Dutch to fight flooding with 'amphibious homes'

Ought Six

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An interesting idea for those who live on a flood plain or wetland area. It should not be too difficult or expensive to make up a floating base for a home (and even the home itself) with some pressure-treated wood, chicken wire and shotcrete.

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Dutch houses to float in floods


By Anthony Deutsch
Associated Press, via The Washington Times
June 06, 2004

MAASBOMMEL, Netherlands — This low-lying land has a new weapon in its battle with the tides: amphibious houses.

For centuries, the Dutch have built dikes to protect themselves from the sea. Now, with predictions of more frequent flooding caused by climate change, they are looking for ways to live with water, not fight it.

That change of thinking is reflected in a new housing project — a community of amphibious homes — in this central Dutch village about 60 miles southeast of Amsterdam.

Unlike the houseboats that line many Dutch canals or the floating villages of Asia, the several dozen homes are being built on solid ground, but they also are designed to float on floodwater.

Each house is made of lightweight wood, and the concrete base is hollow, giving it shiplike buoyancy.

With no foundations anchored in the earth, the structure rests on the ground and is fastened to 15-foot-long mooring posts with sliding rings, allowing it to float upward if the river floods. All the electrical cables, water and sewage flow through flexible pipes inside the mooring piles.

The 700-square-foot structures are on the "wrong" side of a dike in a beautiful flood plain of one of the country's main waterways, the Maas River, overlooking lush marshland and a harbor.

That design addresses another constant fight in the Netherlands — finding space for housing in Europe's most densely populated country, said Chris Zevenbergen of Dura Vermeer, the company behind the project. He said floating houses could help make up the 40 percent shortfall in land suitable for development over the next 50 years.

At a starting price of 260,000 euros (about $310,000) for a house with three small bedrooms, the homes are at the high end of the market for a village such as Maasbommel — but many have been sold, and the first residents are moving in.

"They are pretty much just regular houses," said builder Hans van de Beek. "The only difference is that when the water rises, they rise."

So, during times of high water, people will need a boat to get from the dike where they park their car to their floating home.

For more than 1,000 years, the Dutch have been holding back the sea, and even reclaiming it. Landfills and windmill-driven pumps have created vast fields, called polders, for new cities, pastures and cropland. If it weren't for its system of dikes and canals, as much as half of the Netherlands could be submerged.
 

Ought Six

Membership Revoked
You can eliminate the need for bilge pumps in shotcrete pontoons by filling them with foam. Commonly available spray two-part insulation foam should work perfectly; it does not cost too much; and you can rent the spray equipment. Just make a large form with segemented, open-top compartments, lay in chicken wire attached to pressure-treated wood structural beams, shotcrete it, then after it cures spray the cavities full of foam. After that, you would just need to trim the foam flush and deck it over with pressure-treated plywood held down with stainless screws and construction adhesive. You would also need some kind of impact-resistant fender material around the outer edge to deal with flood debris.

That should make a very strong floating base for a home, if you engineer it properly. I would think that a large geodesic dome design would be a good choice for building on such a platform. It would not catch the wind like a flat-sided house; it would be structurally far stronger and lighter than a regular stick-built design; and it would have a lower center of gravity, which is a good thing for anything that floats.
 

Gingergirl

Veteran Member
Since there is no need for a through hull propeller shaft, I guess it really would be water proof.

Begining to sound like a 21st century Noah's Ark.
 

Ought Six

Membership Revoked
In Alaska 'floating camps' for logging and other work are commonly built on large rafts. The rafts can be over 100' long, and are moved from place to place as needed. They have one- or two-story buildings on them with bunkhouses, kitchens, dining halls, rec rooms, machine shops, storage buildings, etc. They even have cranes to launch workboats and lift them for hull maintenece. They move these big rafts around with just a couple outboard motors.

So you could actually build a house designed not just to float in a flood, but to be a mobile, waterborne home that you could move at will.
 
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