Appendix D- SWMP

 29 September 2023


The existing car park will continue to drain to the remaining bioretention basins which will be
retained as part of the Stage 2 retail development.

The bioretention basins will be located to take direct downpipe discharge from the roof and car
park areas in order to ensure the basins are shallow when situated within the surrounding natural
ground.

Stormwater treatment will be implemented to remove sediments, nutrients, gross pollutants and
hydrocarbons in accordance with the requirements of Noosa Council and the State Planning Policy.

Stormwater discharged from site is proposed to be consistent with the existing retail development
discharge. The location of the new Stage 2 retail is over existing impervious area and as such will
not increase the sites percentage impervious or peak runoff volume.

The proposed conceptual stormwater drainage layout is depicted on MPN Plan 9954-DA03-06
attached in Appendix 2.


4.5.2 Stormwater Quantity Management Strategy

The proposed development site will connect into the existing drainage system for the Noosa Civic
Shopping Centre. The sites minor flows will run through the existing pipe system whilst the major
overflows will overland flow down the internal roads prior to discharging to the creek to the south
of the site in accordance with the overall Noosa Civic and Noosa Business Centre development.
There will be no impacts to external properties as a result of the development flows through the
internal site system.

The Stage 2 retail development is located over existing impervious areas and as such will not
increase the sites percentage impervious or peak runoff volumes. It is note proposed to include any
detention systems as part of the new retail.




 Excellence with Economy in Engineering                                                               9
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