Other Change Decision Notice - Council Meeting Decision 132005 638 04 (As Published)

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

     

 

 

 

ee ae to Tet ee) sores
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
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

™ covey 25-0042 Rpt Issue A

Document Set ID: 24377726 Page 59 of 72

Version: 13, Version Date: 23/12/2025