Appendix 4- SWMP

                                                                                                             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 approximately 140m from the low point/sag inlets within David Low Way (at
approximately Vernon Street) which discharges into a drainage reserve and then to the Pacific Ocean to the
East. There is stormwater infrastructure in David Low way approximately 140m North of the site however this
is deemed not required or suitable for direct connection as on site detention will be implemented to provide
acceptable kerb discharge rates in accordance with IPWEAQ RSD-201 (RS-081) of 25L/s in a 5% AEP event at
any singular location.

All properties on the Eastern side of Ventura Street are located below the Kerb and channel and flow towards
David Low Way. There are existing multiple dwelling developments immediately adjacent to the North of the
site which and two properties South which also maintain stormwater discharge into David Low Way.

Underground rainwater detention and retention will be provided by Garantia Li-Lo Rainwater Underground
Tanks (or similar tanks of equal storage volume) which will be located under the proposed outdoor area slabs
to maintain a small footprint and maximise deep planted landscaping available for the development and
provide rainwater irrigation to landscaping on the site, as well as hardstand wash down and pool top up.

The proposed roof water discharge to David Low Way is 17L/s for the 5% AEP design event which is well
below the acceptable discharge rate as per the IPWEAQ drawings for discharge to street via a kerb adapter.
Total site discharge rates are improved for all design events at the 5 minute duration which is the AS3500.3
design duration for roof water drainage.


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;



                                                Ingeniir Pty Ltd | 245001-SMP-01
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