Ключевые слова: clean, climate change, closeup, color image, connection, development, dirty, disaster, drain, drainage, efficiency, emergency, engineering, environment, environmental, facility, factory, flood, flow, flowing, fluid, horizontal, industrial, industry, infrastructure, liquid, maintenance, management, metal, nature, network, no people, old, outdoors, pipe, pipeline, plumbing, pollution, rain, river, sewage, sewer, social issues, stream, tube, water,