RFI - Engineering Response · MCU26/0001

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         Revised Civil Design Drawings included in Appendix A. The existing gully pit
         surround and lids are proposed to be replaced in accordance with Noosa Shire
         Council Standard Drawing 9223A and previous gully pit 2/1 has been removed
         / deleted.

EXISTING INFRASTRUCTURE

    •    Items 7-9 – Existing Stormwater Infrastructure

         The existing Council stormwater line located along the western side of the
         property has been identified from available Council records and considered in
         the proposed development layout. This alignment is indicative only and needs
         to be confirmed through locator services during the construction phase.

         The intent of the development is to retain and protect the existing stormwater
         infrastructure in its current alignment. Detailed structural design, footing design
         and temporary works associated with the basement construction will be
         undertaken by the project structural engineer.

         The structural engineer will be required to demonstrate that the development
         does not impose additional loading on the stormwater asset and that the
         proposed footings and excavation works are appropriately designed relative to
         the zone of influence of the existing infrastructure. Required protection and
         support of the infrastructure will need to be designed and certified by the
         structural engineer in accordance with QDC MP1.4 and relevant engineering
         standards.

         If deemed appropriate through the delivery of the work, the stormwater line may
         need to be replaced on the existing alignment.

         The proposed development maintains an open-to-sky setback adjacent to the
         western boundary to preserve future access to the stormwater infrastructure for
         inspection, maintenance and potential replacement works. Accordingly, the
         development is intended to maintain the ongoing function and maintainability of
         the Council asset.


RAINWATER RETENTION

    •    Item 10 – Rainwater Storage for Non-Potable Reuse

         A single 3,000L rainwater tank is proposed for the development, to be use for
         non-potable purposes, being predominantly the irrigation of the on-site
         landscaped areas.

         Compliance is demonstrated against Performance Outcome PO2, which
         requires that development "maximises water efficiency on site by incorporating



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         rainwater collection and reuse measures for non-potable purposes such as
         irrigation".

         To demonstrate that the proposed 3,000L tank maximises water efficiency on
         site, a Water Balance Model has been prepared for the development. The model
         assesses the capture of rainwater from a 242m² roof catchment and its reuse
         for irrigation of 158m² of landscaped area at an irrigation rate of 548 mm/year,
         using historical daily rainfall data for the Noosa locality (Bureau of Meteorology
         Station 040908).




     The Water Balance Model demonstrates that the single 3000L tank meets 93% of
     the irrigation demand in the 2023 design year (based on historical data) and 80%
     of the irrigation demand across the assessed 10-year rainfall record. In accordance
     with SC6.7 PSP6 This confirms that the tank is appropriately sized to the available
     roof catchment and the intended non-potable reuse, and that it is highly effective
     in capturing and reusing rainwater on site. Given the limited roof catchment area
     available, a larger combined storage volume would yield only marginal additional
     reuse relative to the increase in tank size.

     On this basis, the proposed 3,000L rainwater tank is considered to maximise water
     efficiency on site and to satisfy Performance Outcome PO2 of the Sustainable
     Building Design Code and has been implemented into the architectural design.


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     The hydraulic consultant will be responsible for the design and implementation of
     the tank, with overflow connected to the stormwater drainage system.

ACCESS

    •    Item 11 – Footpath / Driveway Grade

    Items have been addressed - refer to amended Civil Engineering drawings included
    in Appendix A. The location of the existing footpath (immediately behind the kerb)
    is non-standard and arguably is used for bin collection rather than a pedestrian
    thoroughfare. Regardless, to achieve compliance for the frontage of the proposed
    development, a new footpath is proposed on a standard alignment which crosses
    the driveway crossover maintaining a maximum 2.5% crossfall. Temporary infill
    triangles of concrete are proposed to taper the footpath back to the existing
    alignment on both sides of the development, thus allowing future direct connection
    as each adjoining property if developed.

PARKING

    •    Item 11 – Forward Gear Manoeuvring

    Items have been addressed - refer to amended Civil Engineering drawings included
    in Appendix A. The architectural design proposes the use of a vehicle turntable,
    which will be designed and documented by others. Utilising this, vehicle swept path
    assessments have been undertaken to demonstrate that the vehicle can enter and
    leave the site in a forward gear for all parking spaces in accordance with the
    AS2890.1.


Should you have any queries with respect to the above, please contact the
undersigned.


Yours Sincerely,




TIM BURKE
RPEQ (25245)

For and on behalf of:
BARLOW SHELLEY PTY LTD




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