Hydrorock continues to perform for decades without maintenance

The effective lifespan of a buried Hydrorock block is around 30 years, and during that time it requires no maintenance or visual inspection and will carry on working to the same efficiency throughout.

With a gravel soakaway, it is typically only 15 years, during which time its performance will degrade as it clogs up with silt and mud.

With a crated tank, the plastic crates are supporting the void and are in contact with water and pollutants which may cause the plastic to degrade. Regular visual inspection is required and if defects are discovered, the installation has to be excavated to make repairs.

Tree-lined country road with narrow verges - Surrey

A Hydrorock installation doesn’t create a void underground, so there’s no chance of collapse.

The blocks come in two densities to suit different load-bearing requirements. The standard density blocks can support 7 tonnes per m², whereas the high density products, typically used under roads, can bear 45 tonnes per m².

Both types of block have extremely high absorbency and can be used in combination as a single system without having to change the installation design or approach.

On Tilford Street in Surrey, the engineers used standard density blocks in both verges and linked them together into a large volume unitary aquifer using high density blocks stacked three high under the highway.

Hydrorock blocks have excellent underground resilience. They are pre-wrapped in a geotextile membrane which prevents clogging with silt or mud.

Here you can see Hydrorock being dug up after 4 years to make space for a swimming pool. Still in perfect condition, the blocks were re-installed elsewhere and continued to infiltrate roof and surface runoff.

What happens to waste Hydrorock blocks at the end of their useful life?

At the end of their useful life, typically 30 or more years, Hydrorock blocks can be dug up and will be recycled for free by Rockwool, who make the core material.

Their dedicated Rockcycle® service takes back end-of-life materials for recycling. The blocks, minus their outer membrane and plastic channels, can be re-melted in a cupola furnace and spun into new mineral wool products.

The geotextile membrane is already made from recycled materials and, along with any plastic fittings, can be recycled again after use.

We have live projects in the UK where the benefits of Hydrorock are being exploited to provide low maintenance solutions to persistent highway flooding.

If you have a surface water management project requiring a solution with a longer or lower maintenance lifespan, please contact us to see if Hydrorock Solutions can help.

  • Faster

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  • Simpler

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  • Greener

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