**Polyhedral composite pipes and sections can use for reconstruction:**

- urban networks of domestic and storm sewage
- municipal networks of underground rivers and streams
- city drainage water intake and drainage systems
- sewage networks of large enterprises
- water pipelines of nuclear, thermal and hydroelectric power stations
- culverts of railways and highway

**Polyhedral composite pipes can use for the construction of new modern underground reservoirs, conduits, tunnels, wells, tanks, etc.**

**Networks of underground sewerage in cities are very long, about 10% of them are a large-diameter collector.**

**The length of the sewage networks of large cities:**

__Moscow__: household sewerage more than 8760 km.__St. Petersburg__: household sewerage about 8800 km, tunnel manifolds – 270 km.__Novosibirsk__: household sewerage 1150 km, tunnel sewers – 100 km.__Kiev__: domestic sewerage more than 3000 km.__Kharkov__: household sewerage 1660 km., tunnel collectors – 56 km.__Lviv__: household sewerage is 765 km.__Odessa__: household sewerage about 680 km.__London__: only the Bazalgette system consists of 1,100 miles of street sewage and 82 miles of main sewerage networks. Built-in 1855.__Berlin__: a combined sewage system with a total length of 1,900 km built-in 1873. The__Berlin sewage drains__have a distance of 9,600 km.__Prague__: the length of the sewerage system was more than 4,500 km.__Paris__: In 1805, the construction of 182 new miles of sewerage, today Sewerage extends for 1,300 miles.__Vienna__: the length of about 2500 km. Construction started in__1837__.__Krakow__: sewerage system approx. 1858 km.- In
__Brussels__, there are about 1500 kilometres of sewer networks, which now require serious attention. __Hamburg__: is about 5,800 kilometres. Construction started in 1842.__Frankfurt-on-Main__: an extensive public sewage network with a length of about 1600 km.