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One of the most important infrastructure in an urban area is its stormwater drainage system, which is used to convey the excess rainfall from the surface of the urban catchment to the natural watercourse. Conventionally, these structures are required to perform properly under the selected and generated events known as Design Rainfalls which have been statistically calculated using the recorded rainfall from the past. These events include the intensity and duration for the design rainfalls with different return periods or frequencies and are assumed to demonstrate the pattern and frequency of the previous rainfall events. This stationary assumption is currently questioned due to climate change. It is expected that high intensity rainfall events would be more severe and frequent. This in turn would lead to frequent flash floods as the urban stormwater drainage system would not be able to cope with the increased intensity of the storm events. In Australia, the maintenance of the urban stormwater drainage system is the responsibility of local councils. With increase in rainfall intensities due to climate change, it is essential to assess the capability of existing drainage systems in handling these extreme events. With this aim, this research attempts to implement future scenarios of climate change for an urban catchment in Melbourne using a hydraulic model. The initial step in developing the hydraulic model included the extraction and correction of drainage system data from the GIS data available with the local council. The hydraulic model was calibrated and validated using captured flow data from the catchment. Different scenarios for future climate change were developed and a scenario representing the future change is applied to the model and the results are presented in this paper. The results are expected to assess the capability of the drainage system to cope with the future climate change. The future scenario used design rainfalls of 6 hrs duration and return periods of 50 and 100 years, which were extracted from the IFD curves obtained from the Bureau of Meteorology web site. These design rainfalls were increased by factors of 10%, 20% and 30% and the impacts of these increased rainfall events on the drainage system were assessed. The impacts were especially addressed using three important functional parameters of the drainage system under each scenario. These parameters were:

Implementing future climate change scenarios using a stormwater drainage model for an urban catchment in Melbourne