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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

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*  Surface Water

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*  Water Use

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 [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 Temporal Scale



Select Methods to Compare METHOD CATEGORY SPATIAL SCALE TEMPORAL SCALE TYPICAL QUANTITY ESTIMATED EASE OF USE DATA NEEDS RELATIVE COST
Water-Table Fluctuations Groundwater Methods Local Day to Years Recharge Easy Low Low
Zero-Flux Plane Unsaturated Zone Methods Point Day to Years Potential Recharge Difficult High High
Zero-Tension Lysimeters Unsaturated Zone Methods Point Day to Years Potential Recharge Difficult Low High
Deep Percolation Model Water Budget Regional Day to Years Potential Recharge Moderate Moderate Moderate
HELP3 Model Water Budget Point to Regional Day to Years Potential Recharge Easy Low to Moderate Moderate
Watershed Models Streamflow Methods Watershed /Regional Days to Years Recharge Moderate High High
Temperature Tracer Methods Point Days to Years Recharge Moderate Moderate High
Seepage Meters Streamflow Methods Point Event to Months Potential Recharge Moderate Low Low
Recession-Curve Displacement Streamflow Methods Watershed Event to Years Net Recharge Moderate Low Low
Streamflow Gain/Loss Measurements Streamflow Methods Local Instantaneous Potential Recharge Easy Low Low
Darcian Methods Unsaturated Zone Methods Point Long-Term Average Potential Recharge Moderate Low High
Groundwater Modeling Groundwater Methods Local / Regional Month to Years Recharge Moderate High High
Tritium Tracer Methods Point Month to Years Recharge Moderate Moderate High
Chloride Tracer Methods Point Years Recharge Easy Moderate Moderate
Chlorofluorocarbons Tracer Methods Local Month to Years Recharge Difficult Moderate High
Stream Base-Flow Analysis Streamflow Methods Watershed Years Net Recharge Easy Low Low

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Page Last Modified: Wednesday, 26-Nov-2014 14:19:13 EST