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The within lake subbasins are based on the USGS Great Lakes Aquatic GAP aquatic lake units (ALUs) (McKenna and Castiglione, 2010) with modifications made to Lake Superior based on input from the GLAHF classification working group. The subbasins were based on dominate summer circulation patterns and lake bathymetry. For each subbasin, the upstream catchments for the contributing rivermouths were aggregated to create the land contributions areas.
The within lake subbasins are based on the USGS Great Lakes Aquatic GAP aquatic lake units (ALUs) (McKenna and Castiglione, 2010) with modifications made to Lake Superior based on input from the GLAHF classification working group. The subbasins were based on dominate summer circulation patterns and lake bathymetry. For each subbasin, the upstream catchments for the contributing rivermouths were aggregated to create the land contributions areas.