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

Inter-Event Time Definition Setting Procedure for Urban Drainage Systems

1
Division of Architecture, Civil & Landscape, Jeonbuk Science College, Jeongeupsaro, Jeongeup 580-712, Korea
2
Department of Civil Engineering, Hanbat National University, San 16-1, Duckmyoung-dong, Yuseong-gu, Daejeon 305-719, Korea
3
School of Civil, Environmental and Architectural Engineering, Korea University, Anam-dong Seongbuk-Gu, Seoul 136-713, Korea
4
Department of Civil Engineering, Seoul National University of Science and Technology, 172 Gongreung 2-dong, Nowon-Gu, Seoul 139-743, Korea
5
Department of Civil Engineering, Dongseo University, San 69-1, Churye 2-dong, Sasang-gu, Pusan 617-716, Korea
*
Author to whom correspondence should be addressed.
Received: 10 October 2013 / Revised: 4 November 2013 / Accepted: 16 December 2013 / Published: 27 December 2013
(This article belongs to the Special Issue Flood Estimation and Analysis in a Variable and Changing Environment)
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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. View Full-Text
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 (CC BY 3.0).

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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.

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