Where was the biggest flood in the world?

Answer 1

Probably the floods of the Yellow River in China are among the largest in the world, as measured by loss of life. In 1931, the floods killed between 1 and 4 million. In 1887, it killed between 1 and 2 million.

It has a plainland upriver catchment, which stores rainfall, and also supplies huge amounts of yellow silt derived from loess. This load causes the river to be a depositional river, gradually building up the bed of the river, necessitating levees, but which are eventually under attack as the river bed rises.

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The Black Sea may have once been isolated from the Mediterranean during the ice ages when sea levels were low. It is suggested that about 5600BC, the sea levels rose sufficiently to allow the Mediterranean to flood into the black Sea. The flows may have been as much as 10 cubic miles per day for 300 days, but depending very much on the starting level assumptions. There certainly are relict shorelines about 100m below the present sea level.

Possibly ancestral memories of this account for the Noah stories.

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