RENOVERING AV VA-LEDNINGAR / Renovation of Water Conduits and Sewers
Relaying water conduits and sewers in the conventional manner is an extremely expensive operation. In the central parts of Stockholm the price of relaying pipelines per metre is normally SEK 10,000. Although on the outskirts of the city the corresponding price is admittedly lower, somewhere about SEK 5,000, this too may be considered high in relation to the degree of utilization. There are recent examples in the outer parts of the city where the cost per property amounts to SEK 70,000, though the working conditions hardly could be regarded as particularly difficult. The properties involved are nearly always houses with such low consumption that a normal annual water rate is about SEK 1,500, approximately 10 % of which can be allocated for the maintenance and rehabilitation of the local network. Stockholm has some 5,000 km of water supply conduits and sewers. This means that with a lifetime of 100 years, which is optimistic, 50 km should be relaid every year. “Complete abstract not presented.”