Discharge from sewer system

Local and faster rainwater infiltration for the world of tomorrow.

rainwater buffer and infiltration system prevents the soil from drying out

Underground irrigation system huge water savings and increased yield

Discharge from sewer system

Due to climate change, we are increasingly confronted with heavy precipitation and periods of prolonged drought.

During heavy rainfall, our sewers cannot handle the amount of water, which means that streets and sometimes even homes are flooded. By discharging the rainwater drainage from the sewer you help to prevent this.

And in the event of a drought, it is a shame to drain scarce rainwater, while your greenery can use it well.

Prevent flooding

Urbanization is accompanied by a significant increase in paved areas, which the existing drainage system and sewerage system is not designed for. As a result, the water cannot reach the soil and cannot infiltrate.

Hydrorock makes it possible to infiltrate into the soil by means of disconnecting water that falls on roofs and paving. In this way flooding is prevented in a natural way and the sewerage system is relieved. In addition, the soil is prevented from drying out and the moisture balance of the soil is restored.

Hydrorock significantly reduces the risk of damage from flooding.

Prevent dessication

Due to urbanization and climate change, the soil dries up, resulting in a disturbed moisture balance in the soil.

Hydrorock makes it possible to temporarily store water in the soil and releases this water gradually. In this way, dehydration is prevented in a natural way and the moisture balance in the soil is restored.

Hydrorock significantly reduces the risk of damage from dissection.

Sub-soil irrigation

Hydrorock makes it possible to irrigate water underground. This prevents the evaporation of precious water and nutrients.

With the Hydrorock sub-soil irrigation solution we create a data-driven, fully automatic irrigation system.

Hydrorock makes it possible to temporarily store water in the blocks and gradually releases water through underground irrigation.

This brings and keeps the moisture balance around the root system in optimal condition.

For more information, feel free to contact us about the different options.

This is Hydrorock

The solution for all your flooding, made from the 100% natural stone wool material. Molten rock that is spun into fibers and formed into a block, encased in a membrane of erosion-resistant filter cloth. Lifelong operation and immediately ready for use.

Hydrorock characteristics

Hydrorock has the following unique characteristics:

  • It lasts long due to the protective geotextile membrane
  • Made from 100% natural basalt rock
  • It has an enormous absorbing capacity
  • It is extremely lightweight
  • It holds the water in a unique way
  • It’s immensely strong

A very natural process

100% natural material

Volcanic rock basalt

Molten rock, spun into fibers and formed into blocks

Remains underground in optimum condition for decades

Resistant against erosion by plant- and tree roots

Inflow of soil not possible

Our projects

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

Singaport City Drains

Hydrorock – Subsoil Aquifer Irrigation System

Flooding of parking area in Amersfoort solved sustainably

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

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

Our mission

Hydrorock International wants to contribute sustainably to the preservation and use of clean rainwater in soil utilization. We focus on the prevention of flooding and dehydration in cultivated and non-cultivated areas with ecologically responsible (underground) solutions. Thus Hydrorock® contributes to the sustainable use of soil functions.

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

's-Gravelandseweg 246

3125 BK Schiedam

The Netherlands

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.

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.

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 Hydrorock blocks connected to rainwater discharge or street drain?

The connection to the rainwater drainage is done by connecting the rain pipe to the Hydrorock blocks of type BD. This version has a perforated tube (ø 100mm) that runs through the block so that the water can run into the block. The tube can be connected to rainwater drains, street vents, pipes, drainage hoses, gutters, etc. These blocks can be mutually coupled in the longitudinal direction by means of a small piece of perforated tube. The buffer capacity can be increased by placing a type D block without tube on the side (s) of type BD. The blocks pass the water on to each other.

Where are Hydrorock products available?

Hydrorock International has professional dealers in many countries. We are happy to link you to one of these points of sale. Hydrorock International also has official dealers outside Europe. In China, for example, Hydrorock is used to collect rainwater from highways. In Australia our official dealer sells Hydrorock primarily to prevent drying out. View all our current points of sale here.

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