Rain gardens have been installed on certain sidewalks throughout Washington, D.C. These landscaped areas are designed to collect rainwater before it gets into storm drains. They prevent storm water from picking up oil, grease, dog waste, and trash and entering into the sewer system, which eventually goes to the Potomac River. By reducing storm water runoff, pollution in the Potomac is reduced. Additionally, these rain gardens are built to have shelter, food, and water for city wildlife. With construction wiping out animal's natural habitats, these sidewalk sanctuaries give animals a place to raise young with safe hiding places inside bushes of flowers and beautiful landscaping, such as hibiscus. These rain gardens also have seats where people can sit back and relax and possibly catch a glimpse of some urban wildlife. These rain gardens are labeled with a sign explaining how the rocks, soil, and plants are designed to stop water.