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CLIMATE-RESILIENT STORMWATER MANAGEMENT: A PILOT STUDY ON THE RUNOFF MITIGATION EFFECTS OF AN EXTENSIVE GREEN ROOF
Abstract
The retention of rainwater runoff through green roofs provides a number of positive effects in achieving resilient urban infrastructure. The most significant benefits include adaptation to climate changes, such as alternating between intense rainfall and droughts, as well as reduced capital and operational expenditures for sewer systems. The primary objective of this research is to analyze the mitigation effect on the run-off from an extensive green roof in the Sofia (Bulgaria) area for the first time. To accomplish this, half of an existing bitumen roof (400 m2) was upgraded to a green roof. The runoff from both sections was then subjected to comparative analysis. The selection of the green roof was made with the objective of being as light as possible in order to be applicable to existing buildings. The obtained results demonstrate a substantial reduction in the discharged runoff volume to the sewer, reducing the overall stress to the water collection system - a widespread finding in other regions. However, the findings of this study demonstrate that the effect is not uniform, as the green roof possesses a capacity to accumulate water. Once this capacity is exhausted, and the green roof is ponded, the run-off exhibits a behavior that is analogous to that of the bitumen roof. Consequently, the mitigation effect during severe storms should be carefully considered in sewer modelling. The findings will facilitate the engineering design of modern resilient urban water management infrastructure.
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