RFI - Appendix C Civil Engineering Cover Letter by MPN Consulting · MCU21/0175

 20 December 2021


        Information Required
        5. Provide an updated SWMP and preliminary engineering plans, which achieve a higher level of
        landscape integration by minimising bioretention system surface set-down relative to surrounding areas
        and minimises retaining walls consistent with the allowances specified in the Bioretention Technical
        Design Guidelines (Water by Design, 2014). Greater consideration should be given to the use of at-source
        bioretention devices within the car parking areas.

Response:
Batters have been provided to the bioretention basins in accordance with the Bioretention Technical
Design Guidelines (Water by Design, 2014) where possible. The locations of the bioretention basins
were chosen to achieve greater efficiency. The use of at-source basins was reviewed and considered not
to be suitable for this development.

        Issue - Roof-water reuse
        Roof-water reuse

        Information Required
        6. Demonstrate how roof-water harvesting and reuse has been incorporated into the design consistent
        with PO2 and AO2.2 of the Sustainable Building Design Code. Water balance calculations should be
        provided to justify the size of any storages proposed, based on the yield generated from the roof areas
        and the anticipated demand from non- potable fixtures.

Response:
The proposed development includes minimal toilets and the landscaping has been designed to be self-
sufficient once established. Refer to the letter provided by Place Design Group regarding the landscape
works. Rainwater tanks are therefore, not considered to be required for the development due to
minimal potential use.


Should you require further information or clarification on any items within this request for information
response please contact the undersigned for assistance.

Yours faithfully




Sam Rowen
For and on behalf of
MPN CONSULTING PTY LIMITED
sr:dh




 Excellence with Economy in Engineering                                                                   2
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