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An Assessment of Flows for Rivers of the Great Lakes Basin

Summary: An Assessment of Flows for Rivers
of the Great Lakes Basin
David Allan and Leon Hinz
With: Edward Rutherford, Paul Seelbach and Michael Wiley
School of Natural Resources & Environment
The University of Michigan
Ann Arbor MI 48109-1115
Final Report to the Great Lakes Protection Fund
October, 2004
We gratefully acknowledge the assistance of Stuart Eddy and the Great Lakes
Commission. We thank Martha Carlson, Sarah Greene, Dana Infante and Jennifer
MacKay for their assistance with analyses, and LeRoy Poff for analytic advice.
Executive Summary
River flows, typically measured in cubic meters or cubic feet per second, vary in the
magnitude, duration, and frequency of flow events, in the predictability of their timing,
and in their rate of rise and fall. A hydrograph, or plot of discharge vs. time (often, days)
depicts these changes visually. Variation in river flow can be quantified using a variety
of statistical methods, providing a description of the flow regime of a river or river
segment. Flow regime in unaltered rivers is a function of climate, geology, vegetation


Source: Allan, David - School of Natural Resources and Environment, University of Michigan


Collections: Environmental Sciences and Ecology