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An amphibious floating building as response to river floodings in Lismore Australia. ICAADE
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Climate change will lead to more frequent and bigger more impactful climate extremes, resulting in a higher death toll and economical losses. Lismore (Australia) is a small city located in a flood-basin where two rivers merge. As it has a historical flood record, its city centre is protected by a levee of 10.5m and the lower suburbs have raised Queenslander stilt-homes. However, in 2021 the levee was overtopped twice, with one peak of 14.4m resulting in the inundation of 3,000 homes, of which many were flooded up to the ceiling of the second floor. Observations concluded that flood-damage is caused by: 1. muddy water inundating building materials and inventory; 2. pressure from strong current; 3. impact from debris floating and crawling along the current; 4. looting, and; 5. Human harm.
Lismore Council, the Northern Rivers Reconstruction Corporation and the Resilient Homes program from the state-government are working on flood-safe solutions, including relocating the community. Amphibious buildings currently receive little consideration, therefore this paper applies ‘research by design’ to test if this option is worth more consideration.
A design was made comprising three floors standing on ground level, that can float up during a flood as protection from inundation. The floors use two heavy sidewalls as mooring columns along it can slide 11m upwards, which is sufficient for a one-in-a-hundred-year flood for a site of at least 5m above river level. These sidewalls also shield the floors from strong current and floating debris. The floors rest on some concrete pedestal that holds a semi-submerged and sloped parking garage. This pedestal protects from crawling debris and prevents debris from getting stuck below the floors after the flood. These, and other flood-protection elements are integrated with daily functionalities, which makes it arguably more functional and economical than considered alternatives. The design was widely covered in conventional and social media, sparking debate with many proponents from the Lismore community. No structural calculations have been made for this design, although this is likely only to affect the thickness and rebar of the sidewalls. Limitations are regulations, insurance industry, and codification barriers.
Bart van Bueren
Roslyn Prinsley
Usha Iyer-Raniga
Lismore Council, the Northern Rivers Reconstruction Corporation and the Resilient Homes program from the state-government are working on flood-safe solutions, including relocating the community. Amphibious buildings currently receive little consideration, therefore this paper applies ‘research by design’ to test if this option is worth more consideration.
A design was made comprising three floors standing on ground level, that can float up during a flood as protection from inundation. The floors use two heavy sidewalls as mooring columns along it can slide 11m upwards, which is sufficient for a one-in-a-hundred-year flood for a site of at least 5m above river level. These sidewalls also shield the floors from strong current and floating debris. The floors rest on some concrete pedestal that holds a semi-submerged and sloped parking garage. This pedestal protects from crawling debris and prevents debris from getting stuck below the floors after the flood. These, and other flood-protection elements are integrated with daily functionalities, which makes it arguably more functional and economical than considered alternatives. The design was widely covered in conventional and social media, sparking debate with many proponents from the Lismore community. No structural calculations have been made for this design, although this is likely only to affect the thickness and rebar of the sidewalls. Limitations are regulations, insurance industry, and codification barriers.
Bart van Bueren
Roslyn Prinsley
Usha Iyer-Raniga