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Message: <blockquote data-quote="Barcode" data-source="post: 915716" data-attributes="member: 3165">Fun with Terraforming!I have a desire in my game world, which is based on a far-future North America, to have a large inland sea where the Great Lakes currently are.  Basically, I would like to have the majority of the lakes be internavigable with medieval tech-level ships, generating a large naval commerce area without the need for canals or overland portage.  My little map shows that Superior, Huron, Michigan and Erie are all very close in elevation (600, 581,581, and 571ft respectively) whereas Ontario is significantly lower (246ft).What would it take to bring the first four lakes all to the same elevation, say 600ft?  Would damming the Niagara River accomplish this?  How about just raising Erie 10 feet?What would be the effect on the surrounding land areas?  How much of Michigan, Ontario, Ohio, Wisconsin etc... would end up under water?  Is the terrain in any of those areas hilly enough to create a cool archipelago?What would be the effect on Chicago if Lake Michigan rose 19 feet?  Is the natural terrain hilly at all?  A Venice-like scenario would be pretty cool.I have a long period of undefined and unknown history, where major applications of technology or magic can explain away any necessary measures to affect the changes, but the natural landscape is likely to remain constant, and current technological artifacts, such as the Welland Canal, can be assumed to have been reclaimed by Nature.Thoughts?</blockquote>

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