Applications # 2006 Washington DC
In common with most other major cities around the world, London has grown outwards from the centre as its population has increased. What may not be appreciated is that this holds true not only for the roads and buildings but also for the buried infrastructure, particularly the water mains and sewers, which were the first utilities to be installed. This has resulted in the present situation where over half of the water mains in London are over 100 years old and a third are over 150 years old. Thames Water has embarked upon a programme to replace 1235 kilometres (772 miles) of these pipes over the 2005 – 2010 AMP (Asset Management Plan) period at a cost of £500 million ($800 million). This paper will describe the rationale of a work targeting strategy, pipeline system selection and provide illustrations of the problems and solutions of carrying out a major mains replacement project in a congested urban area.