Flood Surveys by qualified industry professionals
Backflow protection is now more vital than ever, with sewer surcharge an ever increasing risk, particularly in built up urban areas where drainage systems are overwhelmed by short bursts of heavy rainfall, as witnessed in the July 2021 London Floods.
What is Sewer Surcharge?
“Sewer backflow” refers to the movement of sewage or wastewater against intended flow. Water can back up into homes or other properties that are connected to the sewer system when the public sewer system is backed up or overloaded.
Sewer surcharge is a particular risk to below ground properties, such as basement flats. This is because the invert level of their drainage connection is usually close to the main sewer, and when the system surcharges they are often the lowest point for water/sewage to backflow out of and alleviate pressure in the system. When a sewer system is overloaded, it may overflow into a building.
Sewer backflow can be a severe issue, not just from the immediate flooding issue, but also because it can spread pathogens and harmful bacteria, potentially putting occupants’ health at danger. Additionally, it may harm property. Consequently, it is crucial to take action to help prevent sewage backflow.
Sewer surcharge can also occur in flood mitigation schemes where other Property Flood Resilience (PFR) measures have been installed. If a flood barrier is installed, this can create a head of pressure one side of the barrier, effectively encouraging sewer surcharge through the artificially created pressure differential. It is vital to understand the drainage layout at the site, prior to investigating management options, such that they can be designed and located correctly. A Drainage Survey may be require prior to the installation of backflow measures.
Whilst our main capacity is in assessing drainage systems and designing/specifying the correct non-return valves, we can also assist in overseeing installation works to ensure they are performed correctly.
Click on the image below to watch our very own Simon Crowther explaining all about Drainage Backflow and Sewer Surcharge
FPS Environmental were great to work with. They responded immediately to my initial enquiry and followed up quickly with a quote. A very friendly, efficient and professional service. Thanks!
Karen was a pleasure to deal with and entirely professional. Thanks!
FPS completed a flood risk assessment for me. Really helpful company. Very flexible with the many amendments needed! The final report is excellent.
Good to work with, Karen always helpful, and provided a detailed and professional report in a timely fashion.
Excellent phone based advice on a prospective property purchase.
“Simon is a very experienced flood protection specialist. He was very professional and knowledgeable in his services.”
“The survey and report were very thorough and really gave me what I needed”
“The report is professional and informative, as indeed were the two surveyors who attended our property”
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FPS Environmental Ltd, Unit 36, Criftin Enterprise Centre, Oxton Road, Epperstone, NG14 6AT
FPS Environmental Ltd, Kemp House, 152-160 City Road, London, EC1V 2NX
Phone020 8050 3194