Wikis > Guidelines for Stockholm Green module (GYF)

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Figure 1. Example of a green roof in Stockholm. The picture shows a biotope roof in Norra Djurgårdsstaden. The areas with gravel are prepared for installation of PV-modules.

Stockholm Green is an open source calculation module used for calculating the biotope area factor according to the Stockholm methodology (Grönytefaktor, GYF). It also calculates subcategories relevant for the biotope area factor. The calculation module was developed within Ecodistr-ICT project and was programmed by SP Technical Research Institute of Sweden.

KPIs (outcome)

• Stockholm Biotope Area Factor (GYF), [-]

• Biodiversity ratio, [-, %]

• Social value ratio, [-, %]

• Climate adaptation ratio, [-, %]

 

The GYF methodology and what it does
The biotope area factor (BAF) was originally developed in the 1990s in Berlin, Germany to increase green space in the city. It has since been further developed at other locations including the city of Stockholm (here referred to as GYF, Grönytefaktor). This module calculates the biotope area factor of a district, i.e. the area portion of a plot of land that serves as a location for plants or assumes other functions for the ecosystem, in relation to the total area of the plot, in accordance with the model developed in Stockholm, Sweden. The methodology, however, can be used in other cities as it is not dependent on site specific conditions related to the origin city. It was developed to illustrate ecosystem services and encourage the strengthening of local ecosystems and creation of climate-adapted courtyards with high social values. Planners, architects and developers received a concrete planning tool adapted to their way of working, which facilitated and inspired planning and design with ecosystem services.

The Stockholm GYF methodology is a more advanced tool compared to the Berlin BAF tool. It includes many more input parameters and investigates multiple aspects of urban green. The input required is more detailed and will take some time to investigate and collect whereas for the Berlin BAF this is a more simple procedure. Stockholm GYF will, however, provide the user with much more information on urban green and ecosystems in the district.
Berlin Green is a separate module which is also available in the Ecodistr-ICT IDSS platform.

Areas of application
The Stockholm GYF promote greenery that serves several functions, e.g. create green spaces for recreation, delay and purification of rainwater, provide shading and contribute to pollination, and for aesthetic purposes. The GYF is measured as a ratio of the eco-effective surface to the total surface of the district. The eco-efficient surface consists of all the green and blue areas within a district designed according to certain set requirements. Blue surfaces refer to facilities connected to an open storm water management, such as ponds, ditches and rain gardens.

The results are presented as a ratio [-] of ecologically effective surface area to the total land area (district), and the targets should be set by the stakeholders. The GYF target value can vary and references to previous relevant studies should be investigated, normally a factor of 0.6 is used. However, any improvement to the existing GYF is important and even a small change will make a difference to ecosystem services in the area.

Interdependence to other modules
This calculation module is not interdependent to other modules.

References and more information

 

List of input data

The input data used in the Stockholm Green calculations are listed below. All input parameters are not required to be filled in with the exception of “Total Land Area of Plot”. However, the more information that is supplied the more accurate the result.

Some input parameters are described as contributing (sub-) factors (CF). These are surfaces within the district. To these additional (supplementary) factors (AF) can be added for individual elements or important functions. These, including integer data, are later recalculated to equivalent (ecologically effective) surfaces. This means that certain features can count towards several aspects multiple times and are therefore more important since they contribute to the calculated GYF for different input areas.

The input parameters also contribute to biodiversity (B), social value (S), and climate adaptation (C).

For more information and detailed description of all input parameters, see references above.

Table 1 Input data for Stockholm Green calculation module

Applicable to district Unit Explanations
Total Land Area of Plot m2 This is the surface area for the district.
Unsupported ground greenery m2 CF. Contribute to B, S and C.
Plant bed (>800 mm) m2 CF. Contribute to B, S and C.
Plant bed (600 – 800 mm) m2 CF. Contribute to B, S and C.
Plant bed (200 – 600 mm) m2 CF. Contribute to B, S and C.
Green roof (>300 mm) m2 CF. Contribute to B, S and C.
Green roof (50 – 300 mm) m2 CF. Contribute to B, S and C.
Greenery on walls m2 CF. Contribute to B, S and C.
Balcony boxes m2 CF. Contribute to B, S and C.
Water surface permanent m2 CF. Contribute to B, S and C.
Open hard surfaces that allow water to get through m2 CF. Contribute to B, S and C.
Gravel and sand m2 CF. Contribute to S and C.
Concrete slabs with joints m2 CF. Contribute to S and C.
Diversity in the field layer m2 AF. Contribute to B.
Natural species selection m2 AF. Contribute to B.
Diversity on thin sedum roofs m2 AF. Contribute to B.
Integrated balcony boxes with climbing plants m2 AF. Contribute to B.
Butterfly restaurants m2 AF. Contribute to B.
General bushes m2 AF. Contribute to B.
Berry bushes m2 AF. Contribute to B.
Large trees AF. Contribute to B. Large trees (trunk >30 cm).
Medium large trees AF. Contribute to B. Medium large trees (trunk 20-30 cm).
Small trees AF. Contribute to B. Small trees (trunk 16-20 cm).
Oaks AF. Contribute to B. Oak trees (Quercus robur).
Fruit trees AF. Contribute to B.
Fauna depots AF. Contribute to B.
Beetle feeders AF. Contribute to B.
Bird feeders AF. Contribute to B.
Biologically accessible permanent water m2 AF. Contribute to B.
Dry areas with plants that temporarily fill with rain water m2 AF. Contribute to B.
Delay of rainwater in ponds m2 AF. Contribute to B.
Delay of rainwater in underground percolation systems m2 AF. Contribute to B.
Runoff from impermeable surfaces to surfaces with plants m2 AF. Contribute to B.
Grass area – games m2 AF. Contribute to S. Grass area usable for ball games and playing.
Gardening areas in yards m2 AF. Contribute to S.
Balconies and terraces prepared for growing m2 AF. Contribute to S.
Shared roof terraces m2 AF. Contribute to S.
Visible green roofs m2 AF. Contribute to S.
Floral arrangements m2 AF. Contribute to S.
Experiential values of bushes m2 AF. Contribute to S.
Berry bushes with edible fruits m2 AF. Contribute to S.
Trees experiential value AF. Contribute to S.
Fruit trees and blooming trees AF. Contribute to S.
Green surrounded m2 AF. Contribute to S. Pergolas, paths surrounded by leaves and other greenery
Bird feeders – experiential value AF. Contribute to S.
Water surfaces m2 AF. Contribute to S.
Biologically accessible water – experimental value m2 AF. Contribute to S.
Fountains, circulations systems, etc. AF. Contribute to S.
Trees leafy shading AF. Contribute to C. Trees with leafy shade over play areas, etc.
Shade from leaf cover m2 AF. Contribute to C. Pergolas, green corridors etc.
Evening out of temp m2 AF. Contribute to C. Green roofs, ground greenery.
Water collection during dry periods m2 AF. Contribute to C.
Collected rainwater for watering – climate impact m2 AF. Contribute to C.
Fountains etc. – cooling effect AF. Contribute to C.

 

Input data can be uploaded via the Dashboard in the Ecodistr-ICT IDSS platform. Please turn to the Dashboard guidelines and the guidelines for the Data Upload module for more information.

Information for programmers

For more information about the Stockholm Green module for programmers, turn to link >>.

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