SUPERSEDED Negotiated Decision Notice - 010.2007.00001841.001 [As Published] · 132007.1841

                                                                                        2007/1841



Roof Water & Stormwater Drainage
55.   Roof runoff from any new building shall be directed to a rainwater storage system or tank
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      (minimum storage the greater of 5000 litres or 15 litres/m of roof area) that is installed to
      ensure water from the tank is 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 / Operational Works
      approval and any overflow shall be directed to the stormwater drainage system.
56.   All stormwater drainage (including roof water overflow from the rainwater storage system) shall
      be collected and discharged so there is no net increase in stormwater runoff from the site.
      Stormwater drainage permitted to drain from the site shall be discharged to the adjoining open
      space area. Plans of the drainage design shall be prepared by a Registered Professional Civil
      Engineer and submitted to Council prior to obtaining a Development Permit for Operational
      Works. The drainage design shall be in accordance with Council’s Planning Scheme Policy
      PSP5 – Engineering Design Standards – Roads, Drainage and Earthworks and QUDM. All
      components (pits, pipes, tanks, basins, scour protection etc) of the stormwater drainage
      system shall be wholly contained within the boundaries of the subject site.
57.   As the surface levels of the site are to be altered, 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.
58.   To ensure that polluted run-off does not enter Council’s stormwater drainage system,
      stormwater run-off from the common driveway and carparking areas shall have the first flush
      (the first 12 mm of rainfall or hose-down) collected in a grease/oil arrestor/gross pollutant trap
      provided on site prior to being permitted to discharge into Council’s drainage system.
      All other clean stormwater, such as roof water, can be collected on site and discharged through
      a single underground drain line directly into the existing drainage system, bypassing the
      grease/oil arrestor/gross pollutant trap.

      To this end, a detailed maintenance plan shall be prepared for the proposed grease/oil
      arrestors/gross pollutant trap, which shall be submitted to the Council for approval prior to
      obtaining a Development Permit for Operational Works.

      The approved maintenance plan shall be incorporated in the ongoing maintenance scheme for
      the development and a copy of this shall be provided for Council’s records prior to
      commencement of the approved Use.

      A Development Permit for Building Works shall not be granted until a Development Permit for
      Operational Works has been issued in regard to the drainage scheme.
59.   The applicant shall revise the Stormwater Management Plan Parts A & B prepared by Barlow
      Gregg VDM reference M3048 dated December 2007 to use rainfall data for the subject site’s
      locality, Noosaville, and to detail a stormwater treatment train that can achieve the Water
      Quality Objectives for the site. This revised stormwater treatment train for the site shall ensure
      that nutrients can be adequately treated prior to release into the open space conservation
      areas. All stormwater runoff treatment must be undertaken within the development areas of the
      site. Water quality objectives for the site are as follows:
      59.1. Suspended Solids < 15/50mg/L (median)
      59.2. Total Nitrogen < 0.5mg/L (median)
      59.3. Total Phosphorous < 0.05mg/L (median)
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