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The USGS, in cooperation with more than 800 state, local and other federal agencies, operates approximately 7,000 continuously active streamflow measurement and data collection sites, called ... streamgages. Almost 5,000 of the USGS's approximately 7,000 streamgages are equipped with telemetry that transmits a reading of stream depth ("stage") to a district office via satellite or telephone. This "realtime" data is used for a multiplicity of purposes: including flood hazard mitigation by the National Weather Service, the U.S. Army Corps of Engineers, and the Federal Emergency Management Agency; and for resource planning, and infrastructure design of reservoirs and dams.

http://www.nationalatlas.gov/articles/water/a_streamflow.html