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

6.4.3.5 Water Quality Objectives

The Water Quality Objectives of the receiving waters for the proposed development have been obtained
from State Planning Policy July 2017. The State Planning Policy load reduction targets are summarised in
Table 3 below.
                                                            Water Quality Objectives
  Total Suspended                                                                                     Litter/Gross
                                Total Nitrogen (TN) Total Phosphorous
     Solids (TSS) %                                                                                  Pollutants %                    Oils/Grease
                                      % Reduction                 (TP) % Reduction
        Reduction                                                                                      Reduction
             80                              45                              60                              90                  No visible films or
                                                                                                                                         odours
                                                     Table 3 – Water Quality Objectives

6.4.3.6 Treatment Plan

In order to achieve the Water Quality Objectives for the proposed development, it is proposed to use
both natural treatment and mechanical treatment methods to treat the runoff prior to discharge from
the site.

Stormwater runoff from the roof will be captured in a series of new gutters, downpipes and pits, which will
discharge along with the remaining on ground catchments to the bioretention basins, where Q1 flows will
receive treatment while additional flows will discharge into the external stormwater network. The
landscaped area fronting the site will be conveyed and captured into a pit and pipe system, which will
be treated by an OceanProtect Jellyfish filter configuration, located within the driveway. Treated water
will connected into the existing stormwater infrastructure on Hofmann Drive.

Approximately 330m2 of the access driveway, pavement and landscaped areas, to the south of the
bioretention basin at the entry and the landscape buffer area, will bypass the bioretention basins and
the OceanProtect Jellyfish device to allow the driveways to join neatly into the existing external road. The
treated areas will be over treated so the overall net water quality objectives are achieved for the
development.




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Inspired engineering

10 April 2025
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https://mpncnetau.sharepoint.com/sites/Administration/Shared Documents/9000-9999/9300-9399/9307/Reports/10-04-25 Stormwater Management Plan_Issue G.docx