Ключевые слова: canalization, communication, concrete, construction, cover, drain, drainage, drainage system, hatch, hole, industrial, infrastructure, installation, laying, maintenance, manhole, pavement, pipeline, purification, purification system, rain, repair, road, roadworks, round, sanitation, septic, septic tank, sewage, sewer, sewer hatch, sewer system, sewerage, sidewalk, street, system, treatment system, underground, waste, wastewater, water, water drain, well, work,