WaterWatch (http://waterwatch.usgs.gov)
is a U.S. Geological Survey (USGS) World Wide Web site that displays
maps, graphs, and tables describing real-time, recent, and past
streamflow conditions for the United States. The real-time information
generally is updated on an hourly basis. WaterWatch provides
streamgage-based maps that show the location of more than 3,000
long-term (30 years or more) USGS streamgages; use colors to represent
streamflow conditions compared to historical streamflow; feature a
point-and-click interface allowing users to retrieve graphs of stream
stage (water elevation) and flow; and highlight locations where extreme
hydrologic events, such as floods and droughts, are occurring. The
streamgage-based maps show streamflow conditions for real-time,
average daily, and 7-day average streamflow. The real-time streamflow
maps highlight flood and high flow conditions. The 7-day average
streamflow maps highlight below-normal and drought conditions. WaterWatch
also provides hydrologic unit code (HUC) maps. HUC-based maps are
derived from the streamgage-based maps and illustrate streamflow
conditions in hydrologic regions. These maps show average streamflow
conditions for 1-, 7-, 14-, and 28-day periods, and for monthly
average streamflow; highlight regions of low flow or hydrologic
drought; and provide historical runoff and streamflow conditions
beginning in 1901. WaterWatch summarizes streamflow conditions in
a region (state or hydrologic unit) in terms of the long-term typical
condition at streamgages in the region. Summary tables are provided
along with time-series plots that depict variations through time.
WaterWatch also includes tables of current streamflow information and
locations of flooding.