Attachment 4 - Stormwater Management Plan by O2 · MCU13/0251

Table 7– MUSIC Bioretention Parameters

Catchment ID                                                                      Bio-1   Bio-2   Bio-3     Bio-4

High flow bypass (m³/s)                                                           0.033     -     0.02        -
                   2
Surface area (m )                                                                  20      10      16        10

Extended detention depth (m)                                                       0.3     0.3     0.3       0.3
              2
Filter area (m )                                                                   20      10      16        10

Unlined filter media perimeter (m)                                                 42     19.1     24       19.1

Saturated hydraulic conductivity (mm/hr.)                                         200     200     200       200

Filter depth (m)                                                                   0.4     0.4     0.4       0.4

TN content of filter media (%)                                                    400     400     400       400

Orthophosphate content of filter media (mg/kg)                                     50      50      50        50

Is the base lined?                                                                 No      No      No        No

Vegetated with effective nutrient removal plants                                  Yes     Yes     Yes        Yes

Overflow weir width (m)                                                            2.8     1       2.1        1

Exfiltration rate (mm/hr.)                                                        0.00    0.00    0.00      0.00

If an exfiltration rate has been used, have node water balance losses been used
                                                                                  N/A     N/A     N/A       N/A
in calculation of treatment train effectiveness

If exfiltration rate has been used is the exfiltration rate justified?            N/A     N/A     N/A       N/A

Underdrain present?                                                               Yes     Yes     Yes        Yes

Submerged zone with carbon present?                                                No      No      No        No
                          *
Confirmation that K an C remain default                                           Yes     Yes     Yes        Yes
NOTE: High flow bypasses have been specified for the bioretention systems receiving runoff from the roof
catchments. This is considered to be a conservative modelling approach and takes into consideration the likelihood
that flows in excess of the minor (2 year ARI event) may surcharge the drainage network and potentially bypass the
bioretention system.

This SMP does not locate or provide detailed design of the bioretention filter. It is proposed that the
treatment system will be located within the landscape buffers proposed as part of the carpark area. The
final location and design of the system will be undertaken by the civil consultant in conjunction with the
landscape architect and will be provided as part of the detailed design phase of the project.

The conceptual layout of the drainage system is included as Appendix A.

5.9.           MUSIC Model
The MUSIC model produced to analyse the proposed development is shown in Figure 7.




STORMWATER MANAGEMENT PLAN – PEREGIAN VILLAGE MARKET                                                       Page 10

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