Abstract
Environmental management programs designed to restore and preserve Great Lakes water quality require identification and control of pollutants derived from both point and nonpoint sources. Nonpoint pollution problems are tied to the landscape and to surficial processes. Man-induced changes in local rainfall and runoff are also possible which can increase the importance of local nonpoint sources of pollution. The percent of diffuse sources of phosphorus was found to constitute a significant part of the total loads, which contained important contributions of nonpoint tributary and atmospheric sources. The evidence is abundant that water quality degradation has occurred through time from point and nonpoint sources and impaired some uses of the Lakes. The downcutting and headward migration of the Niagara River gorge would in time cause a drop in the level of Lake Erie and, in time, reduce levels of all upstream lakes, and produce headward stream erosion.
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