Ключевые слова: autumn, background, concrete, construction, culvert, day, design, dirty, drainage, draining, environment, environmental, fallen, flood, flow, flowing, grass, green, ground, gutter, hole, industrial, industry, leaves, material, natural, nature, old, outdoor, pavement, pipe, pollution, prevention, puddle, rainy, river, rock, round, sewage, sewer, storm, stream, surface, system, tube, underground, waste, water, waterproofing,