Land Subsidence
Land Subsidence
Land Subsidence in California
Land Subsidence in California
Explore what causes land subsidence, how it is measured, and what areas of California have been affected.
Sustainable Groundwater Management Act (SGMA)
Sustainable Groundwater Management Act (SGMA)
USGS data, modeling tools, and scientific analysis to help water resource managers plan for, and assess, hydrologic issues associated with groundwater use and the SGMA sustainability indicators.
Explore the Science of Subsidence
Explore the Science of Subsidence
Filter Total Items: 27
Aquifer Compaction due to Groundwater Pumping
Although land subsidence caused by groundwater pumping has caused many negative effects on human civil works for centuries, especially in the highly developed urban or industrialized areas of Europe, the relation between subsidence and groundwater pumpage was not understood or recognized for a long time. Recognition began in 1928 when pioneer researcher O.E. Meinzer of the U.S. Geological Survey...
Land Subsidence in the San Joaquin Valley
The San Joaquin Valley is one of the most productive agricultural regions in the nation. Beginning around the 1920's, farmers relied upon groundwater for water supply. Over time, overpumping caused groundwater-level declines and associated aquifer-system compaction and land subsidence that resulted in permanent aquifer-system storage loss.
Low Intensity Chemical Dosing (LICD)
Rivers, wetlands, and agricultural operations supply natural organic material to the Sacramento-San Joaquin Delta (Delta) and the San Francisco Estuary. This natural organic matter provides many ecosystem benefits, but it also adversely affects drinking water. During drinking water treatment, chlorine added for purposes of pathogen control reacts with dissolved organic carbon (DOC) in the water to...