2014-06-17 Planning & Organisation Committee Agenda

PLANNING & ORGANISATION COMMITTEE MEETING AGENDA                                  17 JUNE 2014


             (iii)   analytical justification that demonstrates design flows can enter any
                     proposed underground drainage system under appropriate blockage
                     conditions.
             (iv)    potential effects of flows in excess of the design flow including the
                     consequences of the Probable Maximum Flood.
             (v)     allowances made in the design for debris blockages of the inlet.
             (vi)    potential effects of debris blockages in excess of that allowed for in the
                     design.
             (vii)   an easement for drainage purposes to be registered against the title of the
                     property in favour of Council over the land and drainage system which
                     conveys external flows through the site. The easement must be granted at
                     no cost to council.
      (e)    the use of gravity stormwater drainage and not surcharge pits.
      *(Refer to Advisory Note)
Stormwater Quality Management
36.   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 section 5 of the of the Site Based Stormwater
             Management Plan listed in this Decision Notice.
      (b)    bioretention devices which:
             (i)     are designed generally in accordance with IPWEQA Standard Drawing No.
                     WSUD-001.
             (ii)    incorporate a coarse sediment forebay (in addition to the required filter
                     media surface area), which is sized in accordance with the latest version of
                     the Water Sensitive Urban Design Technical Design Guidelines for South
                     East Queensland and designed generally in accordance with IPWEQA
                     Standard Drawing No. WSUD-005.
             (iii)   have safe, unobstructed and all weather access from the road frontage for
                     maintenance purposes, particularly for the coarse sediment forebay.
             (iv)    are provided with a high flow bypass to ensure that flows which exceed the
                     treatment capacity of the device are bypassed in order to avoid damaging
                     of the filter media or subjecting the filter media to excessive sediment
                     loads.
             (v)     are provided with a free-draining outlet from the sub-soil drainage system.
             (vi)    treat stormwater from all developed catchments (including roof and carpark
                     catchments) prior to discharge.
37.   Permanent educational signage must be erected to educate the customers to 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. *(Refer to Advisory Note)




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