Major Historic Floods and Their Toll

The single deadliest natural disaster in recorded history is generally considered to be the 1931 China floods, which struck the Yangtze and Huai River basins after a winter of heavy snowfall was followed by unusually intense spring and summer rains, including seven successive cyclones that brought torrential rainfall to the central Yangtze in July 1931 alone. Estimates of the death toll vary considerably depending on methodology and on whether famine and disease deaths in the disaster's aftermath are included, but frequently cited historical figures, including those compiled by geographer Chan Kwok Bun and disaster historians such as Kathryn Edgerton-Tarpley, range from roughly 1 million to as high as 4 million deaths, with the lower, more narrowly defined estimates of direct drowning deaths still numbering in the several hundred thousand; the flood inundated an area estimated at over 180,000 square kilometers, displacing tens of millions of people across Hubei, Anhui, and Jiangsu provinces. A comparably catastrophic Yellow River flood struck in 1887, when the river breached its dikes near Zhengzhou in Henan province, inundating an area historians estimate at over 50,000 square kilometers and killing, by most historical estimates, between 900,000 and 2 million people through drowning, subsequent famine, and disease — a toll that reflects both the Yellow River's notoriously high sediment load, which raises its bed above the surrounding plain as described in the floodplain-geography module, and the density of agricultural settlement on the North China Plain it traverses.