An ‘amphimbious’ house designed by Baca Architects has been granted planning permission on an island site in the Thames in Marlow, Buckinghamshire. It will replace an existing bungalow on the site which lies in a designated Flood Zone 3b and in a Conservation Area.
Planning restrictions limited any increase in the building’s height, and flood risk policy did not allow for significant extension to the existing footprint.
The proposed house is set back from the river to create an 8m ecological buffer zone required by planning. A riverside terraced garden is designed to flood incrementally and acts as a flood-warning system. The lower level terraces will be planted with reeds, a higher level with flood-resistant shrubs and plants, and above will be the lawn. This layering of the garden is designed to manage run-off from the house as water subsides after flooding and reduce siltation of the dock.
The design of the house incorporates guideposts from marina design to create a free-floating pontoon. Techniker structural engineer Matthew Wells explains the floating design: ‘A lightweight timber superstructure is supported on a concrete base with sufficient ballast to ensure stability and adequate freeboard. The floating house is secured by four dolphins (permanent vertical posts) arranged close up to the sidewalls. The assembly is sited within a wet dock comprising retaining walls and base slab. When flooding occurs the dock fills with water and the house rises accordingly.’
Other features of the design include:
- high performance insulation
- external blinds
- heat recovery ventilation system
- solar panels.
The house is estimated to cost 20% to 25% more than a similarly sized conventional house.
Baca has supplied the following examples of ‘amphibious’ houses from around the world:
- Maasbommel in the Netherlands in 2005 by the DuraVermeer Group - 32 amphibious dwellings (and 14 floating homes) built on the side of a dyke using floating bases anchored to mooring posts. Designed to accommodate a water level difference of up to 5.5m.
- Competition win by DuraVeermer Group in collaboration with Baca Architects in 2008 in Dordrecht. 160 homes including larger buildings which could be designed to use an inhabited hull.
- Lower 9th District of New Orleans, part of Brad Pitt’s ‘Make it Right’ initiative.
- A prototype amphibious house for slum dwellers in Dhaka, Bangladesh.
Filed under: Eco-projects