Average Annual Runoff, 1951-1980
Source: USGS, 1986
Map Description:
This coverage is intended as a thematic data layer representing average annual runoff, in inches, per year, for the conterminous United States. Appropriate maps of the data can show the geographical distribution of runoff in tributary streams for the years 1951-80 and can describe the magnitude and variation of runoff nationwide.

Cautions for this Product:
The data was prepared to reflect the runoff of tributary streams rather than in major rivers in order to represent more accurately the local or small scale variation in runoff with precipitation and other geographical characteristics. Data were compiled in 1985. Streamflow data were collected at over 12,000 gaging stations during 1951-80; 5,951 stations were selected for the analysis.

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