Sewer grates are metal covers that sit over openings in the ground, allowing rainwater and wastewater to flow into the sewer system. They help prevent debris, such as leaves and trash, from clogging the drainage system while allowing water to pass through. These grates are typically found on streets and sidewalks, designed to be strong enough to support the weight of vehicles. They come in various shapes and sizes, often featuring a grid pattern to ensure proper drainage. Regular maintenance is essential to keep them clear and functioning effectively, preventing flooding and other drainage issues.