We're working to reduce the risk of sewer flooding in Oxford.
Work so far
The Oxford drainage system comprises, almost exclusively, separate foul water and surface water sewers. Despite this, we have observed storm responses within the foul network suggesting that the network is not completely separate.
In addition to this it is widely known that Oxford suffers from fluvial flooding and ground water flooding both of which can have an impact on sewerage system through infiltration and direct ingress. We are working closely with the EA and the councils to understand and quantity the benefits of schemes that may impact on our network, such as the Marston F.A.S and Oxford F.A.S.
Our current position with regards to the performance of the foul sewers is that flooding is primarily a result of operational issues such as sewer blockages.
However there are areas where our sewers are overloaded during significant rainfall events - for example the Campbell Road area of Iffley. We are investigating increasing the sewer capacity to address flood risk in this area.
In addition to this, the study will also aim to assess the impact of proposed future development trends (up to 2040) in order to assess and mitigate any detriment on the performance of the sewerage system.
We are also undertaking a trunk sewer investigation that includes assessment of the impact of Littlemore SPS on the network aiming to improve the performance of the pumping station and better utilise the capacity of the trunk sewers.