Town Planning Report - Lake Macdonald Drive, Cooroy (Coast2Bay) · MCU25/0118

REPORT

3.9.3         Sewer Infrastructure
As outlined in Section 5.2 of Arcos’ Engineering Report, a new sewer main and property branch to the lot is
being provided within the future adjacent road reserve by the surrounding subdivision. As such the existing
service shall be utilised by the development.

3.10          Stormwater Management
Reference is made to the Engineering Report prepared by Arcos provided at Appendix C of this report
which also includes a Stormwater Management Plan.
We understand the subject site will be delivered in accordance with council’s development application
reference OPW25/0057, which proposes to provide a stormwater outfall and water quality treatment for the
site. The minor storm event is defined as the 10% AEP storm plus climate change, with the major event
being the 1% AEP storm plus climate change.
Runoff from within the subject site is proposed to be captured by a proposed underground pipe drainage
network, and is to be conveyed to a future stormwater pit (provided by the surrounding subdivision), which
shall form the Legal Point of Discharge for the development.

3.10.1 Stormwater Quality
Stormwater quality is to be provided by a future bio-retention basin directly north of the subject site. The bio-
retention basin is to be built as a part of the surrounding subdivision works (refer OPW/25/0057) and has
been sized to cater for the fully developed catchment. As such, no additional stormwater quality is proposed
for the development.

3.10.2 Stormwater Quantity
As per the design for the surrounding subdivision (OPW/25/0057), we understand stormwater quantity
management is to be provided on a lot by lot basis. As such, on-site stormwater detention is proposed in the
form of an OSD Tank.
A DRAINS model will be developed prior to lodgement of a subsequent development application for
operational works that will nominate a specific OSD tank size and orifice arrangement capable of mitigating
developed peak flows across a range of AEP storm events back to existing levels.
For the purposes of this development application, an indicative tank size of 30kL is nominated for the
development based on a rate of 90kL per hectare (typically accepted value for urban catchments in South
East Queensland). All roof and hard stand areas will be directed to the tank for on site flow attenuation. An
additional 3kL of re-use capacity will be provided to service communal landscape areas.
In addition to OSD storage, an indicative minimum rainwater reuse volume of 3,000L is required for each
dwelling, in accordance with the Sustainable Building Desing Code. A water balance equation will be
completed prior to an OPW application to confirm the final volume to stormwater re-use for each dwelling.

3.11          Waste Servicing
Following discussions with Council officers during prelodgement engagement, we understand Council’s
Waste Team has acknowledged that a reverse manoeuvre is required for a waste collection vehicle to
service the proposed refuse bins on site. The ability to enter the site and service the bins from the proposed
waste store is illustrated by the Vehicle Tracking Plan prepared by Arcos provided at Appendix C.
Importantly, the location of the proposed bin store has been revised since prelodgement discussions, such
that it is now effectively screened from view from the streetscape via its placement within the under croft
parking area.




AU213016247 | Development Application for a Material Change of Use to establish a Multiple Dwelling (Affordable Rental Premises) comprising 25
dwellings | 1 | 29 September 2025
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