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Open AccessArticle

Evaluating the Capability of Grass Swale for the Rainfall Runoff Reduction from an Urban Parking Lot, Seoul, Korea

1
Department of Smart City and Construction Engineering, Korea Institute of Civil Engineering and Building Technology, University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
2
Environmental & Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, 83, Goyangdae-ro, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea
3
Urban Water Cycle Research Center, Korea Institute of Safe Drinking Water Research, Anyang si, Gyeonggi-do 14059, Korea
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2018, 15(3), 537; https://doi.org/10.3390/ijerph15030537
Received: 19 January 2018 / Revised: 28 February 2018 / Accepted: 9 March 2018 / Published: 16 March 2018
(This article belongs to the Special Issue Stormwater Management in Urban Areas)
This field study elaborates the role of grass swale in the management of stormwater in an urban parking lot. Grass swale was constructed by using different vegetations and local soil media in the parking lot of Mapu-gu Seoul, Korea. In this study, rainfall runoff was first retained in soil and the vegetation layers of the grass swale, and then infiltrated rainwater was collected with the help of underground perforated pipe, and passed to an underground storage trench. In this way, grass swale detained a large amount of rainwater for a longer period of time and delayed peak discharge. In this field study, various real storm events were monitored and the research results were analyzed to evaluate the performance of grass swale for managing rainfall runoff in an urban area. From the analysis of field experiments, grass swale showed the significant rainfall runoff retention in different rain events. Grass swale markedly reduced total rainfall runoff volume and peak flow during the small storm events of intensity about 30 mm/h. From the analysis, on average rainfall runoff retention from the grass swale was found around 40 to 75% during the various small rain events. From the results, we can say that grass swale is a stormwater mitigation practice which can help avoid flash flooding problems in urban areas. View Full-Text
Keywords: grass swale; runoff; stormwater management; soil moisture; rain events grass swale; runoff; stormwater management; soil moisture; rain events
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Shafique, M.; Kim, R.; Kyung-Ho, K. Evaluating the Capability of Grass Swale for the Rainfall Runoff Reduction from an Urban Parking Lot, Seoul, Korea. Int. J. Environ. Res. Public Health 2018, 15, 537.

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