The environment friendly solution for flooding and water shortage in the garden and public green spaces

Flooding, but definitely also water shortage belong to the most underestimated problems in the gardens. In situations of flooding private persons and companies often are inconvenienced by subsidences of the terrace, of access and exit roads, garden paths. But also algal growth, bare spots in the lawn and even mildew in the house are no strangers. And we have not even mentioned mediocre or bad growth of plants and trees in case of too much or too little water in public green areas. These are issues that are almost daily on the agenda of landscape architects.

“Maximal result with minimal effort; everything grows and blooms better with Hydrorock”

The sustainable system for the landscape architect, the client and the environment

Hydrorock supports landscape architects with the construction and maintenance of terraces, access and exit roads and gardens. The use of Hydrorock is the solution both in times of excessive rainfall as well as in times of prolonged drought. We do so by the efficient disconnection of rainwater discharges, the collection, retention and draining away of rainwater from where it falls. Using Hydrorock prevents flooding by gradually absorbing an excess of water and by releasing it into the surrounding soil.

Flora and fauna thrive excellently on Hydrorock®

Sustainability and environmentally friendly use of materials are increasingly being discussed. Hydrorock infiltration blocks are made of stone wool, a 100% natural material. It is particularly strong and resistant to erosion by plant and tree roots and the ecologically responsible solution for entry and exit, terrace and garden for your clients. Thanks to the disconnection solution and the buffer function of the Hydrorock infiltration blocks, flora and fauna enjoy rainwater longer and water shortage and dehydration of the soil can be prevented as much as possible. In this way we contribute to the satisfaction of your customers in the construction and maintenance of every terrace and garden.


Please check out the documents available for the products that are specifically attuned to landscape architects.

Brochure for House and garden
Type D Rainwater drainage & buffering
Type D-HD Rainwater drainage & buffering in High Density
Type BD Rainwater separation & infiltration
Type BD-HD Rainwater separation & infiltration – High Density
Type D34 Rainwater lineair drainage
Type IP15 RVS Infiltration drain with built in buffer
Product Data Sheet Hydrorock 2019 English
Product Performance Declaration – Hydrorock producten

More information

Do you need specifications texts? Just let us know and we will make them available to you.

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

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

What is the water absorption capacity of the infiltration blocks in terms of time?

The speed with which Hydrorock blocks blocks of water depends on how the water can reach the blocks. If water comes in direct contact with the blocks, the speed at which the blocks absorb the water is approximately 400 liters per m2 per minute. If water reaches the blocks via a porous layer of, for example, sand, then sand has a delaying effect in this case and is then also normative. The absorption capacity / permeation speed of porous sand is approximately 50/60 liters per hour, which means that 50 liters of water on an area of 1 m2 takes 1 hour to sink into this. Absorption of water via the perforated tube in type BD blocks proceeds at a speed of 100 liters per linear meter of tube per minute.

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.

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.

How much maintenance does the Hydrorock system require?

If the blocks are positioned correctly, the system requires no maintenance. Unlike other solutions, running in of soil is not possible in this system. The blocks therefore do not need to be inspected or cleaned. When uncoupling rainwater discharges it must be prevented that dirt blocks the pipes. This is easy to do by placing a foliage and sand catcher. These systems are easy and quick to clean. If there is a wish to still be able to clean the system extra, we advise you to install the uncoupling system in a loop. In this way the system can be sprayed through and therefore easy to clean should there still be some dirt blockage.

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