The Great Lakes. The Great Lakes are connected to each other through a series of waterways, as described in the following schematic. The numbers r; and 1': represent the ow rates of water into Lake Superior and Lake Michigan, which then feed the other lakes. (We are ignoring the various rivers that ow directly into Lake Huron. Lake Erie and Lake Ontario.) We denote the volume of water in the lakes by V3, V3,, V3, V5, and V0 for Superior, Michigan, Huron, Erie, and Ontario, respectively, and similarly denote the amount of plastic per volume in each lake by 1:3, I\