Catchment Modelling and Flood Risk Assessment: Powell Creek

This report focuses on the catchment modelling of Powell Creek, a tributary of the Parramatta River in Sydney, Australia. The study utilizes the Stormwater Management Model (SWMM) to simulate the creek's flow and assess flood risks. The methodology involves comparing the SWMM outputs with recorded data, including gauge heights and discharge rates, to calibrate the model. The analysis includes hydrograph comparisons, error analysis, and the calculation of parameters like RMSE and modeling efficiency. The results indicate that the initial SWMM output did not perfectly match the recorded data, but introducing a time delay improved the model's accuracy. The report concludes that while improvements are needed, the SWMM model provides valuable insights for understanding the catchment's hydrological behavior and flood risk assessment. The report also highlights the importance of accurate data input and the potential benefits of file-based data input over manual methods.