Ecologically responsible drainage

Hydrorock Type D units can be used to buffer and draining in an environmentally friendly way.

The Hydrorock infiltration units have an intricate fibrous structure facing in one direction. This vertical facing of the fibres stimulates buffering and infiltration when blocks are placed in a standing position. A horizontal direction of the fibres however stimulates drainage. The blocks are to be placed lying down for drainage of rain water. Due Hydrorock’s unique properties, no slope is required for proper drainage.

Drainage with Hydrorock, also applicable for…

  • prevention of flooding or desiccation in rural areas;
  • improving the ecology of the ground: everything grows and thrives better with Hydrorock®;
  • restore the local water balance and a cleaner ‘nutrition’ of groundwater.

Multifunctional Filter cloth

The filter cloth that surrounds the Hydrorock blocks has, besides the aesthetic property, several important functions:

  • The basic version of the membrane (standard version) ensures the same delivery speed to the bottom as a bare block of stone wool.
  • Prevent influx of small particles; ground or dust
  • Fractions on corners and edges are prevented
  • Handling and placing the blocks is easier
  • Growth of roots is prevented
  • Dimensioning of the blocks is more flexible
  • When placing, transporting and processing people do not come into contact with the bare stone wool
  • The filter membrane can be manipulated, so water infiltration can be delayed if desired. The infiltration direction can also be determined by treating the membrane.

Easy installation type D - horizontal

Hydrorock® units are available in slender blocks in various sizes and densities. The enormous buffer capacity and dimensions limit excavation work. Depending on the application, the blocks are placed one behind the other or next to each other and thus optionally form the desired buffer, drainage or infiltration system.

When draining, the blocks must be placed in a horizontal position (lying down). The sticker (this side up) that applies to buffering and infiltration is then precisely on the side. No slope is required. Always suitable for every desired capacity and situation. Digging of narrow channels is sufficient and costs for removing excess soil are limited. In short, flexibility and simplicity.

Our projects

The best way to show the possibilities of Hydrorock is to see the results.

Living on an estate in harmony with nature

Flooding of parking area in Amersfoort solved sustainably

Rainwater infiltration Xiamen public green area, Haicang District China

Dry feet for students at the campus of the Electric Power University in Beijing

Prevention of flooding of streets in Shanghai

The ‘Amsterdam City Archives’ relieves sewer system with Hydrorock infiltration buffers

The Rijksmuseum in Amsterdam chooses for local infiltration system

Easy to install
Immediately ready-to-use
100% environment friendly
Lifelong functioning
100% Dutch

Frequently Asked Questions

Here you will find a selection of frequently asked questions. Your question might be among them!

Cannot find your question?

+31 (0)10 30 20 000

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3125 BK Schiedam

The Netherlands

Where can I find the Hydrorock price overview?

For the most current prices, we advise you to contact your nearest Hydrorock International dealer. Look here for an overview of suppliers of Hydrorock solutions. They will be happy to make a customized offer for you. For prices and online ordering of individual Hydrorock® products you can look at the various web shops.

Is Hydrorock resistant against erosion by plant- and tree roots?

Hydrorock is produced from stone wool, a 100% natural material. It remains underground for decades in optimum condition. Hydrorock is resistant to erosion by plant and tree roots and will continue to function well for years. The cotton-based membrane of filter cloth does not mold or rot. It has a high breaking strength and is resistant to the natural substances in the soil. Stone wool is 100% recyclable. Flora and fauna thrive excellently on Hydrorock.

Can Hydrorock be used with high groundwater levels?

The infiltration blocks must always remain above groundwater level. The blocks would otherwise be filled with groundwater instead of surface water. Therefore, always check the groundwater level before you start construction. Local groundwater monitoring networks or the DINO counter (Data and Information from the Dutch Subsurface) can help you with this. At a high groundwater level, it is possible to work with blocks that have a lower height, such as the types D34 or D112.

How many Hydrorock infiltration blocks do I need?

The number of required Hydrorock® blocks depends on the surface, the groundwater level and the soil type. Use our calculator to calculate how many blocks you need. Our calculator for disconnecting rainwater can be found here. Look here for solutions to prevent flooding

How are the infiltration blocks placed?

Hydrorock blocks have a fine-grained fiber structure in one direction. A horizontal fiber direction promotes a drainage function. A vertical fiber direction promotes an infiltrating function. Due to the load-bearing capacity of the blocks, these must always be positioned in a vertical position for buffering and infiltrating action (the sticker with the text "this side up" is then on top). If bearing capacity is of secondary importance, the blocks can also be used horizontally for drainage purposes of surface and rainwater. For optimum drainage, we recommend placing the blocks one behind the other and in a horizontal position (lying down). You will find the placement instructions in the here.

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