Stormwater infiltration and attenuation
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The direct effects of increasing land sealing are noticeable everywhere. Most noticeable are rising costs for stormwater drainage as well as flood damage. Over the last few years, a process of rethinking has taken place. The old goals of drainage and centralized treatment of stormwater are being revised. The idea of decentralized infiltration, i.e. the infiltration of excess rainwater as far as possible where it occurs, is becoming more and more prevalent and is becoming an essential component of sustainable stormwater management.
If the soil is unsuitable for infiltration, an alternative approach is to retain heavy rainfall in a stormwater retention system. Decentralized infiltration and on-site retention are increasingly being mandated by authorities, particularly in new development areas. Stormwater fees are charged for sealed surfaces. More and more municipalities are now subsidizing desealing measures in existing buildings. With our comprehensive stormwater management packages, we provide you with a unique, all-inclusive service for your new and existing buildings.

Stormwater infiltration
Infiltrate heavy rain where it falls
Instead of laboriously draining rainwater, it is stored and fed into the groundwater. INTEWA offers you complete solutions for infiltration systems and troughs – ideal for sealed surfaces.
- Decentralized relief
- Promote groundwater recharge
- Compact system solutions

Stormwater attenuation
Buffer instead of flooding
If discharge restrictions are in place, controlled retention is mandatory. Rainwater is temporarily stored and discharged into the sewer system at a controlled rate – aboveground as a reservoir or underground to save space.
- Compliance with discharge specifications
- Protection against overload and flooding
- Individually plannable retention volumes
DRAINMAX tunnel
Our core stormwater management product consists of 1.6 m³ capacity, plastic trays that create a hollow volume of any size in the soil. It can be used for infiltration, attenuation or storage of water.
- Truck loading capacity and DIBt® approval
- Best price per m³
- Easy installation
- Only system with flushable bottom
DRAINMAX Tunnels Now Digitally Connected
Thanks to the innovative INTEWA I-CONNECT technology, DRAINMAX systems can now be monitored remotely for the first time. Operators receive precise information on sludge levels and discharge performance at any time via the INTEWA cloud server. Continuous monitoring ensures reliable operation – and pays for itself within a few years.
Project support from A to Z
There are many aspects to consider when planning and implementing a construction project. In a short time you have to make many decisions that affect the entire construction phase. With regard to your rainwater or greywater solution, we will guide you through all phases, from the planning to the execution of your project.