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Table 1. Physical property and water-chemistry data retrieved for analysis from the U.S. Geological Survey National Water Information System for water years 1973–2005 |
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Table 2. Combination procedures used to define combined constituents identified by parameter codes 10000, 20000, 30000, 50000, 60000, and 70000 |
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Table 3. Water-quality data tables retrieved from the U.S. Geological Survey National Water Information System for selected monitoring sites, by state, and analyzed for temporal trends or in-stream loads |
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Table 4. Water-quality data tables retrieved from the U.S Environmental Protection Agency Storage and Retrieval database for selected monitoring sites, by state, and analyzed for temporal trends |
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Table 5. Continuous streamflow datasets obtained from the U.S. Geological Survey National Water Information System and used for estimating loads |
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Table 6. Selected water-quality monitoring sites, by state, used in the temporal trend analyses of chemical constituent and physical property data retrieved from the U.S. Geological Survey National Water Information System |
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Table 7. Trend-test results for water-quality data retrieved from the U.S. Geological Survey National Water Information System |
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Table 8. Trend-test results for physical properties and water-quality data retrieved from the U.S. Geological Survey National Water Information System |
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Table 9. Selected water-quality monitoring sites, by state, used in the temporal trend analysis of nutrient data retrieved from the U.S Environmental Protection Agency Storage and Retrieval database |
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Table 10. Trend-test results for total nitrogen and total phosphorus for water-quality data retrieved from the U.S. Environmental Protection Agency Storage and Retrieval database |
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Table 11. Basin characteristics for selected U.S. Geological Survey National Water Information System and U.S Environmental Protection Agency Storage and Retrieval water-quality monitoring sites |
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Table 12. Selected water-quality monitoring sites for which data were retrieved from the U.S. Geological Survey National Water Information System and analyzed for in-stream nutrient loads |
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Table 13. Annual load estimates for the period 1973–2005 |
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Table 14. Annual yield estimates, in tons per square mile, for the period 1973–2005 |
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Table 15. Annual yield estimates, in kilograms per square kilometer, for the period 1973–2005 |
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Appendix 1 |
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Table A1. Definitions of basin characteristics compiled for U.S. Geological Survey National Water Information System (NWIS) and U.S Environmental Protection Agency Storage and Retrieval (STORET) sites listed in table 11 of the report |
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Appendix 2 |
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Tables LDR4 – LDR9. Summary statistics for annual load and yield estimates at each site used in the analyses. The time periods for the summary load statistics vary and can be obtained from table 12 of the report |
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Table LDR4. Summary statistics of mean annual load estimates, in kilograms, for selected constituents |
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Table LDR5. Summary statistics of median annual load estimates, in kilograms, for selected constituents |
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Table LDR6. Summary statistics of mean annual yield estimates, in kilograms per square kilometer, for selected constituents |
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Table LDR7. Summary statistics of median annual yield estimates, in kilograms per square kilometer, for selected constituents |
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Table LDR8. Summary statistics of mean annual yield estimates, in tons per square mile, for selected constituents |
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Table LDR9. Summary statistics of median annual yield estimates, in tons per square mile, for selected constituents |
U.S. Department of the Interior |
U.S. Geological Survey