Iowa flooding will become more frequent and severe


Flood 2008
Photo of 2008 flood by Jon Fravel, Flickr

Tyler Chalfant | September 10th, 2019

Iowans across the state experienced severe flooding this year, and according to a report released Thursday by the Iowa Policy Project, flooding events like those of 2019 will likely become more frequent and severe as the climate changes. While temperatures and precipitation have been shown to be rising, flooding patterns are harder to predict, but this year’s “100-year flood” seems to be the fourth flooding event of its kind in only 30 years, following severe floods in 1993, 2008, and 2011.

Both the Mississippi and Missouri River Basins flooded this year, with the Mississippi breaching a levee in Davenport, and the Missouri breaching every levee south of Council Bluffs on the western side of the state. In addition to the damage caused to flooded roads, homes, and businesses, these floods have harmed agriculture. Farmers were forced by flooded fields to plant late or not at all this year. The floods spoiled stored crops, caused the deaths of livestock, and damaged farm infrastructure. Flooding and extreme heat also pose a threat to human health through contaminated water supplies, the spread of disease-carrying insects, and harm to mental health. 

The period from May 2018 to April 2019 set new records for precipitation in the Midwest, with Iowa exceeding the regional average with over 50 inches. Since the 1970s, Iowa’s average annual rainfall has been rising by 1.25 inches per decade – the highest rate of any state in the country – and snowfall this February reached three and a half times the recent average. Springtime rainfall in the upper Mississippi is projected to increase 20 to 40 percent. The report also covered temperature increases, which are projected to be the highest in the Midwest during the warm season. 

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