Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Estimation of runoff coefficient through impervious covers analysis using long-term outflow simulation

장기유출 모의를 통한 도시유역 불투수율에 따른 유출계수 변화

  • Kim, Young-Ran (Department of Safety and Environment Research, Seoul Institute) ;
  • Hwang, Sung-Hwan (Urban Flood Research Institute, Universe of Seoul)
  • Received : 2014.08.18
  • Accepted : 2014.11.28
  • Published : 2014.12.15
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Abstract

The changes of rainfall pattern and impervious covers have increased disaster risks in urbanized areas. Impervious covers such as roads and building roofs have been dramatically increased. So, it is falling the ability safety of flood defense equipments to exist. Runoff coefficient means ratio of runoff by whole rainfall which is able to directly contribute at surface runoff during rainfall event. The application of accurate runoff coefficients is very important in sewer pipelines design. This study has been performed to estimate runoff characteristics change which are applicable to the process of sewer pipelines design or various public facilities design. It has used the SHER model, a long-term runoff model, to analyze the impact of a rising impervious covers on runoff coefficient change. It thus analyzed the long-term runoff to analyze rainfall basins extraction. Consequently, it was found that impervious surfaces could be a important factor for urban flood control. We could suggest the application of accurate runoff coefficients in accordance to the land Impervious covers. The average increase rates of runoff coefficients increased 0.011 for 1% increase of impervious covers. By having the application of the results, we could improve plans for facilities design.

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References

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