Stormwater Management Plan -OPW (A) · OPW25/0042

8.0 STORMWATER QUALITY

Stormwater runoff from roofed and hardstand areas is to be treated prior to
infiltration via small bioretention basins surrounding discrete RIPs and a
large consolidated bioretention basins adjacent the RIC .

Piped low flows (<3 month ARI) from catchments to be treated will generally
discharge to bioretention surfaces while larger flows will discharge directly to
RIPs/RIC.

Rainwater harvesting and re-use will be employed as discussed in Section 5.0.

Largely soft-landscaped catchments 4/1, 4A/1 and 4B/1 are to be directed to
the ephemeral stream (vegetated swale) constructed along the external
catchment drainage line discussed in Section 5.

Existing vegetated areas where no significant works are proposed are
excluded from modelling on the basis that they will continue to infiltrate
incident rainfall as per the existing pre-development case.

Infiltration via RIPs/RIC is conservatively ignored in the Quality MUSIC
Model.




8.1 QUALITY MUSIC MODEL

The efficiency of the proposed treatment train has been identified by the
Model for Urban Stormwater Improvement Conceptualisation
(MUSICXV1.1.0) developed by Monash University.

A conceptual layout of the treatment train as input to the Quality MUSIC
Model is shown in Figure 8.1




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A6769/25/SWMP/Rev OpW(A) – Feb 2025
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