UPDATED DA - Attachment 10 Stormwater Management Plan

                                      STORMWATER MANAGEMENT PLAN

Client: Noosa Shire Council                                                                       Location: Doonan


5.0      STORMWATER QUALITY
This section of this SMP will demonstrate how the proposed stormwater quality management strategy will
comply with the requirements of the NSC and the SPP (2017) by demonstrating how the relevant stormwater
pollutant reduction objectives will be met.

Stormwater runoff generated from the site must achieve the required pollutant reduction targets required
under the State Planning Policy (2017) and the Noosa Shire Council’s Planning Scheme (2020). These targets
are listed in Table 5-1. MUSIC modelling software version 6.3.0 was used to demonstrate compliance with
these pollutant reduction targets in this assessment.

                           Table 5-1 Pollutant Reduction Targets for Southeast Queensland

                     Pollutant Type                               Reduction Objective
              Total Suspended Solids (TSS)          80% reduction in average annual load of pollutants
                  Total Phosphorus (TP)             60% reduction in average annual load of pollutants
                   Total Nitrogen (TN)              45% reduction in average annual load of pollutants
                  Gross Pollutants (GP)             90% reduction in average annual load of pollutants

5.1     Water Quality Monitoring
5.1.1    Treatable Areas
The total treatable area for this water quality assessment is approximately 2.24 ha. The total treatable area
includes the existing development and associated road and carpark areas, as shown on Figure 5-1.

5.1.2    Scenario Method
The proposed development was modelled in MUSIC using split catchment source nodes. Three (3) industrial
source nodes were identified, comprising of road, ground cover and roof nodes. The proposed development
was modelled as two (2) sub-catchments (A and B).




                                                     7                                         Project No: 244035
                                                                                              M25-0042 Rpt Issue A