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Scientific Investigations Report 2007–5186

Scientific Investigations Report 2007–5186

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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

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