Litter Basket Pollutant Removal Efficiencies




                    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 have a Ksat value of 0.0998cm/min,
equivalent to 59.88mm/hr (indicative of a sandy clay) which is used to represent the exfiltration rates into the
surrounding soils from the garden. Refer to Appendix C Soil Borehole Data & Permeability Calculations for details
of these calculations.

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.




Project number 20220156                                                                                       Page 16 of 28
File RECOR Stormwater Management Report - 20220156.docx, 2023-01-13 Revision 2

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