Read here. IPCC global warming scientists and their climate models have been predicting more floods due to human-caused, CO2 warming. Like most predictions by climate model scientists, their predictions are not based on actual scientific evidence. When the proper research was done, scientists discovered that floods occur with significantly more frequency during global cooling periods, such as the Little Ice Age.
"Benito et al. report that the combined palaeoflood and documentary records indicate that past floods were clustered during particular time periods: AD 950-1200 (10), AD 1648-1672 (10), AD 1769-1802 (9), AD 1830-1840 (6), and AD 1877-1900 (10), where the first time interval coincides with the Medieval Warm Period and the latter four time intervals all fall within the confines of the Little Ice Age; and calculating mean rates of flood occurrence over each of the five intervals, we obtain a value of 0.40 floods per decade during the Medieval Warm Period, and an average value of 4.31 floods per decade over the four parts of the Little Ice Age, which latter value is more than ten times greater than the mean flood frequency experienced during the Medieval Warm Period."