ELI5: Explain Like I'm 5

Sustainable Flood Retention Basin

A sustainable flood retention basin is like a pond that holds extra water when it rains a lot. The water gets held in the basin and then slowly released so that it doesn't cause flooding in other areas. The sustainable part means that the basin is designed to prevent flooding, but also to protect animals and plants that live in or around it. It's like a pond that is safe for the environment and that helps reduce flood risk.