Ключевые слова: abandoned, channel, concrete, danger, dirty, drain, drainage, draining, ecology, environment, flooded, flow, flowing, human, industrial, inside, labor, leak, leakage, man, manhole, mounter, outflow, person, pipe, pipeline, poison, pollution, professional, protective, repair, round, safety, service, sewage, sewer, sewerage, smelly, stink, stream, toxic, tube, tunnel, tunneler, underground, uniform, wastewater, water, work, worker,