Venice : Underwater From Rising Waters

Venice is a city in northeastern Italy and the capital of the Veneto region. It is situated on a group of 118 small islands  that are separated by canals and linked by over 400 bridges. The islands are located in the shallow Venetian Lagoon, an enclosed bay that lies between the mouths of the Po and the Piave rivers (more exactly between the Brenta and the Sile). In 2018, 260,897 people resided in the Comune di Venezia, of whom around 55,000 live in the historical city of Venice (centro storico). Together with Padua and Treviso, the city is included in the Padua-Treviso-Venice Metropolitan Area (PATREVE), which is considered a statistical metropolitan area, with a total population of 2.6 million. 

The name is derived from the ancient Veneti people who inhabited the region by the 10th century BC. The city was historically the capital of the Republic of Venice for a millennium and more, from 697 to 1797. It was a major financial and maritime power during the Middle Ages and Renaissance, and a staging area for the Crusades and the Battle of Lepanto, as well as an important center of commerce—especially silk, grain, and spice, and of art from the 13th century to the end of the 17th. The city-state of Venice is considered to have been the first real international financial center, emerging in the 9th century and reaching its greatest prominence in the 14th century. This made Venice a wealthy city throughout most of its history. After the Napoleonic Wars and the Congress of Vienna, the Republic was annexed by the Austrian Empire, until it became part of the Kingdom of Italy in 1866, following a referendum held as a result of the Third Italian War of Independence.

Between autumn and early spring, the city is often threatened by flood tides pushing in from the Adriatic. Six hundred years ago, Venetians protected themselves from land-based attacks by diverting all the major rivers flowing into the lagoon and thus preventing sediment from filling the area around the city. This created an ever-deeper lagoon environment. In 1604, to defray the cost of flood relief, Venice introduced what could be considered the first example of a "stamp tax".[citation needed] When the revenue fell short of expectations in 1608, Venice introduced paper, with the superscription "AQ" and imprinted instructions, which was to be used for "letters to officials". At first, this was to be a temporary tax, but it remained in effect until the fall of the Republic in 1797. Shortly after the introduction of the tax, Spain produced similar paper for general taxation purposes, and the practice spread to other countries.

During the 20th century, when many artesian wells were sunk into the periphery of the lagoon to draw water for local industry, Venice began to subside. It was realized that extraction of water from the aquifer was the cause. The sinking has slowed markedly since artesian wells were banned in the 1960s. However, the city is still threatened by more frequent low-level floods—the Acqua alta, that rise to a height of several centimetres over its quays—regularly following certain tides. In many old houses, staircases once used to unload goods are now flooded, rendering the former ground floor uninhabitable.

Studies indicate that the city continues sinking at a relatively slow rate of 1–2 mm per annum;  therefore, the state of alert has not been revoked. In May 2003, Italian Prime Minister Silvio Berlusconi inaugurated the MOSE Project (Modulo Sperimentale Elettromeccanico), an experimental model for evaluating the performance of hollow floatable gates; the idea is to fix a series of 78 hollow pontoons to the sea bed across the three entrances to the lagoon. When tides are predicted to rise above 110 cm, the pontoons will be filled with air, causing them to float and block the incoming water from the Adriatic Sea. This engineering work was due to be completed by 2018. The project is not guaranteed to be successful and the cost has been very high, according to a spokesman for the FAI (similar to the National Trust).

On 13 November 2019, Venice was flooded when waters peaked at 1.87 m (6 ft), the highest tide since 1966 (1.94 m). The planned flood barrier would have prevented this incident according to various sources, including Marco Piana, the head of conservation at St Mark’s Basilica.  A Reuters report stated that the MOSE Project attributed the delay to "corruption scandals". Over 85% of the city was underwater. The city's mayor, Luigi Brugnaro, blamed the floods on climate change but promised that work on the flood barrier would continue.