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Two things are clear about Great Lakes water resources: The first is that the basin community has made great progress in eliminating the most obvious chemical pollution of the basin's tributaries and lakes. The second is that the ecological health of aquatic ecosystems, absent gross chemical or biological pollution, is driven primarily by their flow regime-the magnitude, timing, duration, frequency and rates of change of water movements. A greater understanding and focus on the behavior of moving water is helping to frame new solutions to old problems affecting the ecological integrity of the Great Lakes basin.
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