Green roofs in Basel, Switzerland: combining mitigation and adaptation measures

Urban Farm DB summary

Basel mandated green roofs on new and renovated flat roofs via a 2002 amendment to its building law, reinforced in 2010. By 2006 the city had 1,711 extensive and 218 intensive green roofs, with about 100 new roofs covering 80,000 m2 installed each year since; by 2019 Basel had 5.71 m2 of green roof per inhabitant, among the highest per-capita green roof coverage in the world. The roofs are reported to cut stormwater runoff by 17-20% and lower indoor temperatures by up to 5°C.

Only numbers and their conditions are stored, as structured data — never the source's own sentences. Metric and condition names stay in English, as coded.

• 40 %

  roof area greened share(green roofs)

  Design

  region

  Basel

  year

  current estimate

• 5.71 m2_per_capita

  per capita green roof area(green roofs)

  Design

  region

  Basel

  year

  2019

• 17–20 %↓ Decrease

  stormwater runoff reduction(green roofs)

  WaterControl: conventional roof

  region

  Basel

• 5 degC↓ Decrease

  indoor temperature reduction(green roofs)

  ClimateControl: non-greened roof

  region

  Basel

• 1,711 count

  count extensive green roofs(green roofs)

  Design

  region

  Basel

  year

  2006

• 218 count

  count intensive green roofs(green roofs)

  Design

  region

  Basel

  year

  2006

• 100 count_per_year

  new green roofs installed per year(green roofs)

  Design

  region

  Basel

• 80,000 m2_per_year

  area installed per year(green roofs)

  Design

  region

  Basel

Direction of conclusions

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• StormwaterSupports
• BiodiversityInconclusiveWith caveats
• Policy and governanceSupports