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Developing a Formula for Time to Concentration Based on Rainfall Characteristics in the Chatancheon Catchment

  • Crisisonomy
  • Abbr : KRCEM
  • 2018, 14(2), pp.83-90
  • DOI : 10.14251/crisisonomy.2018.14.2.83
  • Publisher : Crisis and Emergency Management: Theory and Praxis
  • Research Area : Social Science > Public Policy > Public Policy in general
  • Received : December 28, 2017
  • Accepted : January 19, 2018
  • Published : February 28, 2018

Dongphil Kim 1 KIM KYOUNG HO 2 Hojin Lee 2

1한국건설기술연구원
2충북대학교

Accredited

ABSTRACT

River management is critical for preventing damage by flooding, which requires an accurate estimation of design flood. Time to concentration (Tc), used for the duration of rainfall, works as an important factor for the analysis of design flood estimation. The methods developed in other countries, such as Kraven(Ⅰ), Kraven(Ⅱ), Kirpich, Rziha equations and SCS Curve method, have been used to estimate Tc in the practice, but they fail to incorporate the hydrological characteristics in Korea. In addition, there is a discrepancy in the estimation of Tc across the methods even if the same catchment characteristics are used. Thus, an alternative method of estimating Tc incorporating the unique characteristics of Korean catchments should be developed to enhance the level of accuracy in design flood estimation. This study estimated Tc based on the observed hydrological data in the Chatancheon catchment in Yeoncheon, and found the effects of catchment characteristics on Tc. This study produces the basic data to develop a better method of estimating Tc by incorporating the catchment characteristics in Korea.

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