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An Analysis of the Trophic State of Clinton Lake

Shih H. Wang, Donald G. Huggins, Frank deNoyelles, Werner S. Kolln

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Abstract

The trophic state of Clinton Lake was assessed. Typical longitudinal gradients were observed with nutrient concentrations (TN, TP, NO3-N, NH4-N, PO4-P) decreasing from the riverine areas of the reservoir to the main basin. The TN:TP ratio went from 6.7 in the riverine zones to 14.2 in the main basin. The reservoir was eutrophic according to all the criteria assessed. Using growing season means for the main basin: chlorophyll a = 16 μg·L−1 > 10 μg·L−1, TP = 39 μg·L−1 >20 μg·L−1, TN = 0.52 mg·L−1 > 0.50 mg·L−1, Secchi disk depth = 1.13m < 2 m. Practices aimed at reducing phosphorus and sediment loadings are suggested to improve water quality.

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The trophic state of Clinton Lake was assessed. Typical longitudinal gradients were observed with nutrient concentrations (TN, TP, NO3-N, NH4-N, PO4-P) decreasing from the riverine areas of the reservoir to the main basin. The TN:TP ratio went from 6.7 in the riverine zones to 14.2 in the main basin. The reservoir was eutrophic according to all the criteria assessed. Using growing season means for the main basin: chlorophyll a = 16 μg·L−1 > 10 μg·L−1, TP = 39 μg·L−1 >20 μg·L−1, TN = 0.52 mg·L−1 > 0.50 mg·L−1, Secchi disk depth = 1.13m < 2 m. Practices aimed at reducing phosphorus and sediment loadings are suggested to improve water quality.

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Available abstract

The trophic state of Clinton Lake was assessed. Typical longitudinal gradients were observed with nutrient concentrations (TN, TP, NO3-N, NH4-N, PO4-P) decreasing from the riverine areas of the reservoir to the main basin. The TN:TP ratio went from 6.7 in the riverine zones to 14.2 in the main basin. The reservoir was eutrophic according to all the criteria assessed. Using growing season means for the main basin: chlorophyll a = 16 μg·L−1 > 10 μg·L−1, TP = 39 μg·L−1 >20 μg·L−1, TN = 0.52 mg·L−1 > 0.50 mg·L−1, Secchi disk depth = 1.13m < 2 m. Practices aimed at reducing phosphorus and sediment loadings are suggested to improve water quality.

Key concepts: Eutrophication, Trophic level, Structural basin, Environmental science, Trophic state index, Secchi disk, Water quality, Hydrology (agriculture)

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