20210153 - Maple Street SWMP

     2. Sediment fencing along downstream of the work areas within the site to prevent sediment
        from leaving the construction area.

     3. A shakedown area is to be installed at the construction entry/exit to the proposed
        development area to minimise sediment being transported to and from the site.

     4. Ensuring any stockpiles and construction materials are contained using sediment fencing
        downstream of these areas.

     5. Downstream pits within the property to be protected through filter socks or similar.

     6. Diversion of upstream catchments around any exposed areas through the use of turfed catch
        drains or similar.


     4.2. Operational Phase
The development is to comply with the Noosa Council Water Quality and Drainage Code, AO6.2
which states:

“All stormwater runoff is treated to achieve maximum removal of nutrients, gross pollutants and
suspended solids as determined by cost to efficiency ratios. (e.g., bioretention basins must be sized
to achieve at least 80% reduction in total suspended solids, 60% reduction in total phosphorous, 45%
reduction in total nitrogen and 90% reduction in gross pollutants >5mm).”

It is proposed that the following measures to be implemented will provide the required level of
stormwater quality improvement to minimise impacts to the downstream network:

     •    First-flush divertors will be installed for roof-water drainage to divert initial run-off capture
          to irrigation of the vegetated areas on site.
     •    An OSD area providing 50kL of detention storage will connected to collect roof run-off
          from the proposed unit buildings to reduce peak flows from the development to existing
          levels.
     •    Ecosol litter baskets with 1.5mm mesh (or similar) are to be provided to pits within the
          driveway to provide primary filtration by preventing gross pollutants and litter from
          entering the stormwater network.
     •    A 22m² bioretention area will be used to treat stormwater run-off from the newly developed
          area prior to discharge from the site.



          4.2.1 MUSIC Modelling
The proposed development and the above treatment train have been modelled in MUSIC (Model
for Urban Stormwater Improvement Conceptualisation) software in accordance with the Water by
Design MUSIC Guidelines 2018.

The climatic data has been modelled using the rainfall and PET data at station 40059 (Cooroy
Composite) in 6-minute timesteps. The rainfall run-off parameters have been set as defined for the
Southeast Queensland region, shown below in Figure 4.2 - Rainfall run-off parameters for SEQ.




Project number 20210153
File RECOR Preliminary Stormwater Management Report - 20210153.docx, 2022-03-31                                 Page 14 of 26
Revision 0

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