RFI - P0478-26-001_45_Maple_Street_Cooroy_SWMP

7.3        Stormwater Quality Management

A stormwater quality assessment has been undertaken in accordance with the Urban Stormwater Quality Planning
Guidelines (2010), the Water by Design framework, and the State Planning Policy. The assessment demonstrates
compliance with applicable pollutant load reduction targets through the incorporation of an engineered treatment
solution.

A proprietary cartridge-based filtration system will be integrated within the OSD tank to provide treatment through
filtration and pollutant capture. The system is expected to achieve compliant reductions in sediments, nutrients,
and gross pollutants, ensuring no adverse impact on downstream receiving environments.


7.4        Erosion and Sediment Control

Erosion and sediment control measures will be implemented during construction in accordance with the IECA Best
Practice Guidelines (2008) and the Environmental Protection Act 1994. An ESCP will be prepared as part of the
Operational Works stage to manage construction-phase impacts.


7.5        Regulatory Compliance and Sustainable Outcomes

The proposed stormwater management measures comply with the requirements of Noosa Shire Council, QUDM
and State Planning Policy guidance, ensuring:

      •   No adverse impact on surrounding properties or downstream drainage systems

      •   Effective attenuation of peak flows through the proposed detention tank

      •   Improved stormwater quality outcomes through best-practice measures

      •   A hydraulically neutral post-development condition

Overall, the stormwater management strategy demonstrates that the development can proceed without adverse
stormwater impacts and with appropriate safeguards for downstream water quality and flood behaviour. The
SWMP supports the development application by confirming that stormwater has been appropriately assessed and
managed in accordance with recognised engineering and environmental standards.


7.6        Final Recommendations

To support the effective implementation and long-term operation of the proposed stormwater management
system, the following recommendations are made:

      •   Final detailed engineering design should verify the detention tank, outlet structure and internal pipe
          network to ensure compliance with QUDM and Council requirements for all relevant design storm events.

      •   Routine inspection and maintenance of the detention tank, including removal of sediment build-up, and
          inspection of the outlet structure, should be undertaken to maintain system performance over time.

      •   Post-construction review of the stormwater infrastructure should be completed to confirm that as-
          constructed conditions match the approved design and that the system is performing in accordance with
          Council standards.

By implementing these recommendations, the development will maintain effective stormwater performance,
ensure protection of downstream




 45 MAPLE STREET, COOROY
                                        24 June 2026                                               P a g e | 20
 Stormwater Management Plan
 Client Reference: P0478-26-001
 Prepared for Myall Rise PTY LTD