Amphibious Buildings

Accommodate
Written By Frank Hangler

Amphibious architecture is an adaptation strategy where structures are designed to adapt to flooding. In this way, a structure is less susceptible to inundation. Some amphibious buildings are built on elevated foundations. Other buildings are constructed on foundations that under normal circumstances rest firmly on a solid surface. However, during periods of flooding, the building floats. Amphibious buildings with the capacity to float are supported by a buoyancy system that allows the base of a building to move as the water level changes. Therefore, amphibious architecture is ideally suited to flood-prone regions with natural cycles of flooding.[^3]

Types of amphibious building

  • Dry roof structures prevent water from entering a building during a flood. These structures incorporate internal or external flood protection barriers [^7]
  • Wet roof structures allow floodwaters to flow into and remain in a building during a flood and flow out of the building when the floodwater begins to subside. Wet roof structures are constructed with materials that can withstand flood damage. Hence, wet roof structures are designed to mimic natural landscapes such as floodplains [^7]
  • Permanent static elevations are structures that are permanently elevated as an adaptation measure to flooding. They are usually located in areas where flooding occurs regularly [^6]
  • Buoyant foundations allow a building to sit on a regular foundation during dry weather but float during a flood. Buoyancy foundations consist of three basic elements, buoyancy blocks that allow the building to float, vertical guideposts that control the movement of the structure up and down, and a subframe that holds the platform and building together [^4] [^5]

✓ Benefits

  • Increases the value of real estate because of flood adaptation design
  • Adaptable to variation in flood water levels [^5]
  • Reduces the level of damage due to flooding
  • Amenable to soil subsistence and changes in sea level rise [^6]

✗ Challenges

  • Increases the cost for access to services such as sewage disposal, water supply, power, and gas, when compared to non-amphibious buildings [^5]
  • Static elevated buildings are more vulnerable to the wind because elevation increases the effects of high wind speed on the building.
  • Insurance companies may be reluctant to provide adequate coverage due to the increased risk of flood damage.
  • Municipalities may be hesitant to issue permission for development approval

Example projects

Citations

<! data-preserve-html-node="true"-- Regular citations --> [^1]: “FLOAT House.” Morphopedia, https://www.morphosis.com/architecture/126/. [^2]: Ibid. [^3]: English, E., Klink, N., & Turner, S. (2016). Thriving with water: Developments in amphibious architecture in North America. In E3S Web of Conferences (Vol. 7, p. 13009). EDP Sciences. Retrieved from, https://buoyantfoundation.org/wp-content/uploads/2017/04/FloodRisk_2016_ECEnglish_finalpaper.pdf [^4]: English, E. (2009, November). Amphibious foundations and the buoyant foundation project: Innovative strategies for flood-resilient housing. In International Conference on Urban Flood Management sponsored by UNESCO-IHP and COST Action C (Vol. 22, pp. 25-27). https://www.researchgate.net/figure/The-FLOAT-House-New-Orleans-Elevation-interior-guide-post-and-sleeve-detail_fig6_322675610
[^5]: Climate Adapt. Floating and amphibious housing (2015).https://climate-adapt.eea.europa.eu/metadata/adaptation-options/floating-and-amphibious-housing/#ao_category [^6]: Land8: Landscape Architects Network (2015). What is Amphibious Architecture and How Will it Help Cities Adapt to Climate Change? https://land8.com/what-is-amphibious-architecture-and-how-will-it-help-cities-adapt-to-climate-change/ [^7]: Nilubon, P., Veerbeek, W., & Zevenbergen, C. (2016). Amphibious architecture and design: a catalyst of opportunistic adaptation? –case study Bangkok. Procedia-Social and Behavioral Sciences, 216, 470-480.

<! data-preserve-html-node="true"-- Images --> [^i1]: Figure 1. English et al. (2016). Thriving with water: Developments in amphibious architecture in north America. https://www.e3s-conferences.org/articles/e3sconf/pdf/2016/02/e3sconf_flood2016_13009.pdf [^i2]: Figure 2. Brears. R. (n.d). A Floating House to Resist the Floods of Climate Change .https://youngwaterleaders.thewaternetwork.com/article-FfV/a-floating-house-to-resist-the-floods-of-climate-change-zY8sRnPTmd2aqpyJrvinig [^i3]: Figure 3. Morphosis Team. (2009). FLOAT House. https://www.morphosis.com/architecture/126/. [^i4]: Figure 4. Mangione, K. (2019). Figure 4. Noticed the blue cabin floating in False Creek? Here's what it is. https://bc.ctvnews.ca/noticed-the-blue-cabin-floating-in-false-creek-here-s-what-it-is-1.4565356

Frank Hangler
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