12332_Council_Information Response_081118

Good Shepard Lutheran College                                                                          Odyssey Consulting Group
Proposed Car Park                                                                         Council Information Request Response
Lot 30 on SP170751                                                                                            Project No: K4277
115 EUMUNDI NOOSA ROAD, NOOSAVILLE

Response:
The MUSIC modelling has been revised to better represent the proposed design. It is proposed to direct all stormwater
flows north west towards Noosa Eumundi Road where flows will be captured by kerb and channel along north western
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boundary of the carpark. The majority stormwater flows from catchment A (A1) will pass over 69m of permeable
pavement before entering the bioretention / detention basin. Flows from catchment A (A2) that do not pass over the
permeable pavement will be directed straight into the bioretention basin. For further details see Knobel Consulting Pty
Ltd, Stormwater Management Plan (Ref: K4277/P007/B).

ITEM 12
Information Required
Demonstrate that the drainage features underlying any pervious paving is consistent with the requirement of The
Water by Design Music Modelling Guidelines.

Response:
Permeable pavement has been proposed in select areas to ensure the development best utilises the available space
while retaining existing established trees. As required by Water By Design Music Modelling guidelines, the permeable
pavement must be free draining, in lieu of geotechnical testing to confirm the hydraulic conductivity of the surrounding
soil, perforated pipe has been proposed. A permeable membrane will also be provided to allow stormwater to
permeate through the surrounding soils for the existing root systems. A section has been included to detail the
permeable pavement, for further details see Knobel Consulting Pty Ltd, Conceptual Stormwater management Plan (Ref:
K4277-0002-A).


ITEM 13
Information Required
Also, provide a copy of the MUSIC model, prepared in accordance with the Water by Design MUSIC modelling
Guidelines, that demonstrates the required pollution reduction targets are achieved.

Response:
Please see attached MUSIC model.

ITEM 14
Issue
Specific Outcome O8 of the Water Sensitive Design Code requires that the Development design including density and
scale provides adequate footprint to integrate all elements of stormwater quality and quantity treatment infrastructure
including, where relevant, bio retention basin batters and maintenance access, without the need for retaining walls.
The incorporation of the detention component with the bioretention water quality treatment component has resulted
in retaining walls that do not meet Specific Outcome O8. Additionally, it is not clear how the bioretention basin will be
accessed for maintenance purposes.

Information Required
Demonstrate that there is no alternative to the proposed design for incorporation of the above ground incorporation of
the detention component with the bio retention basin in the format that requires retaining wall surrounds and
demonstrate that adequate access is provided for maintenance. Consider alternatives such as provision of water quality
treatment components throughout the car park landscaping and undergrounding detention components to maximise
the space available.

Response:
Retaining walls have been utilised for the bio retention / detention basin to reduce the overall area taken up by the
detention basin and maximise tree retention and carparking. The proposed bio retention / detention basin will also be
situated on private property and shall be maintained by the Proponent at all times, not Council, for this reason
retaining walls have been proposed.


K4277-0005-A                                         2 November 2018                                                Page 2 of 3