Stormwater runoff occurs when rainwater or melted snow flows over surfaces like roads, parking lots, and rooftops instead of soaking into the ground. This runoff can carry pollutants such as oil, trash, and chemicals into nearby rivers, lakes, and oceans, harming wildlife and ecosystems. To manage stormwater runoff, cities often use techniques like rain gardens and permeable pavement that allow water to soak into the ground. These methods help filter out pollutants and reduce flooding, making urban areas safer and more environmentally friendly. Proper management of stormwater is essential for protecting our water resources and maintaining a healthy environment.