Okay kiddo, let me explain what "managed retreat" means in a way that's easy for you to understand.
You know how sometimes when there's a big storm or flood, the water can come up really high and cover everything? Well, when that happens, it can be really dangerous for people who live near the water. So, sometimes they decide to move away from the water to keep themselves safe.
When people move away from the water on purpose, that's called "managed retreat." It's called that because they're doing it in a planned and careful way, instead of just leaving in a panic.
Managed retreat can be a good idea if people are living in a really dangerous spot, where they're likely to be flooded or hurt by storms. Sometimes, it might mean that whole neighborhoods or even towns have to move away from the water.
But, it's not always easy to move away from where you live. People might have to find new homes, new jobs, and make new friends. That's why it's important to plan things out and make sure people are safe and supported when they make the move.
Overall, managed retreat is a way to help people stay safe from dangerous floods and storms. It might be hard, but it can help people protect themselves and their families from harm.