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Environmental Protection Agency, have been grouped into nine series These nine broad cate- gories were established to facilitate further development and application of en- vironrnentai technology Elimination of traditional grouping was consciously planned to tostei technology transfer and a maximum' interface in related fields. Problems are assessed for their long- and short-term influ- ences Invest ga'ions include formation, transport, and pathway studies to deter- the fate of pollutants and their effects.

This work provides the technical basis for setting standards to minimize undesirable changes in living organisms in the aquatic, terrestrial, and atmospheric environments. Problems are assessed for their long- and short-term influ- ences Invest ga'ions include formation, transport, and pathway studies to deter- mine the fate of pollutants and their effects.

This document is available to the public through the National Technical Informa- tion Service, Springfield.

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Environmental Protection Agency, and approved for publication. Approval does not ify that the contents necessarily reflect the views and policies of the Persomals. Environmental Protection Agency, nor does mention of trade names or commercial products con- stitute endorsement or recommendation for use. Of all the Great Lakes, Lake Erie has been stressed to the furthest extent as a result of man's activities.

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This report provides an insight into the processes that go on within Lake Erie and our attempt to describe them. As we better describe the processes that go on within the Great Lakes, we will be in a better position to understand and predict the management of Great Lakes systems. The objective of the study was to determine recent trends in lake eutrophication and water quality which may be related to recent attempts to control nutrient loadings to these basins.

The assess- ment was accomplished by visiting approximately 50 stations at nearly monthly intervals during the ice-free periods. Over 25 water quality, meteorological and biological parameters were routinely determined shipboard or on samples collected at a typical station. Measurements were taken at several depths in order to characterize the various strata of water in the lake and to permit volume-weighted calculation of nutrient concentrations and quantities.

Data from limno- logical surveys as far back as were compared with the of the present study to establish long-term trends, as well as recent trends since the last comprehensive survey in The fundamental conclusion of this assessment is that during the first half of this decade no ificant decrease in the loading of nutrients to Lake Erie has taken place.

Therefore, during this period the con- centrations and quantities of nutrients within the waters of the lake have remained relatively stable. An encouraging of nutrient control is that although no decreases have been observed, the constant increases which have taken place in preceeding decades have been stopped.

Other indicators of eutrophication, such as hypolimnetic oxygen depletion rates, chlorophyll concentrations, methane production, plankton and benthos populations, dissolved solids and turbidity, have remained high since but also relatively stable.

Most of the nutrient loading to Lake Erie occurs in the western basin. The largest quantity Is delivered by the Detroit River, but the highest concentrations were observed near the mouth of the Maumee River. The western and central basins are effective sinks for nutrient loading; approximately 82 percent of the phosphorus carried to the lake by the tributaries remains in bottom sediments. Up to 10 percent of the phosphorus delivered to the lake can be regenerated under anoxic conditions. However, physical regeneration due to storm resuspension of sediment can have a larger impact on internal nutrient loading, par- ticularly during non-stratified periods.

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For example, in light winds during the period of thermocline formation resulted in a thicker hypolimnion in the central basin. This increased reservoir of oxygen reduced the area of anoxia by over 95 percent and thereby decreased the amount of regenerated phosphorus from the sediments by over 70 percent from the two years. Also, because of high concentrations of nutrients in the lake, particularly the western basin, the limiting factor in algal production appears to be sunlight.

Pre- cipitation also plays a role in nutrient concentrations; high rainfall in the early 's over the upper Great Lakes basins resulted in record-high flow rates in the Detroit River in and The concentration of nutrients, although not the quantity, was lowest dur- ing this period from dilution by excessive precipitation.

Although the effectiveness of nutrient controls in reversing eutrophication in Lake Erie cannot be demonstrated, the halting of further degradation is an important first step. Also, many new treatment facilities are just now being placed in operation. Modifi- cations in agricultural practices will reduce the loading of nutrients to the tributaries, but these changes will not be reflected in water quality improvements for several years due to the slow migration of sediment to the lake.

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It is important that this start at improving the conditions of Lake Erie be continued and that new methods of lake restoration be explored. This report was submitted in fulfillment of Grant No. Environmental Protection Agency. This report covers a period from June 15, to June 14, and work was completed as of April 27, Herdendorf 1 2. Taft 64 3. Pliodzinskas and E. Feder and John E.

Zapotosky vii FIGURES 1 stations location map for the central and adul basins of Lake Erie 4 2 Schematic representation of sampling depths in Lake Erie 12 3 Water quality grids used for area- and volume- weighted calculations in the central and western basins of Lake Erie14 4 Trends in anoxic hypolimnion of Lake Erie 16 5 Relationship between dissolved oxygen concentrations in the lower hypolimnion of central Lake Erie and soluble reactive phosphorus regeneration, cruises 7 and 8, August September 5.

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