unique water drainage coefficient
optimization of pipe cross sections
- less water drainage = smaller pipes = reduction of building thickness= optimized space utilization
no stagnant water on the roof
- retention water in the retention layer
- 2 cm drainage layer between roof and retention layer
water retention systems
- reduction in size or omission of space-consuming infiltration-plants
- abandonment of ecologically worthless water drainage delay systems
simplified fulfillment of building requirements
- water protection act
- SN 592 000
reduction of flood risk
- reduced return of water because of evaporation
- massively reduced water delivery to receiving systems
- slower flow of rivers
- less erosion
