Ключевые слова: abstract, background, backgrounds, build, building, business, canalization, construction, contruction, craftsmanship, culvert, dimensions, ditch, drain, drainage, ducts, holes, housing, industrial, industry, installation, irrigation, line, manufacturing, materials, piled, pipe, pipes, plastic, plumbing, repair, replacement, round, sewage, sewer, site, stack, stacked, storage, suppliers, tube, tubes, tubular,