Scientific Investigations Report 2007–5186
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5186
Table 6. Quartile ranges for total nitrogen and total phosphorus point-source loads in the Columbia and Puget Sound basins, water year 2000.
[All loads are in pounds per year. Abbreviations: TN, total nitrogen; TP, total phosphorus]
| Point-source loads | Quartile range | |||
|---|---|---|---|---|
| 1st | 2nd | 3rd | 4th | |
| TN | 550–38,500 | 44,900–90,500 | 90,900–173,000 | 175,000–6,310,000 |
| TP | 26.0–9,070 | 10,300–22,100 | 22,300–48,000 | 49,200–899,000 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5186
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