Detail
In order for us to consider the sewer flooding element of Thames Water’s claim, and our counter notice, we asked all water and sewerage companies to provide us with additional comparative information about sewer flooding investment programmes. We asked companies to provide information on the following. The total number of properties which have flooded and are deemed to be at risk of flooding more than once in ten years and twice in ten years at the end of the year. The number of properties added to 1 in 10 and 2 in 10 registers following a flooding incident. The number of properties removed from the 1 in 10 and 2 in 10 registers because of better information. This category includes: changes resulting from better quality information such as improved knowledge of the sewerage system (for example extended modelling, better estimates of figures) properties previously thought to have been at risk but where investigation has subsequently shown the problem to have been caused by reasons other than overloading (for example, a blockage or collapse) properties which were incorrectly identified as being at risk in previous years. The number of properties removed from the 1 in 10 and 2 in 10 registers by company action. We asked companies to provide information for the years 2011-12 to 2014-15, as companies had already reported information to us for 2010-11 in June 2011. Data for 2013-14 and 2014-15 is subject to current company forecasts. We also asked that if a company expected outturn performance to vary significantly from the output allowed for 2010-15 price limits, that it should provide a brief description of the drivers for this. We are grateful for the companies’ co-operation in providing this in a short time frame while they are busy preparing business plans.