Sealed Judgement

4.1.2           Pollutant export parameters

Table 4-2 nominates the pollutant export parameters adopted for the purposes of modelling:

x     Pre-development scenario: Forest land use parameters were used to model the vegetated
      portion of the Site, while the Urban Residential land use was used to model a small portion of
      the external sealed road.

x     Post-development scenario: the Forest land use parameters were adopted for the ground
      portion of the Site that will be retained undeveloped and the suspended walkways, while the
      Urban Residential land use was used for the roof and carpark areas.

Table 4-2      Pollutant Export Parameters

    Land Use            Flow      TSS Log10 Values       TP Log10 Values         TN Log10 Values
                        Type
                                   Mean      St. Dev     Mean       St. Dev      Mean       St. Dev

    Forest           Base Flow      0.51       0.28       -1.79      0.28        -0.59        0.22

                     Stormflow      1.90       0.20       -1.10      0.22       -0.075        0.24

    Urban Roof       Base Flow      N/A        N/A         N/A        N/A         N/A          N/A

                     Stormflow      1.30       0.39       -0.89      0.31         0.26        0.23

    Urban Road       Base Flow      1.00       0.34       -0.97      0.31         0.20        0.20

                     Stormflow      2.43       0.39       -0.30      0.31         0.26        0.23



4.2             Catchment Properties
Table 4-3 and Table 4-4 present the properties of catchments modelled under the pre-development
and                  post-development                    scenarios                  respectively.




Figure 4-1 shows the post-development MUSIC catchment plan.

Table 4-3      Pre-development Catchment Properties



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