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Subsidence
Plate tectonics
The forces causing the subsidence now are likely natural ones that have been impacting the area for a long time, particularly plate tectonics. The Adriatic plate, on which Venice sits, is subducting beneath the Apennines Mountains and causing the city and its environs to drop slightly in elevation. The compaction of the sediments beneath Venice also remains a factor.
Floods are happening more frequently along Venice's canals now, Bock said, with residents having to walk on wooden planks to stay above the floodwaters in large parts of the city about four or five times a year.
Pumping of the ground water
The pumping of shallow groundwater in the mid-1900s also contributed to the problem. Water in the pores between grains of sediment provides pressure that bears some of the load. When pore pressure decreases, or water is removed completely, grains can be packed together more tightly by collapsing the pore spaces. As sediment is compacted, the land surface drops. While the effect was small (less than 15cm), Venice doesn't have much wiggle room.
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