Att 4 - SWMP · MCU21/0117

                                  Figure 3.1 – Existing stormwater network catchment

            The peak storm events for the development were modelled in 12D, with the catchment
            hydrology configured in accordance the Bureau of Meteorology’s IFD curves (increased by
            the climate change factor) for the locality and a minimum time of concentration of 5 minutes
            for each catchment. The model was run for the ensemble of storm events for storm durations
            up to 12 hours to simulate the pipe hydraulics under a range of different rainfall patterns.

            The developed site and the external catchments as described above that have been used
            in the modelling are shown below in Table 3.1-Development Catchment Areas.

                                         Table 3.1-Development Catchment Areas

                                    Catchment               Area (Ha)   Fraction Impervious

                                    C1                      0.017       100

                                    C2                      0.020       100

                                    C3                      0.028       100



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