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 [Photo: Groundwater flowing out of well.]

New & Noteworthy

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

* new: Regional Groundwater Availability Study Geospatial Data

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

* HydroClimATe -- Hydrologic and Climatic Analysis Toolkit

* National Groundwater Awareness Week 2014

* National Brackish Groundwater Assessment

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.

Water-Table Fluctuation (WTF) Method

Estimating the Water-Level Rise (DH(tj))

Figure 2. Determination of water-level rise.
Determination of water-level rise.

The water-level rise DH(tj) is estimated as the difference between the peak of a water-level rise and the value of the extrapolated antecedent recession curve at the time of the peak. The recession curve is the trace that the well hydrograph would have followed had there not been any recharge. Extrapolation of the recession curve is not always straightforward.

At least two approaches can be used to estimate DH(tj) in the WTF method: graphical extrapolation and calculation from a master recession curve (MRC). A third approach used to estimate DH(tj), made on the basis of the computer code from the RISE program (A. Rutledge, U.S. Geological Survey, written commun., 2005), does not extrapolate for continuation of a hypothetical recession while the water table is rising. Because of the need for daily water-level data, the MRC and RISE approaches can be applied only at sites where water levels were continuously monitored.

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Page Last Modified: Wednesday, 26-Nov-2014 14:20:04 EST