RFI - Attachment 4 - Updated Stormwater Management Plan

                                  STORMWATER MANAGEMENT PLAN
Client: Devcon Capital 9                                                  Location: 11 Leo Alley Road, Noosaville



5.0 CONCLUSION
It can be seen in the results presented in Tables 5 & 6 that the stormwater treatment measures
designed for the proposed industrial complex achieve the performance criteria for water quality set
by the NSC and by the SPP (2017). Annual load reductions of TSS, TP, TN and GP between the
mitigated and unmitigated MUSIC model scenarios have been met or exceeded.
The stormwater treatment measures for the proposed development were designed to achieve the
maximum cost/benefit ratio for the optimal hydraulic loading of the treatment measures. Water
Sensitive Urban Design (WSUD) measures have been proposed for the site and water quality
modelling has demonstrated that the effective treatment of key pollutants is possible.

Sufficient consideration of stormwater controls has been demonstrated by:

 •    Compliance with the requirements of Noosa Shire Council’s Load Based Reduction Objectives;
 •    Compliance with Queensland State Planning Policy (2017);
 •    Compliance with Urban Stormwater Quality Planning Guidelines (2010);
 •    Compliance with QUDM (2013); and,
 •    Compliance with the EPP (Water) 1997

Further, as the fraction impervious of the existing site is similar to that of the proposed development
there is a very minor increase in stormwater peak flows which is considered to be insignificant and
negligible. Further, the proposed bioretention basins will assist in mitigating stormwater peak flows
due to their extended stormwater detention depth. The proposed development will there have a non-
worsening effect on adjacent and surrounding properties.

This site, based on this SMP has demonstrated that efficient management of stormwater quality and
quantity is possible by the management strategies nominated for the proposed development.


6.0 REFERENCES
Healthy Waterways (2006), Water Sensitive Urban Design Technical Design Guidelines for South East
       Queensland, Brisbane

Department of State Development, Infrastructure and Planning (2017) State Planning Policy. Brisbane,
     Queensland.

Department of Environment and Resource Management (2010) Urban Stormwater Quality Planning
     Guidelines. Queensland, Australia.

Water by Design (2010) MUSIC Modelling Guidelines. SEQ Healthy Waterways Partnership. Brisbane,
     Queensland. IBSN 978-0-9806278-4-8.

CSIRO, 1999, Urban Stormwater: Best Practice Management Guidelines

Water by Design (2012), Bioretention Technical Design Guidelines (Version 1), Healthy Waterways Ltd,
    Brisbane.

Institute of Public Works Engineering Australia, Queensland Division Ltd (2013) Queensland Urban
        Drainage Manual, Third Edition.

Water by Design (2012), Maintaining Vegetated Stormwater Assets (Version 1), Healthy Waterways Ltd,
    Brisbane.



Covey Associates Pty Ltd                              7                                    Project No: 192297
Consulting Engineers                                                                         26719Rpt, Issue E