Streamflow patterns vary by the time of year at many locations.

Bar chart showing how streamflow varies by month.

Detailed Description

Monthly and yearly streamflow patterns

The U.S. Geological Survey (USGS) has been measuring streamflow at thousands of streams for over a century. When extensive records of past streamflows exist, it is possible to see a pattern of streamflow variation by month and season. Of course, every stream exhibits its own unique patterns, each stream "resides" in its own spot on the Earth's landscape, and each reacts differently to weather conditions, such as precipitation, seasonal differences, and evaporation.

 

Details

Image Dimensions: 1200 x 380