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The Central Valley in California subsides when groundwater is pumped faster than underground aquifers can be recharged. The Central Valley has been sinking at differing rates since the 1920s and is estimated to have sunk up to 28 feet. [1] During drought years, the valley is prone to accelerated subsidence due to groundwater extraction.
The Central Valley lies within the California Trough physiographic section, which is part of the larger Pacific Border province, which in turn is part of the Pacific Mountain System. [11] [12] Excessive groundwater pumping in Central Valley has caused measurable amounts of land subsidence in recent years. [13]
The Central Valley, where a large portion of the California Aqueduct runs through, has been affected by the pumping of groundwater and subsequent land subsidence. [25] Farmers in and near the Central Valley have become reliant on groundwater especially with recent droughts impacting the amount of readily accessible surface water. [20]
Land subsidence, in particular, is posing significant threats to water infrastructure in the Central Valley, which is sinking faster than any other part of the state.
How the Central Valley became a fertile land for Southerners, 1924 KKK “fiesta” | Opinion. Dr. Patrick Fontes. September 21, 2023 at 12:37 PM.
Land subsidence is a global issue and has different causes. Some are natural, like earthquakes, and some are caused by humans. In the United States, land subsidence from over pumping has affected 45 states and accounts for changes in over 17,000 square miles of land which is an area almost 10 times the size of Glacier National Park in Montana. [14]
Groundwater-related subsidence is the subsidence (or the sinking) of land resulting from unsustainable groundwater extraction. It is a growing problem in the developing world as cities increase in population and water use, without adequate pumping regulation and enforcement.
Hopes of cutting through Central America to connect the world’s oceans date back to the early 16 th century, when Spanish explorers surveyed routes along the Chagres River and deemed any path ...