Sponge City Principle

The Sponge City principle serves to prevent excessive heat and provide near-natural rainwater management in cities.

The cooling capacity of soils and vegetation areas is becoming increasingly important as more and more people realize that green spaces sufficiently supplied with water are the natural "refrigerators" of a city. Cooling capacity can be increased by storing rainwater, implementing soil-improvement measures and continuously watering the vegetation. Promoting the Sponge City principle and developing sustainable storage and irrigation systems are therefore key future tasks for climate-adapted cities.

Decoupling effective drainage areas from existing sewage systems has proven to be an effective approach


  • For reducing hydraulic system loads
  • For improving flood protection
  • For reducing the material and hydraulic water pollution caused by rainwater runoff

Ductile iron pipes with VRS®-T joints are ideally suited for use here:

  • Tried-and-tested root-resistant connections
  • Robust ZMU-Austria coating for use in coarse-grained vegetation areas
  • No heavily compacted pipe bedding, which restricts root growth
  • Diffusion-resistant material

Our service

  • On-site support
  • Holistic understanding
  • Assistance in planning

3,100 tons of CO2 savings

by feeding the waste heat into the district heating network

Over 70 years

at the location Hall

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