USGS: Science Topics: aquifers

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Aquifers

Bodies of rock that contain sufficient saturated permeable material to conduct ground water and to yield significant quantities of water to wells and springs. [Glossary of Geology, 4th ed.]

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California Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project--shallow aquifer assessment [More info]: Explains why we are assessing water quality in shallow aquifers, what we are measuring, and how the results will be reported both to well owners and to the public.
California Water-Quality Assessment [More info]: Results of activities in California conducted under the National Water-Quality Assessment Program (NAWQA): maps, publications and data.
Changes in Water Levels and Storage in the High Plains Aquifer, Predevelopment to 2007 [More info]: Summarizes changes in water levels and drainable water in storage in the High Plains aquifer from predevelopment (before about 1950) to 2007.
Changes in water levels and storage in the High Plains Aquifer, predevelopment to 2009 [More info]: Summarizes graphically the areas where water levels have dropped, and by how much, in this extensive underground water reservoir that covers several states in the mid-continent.
Characterizing contaminant concentrations with depth by using the USGS well profiler in Oklahoma, 2003-9 [More info]: Use of specialized sampling equipment to study public water supply wells, with examples showing Arsenic in two aquifers.
Decadal-scale changes in dissolved-solids concentrations in groundwater used for public supply [More info]: Recent increases in dissolved-solids concentrations in this aquifer have been documented in some areas used for public supply, raising concerns as to the sources and causes of the higher concentrations and the long-term effects on groundwater quality.
Detection and measurement of land subsidence using Global Positioning System surveying and interferometric synthetic aperture radar, Coachella Valley, California, 1996-2005 [More info]: Detailed measurements of elevation help to understand the extent and severity of subsidence. Study asks if subsidence indicates the aquifer system is compacting temporarily or permanently, and are the changes human-induced or tectonic.
Drought and deluge: Effects of recent climate variability on groundwater levels in eastern Arkansas [More info]: Water levels in wells completed in the Mississippi River Valley alluvial aquifer and the Sparta aquifer in eastern Arkansas respond to variability associated with annual precipitation.
Edwards Aquifer online resources [More info]: Recharge and discharge summaries and other data, aeromagnetic survey map, and publications on Edwards Aquifer, Texas.
Enhancement of USGS scientific investigations in Texas by using geophysical techniques, 2005-10 [More info]: Annotated bibliography describing the use of electromagnetic surveying to understand the characteristics of aquifers and how they work.

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