• Stackable

You can make just about anything from these blocks, try making a weir to flood the first story of a building! Or perhaps a set of steps, capped with our textured square lids.

  • Strong

Keyed together in a brickwork pattern or backed up layers of blocks to reinforce areas under high stress. A six high stack takes over 2 tonnes of force to pull over.

  • Secure

Lockable lids. Security nuts prevent tampering with your blocs.

  • Integrated groynes

Vertical sided courses are the simplest and cheapest to build. However sloping sides have their advantages. So we’ve added a 3:2 angled bloc, which can be used to attach groynes to the side wall.

  • 3D positioning

You can position any height of blocs — anywhere; parallel or perpendicular, or any angle between, along the width and length of your track.

  • Colourful

The blocs can be moulded in a range of colours. Let us know what you want and we’ll try to match it.

  • Reconfigurable

Want to move things around? That’s easy. Although we’re always on hand for course design and setup (with years of experience in flow modelling) if you need us.

  • Low construction cost

The Unistrut used in the channel floor to position the blocs is relatively inexpensive and your construction contractor will already be familiar with it.

Patent Application Number 61/168098
Registered Design 4011933
International Design Classification
LOC (07) Cl. 21–02

  • Product list

Easy to locate and stack, you can make all sorts of things out of these simple shapes. Moulded from HDPE plastic with galvanised bolts and inserts. Available in a range of colours (just ask us).

Standard bloc

  • 1m x 0.5m x 0.25m
  • rotomolded polyethylene
  • galvanised steel frame
  • includes 4x galvanised anchors

Half bloc

  • 0.5m x 0.5m x 0.25m
  • rotomolded polyethylene
  • galvanised steel frame
  • includes 2x galvanised anchors

Rounded lid

  • 1m x 0.5m x 0.08m
  • rotomolded polyethylene
  • rounded smooth edges
  • covers anchor mechnanism

Square lid

  • 0.5m x 0.5m x 0.06m
  • rotomolded polyethylene
  • grip tread pattern
  • covers anchor mechnanism


  • 1m x 0.5m x 0.75m
  • rotomolded polyethylene
  • galvanised steel frame
  • wall attachments included

Safety / wave forming wedge

  • 1m x 0.5m x 0.25m
  • rotomolded polyethylene
  • mount on channel floor or on another bloc
  • upstream for safety / downstream for waves

  • Example setups

Just some of the things you can make with RapidBlocs:

[list icon=“ok-sign”]

  • simulated buildings
  • steps
  • SRT platforms
  • wave formation
  • stopper formation
  • S‑gates
  • [/list]