Publisher's Synopsis
Excerpt from The Effects of Regulated Lake Levels on Beaver in Voyageurs National Park, Minnesota
The present water management is under the control of the International Joint Commission (ijc), the organization responsible for managing waters shared by the United States and Canada since its formulation in 1909. Under the present water management system water levels are kept within a band of acceptable values for certain times of the year, called a rule curve (fig. The present rule curve encompasses a range of maximum and minimum values allowing some leeway in water levels. The general yearly pattern begins in June when high water is reached about a month after natural dates (mid-may), and remains largely stable throughout the summer. In September water levels gradually decline, continuing through the winter and reaching the lowest level from mid to late March (fig. Much of the yearly fluctuation (2 meters) occurs in winter.
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