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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

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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.]

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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.

Recession-Curve Displacement Method for Estimating Groundwater Recharge In Humid Regions

Timing of Recharge

"The RORA program is formulated with the assumption of recharge at the time of peaks in streamflow. The estimate of recharge is subject to uncertainty because the precise time of recharge is unknown." (Rutledge, 2000).

One way of evaluating the performance of RORA is to compare days that recharge is determined by RORA with rises of the water table. Risser and others (2005b) showed the correspondence between the timing of recharge events determined by RORA with records of precipitation, fluctuations in observation wells, and percolate collected in zero-tension lysimeters.

Timing of Recharge

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Page Last Modified: Tuesday, 03-Jan-2017 20:46:37 EST