Ключевые слова: canal, chemical, clean, concrete, conduit, contamination, dirty, drain, drainage, dump, ecology, environment, environmental, flow, flowing, garbage, industrial, industry, infrastructure, liquid, nature, outdoor, pipe, pipeline, plant, polluting, pollution, pouring, river, sewage, sewer, sewerage, shore, smell, smelly, splash, stream, toxic, treatment, tube, waste, waste water, wastewater, water,