Lake Agassiz was a very large glacial lake in North America that discharged into the Atlantic Ocean just as Lake Missoula, further west, emptied into the Pacific.
Studies in 2003 by a team led by Garry Clarke a geophysicist at the University of British Columbia reported that “Lake Agassiz, reached a massive 163,000 cubic kilometres in volume—at least double that of the largest contemporary lake, the Caspian Sea—and concluded that its release was ‘by far the largest known glacial outburst of the past 100,000 years.’ The report dates the event at about 8,500 years ago.” (b)(c)
A few years later studies of the effects of these Agassiz discharges found a correlation between the Canadian flood and the sudden development of European farming(a). Chris Turney of the University of Exeter has linked this event with the migration of up to 145,000 people from the Black Sea farming sites to inland Europe.
(c) Atlantis Rising magazine #42 p.10 http://www.pdfarchive.info/index.php?pages/At