Detention basins are engineered structures designed to manage stormwater runoff. They temporarily hold excess rainwater, allowing it to slowly drain into the ground or a drainage system. This helps prevent flooding and reduces the risk of erosion in nearby areas. These basins are often constructed in urban environments where impervious surfaces, like roads and buildings, increase water runoff. By controlling the flow of water, detention basins protect local ecosystems and improve water quality by filtering pollutants before they enter natural waterways, such as rivers and lakes.