Backflow Protection

Backflow Protection

Sewer surcharge for both foul and surface water drainage is often overlooked in both Property Flood Protection (PFR) and perimeter protection schemes.

When a flood survey is conducted, the construction and drainage must be considered alongside the risk and client requirements.

At Flood Protection Solutions Ltd we have in-house Civil Engineers who can advise on backflow protection for both residential and commercial projects.

It is best to follow a hierarchical approach. Options are dependent on the drainage configuration, however may include:

  • Full Port Non-Return Valve in inspection chamber
  • Inline Non-Return Valve in pipe
  • Push Fit Non-Return Valve such as Buffalo
  • Wastewater Non-Return Valves
  • Panseal (last resort)


When installing flood barriers or walls etc, it is important to remember that this can create a head of pressure one side of the barrier, which thus encourages backflow through sewerage pipes due to the pressure differential. It is essential that this aspect is considered in any flood mitigation scheme.

Sewer flooding is especially common in built-up areas during heavy rainfall events where the drainage systems can be easily overwhelmed.


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After 4 floods in 16 years, the Water-Gate Barrier was used in November and December 2012. The relief when it prevented what would have been a 5th and 6th flood was enormous. The best part is the piece of mind that follows.

Pam, Nottingham Resident

I would not hesitate to recommend Flood Protection Solutions, a very professional and detailed service.

Neil, Hebden Bridge Resident

The service that was provided was very good, communications were excellent, and they dealt with our issues in a very responsive and professional manner.

Trevor Palmer, Sellafield Ltd