Flooding within a watershed, or riverine flooding, is another common form of inland flooding. Like flash flooding, riverine flooding is generally caused by rainfall or runoff that is too heavy to be absorbed into the watershed, sending the water over the bounds of the river or stream's banks and inundating nearby flood plains. Unlike flash floods, they build slowly, over a period of many hours or days, and last for a longer period of time, often more than a week, and sometimes over a month. Flooding along the Mississippi River Valley in 1993 lasted for 45 days, with some areas still partially flooded for 183 days; a flood event in Bangladesh in 1998 lasted for 68 days before finally receding.
Riverine flooding tends not to be as deadly as flash flooding, but causes great damage to property and agricultural lands, as was seen in the Mississippi Valley floods of 1993. High water displaced 70,000 people in nine states, damaged 50,000 homes, destroyed 12,000 acres of farmland, and caused an estimated $15 billion in losses.
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