USGS - science for a changing world

USGS Groundwater Information

Groundwater Resources Program

*  Home *  Regional GW Studies *  GW & Environment * Methods & Modeling *  Publications *  Data & Information
 [Photo: Groundwater flowing out of well.]

New & Noteworthy

New!: * Regional Groundwater Availability Study Geospatial Data

New: * 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.

Methods for Estimating Groundwater Recharge In Humid Regions

Recharge has been defined as the process of addition of water to the saturated zone. Because it is almost impossible to measure directly, recharge is usually estimated by indirect means. The accuracy of the indirect estimates is usually difficult to determine, so a common recommendation is that recharge should be estimated by the use of multiple methods and the results compared.

This site describes the application, data needs, strengths, and weaknesses of widely-used methods for estimating groundwater recharge that have general applicability in humid regions of the U.S. The site is designed to be a quick-reference or resource guide for selecting appropriate methods for estimating recharge in humid areas. Currently, the site provides a comparison of 15 methods. Three methods are described in detail -- Darcy method, water-table fluctuation method, and recession-curve displacement method.

USGS Home Water Climate and Land Use Change Core Science Systems Ecosystems Energy and Minerals Environmental Health Natural Hazards

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://water.usgs.gov/ogw/gwrp/methods/index.html
Page Contact Information: Contact the Groundwater Resources Program
Page Last Modified: Wednesday, 26-Nov-2014 14:30:09 EST