Scientific Investigations Report 2007–5186
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5186
Table 13. Summary of annual yields for total nitrogen, total phosphorus, and suspended sediment in the Columbia River and Puget Sound basins, water years 1997, 2000, and 2001.
[Abbreviations: TN, total nitrogen; TP, total phosphorus; SS, suspended sediment; lb/yr/mi2, pound per year per square mile; ton/yr/mi2, ton per year per square mile]
| Yields | |||
|---|---|---|---|
| TN (lb/yr/mi2) |
TP (lb/yr/mi2) |
SS (ton/yr/mi2) |
|
| Water year 1997 (high flow year) | |||
| Count | 66 | 67 | 63 |
| Minimum | 292 | 58.4 | 1.72 |
| Median | 3,790 | 490 | 132 |
| Maximum | 81,900 | 3,780 | 13,500 |
| Water year 2000 (average flow year) | |||
| Count | 70 | 81 | 65 |
| Minimum | 177 | 16.8 | 1.57 |
| Median | 1,740 | 180 | 35 |
| Maximum | 32,300 | 1,460 | 1490 |
| Water year 2001 (low flow year) | |||
| Count | 71 | 81 | 64 |
| Minimum | 79.9 | 9.51 | .23 |
| Median | 803 | 74.6 | 6.82 |
| Maximum | 7,210 | 433 | 194 |
U.S. Department of the Interior | U.S. Geological Survey
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