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Calculation examples

Enlarge photo: Green courtyard at Muskauer Straße 9
Green courtyard at Muskauer Straße 9
Image: SenUVK

Each plot of land can be designed in various ways. In principle, measures that lead to an expansion of the area of vegetation on the ground are given priority. Only then should additional possibilities, such as the replacement of asphalt and concrete with other surfaces, be utilized.

  • Land area

    479 m²

  • Developed area

    279 m²

  • Undeveloped area

    200 m²

  • Degree of development

    0,59

Plan: Calculation example
Plan: Calculation example

The courtyard is mainly covered with asphalt. There is gravel with grass coverage on the periphery, and the tree stands in a soil bed that measures 1 m².

Calculation: BAF Ground state

  • 140 m² Asphalt

    x 0,0 = 0 m²

  • 59 m² gravel with grass coverage

    x 0,5 = 30 m²

  • 1 m² open soil

    x 1,0 = 1 m²

  • BAF: 31/479 = 0,06

  • BAF target = 0.3

Enlarge photo: Traditional courtyard greenery in Wedding
Traditional courtyard greenery in Wedding
Image: SenUVK
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Planning variant 1

  • Land area

    479 m²

  • Developed area

    279 m²

  • Undeveloped area

    200 m²

  • Degree of development

    0,59

Plan: Calculation example - variant 1
Plan: Calculation example - variant 1

Achieving the targeted BAF will require measures that amount to a BAF of 0.24.
By reducing the area covered by asphalt and changing the type of surfacing, as well as by significantly expanding the area covered by vegetation, a BAF of 0.3 can be realized on this plot of land.

Calculation: BAF Variant 1

  • 115 m² area covered by vegetation

    x 1,0 = 115,0 m²

  • 85 m² mosaic paving

    x 0,3 = 25,5 m²

  • BAF: 140,5/479 = 0,3

Street / Land Total area (m²) Developed area (m²) Undeveloped area (m²) Existing-BAF 0.06
Calculation example 479 279 200 BAF 0,3
Surface type / weighting-factor per m² Portion of each surface type relative to the total area in m² Amount EEA* Amount Planned EEA* Planned
Sealed surfaces 0,0 140 0
Partially sealed surfaces 0,3 85 25,5
Semi-open surfaces 0,5 59 30
Surfaces with vegetation unconnected to soil below and with < 80 cm of soil covering 0,5
Surfaces with vegetation unconnected to the soil below and with > 80 cm of soil covering 0,7
Surfaces with vegetation connected to the soil below 1,0 1 1 115 115
Rainwater infiltration per m² of runoff area 0,2
Vertical greenery up to a maximum of 10 m in height 0,5 bis 0,7
Greenery on rooftop 0,5 bis 0,8
Ecologically effective surface area 31 140,5
BAF = ecologically effective surface area : total land area
  • * EEA = Portion of the Ecologically Effective surface Area
BAF = 140,5 : 479 Existing BAF 0,06 Planned BAF 0,3
Enlarge photo: Courtyard garden at Friedelstraße 49
Courtyard garden at Friedelstraße 49
Image: SenUVK
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Planning variant 2

  • Land area

    479 m²

  • Developed area

    279 m²

  • Undeveloped area

    200 m²

  • Degree of development

    0,59

Plan: Calculation example - variant 2
Plan: Calculation example - variant 2

Building a covered bicycle stand means that the portion of partially sealed surfaces must be increased.
It is therefore necessary to utilize roof and fire wall surfaces in order to achieve the required BAF.

Calculation: BAF Variant 2

  • 21 m² concrete surface

    x 0,0 = 0,0 m²

  • 79 m² area covered by vegetation

    x 1,0 = 79,0 m²

  • 100 m² mosaic paving

    x 0,3 = 30,0 m²

  • 10 m² greenery
    covering walls

    x 0,5 = 5,0 m²

  • 41 m² reenery covering rooftop

    x 0,7 = 29,0 m²

  • BAF: 143/479 = 0,3

Street / Land Total area (m²) Developed area (m²) Undeveloped area (m²) Existing-BAF 0.06
Calculation example 479 279 200 BAF 0,3
Surface type / weighting-factor per m² Portion of each surface type relative to the total area in m² Amount EEA* Amount Planned EEA* Planned
Sealed surfaces 0,0 140 0 21 0
Partially sealed surfaces 0,3 100 30
Semi-open surfaces 0,5 59 30
Surfaces with vegetation unconnected to soil below and with < 80 cm of soil covering 0,5
Surfaces with vegetation unconnected to the soil below and with > 80 cm of soil covering 0,7
Surfaces with vegetation connected to the soil below 1,0 1 1 79 79
Rainwater infiltration per m² of runoff area 0,2
Vertical greenery up to a maximum of 10 m in height 0,5 10 5
Greenery on rooftop 0,7 41 29
Ecologically effective surface area 31 143
BAF = ecologically effective surface area : total land area
  • * EEA = Portion of the Ecologically Effective surface Area
BAF = 140,5 : 479 Existing BAF 0,06 Planned BAF 0,3
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Enlarge photo: Courtyard in Schlüterstraße 12
Courtyard in Schlüterstraße 12
Image: SenUVK