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Mexico City is an example of a sinking city that is neither coastal nor low-lying. The city was originally constructed by the Aztecs above a large aquifer in the 1300s. Subsidence was originally caused by the loading of large Aztec and Spanish structures. The city grew rapidly during the nineteenth century, and with it, so did the demand for water.
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In a 2019 study, researchers found that stretches of the California Aqueduct had sunk in a way that have caused up to 20% loss in carrying capacity of water. [15] Building foundations, pipelines, and other infrastructure may be at risk of damage as well. Areas with substantial subsidence may be at higher risk of flooding.
Mexico City subsidence. Groundwater-related subsidence often results in major damage to urban areas. In Mexico City, the buildings interact with the settlement, and cause cracking, tilting, and other major damage. [7] In many places, large sinkholes open up, as well as surface cavities.
About 2,250 additional people in Wilmington will be exposed to high-tide flooding if subsidence continues at the same pace, the researchers found, with the value of homes exposed to flooding in ...
Subsidence frequently causes major problems in karst terrains, where dissolution of limestone by fluid flow in the subsurface creates voids (i.e., caves).If the roof of a void becomes too weak, it can collapse and the overlying rock and earth will fall into the space, causing subsidence at the surface.
With long-term declines in groundwater levels putting thousands of domestic wells at risk and causing the ground to sink in parts of the San Joaquin Valley, state regulators are moving forward ...