Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Characteristics of Road Runoff depending on the Rainfall Intensity

강우강도에 따른 노면유출수의 유출 특성

  • Kim, Seog-Ku (Korea Institute of Construction Technology, Construction Environment Research Department) ;
  • Kim, Young-Im (Korea Institute of Construction Technology, Construction Environment Research Department) ;
  • Yun, Sang-Leen (Korea Institute of Construction Technology, Construction Environment Research Department) ;
  • Lee, Yong-Jae (EcoSum Co. Ltd) ;
  • Kim, Ree-Ho (Korea Institute of Construction Technology, Construction Environment Research Department) ;
  • Kim, Jong-Oh (Department of Civil Engineering, Kangnung National University)
  • 김석구 (한국건설기술연구원 건설환경연구부) ;
  • 김영임 (한국건설기술연구원 건설환경연구부) ;
  • 윤상린 (한국건설기술연구원 건설환경연구부) ;
  • 이용재 ((주)에코썸) ;
  • 김이호 (한국건설기술연구원 건설환경연구부) ;
  • 김종오 (강릉대학교 토목공학과)
  • Received : 2004.07.28
  • Accepted : 2004.08.30
  • Published : 2004.09.30
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Abstract

Growth in population and urbanization has progressively increased the loadings of pollutants from non-point sources as well as point sources. Therefore, it is necessary to manage both point and non-point sources contaminations for protecting water environment and improving water quality. This study investigated the characteristics of pollutant release over a wide range of rainfall intensities as a requisite to control road runoff that accounts for the largest portion of non-point source contamination in urban areas. Samples of runoff rainwater collected from real road surfaces were analyzed for physicochemical parameters such as pH, suspended solids, and heavy metals. A experimental model road ($30cm{\times}30cm$) was also used to evaluate wash-off properties of pollutants deposited on the surface as functions of time and rainfall intensity. Analysis of runoff samples on rain events showed that the pollutant wash-off patterns for heavy metal and suspended solids were similar. This implies that the particles in rainwater adsorb heavy metals. Experiments using the model road made of impervious asphalt demonstrate a strong first flush phenomenon. At high rainfall intensity, approximately 80% of total pollutants were released within 15 min. The pollutant wash-off rates rapidly increase from 9 mm/hr to 12 mm/hr of rainfall intensity and decrease over 12 mm/hr of rainfall intensity.

Keywords

References

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