The production costs of the various infiltration variants are as different as the types of systems themselves.
In addition to the costs of the supply systems, such as channels and / or pipes, the calculated size of the infiltration system, which in turn is derived from the local rain data (KOSTRA Atlas of the German Weather Service), the connected impermeable area (Au), the soil permeability (kf value ) and the height of the groundwater level are decisive.
If the production costs for the construction of supply systems are eliminated by the direct introduction of rainwater into the infiltration system, e.g. from traffic areas into adjacent infiltration troughs, then there is already a significant potential for savings compared to the sewer connection, which cannot be realized without cost-intensive underground pipes and manhole structures.
With a view to the pure construction costs, it should be noted that the costs for the production of infiltration systems with above-ground water supply are well below the financial production costs of property drainage systems with sewer connection.
The construction costs for the production of the more expensive underground infiltration systems can, depending on the type of system, exceed the costs for the production of a sewer connection, but experience shows that they are amortized over a period of 6 to 12 years due to the saved rainwater charges.
With the help of the cost data from over 200 successfully implemented projects in the field of sustainable rainwater management, the different infiltration systems can be placed as follows, based on the respective production costs:
Case study:
In order to be able to compare the production costs of the various infiltration systems, the following parameters were used as a basis for the hydraulic dimensioning of all infiltration systems.
The cost basis is based on the unit prices of over 120 successfully completed projects.
Object data:
Expected fees for sewer connection:
Soil properties:
Production costs of the various infiltration systems (according to the case study)
Due to the restrictions on the use of the various infiltration systems resulting from the local conditions, the most cost-effective variant is not always feasible.
Regardless of this, we recommend our clients to check the feasible infiltration possibilities on their own property (to have them checked), there
With reference to a sustainable cost management of the rainwater charges recurring year after year, also considered in the overall context of constantly rising energy costs, rainwater management can open up a sometimes not inconsiderable saving potential in property-related ancillary costs.