Response to Information Request - Received on 19/04/2012 · OPW11/0335

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               6.1.4       Existing Heath Wetland

              The existing wet heath wetland is to act as a buffer to the Noosa National Park. The
              Wetland System provides an ecological buffer to pest flora entering the Noosa National
              Park.


    6.2        Proposed Treatment Train

              This sub-section describes the proposed treatment train for stormwater management
              associated with the    operating phase of the developed site. The development is
              proposed to be completed in 3 stages.     Specific stormwater control will be instated for
              Stage 1 only, with the remainder of the stormwater devices being installed at Stage 2 for
              both the Stage 2 and Stage 3 development.


              The treatment units include Rainwater Tanks, Vegetation Buffers, Bioretention Trenches
              and include the environmental buffering provided by the existing Heath Wetland system
              for assimilation of stormwater into the                                               receiving environment.   The treatment train
              sequence is shown in Appendix B as follows:


               6.2.1       Stage 1     -  Southern Section (Only)


              Southern Section


              1.     Direction of flow from the Commercial area (restaurant roof, tank) into Bio-retention
                                                                                           ’

                     C1a.
              2.     Dire~tion of flow from the offsite commercial area, ar-park and on-site commercial
                     area   (restaurant podium) into Bio’::~tention C1a
              3.     Direction of sheet flow from th~ ~outhern catchment (the "South balance@ into Bio-
                     retention C1 b;                                                 ...



              4.     Direction of flow from shacks (ro s, tanks) into Bio-retention C1 b;
              5.     Direction of flow from bio-retention C1a to bio-retention C1b;
              6.     Direction of flow from Bio-retentio~ C 1 b into Heath Wetland;
              7.     Capture of sheet-fow from the northern and mid catchments using a Swale or catch
                     drain, directed to Bio-retention"C1b                                                 .il


                                                                                                            t’
                                                              _,p~_i""’..._
                                                                              ,-   _.~_""~.......,.,.,,!;,,,i;t~!
               6.2.2       Stage 2 & 3

              Northern Section


              1.     Direction of flow from the North balance into the Bio-retention A 1;
              2.     Direction of flow from the roof and rainwater tank of Building A into Bio-retention A 1;
              3.     Direction of flow from shacks (roofs,tanks) in the north section into Bio-retention A 1;
                     and
              4.     Direction of flow from the Bio-retention A 1 north trench into the Heath Wetland


              Mid section


              1.     Direction of flow from the Mid balance into the Bio-retention B 1;
              2.     Direction of flow from the roof and rainwater tank of Building B into Bio-retention B1;
              3.     Direction of flow from shacks (roofs,tanks) in the mid section into Bio-retention B1.
              4.     Direction of flow from the Bio-retention B1 mid trench into the Heath Wetland;


              Stormwater that has passed through all these treatment units enters the receiving node
              (Appendix B).          The design stormwater quality passing through the treatment units, as
              well   as    into the receiving node, for each stage of development, was modelled                                                     using
              MUSIC Version 4.




    @2012 Simmonds & Bristow Pty Ltd                                    Contrast Constructions                               J-1 005-310   22 March 2012
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