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A field study to evaluate the runoff quantity and stormwater retention of a typical extensive green roof in Bahçeköy, Istanbul

Ekşi M.

Environment Protection Engineering

2013

Vol. 39, nr 4

79--89

mpervious surfaces in urban areas are increasing as a result of urbanization and development. Roof surfaces constitute a large portion of impervious cover in cities. Within the scope of the sustainability principle and urban policies in the world, water retention benefits of the green roofs to the urban environment have been assessed with various academic studies. In recent years, green roof systems are being used to reduce stormwater runoff in urban areas. In the research, main aim was to determine the rainfall-runoff relationship of a typical extensive green roof with 50 mm thick substrate and to perform comparisons with an unvegetated roof based on field measurements. Hydrological performance of green roofs such as water retention and runoff delay were investigated in local climate of Bahcekoy, Istanbul. Through comparative field measurements at Istanbul University Faculty of Forestry Landscape Architecture Department, Green Roof Research Station (IUGRRS), stormwater retention performance of green roofs was investigated in terms of sustainability. From the derived data, moisture changes in the substrate, outdoor environment interactions and the runoff characteristics of the green roofs were evaluated. According to rainfall characteristics, a typical extensive green roof system delayed the runoff between 1 to 23 h in several rain events and prevented the runoff between 12.8% and 100%. Overall, green roof systems may provide an alternative and sustainable solution for the impervious roof surfaces in cities.

Retencja wód opadowych na dachach zielonych w warunkach wrocławskich

Burszta-Adamiak E.

Gaz, Woda i Technika Sanitarna

2010

Nr 3

21-24

Naturalnie porośnięte tereny takie jak lasy, łąki umożliwiają przechwytywanie wód opadowych i swobodną ich infiltrację do gleby. Wzrost powierzchni nieprzepuszczalnych, widoczny szczególnie na terenach zurbanizowanych, zmienia reżim odpływu w czasie opadów deszczu i roztopów, zamieniając spowolniony spływ na szybki odpływ wód w krótkim czasie. Jednym ze sposobów ograniczania tego niekorzystnego zjawiska jest stosowanie dachów zielonych. W pracy przedstawiono wyniki badań prowadzonych na modelach dachów zielonych na Uniwersytecie Przyrodniczym we Wrocławiu. W artykule dokonano oceny możliwości retencyjnych zielonych dachów oraz ich wpływu na szybkość spływu wód deszczowych z powierzchni dachów.

Natural landscapes like forests and grasslands trap rainwater and allow them to filter into the ground slowly. Growth of impervious surfaces, visible especially in urban areas, changing the regime of runoff during rain and melting snow, turning the slow runoff water to drain away quickly in a short time. One way to reduce this negative phenomenon is the use of green roofs. The paper presents the research results conducted on models of green roofs at the Wrocław University of Environmental and Life Sciences. This article describes the stormwater retention potential of green roofs and their impact on the rate of stormwater runoff from roofs.