Broadway Street was once the main street on Longboat Key. Now it’s a main example of incessant flooding on the barrier island.Scott Anderson, a Longboat Key Village resident for 15 years, recalls tearing his drywall out the morning after Hurricane Helene in 2024.“I’ve lived on the beach all my life. I’ve never seen water come up as fast as it came up. It was just a matter of like an hour,” Anderson said.But it doesn’t take a perfect storm like H…