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USGS Water Resources of the United States: Ground Water

Sponsoring Organization:  U.S. Geological Survey

Description:  The USGS National Water Information System (NWIS) contains extensive water data for the Nation. Public access to many of these data is provided via NWISWeb. The Ground-Water database consists of more than 850,000 records of wells, springs, test holes, tunnels,drains, and excavations in the United States. Available site descriptive information includes well location information such as latitude and longitude, well depth, and aquifer. The USGS annually monitors ground-water levels in thousands of wells in the United States. Ground-water level data are collected and stored as either discrete field-water-level measurements or as continuous time-series data from automated recorders. Data from some of the continuous record stations are relayed to USGS offices nationwide through telephone lines or by satellite transmissions providing access to realtime ground-water data. Once a complete day of readings are received from a site, daily summary data are generated and made available online. Annually, the USGS finalizes and publishes the daily data in a series of water-data reports.

Web Site:  http://waterdata.usgs.gov/nwis/gw

Duration:  03/03/1879 to present  (as of 06/04/2008)

Program Contact Web URL:  http://waterdata.usgs.gov/nwis/feedback/?to=NWISWeb%20Data%20Inquiries

Program Purpose:  To provide reliable, impartial, timely information that is needed to understand the Nationís water resources. WRD actively promotes the use of this information by decision makers to: * Minimize the loss of life and property as a result of water-related natural hazards, such as floods, droughts, and land movement. * Effectively manage ground-water and surface-water resources for domestic, agricultural, commercial, industrial, recreational, and ecological uses. * Protect and enhance water resources for human health, aquatic health, and environmental quality. * Contribute to wise physical and economic development of the Nationís resources for the benefit of present and future generations.

Data Access Web URL:  http://waterdata.usgs.gov/nwis/gw

Data Access Information:  The USGS National Water Information System for the Web (NWISWeb) went online in 2001. Since then the USGS has noticed an increasing number of users have developed automated ways to retrieve information served by this system. The USGS supports the use of automated retrievals as long as they are performed correctly and do not adversely affect performance of the system. This document describes approaches that will help users perform automated retrievals efficiently. Frequently Asked Questions about Data Access: http://waterdata.usgs.gov/nwis/news/?automated_retrieval_info#FAQ

Monitoring Stations:  23142 stations are registered in the database (search/display)

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