Permissible Change Decision Notice Approval or App in Part - 010.2006.00001168.002 [As Published] · 132006.1168.02

                                                                                       2006/1168



Stormwater Drainage
25.   Roof runoff from the new building shall be directed to a rainwater storage system or tank
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      (minimum storage 12 litres/m of roof area) that is installed to ensure water from the tank can
      be used for external uses (such as watering gardens, irrigation, ornamental ponds, water
      features, outdoor cleaning, etc) and for use in flushing of toilets internal to the building. All
      rainwater tanks are to be designed and installed in accordance with the Queensland
      Development Code (QDC), Part 25 – Rainwater Tanks, and shall be part of the plumbing
      application in conjunction with the building approval. The location and capacity of the tanks
      shall be clearly shown on the plans submitted for Building Works approval and any overflow
      shall be directed to the proposed stormwater system.
26.   As the site is proposed to be filled, appropriate stormwater drainage pipes shall be installed
      within the site to collect and discharge stormwater runoff from all adjoining properties to
      prevent additional ponding/flooding on these properties.
27.   Stormwater runoff from pervious areas of the site must be directed to bioretention basins and
      infiltration systems designed in accordance with the requirements of The Girraween
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      Stormwater Management Plan Version 2, 22 December 2006 by Ecological Engineering and
      generally in accordance with Drawing 12106 C007 by GHD dated 24 July 2010 except as
      modified herein and including the annotations marked on the stamped approved drawing,
      including:
      a.    Rock scour protection must be provided at the outlet of all stormwater pipes and is to
            comply with the requirements of Appendix A of the publication “Stormwater Outlets in
            Parks and Waterways” by Brisbane City Council, 2003.
      b.    The bioretention basin must be landscaped at a density of 8 plants per square meter.
            The planting pallet must consist of at lease three species pursuant to Appendix A of
            WSUD Technical Design Guidelines and The Noosa Plan - Planning Scheme Policy 3
            Landscaping Plants and Guidelines.
      c.    The ramp access to the bioretention basin must be relocated to an alternative location
            so that the floor of the bioretention basin can be accessed by a Pozi Track for
            maintenance. The relocated access ramp must be all weather access and not reduce
            the size of the footprint of the floor of the bioretention basin to what is shown on
            Drawing 12106 C007 by GHD dated 24 July 2010.
      d.    The filter material and landscaping of the bioretention system must be undertaken
            following completion of construction of all areas that drain to the bioretention basin.
      e.    Soils within the infiltration swale must have a minimum hydraulic conductivity of
            1000mm/hr.
      f.    Bioretention signoff forms contained in the Water By Design Construction and
            Establishment Guidelines for Swales, Bioretention Systems and Wetlands must be
            completed and signed off by the registered Professional Engineer supervising
            construction of the system.
      27.1 An inground stormwater infiltration device or 0% grade infiltration swale sized and
           certified by an RPEQ and vegetated with dunal vegetation must be provided at the
           outlet of the stormwater system located between the junior and senior soccer field as
           shown on Drawing 12106 C004 by GHD dated 24 July 2010.
      27.2 A landscape buffer with a minimum width of 5m must be planted between the grassed
           areas of the site and adjoining retained native vegetation. Plant spacing’s within this
           landscaped buffer must be as follows:
                 Trees 2m apart
                 Larger shrubs 1m apart
                 Groundcovers 0.5 - 1m apart
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