Judgment - Stockwell v Noosa Council - PEC Appeal 1998 of 2024 - 26.06.25 · MCU22/0094

6.4.3 Stormwater Quality Management Strategy

In order to satisfy the requirements of the State Planning Policy July 2017 for the adequate treatment of
stormwater runoff, natural treatment solutions have been provided to remove hydrocarbons, suspended
solids and nutrients prior to being discharged from site.

6.4.3.1 Potential Pollutants Generated

The pollutants that could be potentially generated as a result of the development use are as follows:
•    Litter
•    Sediment
•    Nutrients (Nitrogen and Phosphorous)
•    Hydrocarbons (oils and grease)
•    Surfactants
•    Pathogens/Faecal Coliforms (bacteria and viruses)

The MUSIC computer modelling program developed by the Co-operative Research Centre for
Catchment Hydrology was used to predict the performance of the proposed stormwater treatment train.

At this stage the pollutants modelled in MUSIC are Total Suspended Solids (TSS), Total Phosphorous (TP)
and Total Nitrogen (TN).

6.4.3.2 Rainfall

The rainfall data used in the model was based on the Bureau of Meteorology data from rainfall station
40059 Cooroy Composite. The model was run for a 10-year period from 1 January 1973 to 31 December
1983. The modelling time step was 6 minutes.

6.4.3.3 Rainfall Runoff Properties

In accordance with the recommendations of Water By Design’s MUSIC Modelling Guidelines for South
East Queensland rainfall runoff properties for commercial areas have been used.

These are listed in Table 1.




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Inspired engineering

10 April 2025
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