Appendix D- SWMP

 29 September 2023



4         STORMWATER
4.1       Flooding

Based on Noosa Shire Council flood mapping, the site is not subject to flooding from any sources in
a major flood event.

4.2       Lawful Point of Discharge

The lawful point of discharge for the development site is the existing internal Noosa Civic Shopping
Centre stormwater infrastructure south east of the proposed Stage 2 retail development and the
existing stormwater drainage system Drive. The existing Noosa Civic Shopping Centre lawful point
of discharge is the creek to the south of the site.

4.3       Rainwater Reuse

Rainwater harvesting will be included on site to provide water for landscape watering and internal
fixture use. The harvesting system will collect runoff from the new roof area with overflows directed
to the bioretention basin for treatment.

4.4       Site Based Stormwater Management Plan

The aim of the Stormwater Management Plan outlined below is to:

      •   Prevent or minimise adverse social or environmental impacts from stormwater runoff
          originating from the proposed development.
      •   Achieve acceptable levels of stormwater runoff quality and quantity.

The Stormwater Management Plan aims to identify Stormwater Quantity and Quality Best
Management Practice for the site and demonstrate that water quantity and quality impacts will be
minimised in receiving waters.

The Stormwater Management Plan outlines the site in two sections, the operational phase and the
construction phase. The operational phase addresses treatment of contaminated runoff from the
developed site by natural methods before discharging into receiving waters whilst the construction
phase of the Stormwater Management Plan addresses erosion and sediment control to prevent
contamination of water sources by stormwater runoff during construction of the site.


4.5       Operational Phase

4.5.1 Proposed Site Drainage

Stormwater runoff from the proposed development will be collected and conveyed in a new
stormwater pit and pipe network prior to discharge to the existing internal infrastructure.

Stormwater runoff from the new roof and car park areas will be directed to a series of bioretention
basins for stormwater quality treatment. The site catchments will be split with a new stormwater
pipe network along both the northern and southern extents of the basement.




 Excellence with Economy in Engineering                                                                 8
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