BBNE00529_0002_0001-REP-001-1-73 Eumundi-Noosa Rd SMP

3.4        Treatment System
The approved / constructed bioretention basin is proposed to treat the stormwater runoff from the Site, which includes the proposed
townhouse site. The location of the bioretention system is co-located with the detention basin and will be located in the north-east corner
of the site, just upstream of Sands Avenue (site outlet). An indicative footprint area has been set aside to the north of the proposed car
parking area. A standard bioretention filter media configuration is proposed, with a typical section detail shown in Figure 2.2.




Figure 2.2: Typical Conventional Bioretention Filter Section (Water by Design, 2014)


  3.4.1       Treatment Train Sizing
The bioretention basin has been modelled in MUSIC in accordance with the Water by Design MUSIC Modelling Guidelines. The modelled
bioretention system properties are summarized in Table 3.5. The MUSIC model layout can be seen in Figure 2.3.

TABLE 3.5: BIORETENTION PARAMETERS

 Parameter                                                            Value

 Extended Detention Depth (m)                                         0.3


 Storage Surface Area (m2)                                            575


 Filter Media Area (m2)                                               403


 Unlined Filter Media Perimeter (m)                                   0


 Saturated Hydraulic Conductivity (mm/hr)                             200


 Filter Depth (m)                                                     0.5


 TN Content of Filter Media (mg/kg)                                   400


 Orthophosphate Content of Filter Media (mg/kg)                       30


 Exfiltration Rate (mm/hr)                                            0




73 EUMUNDI - NOOSA ROAD, NOOSAVILLE I BBNE00529_0002_0001-REP-001-1                                                                      9