Ключевые слова: canal, clean, clear, concrete, danger, dirty, drain, drainage, drains, dump, ecology, environment, environmental, flow, flowing, fluid, garbage, green, ground, industrial, industry, irrigation, liquid, natural, nature, old, outfall, pipe, pipeline, pipes, plant, pollution, pouring, reservoir, river, round, rusty, sewage, sewer, storm, stream, system, toxic, tube, waste, wastewater, water, white,