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The City is seeking to assess the condition of Coombabah Lake and surrounding estuary against projected changes in climate, rising sea levels, changing weather patterns and runoff from the upper catchment.
Coombabah Lake and surrounding estuary is part of the Moreton Bay Marine Park and is a declared Fish Habitat Area. The Coombabah wetland system is classified as a wetland of international significance under the Ramsar Convention. This wetland system is home to a variety of key fish species, migratory birds, ecosystems, and marine and freshwater plants.
Rising sea level may change the depth and extend of the lake and estuary, which in turn will affect the extent and composition of the intertidal ecosystems and wetland values.
The following investigations have commenced:
In late 2020 the Department of Environment and Science deployed several tidal gauges in the lake and estuary and surveyed the topography of the lake. Data will be observed for 12 months and used to identify historical changes in hydrology dynamics.
The Department of Environment and Science is surveying the wetland to identify changes in vegetation patterns and its relationship to changes in tidal levels. This survey commenced in May 2021.
In June 2021 the City will assess the sediment source, pollutants and biological health of Coombabah Lake and estuary. The results will be compared to previous studies undertaken approximately 20 years ago.
Assessing the area will bring many benefits:
This project supports advancing climate science action under the Queensland Climate Adaptation Strategy (Q-CAS) and is aligned with the Biodiversity and Ecosystems Climate Adaptation Plan for Queensland.
Coombabah Catchment aerial view