The Federal Emergency Management Agency on Friday unveiled the details of an overhaul to its beleaguered National Flood Insurance Program, the initiative’s first major update in 50 years. Most homeowners in the program will have lower or stable premiums, but roughly 11% of homes—largely the highest value ones—will see increases in premiums of at least $10 a month. Those could continue to rise until they reach a cap of $12,000 a year.