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USGS Groundwater Information

Groundwater Resources Program

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 [Photo: Groundwater flowing out of well.]

New & Noteworthy

* Press Release: Study Explores Groundwater and Geothermal Energy in Drought-Stricken Eastern Oregon and Neighboring States

* Technical Announcement: USGS Issues Revised Framework for Hydrogeology of Floridan Aquifer

* Press Release: High Plains Aquifer Groundwater Levels Continue to Decline

* Regional Groundwater Availability Study Geospatial Data

* Press Release: USGS Assesses Current Groundwater-Quality Conditions in the Williston Basin Oil Production Area

Past listings...

USGS Groundwater Watch

USGS maintains a network of active wells to provide basic statistics about groundwater levels.

 [Image: USGS active water level wells location map.]

Other Water Topics

*  Water Resources

*  Groundwater

*  Surface Water

*  Water Quality

*  Water Use

USGS in Your State

USGS Water Science Centers are located in each state.

 [Map: There is a USGS Water Science Center office in each State.] Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii and Pacific Islands New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Comparison of Selected Methods for Estimating Groundwater Recharge In Humid Regions

Sorted by Method

Chloride Tracer Point Years Recharge Easy Moderate Moderate
Chlorofluorocarbons Tracer Local Month to Years Recharge Difficult Moderate High
Darcian Unit-Gradient Unsaturated Zone Point Long-Term Average Potential Recharge Moderate Low High
Deep Percolation Model Water Budget Regional Day to Years Potential Recharge Moderate Moderate Moderate
Groundwater Modeling Groundwater Local to Regional Month to Years Recharge Moderate High High
HELP3 Model Water Budget Point to Regional Day to Years Potential Recharge Easy Low to Moderate Moderate
Recession-Curve Displacement Streamflow Watershed Event to Years Net Recharge Moderate Low Low
Seepage Meters Streamflow Point Event to Months Potential Recharge Moderate Low Low
Stream Base-Flow Streamflow Watershed Years Net Recharge Easy Low Low
Streamflow Gain/Loss Measurements Streamflow Local Instantaneous Potential Recharge Easy Low Low
Temperature Tracer Point Days to Years Recharge Moderate Moderate High
Tritium Tracer Point Month to Years Recharge Moderate Moderate High
Watershed Models Streamflow Watershed to Regional Days to Years Recharge Moderate High High
Water-Table Fluctuations Groundwater Local Day to Years Recharge Easy Low Low
Zero-Flux Plane Unsaturated Zone Point Day to Years Potential Recharge Difficult High High
Zero-Tension Lysimeters Unsaturated Zone Point Day to Years Potential Recharge Difficult Low High

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Page Last Modified: Tuesday, 03-Jan-2017 20:46:16 EST