RPT_P0041116_Other Change - 7 Noosa Parade_V1_260511 · MCU25/0053.01

4 Supporting Information
The proposal involves interior changes to the layout of the basement level to introduce additional living
spaces and removal of one (1) x car parking space. As the proposed changes are located below ground level,
the design considers the relevant flood levels and mitigation measures to ensure the safety of occupants and
protection of property.

Accordingly, this proposal is supported by the following technical and specialist information:

▪     Appendix G – Dewatering Management Plan, prepared by ADG Consulting; and

▪     Appendix H – Civil Engineering Drawings, prepared by SCG Consulting

Of note, the abovementioned specialist reports were included in the existing approval (Council Ref:
MCU25/0053 and OPW25/0074) and are re-attached to this Other Change application, as the reports remain
applicable to the proposal.

A summary of the technical reports is provided in the sections below.


4.1 Flood Mitigation
As part of the existing development approval (Council Ref: MCU25/0053 and OPW25/0074), a Flood
Information Certificate was provided by Noosa Shire Council which specifies that the minimum floor level for
habitable rooms/areas on the site is 2.7m AHD for the defined flood event, being the 1% AEP under 2100
Climate Change Conditions.

The approved design of the dwelling house is designed in accordance with the requirements of the DFE for
the site and therefore complies with the prescribed outcomes of the Flood Hazard Overlay Code.

The proposed changes to the internal layout result in the introduction of living areas at basement level. The
existing development approval includes storage, wellness facilities, plant equipment and refuse areas at
basement level. The upgrade to the design, which improves the functionality of this level, includes the
introduction of a living space, wellness room and wine cellar. Of note, the plant, pool equipment and pump
system are all retained as part of the amended design.

Of significance, the proposal does not alter the existing Dewatering Plan (refer Appendix G), which has been
prepared by ADG Consulting in accordance with QUDM Section 7.2.3. The Stormwater Management Plans
contained in Appendix H illustrate that the basement-level pump system is retained to facilitate site
drainage. A secondary pump and backup power supply are also retained to manage stormwater in the event
of pump failure. The flood management strategy further includes a permanent automatic tilting barrier at the
basement entry, designed to withstand a 1:100 year flood event and deploy automatically when required. An
excerpt of the basement stormwater management plan is shown in Figure 13 below.

The proposal therefore does not alter the mitigation of flood hazards in a major storm event, and thus the
approved stormwater management arrangement remains adequate. Further details are provided in the Civil
Engineering Plans prepared by SCG Consulting (refer Appendix H) and the Dewatering Management Plan
prepared by ADG Consulting (refer to Appendix G).

The excavation works involve minimal alteration to the eastern subterranean wall. The changes are minor
and result in no changes to the Dewatering Management Plan that forms part of the existing approval and
ensure that the development is constructed to suitable mitigate water egress. The Civil Engineering drawings
have been updated to reflect the proposed change to the wall and pool areas. The proposed amendments to
the basement layout therefore do not impact the flood management and mitigation measures of the
approved development. Please refer to Appendix H for further details.




Other Change Application - 7 Noosa Parade                                                Supporting Information   24