Flood defence


Flood defence solutions to project water works

We had an enquiry recently to protect a waterworks plant from flooding. The waterworks had been built on a flood plain. The site was sloping so we worked out the flood risk flooding height and designed a wall to protect the plant. The general arrangement of the design is shown on the image above.

We used our standard wall type. the wall heights ranged from 900mm to 2100 mm. The image shown on the page is the 2100 mm wall.

The wall is constructed using two skins of 300mm concrete interlocking blocks with a waterproof membrane in between to stop water from passing through the joints. The wall is then capped off using a 600mm wide x 300mm deep coping. The coping ties the wall together at the top.

The wall is built on a concrete foundation. The outer skin of wall is dowelled into the foundation to give stability during flooding.

Floodplain map

To find out the risk of your building assets you can go to the floodplain map the environmental agency has developed. The link to the site is Floodplain Map. From this page read the content and then click on the map. You can zoom in to your location or locations and see if your building assets are at risk. This is the first step of an assessment. If you are at risk the next step is to work out how high the flood water could rise. You can then design a flood defence system to protect your building assets in the case of flooding is your area.

Retaining wall design and price guide

We have a free design and price guide to support contractors and engineers with different types of retaining wall types and designs. Click on the link below and download your copy. It’s essential reading and may give you some ideas for your next project.

Download the design and price guide

Click here to learn more about flood defence walls.