Flip-Flap cofferdam

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.
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.
Testing plan completed
The testing plan and the BRIGAID’s Testing Innovation Framework (TIF) has been rightly applied and finished. The TRL of the innovation has been effectively reached.
Prototype will undergo testing in Flood Proof Romania in 2017-2018.

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.

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The OBREC device consists of a concrete top element, which can be installed in new or existing breakwater, e.g. during maintenance operations. It is provided with a sloping plate that conveys the overtopping waves inside a reservoir, which later flow in the rear chamber, where the turbines should be installed. The front reservoir captures the overtopping waves to produce electricity. The energy can be then extracted via low head turbines, which should be powered by a constant hydraulic head.
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.
Testing plan completed
The testing plan and the BRIGAID’s Testing Innovation Framework (TIF) has been rightly applied and finished. The TRL of the innovation has been effectively reached.
Many series of small scale lab tests in wave flume and tanks. Prototype installation (June 2016) of a 5 m wide OBREC in the port of Naples. The installation will include monitoring of nearshore waves, wave run-up, pressure on the structure, wave overtopping and power production.

How does it work?

OBREC is provided with a sloping plate that conveys the overtopping waves inside a reservoir, which later flow in the rear chamber, where the turbines should be installed. The front reservoir captures the overtopping waves to produce electricity. The principle is to use the difference in water levels between the reservoir and the mean sea water level. The energy can be then extracted via low head turbines, which should be powered by a constant hydraulic head. The OBREC cross section will be optimized in order to improve its performance, i.e. minimize the risk and increase the energy production in terms of discharges rates flowing inside the rear chamber.

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