Stormwater management plan 20220156 9 Kauri St SWMP

     3. Stockpiles for soils and materials are to be protect using bunded banks to divert upstream flows, and with
        downstream sediment fencing to prevent sediments being lost from the stockpile area

     4. Diversion of upstream catchments around any exposed areas using diversion drains around the site.

     5. Disturbed areas are to be stabilised through turfing or hydromulching as soon as practicable once
        earthworks are complete.


     4.2. Operational Phase
In accordance with the Noosa Plan 2020 Water Quality and Drainage Code, the proposed development site will be
required to achieve the design objectives for operational stormwater quality as outlined in Table 9.4.8.3 PO6, as
shown in Table 4.1 - Operational Water Quality Objectives below.


                                            Table 4.1 - Operational Water Quality Objectives

                                                  Pollutant                      Percentage Reduction
                                                                                      Target (%)

                                    Total Suspended Solids (kg/yr)                         80

                                        Total Phosphorus (kg/yr)                           60

                                          Total Nitrogen (kg/yr)                           45

                                         Gross Pollutants (kg/yr)                          90


MUSIC modelling has been carried out to assess the proposed development treatment train against these
objectives as described in the following section.


          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 Modelling
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 20220156
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