Scientific Investigations Report 2007–5186
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5186
Table 18. Summary of flow-adjusted trends in concentration of total nitrogen, total phosphorus, and suspended sediment in the Columbia River and Puget Sound basins, water years 1993–2003.
[FATC, Flow-adjusted trend in concentration]
| Constituent | Sites with | Total number of sites |
||
|---|---|---|---|---|
| Significant increasing FATC |
Significant decreasing FATC |
No significant FATC |
||
| Idaho | ||||
| Total nitrogen | 1 | 1 | 3 | 5 |
| Total phosphorus | 1 | 0 | 4 | 5 |
| Suspended sediment | 0 | 4 | 1 | 5 |
| Oregon | ||||
| Total nitrogen | 1 | 10 | 8 | 19 |
| Total phosphorus | 0 | 8 | 12 | 20 |
| Suspended sediment | 4 | 4 | 10 | 18 |
| Washington | ||||
| Total nitrogen | 0 | 8 | 12 | 20 |
| Total phosphorus | 6 | 1 | 18 | 25 |
| Suspended sediment | 0 | 7 | 18 | 25 |
| Summary | ||||
| Total nitrogen | 2 | 19 | 23 | 44 |
| Total phosphorus | 7 | 9 | 34 | 50 |
| Suspended sediment | 4 | 15 | 29 | 48 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5186
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