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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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Southwest Principal Aquifers Regional Ground-Water Quality Assessment [More info]: Study of the susceptibility and vulnerability of basin-fill aquifers in the region to ground-water contamination by synthesizing the information on ground-water quality conditions in 15 basins from previous studies.
Sustainability of natural attenuation of nitrate in agricultural aquifers [More info]: Nitrate from fertilizer is degraded by microbial action in the presence of solid minerals. This helps mitigate the effect of the nitrate, but begins to diminish the solid minerals needed. Will the process be sustainable in the long term?
Unconsolidated aquifers of upstate New York [More info]: Information on aquifers in upstate New York which consist of unconsolidated deposits of sand and gravel that occupy major river and stream valleys or lake plains. Links to aquifer maps at scales 1:24,000 or 1:250,000 and cooperative publications.
Water resources of Virginia - Virginia aquifer susceptibility [More info]: Overview of a project in Virginia to develop a program for assessing public supply source waters to determine their susceptibility to contamination and to determine which systems need detailed source-water assessments.
Water-Level Changes in the High Plains Aquifer, Predevelopment to 2002, 1980 to 2002, and 2001 to 2002 [More info]: Data from some 7,000 wells monitoring annual water level changes in the High Plains aquifer indicting changes in water level 1980 to 2002.
A new tool to assess groundwater resources in the Mississippi embayment [More info]: Mathematical model of the groundwater system in this area includes 13 types of data and spans multiple aquifers over more than a century. This enables us to assess the quantity of groundwater, where and how it is being used, and how pumping affects it.
An interpretation of the 1977 Airborne Electromagnetic (AEM) survey, Fort Huachuca vicinity, Cochise County, Arizona [More info]: Complex report on the interpretation of aeromagnetic data to study hydrogeology of the San Pedro basin, Cochise County, Arizona determining geologic structure, basin fill and depth to water. Online version of a CD-ROM publication.
California Water-Quality Assessment [More info]: Results of activities in California conducted under the National Water-Quality Assessment Program (NAWQA): maps, publications and data.
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.

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