Michael Miner's excellent overview of the issues involving Great Lakes water resources ["They Need It. We Waste It," January 13] left out one pertinent fact: 90 percent of all the water in the five lakes is the result of runoff from receding glaciers during the time when the Ice Age ended. Thus in the intervening 10,000 years only 10 percent of the water volume of the Great Lakes is due to rainfall and inflow from rivers and streams.
The inadvisability of any large-scale diversion of Great Lakes water to both future freshwater supplies and to
commercial navigation is obvious. All of us who are residents of the Great Lakes basin, whether Canadian or American, should take an active role in advocating for the passage of the Great Lakes-Saint Lawrence River Basin Water Resources Compact by contacting our respective elected representatives.
PS: This is not a new issue. While vacationing in a number of western states in 1982 and 1984 (both election years) I read and heard of a number of candidates for public office who advocated diverting Great Lakes water to the west. One proposal envisioned the construction of a pipeline from the western tip of Lake Superior at Duluth, Minnesota, that would supply water to the Dakotas, Montana, and Wyoming.