ABSTRACT
The Nepean River rises in the southern highlands of New South Wales, traversing in north east direction, becomes the Hawkesbury River and flows to the sea on the east coast of Australia. A flood risk management strategy was prepared for a study area of 140 km2, vulnerable to flooding and subject to development pressure, located in the lower part of Upper Nepean River Catchment. 1D/2D TUFLOW hydrodynamic and RAFTS hydrologic models were used to assess the flood behaviour. The 10% and 20% increases in 1% Annual Exceedance Probability rainfall intensity would increase the flood depths up to 1.5 m and 2.5 m respectively in the study area. An economic analysis and climate change impact analysis based on climate change projections for Australia was undertaken to assess the feasibility of floodplain development that considered climate change and effective planning controls.
