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U.S. Geological Survey Scientific Investigations Series 2009-5268

Trends in Water Quality in the Southeastern United States, 1973–2005

Skip past contents information/ Title Page / Foreword / List of Tables / List of Figures / Conversions / Introduction / Previous Studies / Data / Methods / Water-Quality Trends / Trend Associations / Summary and Conclusions / References /

Figure 6. Trends in nitrite plus nitrate concentration at selected National Water Information System sites in the Southeast


Figure 6. Trends in nitrite plus nitrate concentration at selected National Water Information System sites in the Southeast. Only sites with detected trends are shown. [tobit, Tobit regression; cen seaken, seasonal Kendall test for censored data; uncen seaken, seasonal Kendall test for uncensored data.]

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