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Issue 19 (1) 2020 pp. 31-41

Agnieszka Boas Berg1, Dana Adamcová2, Petra Martínez Barroso2, Markéta Šourková2, Magdalena Daria Vaverková2

1 Shada BV, the Netherlands
2
Faculty of AgriSciences, Mendel University in Brno

The impact of green roofs on the quality of rainwater and operational problems – case study

Keywords: environment, green roof, rainwater, phytotoxicity test, Sinapis alba L.
Abstract:

Shopping centres usually occupy large areas of land development. However, their roofs are rarely used for purposes
related to rainwater management and introduction of active biological surfaces. In Bielsko-Biała, thanks
to the initiative of the originator and architect, an intense green roof was created on the rooftop of a shopping
centre. In addition to the primary role of the roof as a garden that makes the housing estate more attractive, it
also collects some of the rainwater and delays its outflow to the sewage system. Plants, shrubs and trees planted
on the roof are watered almost exclusively with water collected in a tank located under the building, intended for
retaining rainwater. These waters are pretreated before they reach the tank, i.e. they filter through the root layer
of plants growing on the roof, and through the biologically active layer (substrate). This paper highlights some
of the operating problems of the selected green roof. The authors focused on assessing the toxicity of rainwater
flowing down from hardened surfaces on the roof of the shopping centre and the area occupied by the green
roof. Relevant toxicity studies on these waters have been carried out in this regard. The research hypothesis that
rainwater percolating through the selected soil material is not toxic and stimulates test plant growth was put forward.
Tests of semichronic toxicity with the seeds of white mustard (Sinapis alba L.) prove that all the rainwater
samples showed a stimulating effect on the test plant. The average root growth stimulation value during the
period considered was –125%. It was confirmed that rainwater did not show toxic properties for white mustard
seeds (Sinapis alba L.) and can be used for watering the garden constituting the green roof of a selected research
facility. In the case of rainwater pH, it was found that the pH is adequate and has no toxic effect on the selected
white mustard test plant (Sinapis alba L.). It confirms that the rainwater retained in this way can be used to water
the green roof. The selected research facility meets the requirements set for green roofs.

pub/19_1_31.pdf Full text available in Adobe Acrobat format:
http://www.architectura.actapol.net/volume19/issue1/19_1_31.pdf

For citation:

MLA Berg, Agnieszka Boas, et al. "The impact of green roofs on the quality of rainwater and operational problems – case study." Acta Sci.Pol. Architectura 19.1 (2020): 31-41.
APA Berg, A.B. et al. (2020). The impact of green roofs on the quality of rainwater and operational problems – case study. Acta Sci.Pol. Architectura, 19 (1), 31-41
ISO 690 Berg, Agnieszka Boas, et al. The impact of green roofs on the quality of rainwater and operational problems – case study. Acta Sci.Pol. Architectura, 2020, 19.1: 31-41.
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Streszczenie w języku polskim:
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