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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]
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]
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]
California’s eco-bureaucrats halted a wildfire prevention project near the Pacific Palisades to protect an endangered shrub. It’s just the latest clash between fire safety and conservation in ...
Based on two recent aerial surveys, the U.S. Forest Service has estimated that nearly 12.5 million trees have died due to the area?s severe drought conditions.
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 ...
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.
Several majestic palm trees that usually flank the Refugio State Beach just north of Santa Barbara have come crashing down in recent days. Images show how the massive, 100-year-old trees were ...