Attachment C - Stormwater report

 4.            MUSIC Modelling
The Model for Urban Stormwater Improvement Conceptualisation (MUSIC) Version 6 was used in
combination with MUSIC Modelling Guidelines Version 1.0 (2010) to evaluate expected pollutant loads
Two models have been developed:

    1. Regional MUSIC Model – used to assess the likely pollutant loads generated within the catchment,
       and
    2. Site Specific MUSIC Model – used to assess the pollutant loads from the greenhouse roof area and
       the required treatment measures to achieve the South East Queensland water quality objectives.

4.1.         Rainfall Data
Stormwater runoff is simulated using historical rainfall data. Data from Nambour DPI, station number
40282, has been used from 1989 - 1998 to represent the climatic period which the MUSIC model is based. A
summary of the meteorological parameters used to simulate climate behaviour are presented in Table 1.
Table 1 - Meteorological and Rainfall Runoff Data.


Input                                                Data Used in Modelling

Rainfall station                                     40282 – Nambour DPI

Time step                                            6 minute

Modelling period                                     1/1/1989 -31/12/1998

Mean annual rainfall (mm)                            1,527

Annual evapotranspiration (mm)                       1,675

Rainfall runoff parameters                           Varies (refer Section 4.3.4 & Section 4.4.2)

Pollutant export parameters                          Varies (refer Section 4.3.4 & Section 4.4.2)
Rainfall runoff and pollutant export parameters included as model inputs are in line with the MUSIC
Modelling Guidelines Version 1.0 (2010).

4.2.         Evapotranspiration Data
Nambour DPI evapotranspiration data was extracted from Table 3.1 of the MUSIC Modelling Guidelines
Version 1.0 (2010), as detailed in Table 2.
Table 2 - MUSIC Monthly Evapotranspiration Data (mm).

   Jan        Feb        Mar        Apr        May           Jun      Jul       Aug       Sep       Oct   Nov   Dec

   204        166        169        125         89           76       78         93       121       168   187   199




Stormwater Management Plan – Lot 1 on SP108094, 305 Lake Macdonald Drive                                        Page 10

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