The Stormwater Management Plan (SMP) is designed to substantially reduce the number of properties within the catchment that would be affected by very large flood events, including a 100 Year ARI flood.
A 100 Year ARI flood is a flood that will occur on average once every 100 years, and has a 1 in 100 (1%) chance of occurring in any given year. It is the most commonly applied standard in Australia for providing an acceptable level of flood protection for the community.
The SMP, approved by the Stormwater Management Authority in February 2017, details construction of a number of flood mitigation works across the catchment, as well as non-infrastructure measures to help reduce the impact of major flooding for more than 2,000 properties in a one in 100-year storm event.
The SMP also identifies important environmental and community benefits, including:
- Improved quality of stormwater discharge into marine receiving waters;
- Beneficial re-use of stormwater, particularly for greening of urban open space areas;
- Creek rehabilitation and protection of biodiversity; and
- Improved recreational amenity in open space areas traversed by watercourses.
The works present urban renewal opportunities such that communities will be able to better use the land corridors through which stormwater is designed to be conveyed (i.e. linear parks, bike and walking trails, and wetlands).