SUPERDEDED NEGOTIATED - OPW25 0042 - Approved Plans (As Published) · 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
                                                                                                  Page 15 of 9
                     SH/PL
                                              Brah101 Pty Ltd t/as ALTA PROJECTS
Document Set ID: 23646596
Version: 1, Version Date: 21/03/2025