Calculation Examples

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.

In the following example a plot of land with residential units, a total area of 740 m² and 330 m² coverage shall be developed according to the BAF because of alterations in the construction. From the degree of coverage follows a BAF of 0.45. These calculation examples are based on the weighting factors for BFF-landscape plans that were or will be set as a legal regulation after December 2019.

Most of the undeveloped area consists of court or parking space that are sealed or partially sealed. The rainfall drains into the canalization and the effect of the small vegetation is minor.

Through unsealing the parking space new room for more vegetation area becomes available, which has important ecosystem services, increase the wellbeing of the residents and allow rainwater collected from buildings to infiltrate into soil. Beforehand partially sealed surfaces are developed to semi-open or greened surfaces.

For the construction of a playground and a bicycle carport the proportion of semi-open surfaces are increased and vegetation area is reduced. Nevertheless, to still reach the targeted BAF, the roofs and walls of the outbuildings are greened. In addition, one building gets an intensive roof greening for the collaborative use of all residents.