Fact Sheet 2007–3062
IntroductionThe maps and graphs appearing in this summary describe streamflow conditions for water-year 2006 (October 1, 2005 to September 30, 2006) in the context of the 77-year period 1930–2006, unless otherwise noted. The illustrations are based on observed data from the U.S. Geological Survey’s National Streamflow Information Program. The period 1930–2006 was used because prior to 1930, the number of streamgages was too small to provide representative data for computing statistics for most regions of the country. In the summary, reference is made to the term “runoff” which, as used here, expresses the depth to which a river basin, State, or other geographic area would be covered with water if all the streamflow within that area during a single year was uniformly distributed upon it. Runoff quantifies the magnitude of water flowing through the Nation’s rivers and streams in measurement units that are comparable from one area to another. The runoff value for a geographic area is computed as the median runoff for all streamgages in that area. For example, the runoff value for a State is the median for all streamgages in that State, and the median for the Nation is the median value for all streamgages in the Nation. Each of the maps and graphs can be expanded to a larger view by clicking on the image. In all the graphics, a rank of 1 indicates the highest flow of all years analyzed. |
First posted July 2007 For additional information contact: Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
Jian, Xiaodong, Wolock, D.M., and Lins, H.F., 2007, Streamflow of 2006—Water year summary: U.S. Geological Survey Fact Sheet 2007–3062, 8 p., available only at https://pubs.usgs.gov/fs/2007/3062.