2022-06-16 Ordinary Meeting Agenda

ORDINARY MEETING AGENDA                                                              16 JUNE 2022


    42.   The site must be provided with a stormwater drainage system connecting to a lawful
          point of discharge. The works must be undertaken in accordance with an Operational
          Works approval and the Queensland Urban Drainage Manual, and must include in
          particular:
          a.   the detention system generally as described in Site Based Stormwater
               Management Plan, prepared by ADG, dated 28th October 2021;
          b.   provision for the extent of inundation outside of batters of bioretention devices to
               be confined to grassed areas only not to impact pathways, structures or the pool
               and associated infrastructure for any event up to and including the 1%AEP at year
               2100. A plan showing the extent of inundation and details of proposed signage for
               grassed areas subject to inundation are to be provided with the application for
               operational works;
          c.   extension of the site stormwater system to accommodate runoff from any external
               catchment areas which drain onto the subject site at the time of the operational
               works application being lodged. Any flowpath through the site which conveys
               external catchment flows is to be provided with a drainage easement in favour of
               the external property, with registration of the easement required prior to
               commencement of use;
          d.   the use of gravity stormwater drainage and not surcharge pits to the maximum
               extent practicable. Surcharge pits may only be used where the catchment is
               composed of roof surfaces only;
          e.   provision of rainwater tanks for the capture and reuse of roofwater for the irrigation
               of communal landscaping; and
          f.   accommodation for both severe storms or severe blockage of the underground
               drainage network. A Severe Storm/Severe Blockage Assessment for the drainage
               system proposed for the site is to be provided with the development application for
               operational works, and is to demonstrate that finished floor levels will not be
               inundated under either a severe blockage of the underground drainage network in
               the 1%AEP event at year 2100, or for a severe storm exceeding the 1%AEP based
               on design blockage.
          Stormwater Quality Management
    43.   A stormwater quality treatment system must be provided for the development. The works
          must be undertaken in accordance with an Operational Works approval and the latest
          version of the Water Sensitive Urban Design Technical Design Guidelines for South East
          Queensland, and must include in particular:
          a.   stormwater quality treatment devices of a size and location generally in accordance
               with those shown in Site Based Stormwater Management Plan, prepared by ADG,
               dated 28th October 2021;
          b.   bioretention devices which:
               i.     are designed generally in accordance with the Bioretention Technical Design
                      Guidelines (Water by Design, 2012)
               ii.    are designed generally in accordance with IPWEQA Standard Drawing No.
                      DS-073, DS-075, DS-076, and DS-078
               iii.   are provided with a free-draining outlet from the sub-soil drainage system
    44.   Permanent educational signage must be erected to educate the residents of the
          development about the function of the bioretention device(s). The dimensions, standard,
          presentation and location of the educational signage must be in accordance with an
          Operational Works approval.


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