Permeable paving

Engineered, integrated system

Engineered channel profile, purpose-designed to fit over the Hydrorock range of D blocks

Totally configurable

Solution can be configured to suit site requirements or in-ground problems

Expandable capacity

Touching blocks form a unitary aquifer, so simply add additional blocks to add capacity

Aesthetic solution

Slimline flush fitting channel profile with minimal visual interruption

Permeable paving
94% absorption by volume
Discreet, aesthetic channels
High load bearing options

The Hydrorock natural aquifer block integrated channel drain is an ideal linear solution to enhance the drainage, buffering and infiltration performance of paved areas (permeable or other paving types).

  • Engineered channel profile, purpose-designed to fit over the Hydrorock range of natural aquifer D blocks
  • Surface water drains through channel and is immediately buffered by the blocks below
  • Further Hydrorock blocks can be simply added to increase capacity
  • Where blocks touch, water passes between and capacity increases
  • Blocks can easily be configured to suit all siterequirements
  • Configurability allows for in-ground problems to be dealt with as they are discovered without costly delays
  • Uniquely high absorption to volume ratio (94%)
  • 100% natural product
  • Recyclable
  • Non-plastic solution, no micro particle release
  • Requires minimal excavation
  • Full integratable with other Hydrorock infiltration, attenuation or filter drain systems
  • Excellent load bearing up to 40 tonnes
  • Life time system integrity

Design detailing

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Installation is very simple and quick with minimal disruption.
Blocks are pre-wrapped with filter membrane, so the excavation needs to be only as large as the system (no access is required to fit the membrane).

  • 300mm wide linear channel units fit snugly over Hydrorock natural aquifer blocks
  • No specialist installation engineering or equipment is needed, with simple push or snap-together fittings which require no special skills or tools
  • Hydrorock natural aquifer blocks are used in a single or multiple layers, on a 100 mm layer of sand. This increases the surface area of the bottom of the system
  • Blocks can be placed directly below the channel system, or, for greater capacity, additional blocks can be butted up adjacent to and touching the main configuration
  • Hydrorock BD blocks have integrated perforated pipes allowing rapid inflow and storage water in each block underground.
  • Additional capacity can be rapidly and easily achieved by the addition of further Hydrorock BD blocks or Hydrorock B blocks (pre-wrapped but without integrated pipes)
  • The system can be placed around existing infrastructure, such as pipes and cables unlike crated sumps
  • This flexibility allows for optimisation of the site
  • Placing the system on a 100mm layer of sand will permit infiltration from the module into the surrounding soil and facilitate the discharge of water from the Hydrorock blocks




Click here to use our calculator and quickly calculate the number and volume of Hydrorock natural aquifer blocks needed for your application.


Hydrorock natural aquifer blocks are available to provide 100% sustainable, 100% recyclable water management solutions.

D Block
D Block
BD Block
BD Block
DHD Block
DHD Block
BDHD Block
BDHD Block
BD Block
IR Block
LG Block
LG and SL Blocks
IP Range
IP Range
Filter units
Filter units
Hydrorock fixings and connectors
Hydrorock fixings and connectors