retention basin

A retention basin is a specially designed outdoor basin or pond that temporarily holds and stores excess rainwater or stormwater during heavy rainfall. Its purpose is to prevent flooding, reduce runoff, and improve water quality by allowing sediment and pollutants to settle before the water is gradually released into natural waterways or drainage systems. Retention basins are often features in urban or development areas to manage stormwater effectively, protect infrastructure, and support environmental health. They are typically landscaped and maintained to blend into the environment while performing their water management function.