New England Flood Risk
Collins, M.J. 2009. Evidence for changing flood risk in New England since the late 20th century. Journal of the American Water Resources Association 45: 279-290.
Working with data obtained from 28 streamflow gages of the Hydro-Climate Data Network scattered throughout New England that were not influenced by regulation and had continuous data that spanned at least the last half of the 20th century and continued through 2006, Collins looked for evidence of any trends or step changes that might have occurred over this period.
Averaging 75 years in length, 25 of the 28 streamflow records showed "upward trends via the nonparametric Mann-Kendall test, 40% of which are statistically significant (p < 0.1)," while "an average standardized departure series for 23 of the study gages indicates that increasing flood magnitudes in New England occurred as a step change [italics added] around 1970."
Interestingly, this somewhat rare case of flood risk increase in the United States arrived in the form of a step increase near the end of a 30-year cooling of the globe, about five years prior to the start of the late 20th-century warming that climate alarmists blame for almost everything imaginable that has a negative connotation attached to it. It would be very difficult, however, for them to blame it for Collins' findings.