Flood defence walls
About flood defence retaining walls
With the planet warming up and the risk of heavy rain or flash flooding ever more prevalent, the need to protect our assets has never been higher. To this end, we have developed a range of fast construction concrete interlocking block flood defence walls.
Most flood defence walls are less than 2m. We have designed four simple walls with heights of 600mm, 800mm, 1200mm, 1600mm
We have also designed 3 membrane flood defence walls 900mm, 1500mm and 2100mm.
The membrane walls are constructed from two 300mm concrete interlocking block walls with a waterproof membrane.
We can help you design your flood defence retaining wall if required, just click here to ask a question.
Simple interlocking block flood defence walls
Most simple flood defence walls use a concrete interlocking block with enough mass to act as a gravity flood defence wall.
Foundation design will depend on the topographical and site investigation information.
The joints of the blocks need to be sealed to stop water leakage through them. There are many products on the market to do this effectively.
At the top of the wall, you can use flat top blocks to improve the finish.
The wall can be built by a local contractor from the design drawings. We highly recommend getting a structural engineer to design the wall first. This is a service we can provide, click here for an initial quote.
Gallery of flood defence walls
Compare prices of retaining wall types
Which retaining wall type is the most economical to build? We have written a free guide on retaining wall price comparisons. The guide details the different types of retaining walls and gives you a price estimate of each type to compare.Retaining wall price comparison guide
Retaining wall design service
The design of a retaining wall requires knowledge of the retaining material, the water table, the ground bearing capacity and any site constraints. The design requires a ground investigation and a structural engineer to ensure the design is fit for purpose.
We offer a full design service from carrying out the ground investigation to final working drawings.Learn about our retaining wall design service
Other types of walls
FAQs about flood defence walls
A flood defence wall is what it say, it keeps flood water back to stop water flooding into properties. We have a number of solutions using the retaining wall types on this website. One of the best solutions is the hollow block (stepoc) retaining wall. This works well because the concrete fill to the core stops water leakage from the block joints. We have a case story for this solution. Go to case stories and you will find it.
The cost to build a flood retaining wall changes with the height of the wall, scale of project, location of the project and any site constraints.
We do have a comprehensive price table and budget calculator in our price guide. The price guide costs change over time so we keep it in one document.
You can download the document from this link. Get the price guide.
Water seeping underneath the retaining wall all depends on the permeability of the soil. For example a clay soil has low permeability and water will probable be unable to seep underneath the wall. However and sand or gravel soil will have a high permeability and water may eventually seep under the wall. Flood tend to go as quickly as they come. Slow seepage should not be a big issue but should be a consideration during the design process.