natural connected prosperous
2016 Coastal Hazard Risk Management and Adaptation Plan
The purpose of the CHRMAP is to provide strategic guidance on management and adaptation in areas potentially exposed to coastal processes, specifically sea level rise and storm erosion. The plan focuses on seven study areas, including Gracetown, Prevelly, Gnarabup, Hamelin Bay, Molloy Island, Augusta North and Augusta South and follows the process outlined in the State Coastal Planning Policy of risk identification, risk analysis and risk evaluation. A series of maps were prepared for each location, and risk categories developed as follows:
The limited topographic and geotechnical data available means the analysis of inundation and influence of coastal processes (particularly along limestone cliffs) is limited to a very broad scale assessment. As a result, a conservative approach has been adopted. The intended outcome is to prioritise investment for further assessment and monitoring in these areas.
2017 Limestone Cliff Stability Assessment report
A Limestone Cliff Stability Assessment was prepared in 2017. The study was to provides a better understanding of how limestone cliffs will react to coastal processes i.e. from sea level rise, storm surges, wind, waves etc and to assess and manage the risk to recreational users and assets in close proximity to the coast. The assessment covers Gracetown, Prevelly and Gnarabup, and is based on a 100 year planning timeframe with a notional 0.9 m of sea level rise.
A key outcome of the assessment was to refine hazard mapping identified in CHRMAP. The maps detail lower and upper extent hazard mapping with blue lines representing recreational users and red lines representing Shire assets. The lower extent of hazard lines defines the seaward side that may be impacted from rockfall collapse, while the upper extent shows the landward extent of the zone considered hazardous to Shire assets due to cliff regression over a 100-year period.
A copy of the Limestone Cliff Stability Assessment mapping can be found here, and the full copy of the Limestone Cliff Stability Assessment Report can be found here
2019 Limestone Stability Report
Following the 2017 risk assessment, modifications were made to stairs at Gracetown and Surfers Point, and additional signage installed throughout the Shire. In 2019, further investigations were undertaken at Gracetown, Surfers Point and Gnarabup. This resulted in 4 key actions being recommended:
Since late 2019, the Shire has implemented works at Gracetown, Gnarabup, Surfers Point and Riflebutts. It is expected to undertake a full review of coastal risk at all Shire managed locations in late 2021.
For more information on this work, please contact the Landcare and Environment Team at the Shire on (08) 9780 5255.
PO Box 61
Margaret River WA 6285
41 Wallcliffe Road
Monday to Friday
Ph 08 9780 5255
Fax 08 9757 2512
66 Allnut Terrace
Tues, Wed, Thurs
Ph 08 9780 5255
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