- Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Department of Land and Water Resources Management, Bratislava, Slovakia (jana.grecnarova@stuba.sk)
Vegetated roofs are valuable solutions for water management improvements in urban areas as they can store and delay rainfall water. Vegetated roofs cannot be considered static systems, whose performances remain constant over time. This study is based on the use of a laboratory-scale experiment. In addition to evaluating the hydrological performance of the vegetated roof substrate after rainfall events, the impact of humus fraction transport as sediment in roof runoff are assessed.
The laboratory experiment simulated a 15-minute rainfall event with different intensities (low, medium and extreme). After each simulated rainfall event, runoff was filtered through a filter paper to capture the fine substrate particles. A total of 27 measurements were taken. The results showed that with increasing rainfall intensity, there was a higher volume of runoff, which led to an increase in the amount of sediment captured in the runoff. The sediment sampling is crucial for an accurate quantitative assessment of erosion processes on vegetated roofs, transport of humus parts of substrate and their environmental impacts.
The composition of the roof substrate plays a key role in the initial performance and sustainability.
Keywords: roof substrate, rainfall, vegetated roof, rainfall simulator
Acknowledgement: VEGA 1/0577/23
How to cite: Grečnárová, J., Danáčová, M., and Tomaščík, M.: The influence of rainfall intensity on runoff and humus content of roof substrate, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-8897, https://doi.org/10.5194/egusphere-egu25-8897, 2025.
