Appendixes 1–8

Appendix 1. Methods—Data Retrieval, Screening, and Modification

Contents

Appendix 1 in PDF format

USGS Water-Quality Data Retrieval and Screening

National Stream Water-Quality Monitoring Networks (WQN) Data

National Water Information System (NWISWeb)

Data Modifications

Recensoring

Parameter Codes, Calculated Values, and Order of Precedence for Use in Analyses

Reference

Appendix 2. Methods—Stations Used in Analysis of Discharge Conditions

Appendix 2 in Excel format (40 KB)

Appendix 2 in Excel file format, zipped (66 KB)

Table

2–1. List of U.S. Geological Survey streamgages used in analysis of streamflow conditions, and summary of analyses performed

Appendix 3. Methods—Flow-Adjusted Trend Analysis with Tobit Regression in the S-ESTREND System

Appendix 3 in PDF file format (72 KB)

Contents

Flow-Adjusted Trend Analysis
References

 

Appendix 4. Methods—Trend Analysis Using Coupled Statistical Model of Streamflow and Water Quality

Appendix 4 in PDF file format (65 KB)

Contents

Definition of Non-Flow-Adjusted Trend

Flow-Adjusted Trend in Concentration

Unit Trends and Reference Values

Additional Interpretive Notes

Reference

Appendix 5. Results—Trends in Streamflow, 1975–2003 and 1993–2003

Appendix 5 in Excel format (38 KB)

Appendix 5 in Excel file format, zipped (11 KB)

Table

5–1. Trends in streamflow, and serial correlation of residuals, 1975–2003 and 1993–2003

Appendix 6. Results—Trend Analysis on Flow-Adjusted Nutrient Concentrations, 1975–2003 and 1993–2003

Appendix 6 in Excel format (96 KB)

Appendix 6 in Excel file format, zipped (29 KB)

Table

6–1. Results of trend analysis on flow-adjusted nutrient concentrations, using Tobit regression and coupled statistical model of streamflow and water quality, 1975–2003 and 1993–2003

Appendix 7. Results—Annual Load Estimates, 1975–2003, 1993–2003, and Varied Periods of Record

Individual appendix 7–1a to 7–1n in Excel file format

7-1a, 7-1b, 7-1c, 7-1d, 7-1e, 7-1f, 7-1g, 7-1h, 7-1i, 7-1j, 7-1k, 7-1l, 7-1m, 7-1n

Appendix tables 7–1a to 7–1n in Excel file format, zipped

Appendix tables 7-1a to7-1e (1.87 MB)

Appendix tables 7-1f to 7-1k (315 MB)

Appendix tables 7-1l to 7-1n (1.20 MB)

Tables

7–1. Annual load estimates, confidence intervals, and yields, 1975–2003, 1993–2003, and varied periods of record

7–1A. Annual load estimates, confidence intervals, and yields for total nitrogen, 1975–2003

7–1B. Annual load estimates, confidence intervals, and yields for total nitrogen, 1993–2003

7–1C. Annual load estimates, confidence intervals, and yields for ammonia nitrogen, 1975–2003

7–1D. Annual load estimates, confidence intervals, and yields for ammonia nitrogen, 1993–2003

7–1E. Annual load estimates, confidence intervals, and yields for total Kjeldahl nitrogen, 1975–2003

7–1F. Annual load estimates, confidence intervals, and yields for nitrite-plus-nitrate nitrogen, 1975–2003

7–1G. Annual load estimates, confidence intervals, and yields for nitrite-plus-nitrate nitrogen, 1993–2003

7–1H. Annual load estimates, confidence intervals, and yields for total phosphorus, 1975–2003

7–1I. Annual load estimates, confidence intervals, and yields for total phosphorus, 1993–2003

7–1J. Annual load estimates, confidence intervals, and yields for suspended sediment, 1975–2003

7–1K. Annual load estimates, confidence intervals, and yields for suspended sediment, 1993–2003

7–1L. Annual load estimates, confidence intervals, and yields for total nitrogen, varied periods of record

7–1M. Annual load estimates, confidence intervals, and yields for nitrite-plus-nitrate nitrogen, varied periods of record

7–1N. Annual load estimates, confidence intervals, and yields for total phosphorus, varied periods of record

Appendix 8. Results—Trend Analysis on Nutrient Loads, 1975–2003 and 1993–2003

Appendix 8 in Excel file format (38 KB)

Appendix 8 in Excel file format, zipped (11 KB)

Table

8–1. Results of trend analysis on nutrient loads, calculated by using coupled statistical model of streamflow and water quality, 1975–2003 and 1993–2003