Which of the following is an example of a structural BMP?

Detention basins exemplify a structural Best Management Practice (BMP) because they are specifically designed to manage stormwater runoff by temporarily storing excess water. They help to mitigate flooding, reduce peak runoff rates, and improve water quality by allowing sediment and pollutants to settle before the runoff is released downstream. This physical structure plays a key role in stormwater management systems by controlling the quantity and quality of water being discharged, thereby protecting local waterways.

In contrast, rain barrels and vegetative swales are classified as non-structural or vegetative BMPs, which primarily rely on natural processes and management practices instead of engineered facilities. While permeable paving involves structural elements, it is often categorized differently in terms of its function and application, focusing more on allowing infiltration rather than providing storage capacity like a detention basin does.