Scientific Investigations Report 2007–5186
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5186
Table 17. Number of sites with significant decreasing, increasing, or no flow-adjusted trend in concentration by collecting/analyzing agency in the Columbia River and Puget Sound basins, water years 1993–2003.
[Abbreviations: CWS, Clean Water Services; FATC, flow-adjusted trend in concentration; ODEQ, Oregon Department of Environmental Quality; WDOE, Washington State Department of Ecology; USGS, U.S. Geological Survey]
| Constituent | Number of sites with data for trend testing | Number of sites with decreasing FATC | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| USGS | ODEQ | WDOE | CWS | Total sites | USGS | ODEQ | WDOE | CWS | Total sites (percent) |
||
| Total nitrogen | 11 | 13 | 18 | 2 | 44 | 1 | 9 | 8 | 1 | 19 (43) |
|
| Total phosphorus | 11 | 14 | 23 | 2 | 50 | 1 | 6 | 0 | 2 | 9 (18) |
|
| Suspended sediment | 11 | 14 | 23 | 0 | 48 | 8 | 1 | 6 | 0 | 15 (31) |
|
| Constituent | Number of sites with increasing FATC | Number of sites with no FATC | |||||||||
| USGS | ODEQ | WDOE | CWS | Total sites (percent) |
USGS | ODEQ | WDOE | CWS | Total sites (percent) |
||
| Total nitrogen | 2 | 0 | 0 | 0 | 2 (5) |
8 | 4 | 10 | 1 | 23 (52) |
|
| Total phosphorus | 1 | 0 | 6 | 0 | 7 (14) |
9 | 8 | 17 | 0 | 34 (68) |
|
| Suspended sediment | 0 | 4 | 0 | 0 | 4 (8) |
3 | 9 | 17 | 0 | 29 (60) |
|
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5186
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