The green roofs for reduction in the load on rainwater drainage in highly urbanised areas

Urban Farm DB summary

This study conducted field tests on model roofs and GIS-based building potential analysis in two districts of Opole, Poland, proposing a methodology to forecast reduction in rainwater drainage load from green roof deployment. Rainfall up to 5 mm/day is completely retained by both intensive and extensive roofs, and about 44% of torrential rainfall is retained. The runoff reduction coefficient is 0.63 for extensive roofs and 0.74 for intensive roofs; installing green roofs on 25% of suitable buildings is estimated to reduce drainage load enough to prevent localized flooding.

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.

• 44 %

  torrential rain retention rate(green roof)

  Water

  region

  Poland (Opole)

• 0.63

  runoff reduction coefficient(extensive green roof)

  Water

  region

  Poland (Opole)

• 0.74↑ Increase

  runoff reduction coefficient(intensive green roof)

  WaterControl: 粗放型(extensive)緑化屋上の0.63

  region

  Poland (Opole)

• 25 %

  green roof coverage for flood prevention threshold(suitable buildings)

  Water

  region

  Poland (Opole)

Direction of conclusions

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• StormwaterSupports