2017-01-16 General Committee Agenda

GENERAL COMMITTEE MEETING AGENDA                                               16 JANUARY 2017


   28.   Any temporary drainage works to manage stormwater flows during the construction
         phase of development must be designed by the supervising RPEQ to provide a 150mm
         freeboard and convey the following flow capacities without resulting in visible scour
         within flow paths:
         a.    1 in 2 year event where disturbed area open for less than 12 months
         b.    1 in 5 year event where disturbed area open for 12-24 months
         c.    1 in 10-year ARI event where disturbed area open for 24 months
         d.    Minimum 1 in 1 year ARI Hydraulic capacity for temporary culvert crossings
   29.   E&SC measures must be installed and maintained to ensure any waters discharged
         from the site up to and including a 85%ile 5 day rain event (or 46mm rainfall
         event) contain less than 50mg Total Suspended Solids per litre. All relevant measures
         detailed in the International Erosion and Sediment Control Book 2008 or Sunshine
         Coast Manual for Erosion and Sediment Control must be installed to minimise the
         amount of sediment leaving the site in rainfall events that exceed 85%ile 5 day or
         46mm.
   30.   Peak 1-year ARI event discharge from the construction phase of development must be
         equivalent to the pre-development peak 1-year ARI event discharge. Measures
         included in calculations to achieve management of peak flows must be incorporated
         into the development in a manner that is consistent with the Noosa Plan, all conditions
         of the approval and does not interfere with adjoining properties.
   31.   Prior to the completion of the development, all site surfaces must be effectively
         stabilised. For the purpose of this condition, an effectively stabilised surface is defined
         as one that does not, or is not likely to result in visible evidence of soil loss caused by
         sheet, rill or gully erosion or lead to sedimentation, or lead to water contamination.
         Water Sensitive Design
   32.   All hardstand areas must drain to a bioretention basin with active filter media area sized
         to be 2.2% of the contributing catchment. Active filter media area is the area of the
         bioretention basin surface that is not covered by any impermeable structure such as a
         sediment forebay, inlet pipe riser, etc.
   33.   Amended drawings must be provided to Council for approval prior to arranging a pre-
         start meeting. The amended stormwater drawings must:
         a.    demonstrate that each catchment on site drains to a bio retention basin sized to
               2.2% of the catchment area. The bioretention basins must be constructed in
               accordance with those drawings.
         b.    demonstrate that appropriate detention is provided to not increase peak flow
               runoff from the site in a Q1, 5, 50 and 100 year event. The appropriate detention
               infrastructure must be installed in accordance with those drawings.
   34.   Prior to the commencement of use, the supervising RPEQ must certify that all
         hardstand areas of the development drain to necessary detention tanks as well as a
         bioretention device designed and constructed in accordance with all relevant
         conditions of this approval, the Water by Design Bioretention Technical Design
         Guidelines, relevant aspects of the IPWEAQ Standard Drawing WSUD-drawing series
         and Construction and Establishment Guidelines: Swales, Bioretention Systems and
         Wetlands (Water by Design, 2009).




                                                                                   Page 37 of 146