humble pie rat
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This is how I understand it, please correct me if I'm wrong.
Lake Superior's level is controlled by the St Mary's River, which is pretty shallow and so will only allow Lake Superior to drop a few feet.
Lake Huron and Lake Michigan more or less have the same level, being joined at the relatively wide and deep straits of Makinaw. Their level is not controlled to the same degree as Superior since the St Clair River that drains them is 70 or 80 feet deep and these lakes are therefore subject to wider variations in water levels.
The minimum level of Lake Erie is dictated by the height of Niagara Falls which isn't changing very much any time soon. The fluctuations in depth of Lake Eerie are due to the variation in what Lake Huron and Lake Michigan send it. The viariation in depth of Huron and Michigan are pretty much directly translated to Lake St. Clair and Lake Erie.
Lake Ontario levels are being controlled to maintain the level in the St Lawrence. Hence, since the 1950's, it's level has been fairly constant.
There are 10 kinds of people. Those who understand binary and those who don't.
Last edited by CapnHand; 11-13-2007 at 12:37 PM.