There should be places in the 'deep' watershed that are getting their water from somewhere else. Or how about the Great Lakes? I doubt Lake Superior has the sa

There should be places in the 'deep' watershed that are getting their water from somewhere else. Or how about the Great Lakes? I doubt Lake Superior has the same stuff in it as Lake Erie, should be easy enough to poke with a stick. There could certainly be some subtle underlying factor, but the food supply has grown continuously for like 80 years at this point, maybe it's just marketing and availability.