Ключевые слова: background, building, business, canalization, concrete, connect, culvert, ditch, drain, drainage, equipment, gray, group, heap, hole, housing, identical, industrial, industry, irrigation, large, material, municipal, new, object, pile, piled, pressure, production, reinforced, repair, ring, road, round, section, sewage, sewer, site, storage, tube, urban, warehouse, water, yard,