Ключевые слова: abstract, background, business, canalization, cement, channel, concrete, connect, construction, culvert, development, ditch, drain, drainage, ducts, engineering, equipment, factory, hole, industrial, industry, irrigation, manufacturing, materials, pile, piled, pipe, pipeline, pipes, piping, plumbing, repair, ring, round, sewage, sewer, stack, stacked, storage, system, tube, tubes, tunnel, warehouse, water,