Ключевые слова: asphalt, background, city, construction, cover, drain, drainage, environment, flood, grate, grid, grille, grunge, gutter, hole, industrial, iron, maintenance, manhole, metal, old, outdoor, pavement, paving, paving stones, rain, road, rusty, sewage, sewer, sidewalk, steel, stone, street, surface, system, texture, underground, urban, water,