Scientists from the University of Iowa warn that the northern half of the U.S. may be at a rising risk for flooding. The information was published in the journal Geophysical Research Letters. The studies found changes in rainfall patterns and groundwater are possible causes for increased flood risk.
The research showed some evidence to changes in the size of floods and also showed an increasing frequency of flooding. The information was gathered over 30 years from more than 2,000 stream gauges operated by the U.S. Geological Survey. The study compared the stream gauge data to information gathered by NASA satellites. The researchers say extreme precipitation events may happen more often due to more water vapor in the atmosphere. The increased water vapor is caused by higher global and sea surface temperatures.