Figure 9.20: Every day the United States Geological Service (USGS) collects real-time water quality data at sampling stations around the country. This national map shows data on specific conductance (uS/cm) at these stations on November 8, 2010. The map can be changed to show different parameters such as temperature, conductance, pH, dissolved oxygen, turbidity and discharge. The map can be also be animated to show how these parameters have changed over the last month or year. Image from URL: http://waterwatch.usgs.gov/wqwatch/
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