Acqua alta

Acqua alta? / I ( Italian, high water ' ) is the winter and annually recurring floods in Venice. It occurs when an especially strong tide and low air pressure, the Scirocco, the water pushes inland in the lagoon of Venice and lasts because depending on the tide, only a few hours each. In normal tide the water level rises up to 90 cm above the normal level; when it rises higher, " Acqua alta ".

At 100 cm above normal the actual water level is at the lowest point of the city ( Piazza San Marco ) is about 20 cm. The record water level of 194 cm set on November 4, 1966, almost all of Venice under water. To the around November is the culmination of the " Acqua alta, " season, such floods can occur but is typically from September through to April.

In the 60 years the risk was exacerbated by the fact that was dropped by several inches fairly quickly through groundwater extraction Venice. This has now stopped and by structural measures has to get the flood better grip. In recent years, however, has increased ( according to some opinions, as a result of climate change ), the number of recognizable " Acque old".

Since December 2007, the siren system, which has warned of flooding, has been replaced by a differentiated signal system. Here, depending on the anticipated water level can be heard several times a siren of the eight sirens in the city. With a height of 110 cm above normal you hear a single tone at 120 in addition to a higher, at 130 with two respectively higher and at 140 cm with three each higher tones.

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Acqua alta is also the title of a playing in Venice filmed detective novel by Donna Leon.

Next is " Acqua alta " is the name of the annually held International Trade Fair for flood control, climate impacts and disaster management. They first took place in 2003 at the Munich Exhibition Centre, where he was aligned in 2005. In 2006 she moved to the CCH - Congress Center Hamburg and found again in 2008 instead. You will be in the future 2-year exchange with the alpine version of Acqua alta alpina, aligned, the first held in Salzburg in 2007. As of November 2014, the trade fair is organized in the future in food. There is also a Acqua alta in Singapore, which has coastal protection in the tsunami areas on the subject.

Since December 15, 2007, a club aqua alta stands up for flood protection on Lake Biel. This as a result of the devastating floods in the years 2005 and 2007.

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