Ключевые слова: asphalt, bar, black, cement, city, concrete, construction, culvert, design, dirty, ditch, down, drain, drainage, flood, floor, flow, flowing, garbage, grate, ground, gutter, hole, line, maintenance, manhole, mesh, old, pavement, prevention, rain, rusty, sewage, sewer, steel, stone, storm, surface, system, urban, waste, waste food, wastewater, water, wet,