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Worldbuilding

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    $\begingroup$ Also rivers and lakes that freeze damming water behind them to be released in flood. $\endgroup$
    – KalleMP
    Commented Nov 12, 2018 at 18:10
  • $\begingroup$ The Seine river in France is probably not a good example: it is known to have rare but somewhat regular large floods: en.wikipedia.org/wiki/Seine#Flooding "A 2002 report by the French government stated the worst-case Seine flood scenario would cost 10 billion euros and cut telephone service for a million Parisians, leaving 200,000 without electricity and 100,000 without gas" $\endgroup$
    – Autar
    Commented Nov 13, 2018 at 10:37
  • $\begingroup$ @Autar I linked a data source. Please compare the Seine with rivers of comparable size. Its flooding is less severe than seen on the Moselle, Oder or Neckar, for example. $\endgroup$
    – kingledion
    Commented Nov 13, 2018 at 12:12
  • $\begingroup$ @kingledion Depends on how you measure it. In terms of water flow or frequency sure, but the 1910 Paris flooding had water nearly 9 meters above normal levels. In 2016 and 2018 it was above 6m. I would think this makes it unsuitable for the question. Anyway that was more of a side comment, I think your answer is great and your information source very appropriate. $\endgroup$
    – Autar
    Commented Nov 13, 2018 at 13:18
  • $\begingroup$ Awesome answer! Very, very minor nitpick: The river that borders Northern Michigan and Ontario is the Saint Mary's (or Marys) River, sometimes also shortened to St. Mary's River. $\endgroup$
    – zmerch
    Commented Nov 14, 2018 at 15:18