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The default values adopted for MUSIC are based on calibration of the model to typical urban catchments (further guidance is available in the Appendices). It should be noted that the volume of runoff generated and the stormwater runoff time series from an urban catchment are not very sensitive to variation in the parameters defining the pervious area response to rainfall, except where directly connected imperviousness percentages are low, and the model is significantly more sensitive to the accurate definition of the fraction imperviousness and the selection of simulation time-step.

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Figure 1. Conceptual Rainfall-Runoff Model adopted for MUSIC (after Chiew & McMahon, 1997)

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Gross pollutant load generation was adapted from field monitoring data of Allison et al. (1997) for 12 storm events in an inner city suburb as shown in Figure 6.

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Figure 2. Derived "world data" probability plots for TSS (redrawn from Duncan, 1999)

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Figure 3. Suspended Solids Concentrations vs. Land-use (redrawn from Duncan, 1999)

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Figure 4. Total Phosphorus Concentrations vs Land-use (redrawn from Duncan, 1999)

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Figure 5. Total Nitrogen Concentrations vs Land-use (redrawn from Duncan, 1999)

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Figure 6. Relationship for the generation of Gross Pollutants in Urban Catchments (adapted from Allison et al., 1998).