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- W64161203 abstract "After the construction of a storm drain designed to carry runoff from the southeastern part of the city of Eustis into Lake Dicie, algal blooms occurred in the lake. In order to determine the nature and extent of these blooms, the quality of both the lake and storm runoff into the lake was monitored from March 1971 through June 1973.Surface runoff makes up about 65 percent of the total input to the lake and the storm drain probably contributes about half of the total input. Average concentrations of the major ions in samples of storm runoff collected from the storm drain were not appreciably different from concentrations found in Lake Dicie. However, the storm runoff contained high concentrations of suspended sediment, nitrogen, phosphorus, lead and other trace elements.Most of the sediment and trace elements and much of the phosphorus carried into the lake by storm runoff were trapped in the bottom sediments. The only appreciable change in the quality of the lake since it was first sampled in 1969 is a reduction in the concentration of phosphorus.The amount of inorganic nitrogen and soluble orthophosphate carried into the lake during this investigation was equivalent to about 3,500 pounds (1,600 kilograms) of 6-6-6 commercial fertilizer. Most of these nutrients were taken up by the large phytoplankton population and eventually incorporated into the bottom sediments in Lake Dicie.During much of the year Lake Dicie is thermally stratified and the water near the bottom becomes enriched with nutrients, particularly nitrogen, from the decomposition of algal cells and other organic matter. In the winter months, the water cools and the lake slowly turns over. The mixing of the nitrogen-rich bottom water with the water in the upper part of the lake where the dissolved oxygen and light penetration are sufficient to support algae often results in explosive algal growth, commonly called a bloom. The two highest concentrations of phytoplankton observed in Lake Dicie during the investigation occurred in December when the lake was not stratified.In Big Bass Lake, a control lake which receives no street runoff, the phytoplankton population is much smaller than in Lake Dicie. Variations in the concentration of phytoplankton appear to be more closely related to rainfall (the major source of nitrogen and phosphorus for Big Bass Lake) than to the seasonal turnover in the lake." @default.
- W64161203 created "2016-06-24" @default.
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- W64161203 date "1974-01-01" @default.
- W64161203 modified "2023-09-26" @default.
- W64161203 title "Chemical and biological quality of Lake Dicie at Eustis, Florida, with emphasis on the effects of storm runoff" @default.
- W64161203 doi "https://doi.org/10.3133/wri7436" @default.
- W64161203 hasPublicationYear "1974" @default.
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