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            Mose Venice

            Louvers for Flood barrier Compressors in Venice

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            The historical city of Venice has had to contend with floods for years. In the 20th century, flood water levels have been occurring at an increasingly rapid succession. The cause is not only the rising sea levels, but the subsidence of the city into the unstable subsoil as well. To prevent further floods, flood barriers are being constructed to close off the Venice lagoon from high tides.

            Who hasn’t seen them? The photos of the flooded San Marco square in Venice. With the completion of the MOSE project this has become a thing of the past since 2015. In 2003, then Prime Minister Silvio Berlusconi gave this project its official go-ahead. It is Italy’s largest post-war construction project. The construction was preceded by tens of years of preparation, and involved the use of Dutch expertise, including Delft University of Technology, among others.
            The MOSE floodbarrier system comprises a total of 78 mobile barriers distributed across the lagoon’s three inlets. Normally, the flap gates are filled with water and rest in their concrete caissons at the bottom of the sea. By filling them with air they are rotated to rise up from the bottom. In their retaining position, they form an angle of approximately 60 degrees with the sea bottom. The system will only be activated in case of extremely high tides and is sometimes compared to the Thames Barrier in London and the Maeslantkering storm surge barrier in the Netherlands.

            Ventilation for Noisy Compressors
            In the event of extremely high tides, the compressors fill the hollow flap gates with air. The air is supplied via Merford type AKR acoustic louvers and Ducowall wall louvers for the walls of the compressor halls. Because the compressor buildings are located close to the sea, it is even more important for these facilities to have high corrosion resistance. Merford consequently manufactured the AKR louvers using seawater-resistant aluminium. Delivery took place in close cooperation with the Italian contractor’s Project Manager. "We completed the job at Chioggia. The AKR product is very much appreciated! Thank you for your support,” said the satisfied Project Manager Stefano Silimbano.

            For more information about the MOSE Project visit