This is how stormwater infiltration pays off
With the introduction of the so-called "fee splitting", in many areas your sealed area is now often taxed with more than 1.00 € /m². You can free yourself from this by installing your own infiltration tank. If you combine infiltration with your rainwater storage tank, you also save on pre-filtration. With a roof area of 150 and 1,00 €/ m² sealing fee you save 150,00 €/ year. A typical system pays for itself in less than 4 years.
Even simpler - Even cheaper - Even more sensible
The new two-part plastic underground tank can not only collect rainwater, but can also store it temporarily and then slowly release it back into the groundwater before slowly releasing it back into the groundwater.
This saves sealing fees, relieves the sewer network and ensures a good groundwater level.
Further advantages:
- Flat installation (self-installation possible)
- Incl. filter and shaft
- Free dimensioning calculation by an INTEWA employee
- Shipping costs remain the same, regardless of whether one element or five elements are shipped
- Short amortisation periods
With an example calculation we would like to show you exactly how and why this system can pay off very quickly and easily:
| Roof area house | 100 m² |
| Roof area carport | 20 m² |
| Precipitation data (Aachen, Germany) | approx. 700 mm |
| Infiltration coefficient of the soil | 5E-5 m/s |
| Costs for a Rainwater infiltration basic kit 2.000 liter incl. shipping and incl. VAT | 479,70 € |
| Sealing fee (depending on location) | 1 € / m² |
| Sum of all roof areas x sealed areas | 120 € / year |
This calculation shows that stormwater infiltration with the two-part plastic underground tank has a payback period of 4 years.
System examples for stormwater infiltration
The basic package for stormwater infiltration includes the ET2000-2, a 2000-liter, two-part underground storage tank with the associated material for secure connection and simple cover caps. The PLURAFIT basic element serves as the dome chamber, which can be extended as required with the PLURAFIT shaft extensions and thus adapted to the upper edge of the terrain. There is no height offset between the inlet and the overflow, so that the tank can easily be installed in existing drainage pipes. By drilling appropriate holes, the tank becomes an infiltration reservoir. The geotextile prevents the surrounding soil from penetrating into the tank interior.
Accessories
Unless a rainwater storage tank for garden irrigation with filter basket is already installed upstream, a filter basket is placed in the dome shaft for pre-filtration to keep coarse dirt out of the infiltration tank and enable long and safe infiltration. Dirt that nevertheless enters the infiltration tank over the years can be easily extracted via a dirty water pump. Thus, in contrast to other systems, the tank can be cleaned excellently.
