Retention basins are designed to manage stormwater runoff by temporarily holding excess water. They help prevent flooding and reduce the risk of erosion by allowing water to slowly infiltrate into the ground or evaporate. These basins are often constructed in urban areas where impervious surfaces, like roads and buildings, increase water runoff. Typically, retention basins are landscaped to blend with the environment and may include vegetation that helps filter pollutants from the water. They play a crucial role in maintaining water quality and protecting local ecosystems, making them an essential component of modern stormwater management practices.