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Flip-Flap cofferdam

The Flip-Flap dam is designed for urban areas prone to river flooding. In case of a flood threat the height of the levee can be increased up to the safety standard. The Flip-Flap Dam offers a solution for at least two situations: 1) when there is insufficient space to further increase the height and widen the base of the levee, and 2) to retain spatial quality and keep the physical barrier between river and city as small as possible.

Developed by Spectrum Construct SRL
Flip-Flap Cofferdam is designed to prevent floods in urban areas. It can be used as boardwalk (walkway) around the clock. When flood emergency arises it is raised in vertical position and locked into the concrete gutter. In this position it acts just like a regular flood protection wall. Material is PVC sheet piles.

TRL6. Prototype system verified
Technology demonstrated in relevant environment. Representative model or prototype system, which is well beyond that of TRL 5, is tested in a relevant environment. Represents a major step up in a technology’s demonstrated readiness. Examples include testing a prototype in a high-fidelity laboratory environment or in a simulated operational environment. Prototype will undergo testing in Flood Proof Romania in 2017-2018.

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.

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How does it work?

When flood warning is in effect, a team of maximum four people will go to the site with minimum tools (wrenches). They will take out the PVC panels that lay horizontally and mount them vertically in the foundation gutter. After the wall is in vertical position there will be, at certain distance, galvanized steel pipes fasten to the steel infrastructure in the gutter. On top of the wall there will be mounted “U” shaped profiles that will be fasten, by thread, to the pipes, sealing the bottom of the wall to the base of the gutter through a rubber gasket that is laid there.

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

  • – very simple infrastructure
  • – wall is always at location, doesn’t need storage and transportation
  • – ready for installation immediately when flood danger is signaled
  • – no need for any special machinery/ tools to install
  • – no need for skilled labor
  • – can be installed at a very high speed

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