KNOWLEDGE BASE

Flood defence wall case story

Pixham House flood defence case story

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Introduction from Nick Lupton

Following a BBC news story filmed during the January 2024 floods and the subsequent media interest in the flood defence wall we built, many people have been in touch, expressing interest in what we did and how we did it. They want to know what they need to consider to build a flood wall themselves. With that in mind, I decided to document what we did and the challenges we faced as a helpful guide from the perspective of a non-construction professional. Furthermore, what would we have done differently with the experience we have now? It is something I wish I had before we started, as it would have saved time, money and quite a bit of angst.

My aim with this booklet is to help others decide whether a wall is the right solution for their location or property. If it is, I want to provide guidance on what is needed to complete a significant project to protect your home. For us, I can comfortably say it has been a complete game changer.

We went from holding back water at the exterior walls of the house to having a layer of dry land between the house and the wall. It wasn’t cheap, but I consider it an investment that has added to the value and resale potential to our property. It protects the structure of the house in the long term and makes our lives more manageable during a flood.

As with most projects, there is a lot to consider: from obtaining consents, to design, project management, and the construction of the wall.

I hope this guide proves useful for those with little or no construction experience.

Nick Lupton

Contents of the case study

SECTION 1 – The story so far… 4

  • A brief history of Pixham House 5
  • Existing flood mitigation measures 7

SECTION 2 – What we need is a wall! 11

  • Why a flood wall? 12 How do we start? 14
  • Permissions and consents 15

SECTION 3 – Designing the wall 16

  • Level survey 17
  • Structural Engineer 18
  • Detailed Design 19
  • Stepoc blocks 20
  • Demountable Flood Barriers 22
  • Pumps, the removal of groundwater 23
  • Services that will go under the wall 25
  • Further Considerations 26
  • Project Management 28
  • Buying materials / Procurement 29

SECTION 4 – Building the wall 30

  • And finally – Starting the physical work 31
  • Digging the Foundations 31
  • Steelwork and Rebar construction 32
  • Stability of the foundation walls 35
  • Pouring the concrete 35
  • Blockwork 37
  • The final concrete pour to form the wall 39
  • Barrier installation 41
  • Installing the drains and sumps 43

SECTION 5 – Has the wall worked? 45

  • What lessons have we learnt? 47

BBC Coverage of the event

Bob Evans, Retaining wall cost
Author:
Bob Evans
Job Title:
Founder
Company:
Retaining Wall Solutions
Last updated:
September 7, 2024, 2:52 pm

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