- Permeable concrete is permeable to water (also described as heavy permeable surface)

- Special material/cement mixture with larger stones that allows water to pass through the concrete into the soil beneath the concrete layer

- Permeable concrete looks similar to standard concrete-> different functionality /construction

- Holes/gaps/voids in the concrete layer enables water infiltration/drainage

- After a storm water event: rainwater soaks through the concrete layer (pores) in contrast to regular concrete where water runs off on the surface and may cause flooding

- A porous medium for example an underground gravel bed, which also filters the water is installed under the permeable concrete layer - Permeable concrete is a hard surface ( roadways/areas with higher traffic)

- Application areas: parking lots, streets, driveways…

Basic information

Type: 
Retrofitting + Creation
Challenge: 

Performance

Evapotranspiration none none
Shading none none
Reflection (Albedo) none
Water Conveyance none
Water Infiltration 1
Water Retention 1
Water Storage none
Water Reuse none
Water Filtering 1
Water Bio-remediation none
Deposition none
Bio-filtration none
Habitat Provision none
Connectivity none
Beauty / Appearance none
Usability / Functionality 1
Social Interaction none
Role of Nature / Mode of Action: 
- Permeable paver are similar to other surfaces
Technical & Design Parameters: 
- Cavity ≥ 15% - Water permeability: kf >10 - ³ m/s - Asperity: at 4m length asperity cannot be more than 1,5 cm - About 100 l/m² per second water passes
Conditions for Implementation: 
- Greater effort ( roads have to be relaid)
Benefits & Limitations: 
Benefits: - Water regulation with space which is used for traffic (no more space is needed) - Can be used to slow traffic and reduce noise - Reduces storm runoff by 70-90 % - Improves water quality (removes 85-95% suspended solids, 65-85% phosphorus, 80-85% nitrogen 30% nitrate, up to 98% metals)

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 730052 Topic: SCC-2-2016-2017: Smart Cities and Communities Nature based solutions