Green volume number

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Green volume number ( GVZ for short ) is a term from landscape planning and describes the product of the area covered by vegetation (e.g. the area of ​​a forest) and the height of the vegetation.

In 1984 the Hamburg environmental authority published “Expertise - Values ​​for Landscape and Urban Development Planning” for the first time the possibilities for establishing a so-called soil function number and green volume number were examined with the aim of establishing these as norms in spatial planning.

relevance

The number of green spaces is relevant as a guideline for setting urban climatic quality goals with regard to air humidity , as this is not only influenced by the climate factor sealing (determined by the degree of sealing ), but also by vegetation. The decisive factor here is not the area of ​​the vegetation, but its surface, as it regulates the amount of moisture-increasing evapotranspiration . The green volume number is an attempt to include the vegetation surface, which is otherwise difficult to determine, as a measure of the planning.

Examples

  • A wooded area with a floor area of ​​100 m² and a total height of 8 m has a green volume of 800 m³
  • A meadow with a floor area of ​​100 m² and a total height of 0.10 m has a green volume of 10 m³

literature

  • M. Großmann, W. Pohl, HD Schulze: Green volume number and soil function number in landscape and urban development planning , publications of the authority for district affairs, nature conservation and environmental design, volume 9, Hamburg, 1983