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USGS National Water Information System
These pages provide access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, and Puerto Rico. Online access to this data is organized around the categories listed to the left. The USGS investigates the occurrence, quantity, quality,...
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Water
Water has been important to all peoples of the earth, and it is rich in spiritual tradition.
Water is one of the four classical elements in ancient Greek philosophy and science. It was commonly associated with the qualities of emotion and intuition....
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Stream gauge
A stream gauge, or stream gage, refers to a site along a stream where measurements of volumetric discharge (flow) are made.
Automated direct measurement of streamflow discharge is difficult at present. In place of the direct measurement of...
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Water quality
Water quality is the physical, chemical and biological characteristics of water. It is most frequently used by reference to a set of standards against which compliance can be assessed. The most common standards used to assess water quality relate to...
