Ключевые слова: concrete, construction, dam, danger, dirty, disaster, drain, drainage, ecology, environment, equipment, flow, flowing, garbage, grassgreen, green, greenpeace, grunge, industrial, industry, large, lines, liquid, modified, nature, outdoor, pipe, plant, polluting, pollution, pouring, production, river, rural, rust, sewage, sewer, sludge, storage, stream, system, technology, treatment, tropical, tube, urban, waste, wastewater, water, wet,