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Science 24 June 1977:
Vol. 196. no. 4297, pp. 1448 - 1450
DOI: 10.1126/science.196.4297.1448
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Articles

Great Lakes Eutrophication: The Effect of Point Source Control of Total Phosphorus

STEVEN C. CHAPRA 1 and ANDREW ROBERTSON 1

1 Great Lakes Environmental Research Laboratory, National Oceanic and Atmospheric Administration, 2300 Washtenaw Avenue, Ann Arbor, Michigan 48104

A mathematical model of the Great Lakes total phosphorus budgets indicates that a 1 milligram per liter effluent restriction for point sources would result in significant improvement in the trophic status of most of the system. However, because large areas of their drainage basins are devoted to agriculture or are urbanized, western Lake Erie, lower Green Bay, and Saginaw Bay may require non-point source controls to effect significant improvements in their trophic status.

Submitted on March 10, 1977

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Science. ISSN 0036-8075 (print), 1095-9203 (online)