RFI - Appendix D- Stormwater Management Plan · MCU22/0140

                                                                                                             ingeniir

3.        DESIGN OBJECTIVES
The objective of this report is to demonstrate that the project can comply with the Noosa Shire Council’s
codes and policies in relation to stormwater management through the implementation of the following
objectives;

      •   Maintain stormwater quality in accordance with local and state policies
      •   Manage and Mitigate quantities of peak stormwater discharge
      •   Adopt Water Sensitive Urban Design (WSUD) principles throughout
      •   Stormwater Harvesting and re-use for landscaping and alternative uses
      •   Provide immunity and resilience from flooding

This report outlines the design requirements to achieve the above objectives in a site-specific context.


4.        STORMWATER STRATEGY
The site is situated between Opal Lane on the North and Ruby Street on the South. There is stormwater
infrastructure in Ruby Street across the frontage of the site with a field inlet approximately central to the
frontage; and it is proposed to discharge the Southern portion of the development into this field inlet.

Field inlet pits are proposed to the western boundary to assist in the redirection of flows between the
buildings. Currently the entire site (with the exception of the existing dwelling’s roof water) drain to the
Western boundary; the development proposes to redirect these flows to the road reserves on both frontages
of the site which will significantly improve and provide a benefit to the neighbours on the western side.

It is achievable to maintain acceptable flows to both Ruby Street and Opal Lane through the implementation
of on-site detention.

Above ground tanks will be utilised for the Northern portion of the site (Opal Lane Units) for detention and
retention purposes to maintain a small footprint and maximise deep planted landscaping available for the
development and provide gravity irrigation to landscaping on the site.

The Southern Portion of the site (Ruby Street Units) will utilise an underground rainwater tank for
stormwater mitigation located under the driveway that is proposed to discharge into the field inlet in front of
the site.


5.        STORMWATER QUALITY
5.1       Construction Phase

The State Planning Policy (DILGP, 2017) Appendix 2 – Stormwater management design objectives
Table A: Construction phase – stormwater management design objectives outlines construction phase
requirements for stormwater quality.

The following manuals (as a minimum) should be read and implemented by any contractor proceeding with
the development construction;

      •   State Planning Policy Appendix 2 Table A – available here

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