The Gurungaty Waterway is located 3.5km north of Port Kembla and flows from north to south into Tom Thumb Lagoon. The catchment area for this waterway is approximately 7.3 square kilometres. Gurungaty Causeway runs east/west across Gurungaty Waterway and previously served as an access road. Council advised that there is no current or future requirement for the causeway to provide any kind of vehicular access across the waterway.

The proposed flood mitigation option of lowering the Causeway from 1.3m AHD to 0.7m AHD was investigated and modelled to assess its viability to be adopted and implemented. The impacts of lowering the Causeway to this extent were investigated against the objectives set out by WCC in their technical brief. The following report addresses hydrologic, hydraulic, geomorphological, ecological impacts to deliver a concept civil design to mitigate flooding impacts within the Waterway.