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With California introducing the Sustainable Groundwater Management Act in 2014, new estimations of subsidence based on water usage plans have revealed that stretches of the California Aqueduct are still at a substantially high risk of subsidence. These projections range from 10-15 feet of subsidence in the most at risk areas. [16]
Ground water was pumped heavily, leading to the Santa Clara valley being the first region recognized to be affected by land subsidence in the 1940s. [2] Between 1912 and 1966, artesian pressure levels dropped more than 200 feet (61 m). The decreasing pressure heads resulted in land subsidence of up to 15 feet (4.6 m). [3]
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.
In 2019, the LA Department of Water and Power (LADWP) began replacing nearly 100-year-old power line poles cutting through Topanga State Park, when the project was halted within days by ...
The survey counted over 36 million dead trees, which is a dramatic increase, but there still may be more that were not counted. In a dramatic spike, 36.3 million trees died in California last year ...
Mine subsidence is a risk in areas where old mining sites exist. It is a type of surface-level ground movement that happens when there is an underground collapse or shift.
In 2004, a study conducted by the Geological Society of America analyzed the potential for land subsidence along the Cascadia subduction zone. It postulated that several towns and cities on the west coast of Vancouver Island, such as Tofino and Ucluelet, are at risk for a sudden, earthquake initiated, 1–2 m subsidence. [23]
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