Ключевые слова: abstract, air, background, build, city, cold, conduit pit, copy space, cover, damage, daytime, drain, emergency, energy, environmental, escape, frost, gas, grate, grey, hatch, heat, heat loss, hole, hot, infrastructure, inspection, lid, manhole, metal, pavement, pollution, pressure, road, sewer, sewer manhole, sidewalk, smoke, steam, steel, street, surface, technology, typical, urban, vapor, wet, white, winter,