3.2 Temporary Flood mitigation methods

Hi Sam,

Great question. Let’s unpack this.

A new network of sea walls was constructed in 2017 to mitigate the impacts of tidal inundation on Saibai Island. This “permanent” system alone is not enough.

Under Design Area 5 – Climate change adaptation, students are able to develop designs for a variety of permanent systems under 5.2 Coastal erosion protection and 5.3 Nature-based coastal protection.

Given the risk profile, temporary flood mitigation systems would complement, but not replace permanent systems. Temporary systems provide flexibility and would be useful for use in targeted locations, and should ideally be easy to store, maintain, transport and deploy when needed. Together, both temporary and permanent systems provide layers of protection against inundation.

Hope this helps. Please let us know if you have any other questions.

Cheers,
Anthony

Hi Nick,

Thank you for your patience. TSIRC have confirmed that all three of AECOM’s recommendations were funded and have been implemented in the last ten years.

That includes the recommendations for Saibai from the INUNDATION MANAGEMENT ON SAIBAI, BOIGU AND IAMA ISLANDS Drainage and Seawalls (2012) which were:

• Replace the existing seawall with either a Seabee or rock seawall that incorporates a wave return wall with a crest height at 3.1m AHD. These works are estimated to cost approximately $11,000,000 or $11,300,000, depending on whether Seabee or rock armour is selected.
• Provide protection against inundation from the wetlands at the rear of the community by upgrading drainage and constructing a bun wall with a crest at 2.5mAHD. These works will cost approximately $7,900,000.
• Construct a 1m high reinforced concrete wave return wall around the Cemetery to improve inundation immunity at a cost of approximately $590,000.

Cheers,
Anthony

• This reply was modified 1 week, 4 days ago by Anthony Brady.