Abstract
Our objective was to evaluate changes in water quality parameters during 1983–2007 in a subtropical drinking water reservoir (area: 7 km2) located in Lake Manatee Watershed (area: 338 km2) in Florida, USA. Most water quality parameters (color, turbidity, Secchi depth, pH, EC, dissolved oxygen, total alkalinity, cations, anions, and lead) were below the Florida potable water standards. Concentrations of copper exceeded the potable water standard of <30 μg l−1 in about half of the samples. About 75 % of total N in lake was organic N (0.93 mg l−1) with the remainder (25 %) as inorganic N (NH3-N: 0.19, NO3-N: 0.17 mg l−1), while 86 % of total P was orthophosphate. Mean total N/P was <6:1 indicating N limitation in the lake. Mean monthly concentration of chlorophyll-a was much lower than the EPA water quality threshold of 20 μg l−1. Concentrations of total N showed significant increase from 1983 to 1994 and a decrease from 1997 to 2007. Total P showed significant increase during 1983–2007. Mean concentrations of total N (n = 215; 1.24 mg l−1) were lower, and total P (n = 286; 0.26 mg l−1) was much higher than the EPA numeric criteria of 1.27 mg total N l−1 and 0.05 mg total P l−1 for Florida’s colored lakes, respectively. Seasonal trends were observed for many water quality parameters where concentrations were typically elevated during wet months (June–September). Results suggest that reducing transport of organic N may be one potential option to protect water quality in this drinking water reservoir.
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We are thankful to Bruce MacLeod and Mark Simpson of Utility Operations Department, Manatee County Government, Florida, United States, for providing access to water quality data.
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Toor, G.S., Han, L. & Stanley, C.D. Temporal variability in water quality parameters—a case study of drinking water reservoir in Florida, USA. Environ Monit Assess 185, 4305–4320 (2013). https://doi.org/10.1007/s10661-012-2870-z
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DOI: https://doi.org/10.1007/s10661-012-2870-z