Flood-proof Moveable Buildings

 Flood-proof Moveable Buildings

There is a confluence of problems relating to housing:

• A warming world brings more rain, and recent experience suggests that it might come in fewer heavier events. And people like to live near rivers and lakes and in fertile valeys. 

• People also like to live near the ocean, but some places are prone to tsunamis, and no coast is immune. And rising sea levels are increasing the flooding danger from storm surges.

• So we have desirable locations, some with current service infrastructure, where conventional housing can no longer be insured, which is required for obtaining a mortgage.

• Meanwhile jobs come and go at different places as new economic activity arises and declines.

• There is also increasing awareness that rivers should not be corralled as much as they have been, but should be allowed to change course and to flood. There is a need to fit human occupation in with the natural life of the river.

Homes that float seem like an expensive solution, but maybe not.

Let's start with the simplest version: the mobile home. By this I mean something like a very large caravan. To make it floatable we put the door, and all openable windows, well above the water line when floating, while also making them well sealed when closed. We don't moor it like a houseboat. Instead we constrain it with poles firmly embedded in the ground on four sides so that it floats up and down in the same place.

Relative to a normal house of the same size this is intrinsically more expensive. However there is a big advantage in that it can be manufactured in a factory. It can be transported by truck, but another big advantage is that it can be towed by water to, or close to, its destination.

Indeed for houses that are going to be transported to their destination entirely by water they need not be constrained to be narrow enough for trucking. This might be particularly suitable for housing in man-made marinas as well as on river banks.

Where larger homes are required but transport by truck is needed, then they can be constructed in 2 or more parts, designed to be bolted and welded together.

Attachment of services to the home can almost all be done above the water line. The exception is waste water, which normally has to flow away under gravity. There are pumping solutions which will allow that connection to be above the water line. Alternatively there needs to be a seal that will very firmly and reliably and automatically close when flooding raises the house.

Moveable housing such as this allows for flexibility when a river changes course after a flood. The owner whose land has disappeared can be automatically allocated land where the river used to run. There will be the problem of new services, but since this will be a fairly rare occurence it can be covered by insurance.