USGS Groundwater Information
USGS Groundwater Information > August 1, 2018 Highlights
USGS Monthly Groundwater News and Highlights: August 1, 2018
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Feature: Secondary hydrogeologic regions of the conterminous United States
USGS previously identified and mapped 62 Principal Aquifers in the U.S., with 57 located in the conterminous states. Areas outside of the Principal Aquifers, which account for about 40% of the conterminous U.S., were collectively identified as "other rocks." A new study from the USGS subdivides this large area into Secondary Hydrogeologic Regions. Secondary Hydrogeologic Regions generally consist of low permeability rocks or deposits, but can include locally productive aquifers. Together with the Principal Aquifers of the U.S., the Secondary Hydrogeologic Regions provide a comprehensive, national-scale hydrogeologic framework for assessing and understanding groundwater systems.
Figure: Secondary hydrogeologic regions of the conterminous United States. Source: Belitz and others, 2018. Figure is in the public domain.
The USGS Active Groundwater Level Network includes about 20,000 wells that have been measured by the USGS or USGS cooperators at least once within the past 13 months. The animation shows a daily snapshot of water-level statistics in the network for July 2018. Credit: USGS. The image is in the public domain.
USGS Groundwater-Related Publications
Geochemistry and microbiology of groundwater and solids from extraction and monitoring wells and their relation to well efficiency at a Federally operated confined disposal facility, East Chicago, Indiana (07/24/18)
Prioritization of oil and gas fields for regional groundwater monitoring based on a preliminary assessment of petroleum resource development and proximity to California's groundwater resources (07/23/18)
Preliminary evaluation of the hydrogeology and groundwater quality of the Mississippi River Valley Alluvial Aquifer and Memphis Aquifer at the Tennessee Valley Authority Allen Power Plants, Memphis, Shelby County, Tennessee (07/13/18)
USGS Groundwater Flow and Transport Model Data Releases
Note: The following links take you to data.doi.gov
iTOUGH2-EOS7C model used to analyze multiphase flow and underpressured shale at the Bruce Nuclear Site, Ontario, Canada
MODFLOW-NWT inset models from the regional Lake Michigan Basin Model in support of groundwater age calculations for glacial aquifers
Field Photo of the Month
Did you know that USGS summer interns are gaining first-hand experience doing science at field sites, laboratories, and offices across the Nation this summer? In this photo, intern Kimberly Moore monitors wind conditions while providing field support for drones being used to study interaction between groundwater and surface water in the Elk Mountain Range in July 2018. Kimberly is interning with USGS to work on applied hydrogeophysics through the National Association of Geoscience Teachers (NAGT)/USGS 2018 Cooperative Summer Field Training Program.
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