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Water 2014, 6(1), 45-58; doi:10.3390/w6010045
Article

Inter-Event Time Definition Setting Procedure for Urban Drainage Systems

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Received: 10 October 2013; in revised form: 4 November 2013 / Accepted: 16 December 2013 / Published: 27 December 2013
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Abstract: Traditional inter-event time definition (IETD) estimate methodologies generally take into account only rainfall characteristics and not drainage basin characteristics. Therefore, they may not succeed in providing an appropriate value of IETD for any sort of application to the design of urban drainage system devices. To overcome this limitation, this study presents a method of IETD determination that considers basin characteristics. The suggested definition of IETD is the time period from the end of a rainfall event to the end of a direct runoff. The suggested method can identify the independent events that are suitable for the statistical analysis of the recorded rainfall. Using the suggested IETD, the IETD of the Joong-Rang drainage system was determined and the area-IETD relation curve was drawn. The resulting regression curve can be used to determinate the IETD of ungauged urban drainage systems, with areas ranging between 40 and 4400 ha. Using the regression curve, the IETDs and time distribution of the design rainfall for four drainage systems in Korea were determined and rainfall-runoff simulations were performed with the Storm Water Management Model (SWMM). The results were compared with those from Huff's method which assumed a six-hour IETD. The peak flow rates obtained by the suggested method were 11%~15% greater than those obtained by Huff’s method. The suggested IETD determination method can identify independent events that are suitable for the statistical analysis of the recorded rainfall aimed at the design of urban drainage system devices.
Keywords: inter-event time definition (IETD); independent rainfall events; urban drainage systems inter-event time definition (IETD); independent rainfall events; urban drainage systems
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Joo, J.; Lee, J.; Kim, J.H.; Jun, H.; Jo, D. Inter-Event Time Definition Setting Procedure for Urban Drainage Systems. Water 2014, 6, 45-58.

AMA Style

Joo J, Lee J, Kim JH, Jun H, Jo D. Inter-Event Time Definition Setting Procedure for Urban Drainage Systems. Water. 2014; 6(1):45-58.

Chicago/Turabian Style

Joo, Jingul; Lee, Jungho; Kim, Joong H.; Jun, Hwandon; Jo, Deokjun. 2014. "Inter-Event Time Definition Setting Procedure for Urban Drainage Systems." Water 6, no. 1: 45-58.


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