Ключевые слова: channel, concrete, dirt, dirty, down, drain, drop, dump, flood, flow, flowing, garbage, grid, grunge, hole, horizontal, industrial, industry, infrastructure, liquid, open, pipe, pipeline, plumber, plumbing, pour, pouring, purification, recycling, rust, sanitary, sanitation, sewage, sewer, sink, smell, splash, steel, stream, system, toilet, toxic, treatment, tube, tubing, underground, urban, utility, waste,