I’m not sure exactly what you mean by biggest – but I’m going to go by area and cost rather than by deaths. In terms of America’s history (not prehistoric floods on this continent) the Great flood of 1993 that occurred in the midwest along the Mississippi and Missouri rivers was the most costly and devastating, surpassing even the 1927 flood, what had been the largest ever recorded on the Mississippi, in some categories. Storms and rains continued from April to October in areas that had already had a rainy autumn in 1992 and led to extensive flooding. The flooded area totaled approximately 30,000 square miles.
Please also see previous answer:http://greenanswers.com/q/207999/water-oceans-ice/precipitation/what-biggest-flood-american-history
I’m not sure if you meant in “recorded history” or in history period, so I’ll speak to the later. According to the US Geological Survey (USGS), some of the largest floods on Earth took place in the American Pacific Northwest. During the late-Pleistocene period (between approximately 2.5 million and 12 thousand years ago), the “filling and spilling” of enclosed, inland bodies of water (lakes) resulted in floods of tremendous proportions. One such “basin-breaching” flood was the overflowing of the Pleistocene Lake Bonneville (the ice-age ancestor of the Great Salt Lake in Utah), which released approximately 5,000 cubic kilometers of water.
For more information, including information on other huge floods, see the USGS report linked below.
One thing to consider is very old floods that took place within pre-determined geological formations. For example, the Lake Bonneville Flood in the Pleistocene era (14,500 years ago) in what is today Utah was the result of about 3100 square miles of water spilling out of the Great Basin and into the Snake River at 1 million cubic feet per second. It filled a 100 meter deep canyon!
Click here to cancel reply.
Sorry,At this time user registration is disabled. We will open registration soon!
Don't have an account? Click Here to Signup
© Copyright GreenAnswers.com LLC