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http://dx.doi.org/10.11001/jksww.2022.36.4.229

Applicability of Huff Model & ABM Method for Discharge Capacity of Sewer Pipe  

Hyun, Inhwan (Civil and Environmental Engineering, Dankook University)
Jeon, SeungHui (Civil and Environmental Engineering, Dankook University)
Kim, Dooil (Civil and Environmental Engineering, Dankook University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.36, no.4, 2022 , pp. 229-237 More about this Journal
Abstract
The sewer capacity design have been based on the Huff model or the rational equation in South Korea and often failed to determine optimal capacity, resulting in frequent urban flooding or over-sizing. A time distribution of rainfall (i.e., Huff or ABM method) could be used instead of a rainfall hyetograph obtained from statistical analysis of previous rainfalls. In this study, the Huff method and the ABM method, which predict the time distribution of rain intensity, which are widely used to calculate sewage pipe drainage capacity using the SWMM, were compared with the standard rainfall intensity hyetograph of Seoul. If the rainfall duration was 30 minutes to 180 minutes, the rainfall intensity value calculated by the Huff model tended to be less than the rainfall intensity value of the standard rainfall intensity in the initial 5-10 minutes. As a result, more than 10% to 30% of under-design would be made. In addition, the rainfall intensity value calculated by the Huff model from the section excluding the initial 5-10 minutes of rainfall to the rainfall duration was calculated larger than the value using the standard rainfall intensity equation, which would result in an over-design of 10% to 30%. In the case of a relatively long rainfall duration of 360 minutes (6 hours) to 1,440 minutes (24 hours), it showed an lower rainfall intensity of 60 to 90% in the early stages of rainfall, but the problem of under-design had been solved as the rainfall duration time had elapsed. On the other hand, in the alternating block method (ABM) method, it was found that the rainfall intensity at the entire period at each assumed rainfall duration accurately matched the standard rainfall intensity hyetograph of Seoul.
Keywords
Huff model; ABM method; Rainfall pattern; Raufall distribution; Standard rainfall intensity graph;
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