Retaining wall type

Aquacast retaining walls

About aquacast retaining walls

Aquacast was originally designed for river bank erosion protection and flood defence walls but can also be used for retaining walls. The blocks are constructed using a fibre-reinforced concrete cast in a W shape. The design gives the aquacast block lots of flexibility.

Aquacast blocks can be used for domestic garden walls and flood defence as well as commercial use.

The slot design within the block provides structural holes for a piling option. Aquacast blocks are very useful for rapid construction applications including, landslides, support walls for subsided road embankments and support for collapsed sea defence walls.

Aquablock design

The W shaped Aquablock is 800mm long, 400mm wide and 125mm deep. Each block weighs 85kg and can be lifted using a small lifting grab. They are made from fibre-reinforced concrete to give them high strength and durability.

The blocks are designed so they can be placed one on top of each other and bonded or opposite each other forming a pocket for reinforcement. The block can be laid at ninety degrees from each other to form a zig-zag pattern. Watch the video to see how they can be put together.

Aquacast Methods of Use

Aquacast blocks can be used for:

  • Garden retaining walls
  • Home flood defence walls
  • Commercial asset flood defence walls
  • River bank erosion protection
  • Traffic security barriers

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Aquacast retaining wall design guide

Height (mm) 500 1000 1500 2000 2500 3000
Blocks per m run 5 15 25 40 55 75
Wall Width (mm) 400 800 800 1200 1200 1600
Base Width (mm) 900 1300 1500 1900 2200 2600
Base Depth (mm) 150 200 200 200 200 250
Base Top Steel A393 A393 A393 A393
Base Bottom Steel A393 A393
Surcharge 10kn/m² 10kn/m² 10kn/m² 10kn/m² 10kn/m² 10kn/m²
Factor of Safety M=1.5 M=1.5 M=1.5 M=1.5 M=1.5 M=1.5
Sketch W-Block-Table-sketch 1 W-Block-Table-sketch 2 w-block-table-sketch 3 W-Block-Table- sketch 4 W-Block-Table- sketch 5 Aquacast Retaining Walls sketch 6

The design table above shows indicative designs for aquacast retaining walls based upon a base material with allowable bearing pressure of >200kPa.

The design uses well-graded, granular backfill with the back of the wall having drainage to relieve hydrostatic pressure.

All indicative information presented in this table is based upon assumed loading and ground conditions. This table is for guidance purposes only and may be subject to change following a detailed, site-specific design developed by an approved structural engineer.


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    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.

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    Aquacast retaining wall and river bank erosion protection 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

    FAQs about aquacast retaining walls

    What is a aquacast retaining wall

    Aquacast retaining wall are made from a w shaped concrete slab 125mm thick. The slabs are 800mm long x 400mm wide. The blocks are laid on top of each other to create the wall. The design principle is gravity. A tube can be inserted between the blocks to add some stability and keep the wall straight during construction.

    How much does a Aquacast retaining wall cost?

    The cost to build a aquacast 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.

    What can you use an aquacast wall for?

    Aquacast where designed to project river banks from erosion, and to act a flood defence walls.

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