Decentral solutions for every rainwater management issue

Because of urbanization and climate change the demand for effective rainwater solutions is growing. In this context important points of departure are: sustainability, climate adaptation and circularity. Municipalities and water boards make joint efforts for integral area-oriented rain- and groundwater management. Hydrorock helps municipalities in these efforts.

“There is a need for sustainable and cost-efficient solutions for the prevention of local flooding of streets and the relief of the sewerage system”

Prevention of flooding

It is the objective of municipalities to prevent the flooding of streets and unmetalled grounds as much as possible. By now in many municipalities it has become policy to stimulate, either subsidized or not, the disconnecting of rainwater drainages from roofs and metalled surfaces. After all this reduces flooding and water drainage, replenishes the groundwater level in a natural way and it relieves the sewerage system. And very topical, in order to prevent desiccation of the soil and the related damage to public green areas there is a need for local water buffering solutions. Therefore municipalities have the task to contribute to the recovery of the ‘lung function’ of the soil: water retention and storage and the improvement of the groundwater level and – quality.

Inspectable, ecologically responsible and deployable at street vent level

Hydrorock offers many disconnection and infiltration solutions that are specifically aimed at disconnecting from the sewerage system of not only individual buildings, entire neighbourhoods, but also streets and squares. Hydrorock specifically supports municipalities in their prevention of flooding of streets and in their combat against desiccation of the soil by using cleanable decentral solutions. Thanks to a smart design and by applying environment friendly materials, the Hydrorock® solutions are always cleanable, sustainable and ecologically responsible. And the infiltration blocks are a welcome addition to the sustainable exploitation of the soil functions. On this website municipalities may find specific information and if so desired also tailor-made advice.
For private customers we have created a separate brochure: Hydroblob, the simple solution for the prevention of flooding of gardens and terraces. For more consumer-oriented information, please check <a href=""></a>


Please check out the available documents for the products that have been attuned to municipalities.

Brochure for Public space
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 Performance Declaration – Hydrorock Products

Frequently Asked Questions

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

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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.

What is the permissible load / carrying capacity?

The permissible load of the standard Hydrorock infiltration blocks type D is 75 kg per m3. For the High Density version type HD, the standard load capacity is 120 kg per m3. For extra heavy loads, there is an XHD variant with a load capacity of 160 kg per m3. The infiltration solutions can be designed for various strengths on these three Hydrorock variants. Depending on the type of stone wool and the soil conditions, the typical installation depths for the various traffic classes are shown here.

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.

What guarantee does Hydrorock International provide on its products?

At the Hydrorock International B.V. products a guarantee period applies for a period of 10 years in which the manufacturer guarantees operation, dimensional stability and functionality. Also keep in mind that the performance of the product in a structure or system is highly dependent on the parameters of such structure or system, such as (but not limited to) local soil conditions, the quality of the installation and other components. All these parameters fall outside the sphere of influence of Hydrorock International B.V. Consequently, Hydrorock International B.V. offer no guarantee regarding the performance of the product.
For a complete overview of all specifications, please refer to our Product Data Sheet with references from Deltares, among others.

Is the Hydrorock International range also available for consumers?

Hydrorock has a special product line for private individuals under the brand name Hydroblob®. There is an extensive dealer network for this range. There is usually a point of sale in your area. View our special Hydroblob website for more information.

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