RFI - Attachment 5 - Amended Stormwater Management Plan · MCU22/0094

 31 March 2023



4         SITE DATA
Site data has been obtained from the following sources of information:
      •   Survey Data
      •   Noosa Shire Council (NSC)
      •   Satellite imagery
      •   Relevant reports
      •   Dial Before You Dig (DBYD).


5         STORMWATER
5.1       Flooding

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

5.2       Lawful Point of Discharge

The lawful point of discharge for the development site is the Noosa Civic subdivision stormwater
network, South-West of the site within the future access road corridor. The existing Noosa Civic
lawful point of discharge is the Creek to the South of the site, off Eenie Creek.

5.3       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.

5.4       Operational Phase

5.4.1 Proposed Site Drainage

Stormwater runoff from the proposed development will be collected and conveyed in a new
stormwater pit and pipe network to the proposed Noosa Civic stormwater network.

Stormwater runoff from the new roof, carpark and landscaped areas will be directed to a
bioretention basin for stormwater quality treatment. High flow bypasses will be constructed
around the bioretention basins for flows exceeding the treatment flows.


 Excellence with Economy in Engineering                                                              7
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