Decentral solutions for any rainwater management issue

Projects are often put in the market integrally, whereby the engineer, as part of consortia with contractors, to an increasing extent is challenged to come with conceptual and innovative solutions for construction- and infrastructure projects. In this context important points of departure are: sustainability, climate adaptation and circularity.

“Because of urbanization and climate change the demand for effective rainwater solutions is growing“

Smart decentral solutions

For this purpose Hydrorock offers the decentral solutions to prevent flooding of streets, public spaces, of industrial sites, in green areas and of unmetalled areas. More and more the retention of rainwater ‘on own territory’ plays an important role; either through disconnection from the rainwater drainages or through the buffering and infiltration of rainwater to prevent desiccation.

Hydrorock helps engineering firms with smart decentral solutions in which they efficiently and sustainably use as many ecologically responsible materials as possible including a sophisticated installation method. By positioning the Hydrorock facilities decentrally across the entire area a very gradual and controlled release to the soil takes place. Thus also the amount of spadework is much more limited in comparison with (stand-alone) central solutions.

Innovative and ecologically responsible solutions with Hydrorock

Dutch engineering firms belong to the largest and most specialized firms in the world in the field of water management. This has mainly to do with the frequent rains, the soggy underground and the continuous battle against flooding danger in the Dutch delta. More and more engineering firms offer their added value in the field of rainwater management by an integral plan of approach which focusses on both the technical solution and on the demand for sustainable and decentral solutions. On this website Hydrorock helps the engineering firm with information and if so desired also with tailor-made advice.


View the documents available for the products that are tailored to engineering firms.

Brochure for House and garden
Brochure for Public space
Brochure for Conservation and agriculture
Brochure for Golf courses
Type D Rainwater drainage & buffering
Type D-HD Rainwater drainage & buffering in High Density
Type BD Hemelwater afkoppel & infiltratiesysteem
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

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?

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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 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 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.

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