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Current or real-time information on stream-gage height, discharge, or other weather or water-quality properties are recorded every 15 minutes and transmitted at 1 to 4 hour intervals from an antenna attached to the roof of the gaging station to a satellite orbiting the earth. These data are then re-transmitted to receivers at various locations on earth (fig. 7). Real-time gage-height information is necessary for operating reservoirs, forecasting floods, and other purposes.
In New Hampshire and Vermont, there are about 98 real-time gages (fig. 1). Real-time data for these gages are available to the general public through the World Wide Web at:
http://nh.water.usgs.gov/WaterData/station_map.htm
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Figure
7. Diagram showing the data flow from real-time stream-gaging station to USGS web page.
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