This is the USGS Water Science for School's page and the topic is surface water. Explained are surface water use, importance, rivers and streams. Also answers the questions of what is runoff, how is the flow of a stream...

This collaboration between Kansas State University and the Kansas Geological Survey provides an extensive collection of links to resources associated with the High Plains aquifer. Topics include the basic hydrology of...

USGS summary of the water cycle complete with diagrams, pictures and text. This is an excellent resource from the Geological Survey, that is great for students and can be included in the classroom along with lessons.

This portal provides access to a large selection of real-time and archived data on stream flow and water quality for surface and groundwater. Links are provided to the National Water Information System Web Interface...

This resource from the United States Geological Survey contains information for students on the many aspects of water; includes pictures, data, maps, an interactive center where you can give opinions and test your water...