Investigation and research
We've examined the causes of sewer flooding in the Counters Creek area to help us design the most sustainable and affordable programme to reduce the risk of sewer flooding.
In 2007-10 we contacted over 6,000 properties and conducted 3,000 door-to-door surveys where we checked basements and sewers in the area.
This research helped us to build a hydraulic model of the catchment and understand how rainfall across London affected storm flows in the Counters Creek sewer catchment.
To support this investigation, an independent advisory group was formed – a panel of independent experts from industry and academia – asked to objectively challenge and scrutinise our work to develop a solution to the problem.
Running alongside this period of research we worked to protect customers most at risk.
Between 2007 and 2016 we installed over 1200 anti-flooding devices, started work on our two year SuDS pilot scheme with the Royal Borough of Kensington and Chelsea and the London Borough of Hammersmith and Fulham and worked on developing the design and feasibility for a proposed major network improvement project.
In our business plan submission to our regulator, Ofwat, in 2014 we outlined our plans to protect the catchment from sewer flooding and committed to delivering protection to those customers most at risk.
Between 2015 and 2017 we have been developing our plans for the Counters Creek flood alleviation scheme.
We completed the installation section of the three SuDS retrofit pilots, in collaboration with the Royal Borough of Kensington and Chelsea and the London Borough of Hammersmith and Fulham.
We also held several rounds of engagement and consultation with our customers over our plans for a major strategic sewer and get their feedback. With our preferred sites in mind we were also in discussion with Tideway about our proposed drive site for the storm relief sewer at Cremorne Wharf.
In late 2016 the decision was made that joint working at our preferred drive site was not a feasible option, and therefore our plans for building a strategic asset would be delayed until 2021. Because of this delay, the feedback from our customers and new data from storms in 2016, we reviewed the scheme proposal and decided to create a new one. This new proposal focuses on protecting those who have reported flooding to us and remain at risk of future incidents.
Our new proposal for 2018 to 2020 is to protect all of those customers who have reported sewer flooding to us since 2007 within the Counters Creek catchment area.
We are committed to reducing the risk of sewer flooding and want to investigate all reports and install local level protection for those who want it at all properties by 2020.
We will continue to research and investigate the need and options for a strategic storm relief sewer to see if it is necessary taking into account population growth, development, urban creep and climate change.
Keeping you informed
Every six months we hold meetings in Hammersmith and Kensington Town Halls where residents and interested parties can hear about our research and our plans to protect basement properties from flooding.