The buildings of Venice are constructed on closely spaced wood piles, which penetrate alternating layers of clay and sand. Wood for piles was cut in the most western part of today's Slovenia, resulting in the barren land in a region today called Kras, and in two regions of Croatia, Lika and Gorski Kotar. Most of these piles are still intact after centuries of submersion. The foundations rest on the piles, and buildings of brick or stone sit above these footings. The buildings are often threatened by flood tides pushing in from the Adriatic between autumn and early spring. 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. 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 the aquifer was the cause. This sinking process has slowed since artesian wells were banned in the 1960s. However, the city is still threatened by more frequent low-level floods (so-called acqua alta, “high water”) that creep to a height of several centimeters over its quays, regularly following certain tides. In many old houses the former staircases used by people to unload goods are now flooded, rendering the former ground floor uninhabitable. Many Venetians have resorted to moving up to the upper floors and continuing with their lives.
Labels: Travel information
posted by Hills @ 7:26 AM
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