Attachment 3 - Stormwater Management Plan 1856-SBSMP-01 v5 (December 2019) · RAL18/0023

4.0 STORMWATER QUALITY MANAGEMENT

This Site Based Stormwater Management Plan includes Stormwater Quality Management
guidelines for the construction phase of the development. The development will implement
stormwater quality management for construction and operational phases as per Qld SPP
(2017), Council’s PSP, and the Water Sensitive Urban Design (WSUD) Technical Manual
by Healthy Waterways. The efficiency of the Stormwater Quality Improvement Devices
(SQID’s) during operational phase have been assessed with a MUSIC model as outlined in
Section 4.3 of this report. Refer to the Stormwater Management Layout in Appendix A
showing the catchment boundaries and treatment nodes proposed for the development.


The proposed allotments remain vacant as part of the subdivision development. Given the
proposed use of the allotments, development of each lot would trigger a Material Change
of Use application. Each future development shall provide its own SQID's to satisfy
stormwater runoff pollutant removal targets for the specific lot. The SQID's modelled with
this report are to address stormwater runoff from the road reserves only.


This version of the Stormwater Quality Management Plan has been updated to include the
proposed bushfire access driveway and parking either side along the back of Lots 12-15.
These pavements will be introduced with the subdivision works so the stormwater
MUSIC model has been updated to include SQIDs to treat these impervious portions of the
lot only.


It is suggested, as discussed with Council representatives, that a property notation be
applied to these Lots (11-15) to clarify the function of this bioretention basin that would be
present at the rear of these lots. The property notation will also identify that lots with an area
less than 2,500m2 would also be required to provide stormwater quality treatment, whereas
the Qld SPP(2017) normally excludes a lot of this size from application of the design targets.
The proposed notation reads as follows:
        A stormwater quality management plan will be required as part of any
        submission to the Local Council. This management plan will address
        treatment of stormwater runoff from the proposed development footprint in
        accordance with the design pollutant removal targets in the Qld State
        Planning Policy (2017) and the Noosa Plan.
        <Additional wording for Lots 12-15>
        The bioretention basin at the rear of this lot is designed to treat the existing
        hardstand pavement area only, as provided with the greater subdivision
        works.


Site Based Stormwater Management Plan                                                 Page 4 of 22
1856-SBSMP-01_Version 5.0 (December 2019)