Tonkin Consulting

Port Adelaide River Dock [CC]

City of Port Adelaide

Port Adelaide River Dock [CC]

City of Port Adelaide

Seawater Stormwater Flood Risk Study

Port Adelaide

Some parts of Port Adelaide are low-lying and are susceptible to inundation from high tides.  Exacerbating this problem is the global issue of sea level rise, and locally reported land subsidence. The vulnerability of land around the Port River (from Gillman to the LeFevre Peninsula) during peak tide events, rainfall and combinations of the two was the focus of the study.

Tonkin Consulting led a team including Jensen Planning + Design and Eco Management Services to undertake a study into the existing and future requirements for protective infrastructure adjacent to the Port Adelaide River. The impact of sea level rise was a major consideration of the study

The study was an extension of earlier work undertaken by Tonkin Consulting in 2005 (‘Port Adelaide Seawater and Stormwater Flooding Study’) which investigated flooding and modelled the impact of stormwater, high tide, and sea level rise. The focus of this study was on investigating the condition and elevation of existing sea defence infrastructure and developed concepts for potential future upgrades and priorities. It is anticipated that in the short term the report will be used as a supporting document for planning authorities when assessing protective measures for new developments and to identify high risk areas. The long-term aim of the study to inform a further climate adaptation study to in turn may be used to upgrade State and Local development policy to incorporate protective infrastructure.

Tonkin Consulting undertook detailed site investigations. The structural condition of the existing sea defence infrastructure was assessed from the water and on land where possible. A digital terrain model was used to assess the existing elevation of the infrastructure and whether it was sufficient to protect against flood waters with predicted sea level rise. State-of-the-art 2D hydrodynamic modelling simulated the inundation patterns of both peak tide events and extreme rainfall events

The report recommended a suitable wall alignment and type for a number of segments that form the length of thewithin the study area. As part of these recommendations, advice on possible staging of works based on risk and condition was included.

Eco Management Services produced an environmental assessment of the proposed protection methodology. A number of areas were highlighted as possible locations for trial areas for more environmentally sustainable treatments.

Jensen Planning + Design considered planning implications of the proposed infrastructure and suggested future amendments to the Development Plan.

This work was jointly funded by the City of Port Adelaide and State and Commonwealth governments.

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