USGS

Sources, Instream Transport, and Trends of Nitrogen, Phosphorus, and Sediment in the Lower Tennessee River Basin, 1980-96

Figure 20. Temporal variation in nutrient concentrations during 1980-96 and model estimate of trend at selected sites in the lower Tennessee River Basin for (A) total nitrogen, (B) total nitrite plus nitrate, (C) total ammonia, and (D) total phosphorus.

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Figure 20. Temporal variation in nutrient concentrations during 1980-96 and model estimate of trend at selected sites in the lower Tennessee River Basin for (A) total nitrogen, (B) total nitrite plus nitrate, (C) total ammonia, and (D) total phosphorus--Continued.

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