It’s the worst disaster in four years. Parts of the state saw more than 31 inches of rain and at least 11 people died in the resultant flooding. Now the 30,000 who were rescued from the waters are returning to find their homes devastated. Thousands of houses are without electricity, and rescue teams are going door to door to offer aid. Scientists say they’d thought floods on this scale came only once every 500 years — but this is the eighth such event worldwide since May 2015, an acceleration attributed to climate change.