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Developed by NOAQ Flood Protection AB

The NOAQ Tubewall is a mobile freestanding flood barrier, intended for temporary use to protect buildings and other objects from flood water. It consists of air inflated tubes that are interconnected to form a protective chain - a tubewall. It is self-anchored, as it is automatically stabilized by the weight of the flood water itself.

TRL9. System ready for full scale deployment
Actual system proven in operational environment (competitive manufacturing). The solution is used successfully in a structurally operational environment. The user can and wants to recommend the solution to others. The NOAQ Tubewall has been tested both outdoors and in a hydraulic laboratory. It has shown to be stable and has performed well. It has been available on the market for more than 15 years and has been used successfully to save property in real floods in different countries.

See more information about this level and the TRL and SRL levels.

The main components of the system have been tested separately, and an initial integration exercise has been conducted.

Credits
Collaborators

How does it work?

The tubewall sections, the “tubes”, have a skirt fused along the flood side of it. This is pressed against the ground by the flood water, hereby anchoring the device. A drainage layer on the underside leads leak water out to the intended dry side, hereby reducing water pressure underneath to a minimum, which is required to avoid any uplift forces on the skirt. The tubes are connected to one another, in any angle, with a separate joint cover.

Limitations/conditions under which this innovation does not work or is less effective

As with all temporary barriers it should not be used on ground that is prone to erosion.

Added value
Using the weight of the water for anchoring the tubewall, the device itself does not need to be heavy. This has allowed us to use air inside the tubes to get the needed damming height. A 75 cm high and 10 m long tube section is inflated in 3 minutes, using a hand held blower. An inflated tube is still very light and can be carried by hand to another location. Afterwards the air can be sucked out as fast by reversing the blower, and the device can be packed together without the need of drying out the inside.

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