2576 - SBSMP-01 (Feb 2026)

6.0 CONCLUSION

This stormwater management plan has assessed the proposed development with respect to
both stormwater quality and quantity. The catchment hydrology has been assessed to
ensure the development will not cause actionable nuisance, flooding, or degradation of
runoff quality, and that outcomes are consistent with the requirements of the Noosa Shire
Council Planning Scheme.


Based on this assessment, the following conclusions are made:


       A bioretention device with a total of 210m² of filter media is required to achieve
        water quality treatment targets.
       Hydrological modelling was undertaken in WBNM across a full range of design storm
        events, supported by Rational Method verification.
       The drainage strategy directs the majority of runoff to the southeast discharge point.
        This is consistent with the previous approval for this site.
       Increased post-development flows to LPOD1 are attenuated through a 472m³
        detention basin, ensuring the overall discharge from the site does not exceed pre-
        development levels.
       Council mapping has confirmed that the site is not subject to flood encumbrance.


In conclusion, while the peak flow rates and distribution of flows are altered, the overall post-
development discharges are managed such that they do not worsen existing conditions. The
proposed stormwater management system achieves compliance with Noosa Shire Council
requirements, meets water quality treatment targets, and ensures all stormwater is
discharged lawfully in accordance with QUDM (2016).




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