The components of the study are to:
- collate available historical flood related data;
- analyse historical rainfall and flooding data;
- undertake a community consultation program;
- develop robust computational hydrologic and hydraulic models and calibrate them against multiple historical events;
- undertake a flood frequency analysis based on the historical record
- determine the flood behaviour including design flood levels, velocities and flood extents within the catchments;
- to assess the sensitivity of flood behaviour to potential climate change effects such as increase in rainfall intensities
- to assess the floodplain categories in accordance with Council policy and undertake
provisional hazard mapping; and
- to determine and map the flood planning area in accordance with the floodplain
development manual
MODELLING SUMMARY
The study comprises two distinct modelling components:
- WBNM (Hydrologic) – The model was used to calculate the flow hydrographs for input into the TUFLOW model.
- TUFLOW (Hydraulic) – The 2D hydraulic model was used to assess the complex flow regimes of Paterson River and its tributaries and how these flows interact with the floodplain and levee system.