Water

US Geological Survey Federal source for science about the Earth, its natural and
living resources, natural hazards, and the environment.

Monthly Map of Streamflow Conditions Historical Maps of Monthly and Annual Streamflow Conditions by Water Year

Historical Data on Streamflow in the United States Data are collected by field personnel or relayed through telephones or satellites to offices where it is stored and processed. The data relayed through the Geostationary Operational Environmental Satellite (GOES) system are processed automatically in near real time, and in many cases, real-time data are available online within minutes.

Real-Time Streamflow in United States Real-time data typically are recorded at 15-60 minute intervals, stored onsite, and then transmitted to USGS offices every 1 to 4 hours, depending on the data relay technique used. Recording and transmission times may be more frequent during critical events.

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Revised: 9 June 2005

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