USGS streamflow map of compared to historical, 2006 - Water Year Summa ry
- Map of real-time streamflow compared to historical
streamflow for the day of the year (United States)
Jan 13, 2007
Streamflow of 2006 - Water Year Summary
U.S. Geological Survey
Fw: [CCG] US streamflow data for 2006
U.S. Department of the Interior
U.S. Geological Survey
For release: January 12, 2007
Contact: Harry Lins, 703-648-5712, hlins@...
First Annual Streamflow Summary Available
This past year has produced some record-breaking high streamflow
conditions in the Northeast, as well as some near-record lows in other
areas of the country, according to the U.S. Geological Survey (USGS).
In a new USGS publication, "Streamflow of 2006 - Water Year Summary,"
changes in streamflow over the course of 2006 are examined relative to
conditions over the past 75 years.
Some areas of the country experienced higher streamflow than usual.
For example, parts of New England recorded their highest annual flows
since 1930. At the same time, below normal conditions were prevalent
in Texas and other states in the central and southern Great Plains,
parts of the Southeast, and Alaska.
"Despite these regional highs and lows, however, streamflow conditions
nationwide were relatively typical," says Harry Lins, hydrologist with
the USGS surface-water program. "We expect in any given year that one
percent of streamgages will experience a new all-time record high or
all-time record low streamflow. In 2006, two percent of streamgages
reported new record high streamflow, most of which were in New
England, and one percent of streamgages experienced new record lows."
USGS plans to provide similar summaries every year. Robert Hirsch,
Associate Director for Water, said "These types of summaries are very
important as they place annual streamflow in a historic context and
help to provide insights on whether conditions reflect short-term
(year to year or seasonal) hydrologic fluctuations or longer term,
more global influences. They reinforce the critical need for a stable
streamflow monitoring network over the long term."
This first-ever USGS summary of seasonal, regional, and national
streamflow conditions for water year 2006 can be accessed at
For more than 125 years, the USGS has monitored flow in selected
streams and rivers across the U.S. The USGS collects data from more
than 7,400 streamgages, many of which provide real-time data in 15
minute increments (explore this information at
http://water.usgs.gov/waterwatch/ ). The information is routinely used
for water supply and management, monitoring floods and droughts,
bridge and road design, and for many recreational activities.
Access an even larger variety of USGS data, such as for ground water
and water quality, through the National Water Information System Web
Interface (NWISWeb), which contains over 1.5 million sites, and
averages over 25 million hits per month (log onto at
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